Fix extra closing brace in CreateDiscHandler

Remove duplicate closing brace at end of CreateDiscHandler.java
  that was causing a syntax error.

src/main/java/com/mediamanager/mapper/DiscMapper.java

@@ -0,0 +1,50 @@
+package com.mediamanager.mapper;
+
+import com.mediamanager.model.Disc;
+import com.mediamanager.protocol.messages.DiscMessages;
+
+public class DiscMapper {
+    public static DiscMessages.Disc toProtobuf(Disc entity) {
+        if (entity == null) {
+            return null;
+        }
+
+        Integer discNumber = entity.getDiscNumber();
+        if (discNumber == null) {
+            throw new IllegalArgumentException("Disc number cannot be null");
+        }
+
+        DiscMessages.Disc.Builder builder = DiscMessages.Disc.newBuilder()
+                .setDiscNumber(discNumber);
+
+        Integer id = entity.getId();
+        if (id != null) {
+            builder.setId(id);
+        }
+
+        // Map Album foreign key
+        if (entity.getAlbum() != null && entity.getAlbum().getId() != null) {
+            builder.setFkAlbumId(entity.getAlbum().getId());
+        }
+
+        return builder.build();
+    }
+
+    public static Disc toEntity(DiscMessages.Disc protobuf) {
+        if (protobuf == null) {
+            return null;
+        }
+
+        Disc entity = new Disc();
+
+        if (protobuf.getId() > 0) {
+            entity.setId(protobuf.getId());
+        }
+
+        entity.setDiscNumber(protobuf.getDiscNumber());
+
+        // Note: Foreign key relationship (Album) is handled in the service layer
+
+        return entity;
+    }
+}

src/main/java/com/mediamanager/mapper/TrackMapper.java

@@ -0,0 +1,95 @@
+package com.mediamanager.mapper;
+
+import com.mediamanager.model.Track;
+import com.mediamanager.protocol.messages.TrackMessages;
+
+public class TrackMapper {
+    public static TrackMessages.Track toProtobuf(Track entity) {
+        if (entity == null) {
+            return null;
+        }
+
+        Integer trackNumber = entity.getTrackNumber();
+        if (trackNumber == null) {
+            throw new IllegalArgumentException("Track number cannot be null");
+        }
+
+        String title = entity.getTitle();
+        if (title == null) {
+            throw new IllegalArgumentException("Title cannot be null");
+        }
+
+        String filepath = entity.getFilepath();
+        if (filepath == null) {
+            throw new IllegalArgumentException("Filepath cannot be null");
+        }
+
+        TrackMessages.Track.Builder builder = TrackMessages.Track.newBuilder()
+                .setTrackNumber(trackNumber)
+                .setTitle(title)
+                .setFilepath(filepath);
+
+        Integer id = entity.getId();
+        if (id != null) {
+            builder.setId(id);
+        }
+
+        // Map duration (optional)
+        Integer duration = entity.getDuration();
+        if (duration != null) {
+            builder.setDuration(duration);
+        }
+
+        // Map Disc foreign key (required)
+        if (entity.getDisc() != null && entity.getDisc().getId() != null) {
+            builder.setFkDiscId(entity.getDisc().getId());
+        }
+
+        // Map Composer foreign key (optional)
+        if (entity.getComposer() != null && entity.getComposer().getId() != null) {
+            builder.setFkComposerId(entity.getComposer().getId());
+        }
+
+        // Map BitDepth foreign key (optional)
+        if (entity.getBitDepth() != null && entity.getBitDepth().getId() != null) {
+            builder.setFkBitdepthId(entity.getBitDepth().getId());
+        }
+
+        // Map BitRate foreign key (optional)
+        if (entity.getBitRate() != null && entity.getBitRate().getId() != null) {
+            builder.setFkBitrateId(entity.getBitRate().getId());
+        }
+
+        // Map SamplingRate foreign key (optional)
+        if (entity.getSamplingRate() != null && entity.getSamplingRate().getId() != null) {
+            builder.setFkSamplingrateId(entity.getSamplingRate().getId());
+        }
+
+        return builder.build();
+    }
+
+    public static Track toEntity(TrackMessages.Track protobuf) {
+        if (protobuf == null) {
+            return null;
+        }
+
+        Track entity = new Track();
+
+        if (protobuf.getId() > 0) {
+            entity.setId(protobuf.getId());
+        }
+
+        entity.setTrackNumber(protobuf.getTrackNumber());
+        entity.setTitle(protobuf.getTitle());
+        entity.setFilepath(protobuf.getFilepath());
+
+        if (protobuf.getDuration() > 0) {
+            entity.setDuration(protobuf.getDuration());
+        }
+
+        // Note: Foreign key relationships (Disc, Composer, BitDepth, BitRate, SamplingRate)
+        // are handled in the service layer
+
+        return entity;
+    }
+}

src/main/java/com/mediamanager/model/Album.java

@@ -98,9 +98,14 @@ public class Album {
     }
 
     public void removeGenre(Genre genre) {
-        ag.getGenre() != null && 
-            ag.getGenre().getId() != null && 
-            ag.getGenre().getId().equals(genre.getId())
+        if (genre == null) {
+            return;
+        }
+        albumGenres.removeIf(ag ->
+                ag.getGenre() != null &&
+                        ag.getGenre().getId() != null &&
+                        ag.getGenre().getId().equals(genre.getId())
+        );
     }
 
     // Método conveniente para pegar só os gêneros

src/main/java/com/mediamanager/model/Disc.java

@@ -0,0 +1,47 @@
+package com.mediamanager.model;
+
+import jakarta.persistence.*;
+
+@Entity
+@Table(name = "disc")
+public class Disc {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Integer id;
+
+    @Column(name = "disc_number", nullable = false)
+    private Integer discNumber;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "fk_album_id",nullable = false)
+    private Album album;
+
+    public Disc() {
+
+    }
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public Integer getDiscNumber() {
+        return discNumber;
+    }
+
+    public void setDiscNumber(Integer discNumber) {
+        this.discNumber = discNumber;
+    }
+
+    public Album getAlbum() {
+        return album;
+    }
+
+    public void setAlbum(Album album) {
+        this.album = album;
+    }
+}

src/main/java/com/mediamanager/model/Track.java

@@ -0,0 +1,128 @@
+package com.mediamanager.model;
+
+import jakarta.persistence.*;
+
+@Entity
+@Table(name = "track")
+public class Track {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Integer id;
+
+    @Column(name = "track_number")
+    private Integer trackNumber;
+
+    @Column
+    private String title;
+
+    @Column
+    private Integer duration;
+
+    @Column
+    private String filepath;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "fk_disc_id")
+    private Disc disc;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "fk_composer_id")
+    private Composer composer;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "fk_bit_depth_id")
+    private BitDepth bitDepth;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "fk_bit_rate_id")
+    private BitRate bitRate;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "fk_sampling_rate_id")
+    private SamplingRate samplingRate;
+
+    public Track() {
+
+    }
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public Integer getTrackNumber() {
+        return trackNumber;
+    }
+
+    public void setTrackNumber(Integer trackNumber) {
+        this.trackNumber = trackNumber;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String name) {
+        this.title = name;
+    }
+
+    public Integer getDuration() {
+        return duration;
+    }
+
+    public void setDuration(Integer duration) {
+        this.duration = duration;
+    }
+
+    public String getFilepath() {
+        return filepath;
+    }
+
+    public void setFilepath(String filepath) {
+        this.filepath = filepath;
+    }
+
+    public Disc getDisc() {
+        return disc;
+    }
+
+    public void setDisc(Disc disc) {
+        this.disc = disc;
+    }
+
+    public Composer getComposer() {
+        return composer;
+    }
+
+    public void setComposer(Composer composer) {
+        this.composer = composer;
+    }
+
+    public BitDepth getBitDepth() {
+        return bitDepth;
+    }
+
+    public void setBitDepth(BitDepth bitDepth) {
+        this.bitDepth = bitDepth;
+    }
+
+    public BitRate getBitRate() {
+        return bitRate;
+    }
+
+    public void setBitRate(BitRate bitRate) {
+        this.bitRate = bitRate;
+    }
+
+    public SamplingRate getSamplingRate() {
+        return samplingRate;
+    }
+
+    public void setSamplingRate(SamplingRate samplingRate) {
+        this.samplingRate = samplingRate;
+    }
+}

src/main/java/com/mediamanager/repository/DiscRepository.java

@@ -0,0 +1,100 @@
+package com.mediamanager.repository;
+
+import com.mediamanager.model.Disc;
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityManagerFactory;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.util.List;
+import java.util.Optional;
+
+public class DiscRepository {
+    private static final Logger logger = LogManager.getLogger(DiscRepository.class);
+
+    private final EntityManagerFactory entityManagerFactory;
+
+    public DiscRepository(EntityManagerFactory entityManagerFactory) {
+        this.entityManagerFactory = entityManagerFactory;
+    }
+
+    public Disc save(Disc disc) {
+        logger.debug("Saving Disc: {}", disc.getDiscNumber());
+        EntityManager em = entityManagerFactory.createEntityManager();
+        em.getTransaction().begin();
+        try {
+            em.persist(disc);
+            em.getTransaction().commit();
+            logger.debug("Disc has been saved successfully");
+            return disc;
+        } catch (Exception e) {
+            em.getTransaction().rollback();
+            logger.error("Error while saving Disc: {}", e.getMessage());
+            throw e;
+        } finally {
+            if (em.isOpen()) em.close();
+        }
+    }
+
+    public List<Disc> findAll() {
+        logger.debug("Finding All Disc");
+        EntityManager em = entityManagerFactory.createEntityManager();
+        try{
+            return em.createQuery("select d from Disc d", Disc.class).getResultList();
+        }finally {
+            if (em.isOpen()) em.close();
+        }
+    }
+
+    public Optional<Disc> findById(Integer id) {
+        logger.debug("Finding Disc with id: {}", id);
+        EntityManager em = entityManagerFactory.createEntityManager();
+        try{
+            Disc disc = em.find(Disc.class, id);
+            return Optional.ofNullable(disc);
+        }finally {
+            if (em.isOpen()) em.close();
+        }
+    }
+
+    public Disc update(Disc disc) {
+        logger.debug("Updating Disc: {}", disc.getDiscNumber());
+        EntityManager em = entityManagerFactory.createEntityManager();
+        em.getTransaction().begin();
+        try {
+            Disc updated = em.merge(disc);
+            em.getTransaction().commit();
+            logger.debug("Disc has been updated successfully");
+            return updated;
+        } catch (Exception e) {
+            em.getTransaction().rollback();
+            logger.error("Error while updating Disc: {}", e.getMessage());
+            throw e;
+        } finally {
+            if (em.isOpen()) em.close();
+        }
+    }
+
+    public boolean deleteById(Integer id){
+        logger.debug("Deleting Disc with id: {}", id);
+        EntityManager em = entityManagerFactory.createEntityManager();
+        em.getTransaction().begin();
+        try{
+            Disc disc = em.find(Disc.class, id);
+            if (disc == null) {
+                em.getTransaction().rollback();
+                return false;
+            }
+            em.remove(disc);
+            em.getTransaction().commit();
+            logger.debug("Disc has been deleted successfully");
+            return true;
+        } catch (Exception e) {
+            em.getTransaction().rollback();
+            logger.error("Error while deleting Disc: {}", e.getMessage());
+            throw e;
+        } finally {
+            if (em.isOpen()) em.close();
+        }
+    }
+}

src/main/java/com/mediamanager/repository/TrackRepository.java

@@ -0,0 +1,100 @@
+package com.mediamanager.repository;
+
+import com.mediamanager.model.Track;
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityManagerFactory;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.util.List;
+import java.util.Optional;
+
+public class TrackRepository {
+    private static final Logger logger = LogManager.getLogger(TrackRepository.class);
+
+    private final EntityManagerFactory entityManagerFactory;
+
+    public TrackRepository(EntityManagerFactory entityManagerFactory) {
+        this.entityManagerFactory = entityManagerFactory;
+    }
+
+    public Track save(Track track) {
+        logger.debug("Saving Track: {}", track.getTitle());
+        EntityManager em = entityManagerFactory.createEntityManager();
+        em.getTransaction().begin();
+        try {
+            em.persist(track);
+            em.getTransaction().commit();
+            logger.debug("Track has been saved successfully");
+            return track;
+        } catch (Exception e) {
+            em.getTransaction().rollback();
+            logger.error("Error while saving Track: {}", e.getMessage());
+            throw e;
+        } finally {
+            if (em.isOpen()) em.close();
+        }
+    }
+
+    public List<Track> findAll() {
+        logger.debug("Finding All Track");
+        EntityManager em = entityManagerFactory.createEntityManager();
+        try{
+            return em.createQuery("select t from Track t", Track.class).getResultList();
+        }finally {
+            if (em.isOpen()) em.close();
+        }
+    }
+
+    public Optional<Track> findById(Integer id) {
+        logger.debug("Finding Track with id: {}", id);
+        EntityManager em = entityManagerFactory.createEntityManager();
+        try{
+            Track track = em.find(Track.class, id);
+            return Optional.ofNullable(track);
+        }finally {
+            if (em.isOpen()) em.close();
+        }
+    }
+
+    public Track update(Track track) {
+        logger.debug("Updating Track: {}", track.getTitle());
+        EntityManager em = entityManagerFactory.createEntityManager();
+        em.getTransaction().begin();
+        try {
+            Track updated = em.merge(track);
+            em.getTransaction().commit();
+            logger.debug("Track has been updated successfully");
+            return updated;
+        } catch (Exception e) {
+            em.getTransaction().rollback();
+            logger.error("Error while updating Track: {}", e.getMessage());
+            throw e;
+        } finally {
+            if (em.isOpen()) em.close();
+        }
+    }
+
+    public boolean deleteById(Integer id){
+        logger.debug("Deleting Track with id: {}", id);
+        EntityManager em = entityManagerFactory.createEntityManager();
+        em.getTransaction().begin();
+        try{
+            Track track = em.find(Track.class, id);
+            if (track == null) {
+                em.getTransaction().rollback();
+                return false;
+            }
+            em.remove(track);
+            em.getTransaction().commit();
+            logger.debug("Track has been deleted successfully");
+            return true;
+        } catch (Exception e) {
+            em.getTransaction().rollback();
+            logger.error("Error while deleting Track: {}", e.getMessage());
+            throw e;
+        } finally {
+            if (em.isOpen()) em.close();
+        }
+    }
+}

src/main/java/com/mediamanager/service/delegate/DelegateActionManager.java

@@ -3,6 +3,7 @@ package com.mediamanager.service.delegate;
 import com.google.protobuf.ByteString;
 import com.mediamanager.protocol.TransportProtocol;
 import com.mediamanager.repository.*;
+import com.mediamanager.repository.DiscRepository;
 import com.mediamanager.service.album.AlbumService;
 import com.mediamanager.service.albumart.AlbumArtService;
 import com.mediamanager.service.albumhasartist.AlbumHasArtistService;
@@ -11,10 +12,13 @@ import com.mediamanager.service.albumtype.AlbumTypeService;
 import com.mediamanager.service.bitdepth.BitDepthService;
 import com.mediamanager.service.bitrate.BitRateService;
 import com.mediamanager.service.composer.ComposerService;
+
 import com.mediamanager.repository.GenreRepository;
 import com.mediamanager.service.artist.ArtistService;
+import com.mediamanager.service.track.TrackService;
 import com.mediamanager.service.delegate.annotation.Action;
 
+import com.mediamanager.service.disc.DiscService;
 import com.mediamanager.service.genre.GenreService;
 import com.mediamanager.service.samplingrate.SamplingRateService;
 import jakarta.persistence.EntityManagerFactory;
@@ -100,6 +104,14 @@ public class DelegateActionManager {
         AlbumHasGenreService albumHasGenreService = new AlbumHasGenreService(albumHasGenreRepository, albumRepository, genreRepository);
         serviceLocator.register(AlbumHasGenreService.class, albumHasGenreService);
 
+        DiscRepository discRepository = new DiscRepository(entityManagerFactory);
+        DiscService discService = new DiscService(discRepository, albumRepository);
+        serviceLocator.register(DiscService.class, discService);
+
+        TrackRepository trackRepository = new TrackRepository(entityManagerFactory);
+        TrackService trackService = new TrackService(trackRepository, discRepository, composerRepository, bitDepthRepository, bitRateRepository, samplingRateRepository);
+        serviceLocator.register(TrackService.class, trackService);
+
         serviceLocator.logRegisteredServices();
 
         logger.info("Services initialized successfully");

src/main/java/com/mediamanager/service/delegate/handler/disc/CreateDiscHandler.java

@@ -0,0 +1,61 @@
+package com.mediamanager.service.delegate.handler.disc;
+
+import com.google.protobuf.ByteString;
+import com.google.protobuf.InvalidProtocolBufferException;
+import com.mediamanager.mapper.DiscMapper;
+import com.mediamanager.model.Disc;
+import com.mediamanager.protocol.TransportProtocol;
+import com.mediamanager.protocol.messages.DiscMessages;
+import com.mediamanager.service.delegate.ActionHandler;
+import com.mediamanager.service.delegate.annotation.Action;
+import com.mediamanager.service.disc.DiscService;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+@Action("disc.create")
+public class CreateDiscHandler implements ActionHandler {
+    private static final Logger logger = LogManager.getLogger(CreateDiscHandler.class);
+    private final DiscService discService;
+
+    public CreateDiscHandler(DiscService discService) {
+        this.discService = discService;
+    }
+
+    @Override
+    public TransportProtocol.Response.Builder handle(ByteString requestPayload) throws InvalidProtocolBufferException {
+        try {
+            DiscMessages.CreateDiscRequest createRequest =
+                    DiscMessages.CreateDiscRequest.parseFrom(requestPayload);
+
+            Disc disc = discService.createDisc(
+                    createRequest.getDiscNumber(),
+                    createRequest.getFkAlbumId() > 0 ? createRequest.getFkAlbumId() : null
+            );
+
+            DiscMessages.Disc discProto = DiscMapper.toProtobuf(disc);
+            DiscMessages.CreateDiscResponse createDiscResponse = DiscMessages.CreateDiscResponse.newBuilder()
+                    .setDisc(discProto)
+                    .build();
+            return TransportProtocol.Response.newBuilder()
+                    .setPayload(createDiscResponse.toByteString());
+        } catch (IllegalArgumentException e) {
+            logger.error("Validation error", e);
+            return TransportProtocol.Response.newBuilder()
+                    .setStatusCode(400)
+                    .setPayload(ByteString.copyFromUtf8("Invalid request"));
+
+        } catch (InvalidProtocolBufferException e) {
+            logger.error("Invalid CreateDiscRequest payload", e);
+            return TransportProtocol.Response.newBuilder()
+                    .setStatusCode(400)
+                    .setPayload(ByteString.copyFromUtf8("Invalid request payload"));
+
+        } catch (Exception e) {
+            logger.error("Error creating disc", e);
+            return TransportProtocol.Response.newBuilder()
+                    .setStatusCode(500)
+                    .setPayload(ByteString.copyFromUtf8("Internal server error"));
+        }
+    }
+    }
+

src/main/java/com/mediamanager/service/delegate/handler/disc/DeleteDiscHandler.java

@@ -0,0 +1,59 @@
+package com.mediamanager.service.delegate.handler.disc;
+
+import com.google.protobuf.ByteString;
+import com.google.protobuf.InvalidProtocolBufferException;
+import com.mediamanager.protocol.TransportProtocol;
+import com.mediamanager.protocol.messages.DiscMessages;
+import com.mediamanager.service.delegate.ActionHandler;
+import com.mediamanager.service.delegate.annotation.Action;
+import com.mediamanager.service.disc.DiscService;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+@Action("disc.delete")
+public class DeleteDiscHandler implements ActionHandler {
+    private static final Logger logger = LogManager.getLogger(DeleteDiscHandler.class);
+
+    private final DiscService discService;
+
+    public DeleteDiscHandler(DiscService discService) {
+        this.discService = discService;
+    }
+
+    @Override
+    public TransportProtocol.Response.Builder handle(ByteString requestPayload)
+            throws InvalidProtocolBufferException {
+
+        try {
+            DiscMessages.DeleteDiscRequest deleteRequest =
+                    DiscMessages.DeleteDiscRequest.parseFrom(requestPayload);
+            int id = deleteRequest.getId();
+            boolean success = discService.deleteDisc(id);
+            DiscMessages.DeleteDiscResponse deleteResponse;
+            if (success) {
+                deleteResponse = DiscMessages.DeleteDiscResponse.newBuilder()
+                        .setMessage("Disc deleted successfully")
+                        .build();
+                return TransportProtocol.Response.newBuilder()
+                        .setPayload(deleteResponse.toByteString());
+            } else {
+                deleteResponse = DiscMessages.DeleteDiscResponse.newBuilder()
+                        .setMessage("Disc not found")
+                        .build();
+
+                return TransportProtocol.Response.newBuilder()
+                        .setStatusCode(404)
+                        .setPayload(deleteResponse.toByteString());
+            }
+        } catch (Exception e) {
+            logger.error("Error deleting disc", e);
+            DiscMessages.DeleteDiscResponse deleteResponse =
+                    DiscMessages.DeleteDiscResponse.newBuilder()
+                            .setMessage("Error: " + e.getMessage())
+                            .build();
+            return TransportProtocol.Response.newBuilder()
+                    .setStatusCode(500)
+                    .setPayload(deleteResponse.toByteString());
+        }
+    }
+}

src/main/java/com/mediamanager/service/delegate/handler/disc/GetDiscByIdHandler.java

@@ -0,0 +1,56 @@
+package com.mediamanager.service.delegate.handler.disc;
+
+import com.google.protobuf.ByteString;
+import com.google.protobuf.InvalidProtocolBufferException;
+import com.mediamanager.mapper.DiscMapper;
+import com.mediamanager.model.Disc;
+import com.mediamanager.protocol.TransportProtocol;
+import com.mediamanager.protocol.messages.DiscMessages;
+import com.mediamanager.service.delegate.ActionHandler;
+import com.mediamanager.service.delegate.annotation.Action;
+import com.mediamanager.service.disc.DiscService;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.util.Optional;
+
+@Action(value = "disc.getById")
+public class GetDiscByIdHandler implements ActionHandler {
+    private static final Logger logger = LogManager.getLogger(GetDiscByIdHandler.class);
+    private final DiscService discService;
+
+    public GetDiscByIdHandler(DiscService discService) {
+        this.discService = discService;
+    }
+
+    @Override
+    public TransportProtocol.Response.Builder handle(ByteString requestPayload)
+        throws InvalidProtocolBufferException{
+
+        try{
+            DiscMessages.GetDiscByIdRequest getByIdRequest =
+                    DiscMessages.GetDiscByIdRequest.parseFrom(requestPayload);
+            int id = getByIdRequest.getId();
+
+            Optional<Disc> discOpt = discService.getDiscById(id);
+
+            if (discOpt.isEmpty()){
+                logger.warn("Disc not found with ID: {}", id);
+                return TransportProtocol.Response.newBuilder()
+                        .setStatusCode(404)
+                        .setPayload(ByteString.copyFromUtf8("Disc not found"));
+            }
+            DiscMessages.Disc discProto = DiscMapper.toProtobuf(discOpt.get());
+            DiscMessages.GetDiscByIdResponse getByIdResponse = DiscMessages.GetDiscByIdResponse.newBuilder()
+                    .setDisc(discProto)
+                    .build();
+            return TransportProtocol.Response.newBuilder()
+                    .setPayload(getByIdResponse.toByteString());
+        } catch (Exception e) {
+            logger.error("Error getting disc by ID", e);
+            return TransportProtocol.Response.newBuilder()
+                    .setStatusCode(500)
+                    .setPayload(ByteString.copyFromUtf8("Error: "+ e.getMessage()));
+        }
+    }
+}

src/main/java/com/mediamanager/service/delegate/handler/disc/GetDiscHandler.java

@@ -0,0 +1,47 @@
+package com.mediamanager.service.delegate.handler.disc;
+
+import com.google.protobuf.ByteString;
+import com.google.protobuf.InvalidProtocolBufferException;
+import com.mediamanager.mapper.DiscMapper;
+import com.mediamanager.model.Disc;
+import com.mediamanager.protocol.TransportProtocol;
+import com.mediamanager.protocol.messages.DiscMessages;
+import com.mediamanager.service.delegate.ActionHandler;
+import com.mediamanager.service.delegate.annotation.Action;
+import com.mediamanager.service.disc.DiscService;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.util.List;
+
+@Action("disc.getAll")
+public class GetDiscHandler implements ActionHandler {
+    private static final Logger logger = LogManager.getLogger(GetDiscHandler.class);
+
+    private final DiscService discService;
+
+    public GetDiscHandler(DiscService discService){this.discService = discService;}
+
+    @Override
+    public TransportProtocol.Response.Builder handle(ByteString requestPayload) throws InvalidProtocolBufferException {
+        try{
+            List<Disc> discs = discService.getAllDiscs();
+            DiscMessages.GetDiscsResponse.Builder responseBuilder = DiscMessages.GetDiscsResponse.newBuilder();
+
+            for (Disc disc : discs) {
+                DiscMessages.Disc discProto = DiscMapper.toProtobuf(disc);
+                responseBuilder.addDiscs(discProto);
+            }
+            DiscMessages.GetDiscsResponse getDiscsResponse = responseBuilder.build();
+
+            return TransportProtocol.Response.newBuilder()
+                    .setPayload(getDiscsResponse.toByteString());
+
+        }catch (Exception e){
+            logger.error("Error getting discs", e);
+            return TransportProtocol.Response.newBuilder()
+                    .setStatusCode(500)
+                    .setPayload(ByteString.copyFromUtf8("Error: " + e.getMessage()));
+        }
+    }
+}

src/main/java/com/mediamanager/service/delegate/handler/disc/UpdateDiscHandler.java

@@ -0,0 +1,72 @@
+package com.mediamanager.service.delegate.handler.disc;
+
+import com.google.protobuf.ByteString;
+import com.google.protobuf.InvalidProtocolBufferException;
+import com.mediamanager.mapper.DiscMapper;
+import com.mediamanager.model.Disc;
+import com.mediamanager.protocol.TransportProtocol;
+import com.mediamanager.protocol.messages.DiscMessages;
+import com.mediamanager.service.delegate.ActionHandler;
+import com.mediamanager.service.delegate.annotation.Action;
+import com.mediamanager.service.disc.DiscService;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.util.Optional;
+
+@Action("disc.update")
+public class UpdateDiscHandler implements ActionHandler {
+    private static final Logger logger = LogManager.getLogger(UpdateDiscHandler.class);
+    private final DiscService discService;
+
+    public UpdateDiscHandler(DiscService discService) {
+        this.discService = discService;
+    }
+
+    @Override
+    public TransportProtocol.Response.Builder handle(ByteString requestPayload)
+            throws InvalidProtocolBufferException {
+        try {
+            DiscMessages.UpdateDiscRequest updateRequest =
+                    DiscMessages.UpdateDiscRequest.parseFrom(requestPayload);
+
+            int id = updateRequest.getId();
+            Integer discNumber = updateRequest.getDiscNumber();
+            Integer albumId = updateRequest.getFkAlbumId() > 0 ? updateRequest.getFkAlbumId() : null;
+
+            Optional<Disc> discOpt = discService.updateDisc(
+                    id,
+                    discNumber,
+                    albumId
+            );
+
+            if (discOpt.isEmpty()) {
+                logger.warn("Disc not found with ID: {}", id);
+                return TransportProtocol.Response.newBuilder()
+                        .setStatusCode(404)
+                        .setPayload(ByteString.copyFromUtf8("Disc not found"));
+            }
+
+            DiscMessages.Disc discProto = DiscMapper.toProtobuf(discOpt.get());
+
+            DiscMessages.UpdateDiscResponse updateResponse =
+                    DiscMessages.UpdateDiscResponse.newBuilder()
+                            .setDisc(discProto)
+                            .build();
+
+            return TransportProtocol.Response.newBuilder()
+                    .setPayload(updateResponse.toByteString());
+
+        } catch (IllegalArgumentException e) {
+            logger.error("Validation error", e);
+            return TransportProtocol.Response.newBuilder()
+                    .setStatusCode(400)
+                    .setPayload(ByteString.copyFromUtf8("Validation error: " + e.getMessage()));
+        } catch (Exception e) {
+            logger.error("Error updating disc", e);
+            return TransportProtocol.Response.newBuilder()
+                    .setStatusCode(500)
+                    .setPayload(ByteString.copyFromUtf8("Error: " + e.getMessage()));
+        }
+    }
+}

src/main/java/com/mediamanager/service/delegate/handler/track/CreateTrackHandler.java

@@ -0,0 +1,61 @@
+package com.mediamanager.service.delegate.handler.track;
+
+import com.google.protobuf.ByteString;
+import com.google.protobuf.InvalidProtocolBufferException;
+import com.mediamanager.mapper.TrackMapper;
+import com.mediamanager.model.Track;
+import com.mediamanager.protocol.TransportProtocol;
+import com.mediamanager.protocol.messages.TrackMessages;
+import com.mediamanager.service.delegate.ActionHandler;
+import com.mediamanager.service.delegate.annotation.Action;
+import com.mediamanager.service.track.TrackService;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+@Action("track.create")
+public class CreateTrackHandler implements ActionHandler {
+    private static final Logger logger = LogManager.getLogger(CreateTrackHandler.class);
+    private final TrackService trackService;
+
+    public CreateTrackHandler(TrackService trackService) {
+        this.trackService = trackService;
+    }
+
+    @Override
+    public TransportProtocol.Response.Builder handle(ByteString requestPayload) throws InvalidProtocolBufferException {
+        try{
+            TrackMessages.CreateTrackRequest createRequest =
+                    TrackMessages.CreateTrackRequest.parseFrom(requestPayload);
+
+            Track track = trackService.createTrack(
+                    createRequest.getTrackNumber(),
+                    createRequest.getTitle(),
+                    createRequest.hasDuration() ? createRequest.getDuration().getValue() : null,
+                    createRequest.getFilepath(),
+                    createRequest.getFkDiscId() > 0 ? createRequest.getFkDiscId() : null,
+                    createRequest.hasFkComposerId() ? createRequest.getFkComposerId().getValue() : null,
+                    createRequest.hasFkBitdepthId() ? createRequest.getFkBitdepthId().getValue() : null,
+                    createRequest.hasFkBitrateId() ? createRequest.getFkBitrateId().getValue() : null,
+                    createRequest.hasFkSamplingrateId() ? createRequest.getFkSamplingrateId().getValue() : null
+            );
+
+            TrackMessages.Track trackProto = TrackMapper.toProtobuf(track);
+            TrackMessages.CreateTrackResponse createTrackResponse = TrackMessages.CreateTrackResponse.newBuilder()
+                    .setTrack(trackProto)
+                    .build();
+            return TransportProtocol.Response.newBuilder()
+                    .setPayload(createTrackResponse.toByteString());
+        } catch (IllegalArgumentException e) {
+            logger.error("Validation error", e);
+            return TransportProtocol.Response.newBuilder()
+                    .setStatusCode(400)
+                    .setPayload(ByteString.copyFromUtf8("Validation error: " + e.getMessage()));
+
+        } catch (Exception e) {
+            logger.error("Error creating track", e);
+            return TransportProtocol.Response.newBuilder()
+                    .setStatusCode(500)
+                    .setPayload(ByteString.copyFromUtf8("Error: " + e.getMessage()));
+        }
+    }
+}

src/main/java/com/mediamanager/service/delegate/handler/track/DeleteTrackHandler.java

@@ -0,0 +1,62 @@
+package com.mediamanager.service.delegate.handler.track;
+
+import com.google.protobuf.ByteString;
+import com.google.protobuf.InvalidProtocolBufferException;
+import com.mediamanager.protocol.TransportProtocol;
+import com.mediamanager.protocol.messages.TrackMessages;
+import com.mediamanager.service.delegate.ActionHandler;
+import com.mediamanager.service.delegate.annotation.Action;
+import com.mediamanager.service.track.TrackService;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+@Action("track.delete")
+public class DeleteTrackHandler implements ActionHandler {
+    private static final Logger logger = LogManager.getLogger(DeleteTrackHandler.class);
+
+    private final TrackService trackService;
+
+    public DeleteTrackHandler(TrackService trackService) {
+        this.trackService = trackService;
+    }
+
+    @Override
+    public TransportProtocol.Response.Builder handle(ByteString requestPayload)
+            throws InvalidProtocolBufferException {
+
+        try {
+            TrackMessages.DeleteTrackRequest deleteRequest =
+                    TrackMessages.DeleteTrackRequest.parseFrom(requestPayload);
+            int id = deleteRequest.getId();
+            boolean success = trackService.deleteTrack(id);
+            TrackMessages.DeleteTrackResponse deleteResponse;
+            if (success) {
+                deleteResponse = TrackMessages.DeleteTrackResponse.newBuilder()
+                        .setSuccess(true)
+                        .setMessage("Track deleted successfully")
+                        .build();
+                return TransportProtocol.Response.newBuilder()
+                        .setPayload(deleteResponse.toByteString());
+            } else {
+                deleteResponse = TrackMessages.DeleteTrackResponse.newBuilder()
+                        .setSuccess(false)
+                        .setMessage("Track not found")
+                        .build();
+
+                return TransportProtocol.Response.newBuilder()
+                        .setStatusCode(404)
+                        .setPayload(deleteResponse.toByteString());
+            }
+        } catch (Exception e) {
+            logger.error("Error deleting track", e);
+            TrackMessages.DeleteTrackResponse deleteResponse =
+                    TrackMessages.DeleteTrackResponse.newBuilder()
+                            .setSuccess(false)
+                            .setMessage("Error: " + e.getMessage())
+                            .build();
+            return TransportProtocol.Response.newBuilder()
+                    .setStatusCode(500)
+                    .setPayload(deleteResponse.toByteString());
+        }
+    }
+}

src/main/java/com/mediamanager/service/delegate/handler/track/GetTrackByIdHandler.java

@@ -0,0 +1,56 @@
+package com.mediamanager.service.delegate.handler.track;
+
+import com.google.protobuf.ByteString;
+import com.google.protobuf.InvalidProtocolBufferException;
+import com.mediamanager.mapper.TrackMapper;
+import com.mediamanager.model.Track;
+import com.mediamanager.protocol.TransportProtocol;
+import com.mediamanager.protocol.messages.TrackMessages;
+import com.mediamanager.service.delegate.ActionHandler;
+import com.mediamanager.service.delegate.annotation.Action;
+import com.mediamanager.service.track.TrackService;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.util.Optional;
+
+@Action(value = "track.getById")
+public class GetTrackByIdHandler implements ActionHandler {
+    private static final Logger logger = LogManager.getLogger(GetTrackByIdHandler.class);
+    private final TrackService trackService;
+
+    public GetTrackByIdHandler(TrackService trackService) {
+        this.trackService = trackService;
+    }
+
+    @Override
+    public TransportProtocol.Response.Builder handle(ByteString requestPayload)
+        throws InvalidProtocolBufferException{
+
+        try{
+            TrackMessages.GetTrackByIdRequest getByIdRequest =
+                    TrackMessages.GetTrackByIdRequest.parseFrom(requestPayload);
+            int id = getByIdRequest.getId();
+
+            Optional<Track> trackOpt = trackService.getTrackById(id);
+
+            if (trackOpt.isEmpty()){
+                logger.warn("Track not found with ID: {}", id);
+                return TransportProtocol.Response.newBuilder()
+                        .setStatusCode(404)
+                        .setPayload(ByteString.copyFromUtf8("Track not found"));
+            }
+            TrackMessages.Track trackProto = TrackMapper.toProtobuf(trackOpt.get());
+            TrackMessages.GetTrackByIdResponse getByIdResponse = TrackMessages.GetTrackByIdResponse.newBuilder()
+                    .setTrack(trackProto)
+                    .build();
+            return TransportProtocol.Response.newBuilder()
+                    .setPayload(getByIdResponse.toByteString());
+        } catch (Exception e) {
+            logger.error("Error getting track by ID", e);
+            return TransportProtocol.Response.newBuilder()
+                    .setStatusCode(500)
+                    .setPayload(ByteString.copyFromUtf8("Error: "+ e.getMessage()));
+        }
+    }
+}

src/main/java/com/mediamanager/service/delegate/handler/track/GetTrackHandler.java

@@ -0,0 +1,47 @@
+package com.mediamanager.service.delegate.handler.track;
+
+import com.google.protobuf.ByteString;
+import com.google.protobuf.InvalidProtocolBufferException;
+import com.mediamanager.mapper.TrackMapper;
+import com.mediamanager.model.Track;
+import com.mediamanager.protocol.TransportProtocol;
+import com.mediamanager.protocol.messages.TrackMessages;
+import com.mediamanager.service.delegate.ActionHandler;
+import com.mediamanager.service.delegate.annotation.Action;
+import com.mediamanager.service.track.TrackService;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.util.List;
+
+@Action("track.getAll")
+public class GetTrackHandler implements ActionHandler {
+    private static final Logger logger = LogManager.getLogger(GetTrackHandler.class);
+
+    private final TrackService trackService;
+
+    public GetTrackHandler(TrackService trackService){this.trackService = trackService;}
+
+    @Override
+    public TransportProtocol.Response.Builder handle(ByteString requestPayload) throws InvalidProtocolBufferException {
+        try{
+            List<Track> tracks = trackService.getAllTracks();
+            TrackMessages.GetTracksResponse.Builder responseBuilder = TrackMessages.GetTracksResponse.newBuilder();
+
+            for (Track track : tracks) {
+                TrackMessages.Track trackProto = TrackMapper.toProtobuf(track);
+                responseBuilder.addTracks(trackProto);
+            }
+            TrackMessages.GetTracksResponse getTracksResponse = responseBuilder.build();
+
+            return TransportProtocol.Response.newBuilder()
+                    .setPayload(getTracksResponse.toByteString());
+
+        }catch (Exception e){
+            logger.error("Error getting tracks", e);
+            return TransportProtocol.Response.newBuilder()
+                    .setStatusCode(500)
+                    .setPayload(ByteString.copyFromUtf8("Error: " + e.getMessage()));
+        }
+    }
+}

src/main/java/com/mediamanager/service/delegate/handler/track/UpdateTrackHandler.java

@@ -0,0 +1,86 @@
+package com.mediamanager.service.delegate.handler.track;
+
+import com.google.protobuf.ByteString;
+import com.google.protobuf.InvalidProtocolBufferException;
+import com.mediamanager.mapper.TrackMapper;
+import com.mediamanager.model.Track;
+import com.mediamanager.protocol.TransportProtocol;
+import com.mediamanager.protocol.messages.TrackMessages;
+import com.mediamanager.service.delegate.ActionHandler;
+import com.mediamanager.service.delegate.annotation.Action;
+import com.mediamanager.service.track.TrackService;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.util.Optional;
+
+@Action("track.update")
+public class UpdateTrackHandler implements ActionHandler {
+    private static final Logger logger = LogManager.getLogger(UpdateTrackHandler.class);
+    private final TrackService trackService;
+
+    public UpdateTrackHandler(TrackService trackService) {
+        this.trackService = trackService;
+    }
+
+    @Override
+    public TransportProtocol.Response.Builder handle(ByteString requestPayload)
+            throws InvalidProtocolBufferException {
+        try {
+            TrackMessages.UpdateTrackRequest updateRequest =
+                    TrackMessages.UpdateTrackRequest.parseFrom(requestPayload);
+
+            int id = updateRequest.getId();
+            Integer trackNumber = updateRequest.hasTrackNumber() ? updateRequest.getTrackNumber().getValue() : null;
+            String title = updateRequest.getTitle();
+            Integer duration = updateRequest.hasDuration() ? updateRequest.getDuration().getValue() : null;
+            String filepath = updateRequest.getFilepath();
+            Integer discId = updateRequest.hasFkDiscId() ? updateRequest.getFkDiscId().getValue() : null;
+            Integer composerId = updateRequest.hasFkComposerId() ? updateRequest.getFkComposerId().getValue() : null;
+            Integer bitDepthId = updateRequest.hasFkBitdepthId() ? updateRequest.getFkBitdepthId().getValue() : null;
+            Integer bitRateId = updateRequest.hasFkBitrateId() ? updateRequest.getFkBitrateId().getValue() : null;
+            Integer samplingRateId = updateRequest.hasFkSamplingrateId() ? updateRequest.getFkSamplingrateId().getValue() : null;
+
+            Optional<Track> trackOpt = trackService.updateTrack(
+                    id,
+                    trackNumber,
+                    title,
+                    duration,
+                    filepath,
+                    discId,
+                    composerId,
+                    bitDepthId,
+                    bitRateId,
+                    samplingRateId
+            );
+
+            if (trackOpt.isEmpty()) {
+                logger.warn("Track not found with ID: {}", id);
+                return TransportProtocol.Response.newBuilder()
+                        .setStatusCode(404)
+                        .setPayload(ByteString.copyFromUtf8("Track not found"));
+            }
+
+            TrackMessages.Track trackProto = TrackMapper.toProtobuf(trackOpt.get());
+
+            TrackMessages.UpdateTrackResponse updateResponse =
+                    TrackMessages.UpdateTrackResponse.newBuilder()
+                            .setTrack(trackProto)
+                            .build();
+
+            return TransportProtocol.Response.newBuilder()
+                    .setPayload(updateResponse.toByteString());
+
+        } catch (IllegalArgumentException e) {
+            logger.error("Validation error", e);
+            return TransportProtocol.Response.newBuilder()
+                    .setStatusCode(400)
+                    .setPayload(ByteString.copyFromUtf8("Validation error: " + e.getMessage()));
+        } catch (Exception e) {
+            logger.error("Error updating track", e);
+            return TransportProtocol.Response.newBuilder()
+                    .setStatusCode(500)
+                    .setPayload(ByteString.copyFromUtf8("Error: " + e.getMessage()));
+        }
+    }
+}

src/main/java/com/mediamanager/service/disc/DiscService.java

@@ -0,0 +1,98 @@
+package com.mediamanager.service.disc;
+
+import com.mediamanager.model.Album;
+import com.mediamanager.model.Disc;
+import com.mediamanager.repository.AlbumRepository;
+import com.mediamanager.repository.DiscRepository;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.util.List;
+import java.util.Optional;
+
+public class DiscService {
+    private static final Logger logger = LogManager.getLogger(DiscService.class);
+    private final DiscRepository repository;
+    private final AlbumRepository albumRepository;
+
+    public DiscService(DiscRepository repository, AlbumRepository albumRepository) {
+        this.repository = repository;
+        this.albumRepository = albumRepository;
+    }
+
+    public Disc createDisc(Integer discNumber, Integer albumId) {
+        logger.debug("Creating disc with number: {}", discNumber);
+        if (discNumber == null) {
+            throw new IllegalArgumentException("Disc number cannot be null");
+        }
+        if (albumId == null) {
+            throw new IllegalArgumentException("Album ID cannot be null");
+        }
+
+        Disc disc = new Disc();
+        disc.setDiscNumber(discNumber);
+
+        // Set Album (required)
+        Optional<Album> album = albumRepository.findById(albumId);
+        if (album.isEmpty()) {
+            throw new IllegalArgumentException("Album not found with id: " + albumId);
+        }
+        disc.setAlbum(album.get());
+
+        return repository.save(disc);
+    }
+
+    public List<Disc> getAllDiscs() {
+        logger.info("Getting all discs");
+        return repository.findAll();
+    }
+
+    public Optional<Disc> getDiscById(Integer id) {
+        if (id == null) {
+            throw new IllegalArgumentException("ID cannot be null");
+        }
+        logger.info("Getting disc by id: {}", id);
+        return repository.findById(id);
+    }
+
+    public Optional<Disc> updateDisc(Integer id, Integer discNumber, Integer albumId) {
+        if (id == null) {
+            throw new IllegalArgumentException("ID cannot be null");
+        }
+        if (discNumber == null) {
+            throw new IllegalArgumentException("Disc number cannot be null");
+        }
+        if (albumId == null) {
+            throw new IllegalArgumentException("Album ID cannot be null");
+        }
+
+        logger.info("Updating disc with id: {}", id);
+
+        Optional<Disc> existingDisc = repository.findById(id);
+        if (existingDisc.isEmpty()) {
+            logger.warn("Disc not found with id: {}", id);
+            return Optional.empty();
+        }
+
+        Disc disc = existingDisc.get();
+        disc.setDiscNumber(discNumber);
+
+        // Update Album
+        Optional<Album> album = albumRepository.findById(albumId);
+        if (album.isEmpty()) {
+            throw new IllegalArgumentException("Album not found with id: " + albumId);
+        }
+        disc.setAlbum(album.get());
+
+        Disc updatedDisc = repository.update(disc);
+        return Optional.of(updatedDisc);
+    }
+
+    public boolean deleteDisc(Integer id) {
+        if (id == null) {
+            throw new IllegalArgumentException("Disc id cannot be null");
+        }
+        logger.info("Deleting disc: {}", id);
+        return repository.deleteById(id);
+    }
+}

src/main/java/com/mediamanager/service/track/TrackService.java

@@ -0,0 +1,213 @@
+package com.mediamanager.service.track;
+
+import com.mediamanager.model.*;
+import com.mediamanager.repository.*;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.util.List;
+import java.util.Optional;
+
+public class TrackService {
+    private static final Logger logger = LogManager.getLogger(TrackService.class);
+    private final TrackRepository repository;
+    private final DiscRepository discRepository;
+    private final ComposerRepository composerRepository;
+    private final BitDepthRepository bitDepthRepository;
+    private final BitRateRepository bitRateRepository;
+    private final SamplingRateRepository samplingRateRepository;
+
+    public TrackService(TrackRepository repository,
+                       DiscRepository discRepository,
+                       ComposerRepository composerRepository,
+                       BitDepthRepository bitDepthRepository,
+                       BitRateRepository bitRateRepository,
+                       SamplingRateRepository samplingRateRepository) {
+        this.repository = repository;
+        this.discRepository = discRepository;
+        this.composerRepository = composerRepository;
+        this.bitDepthRepository = bitDepthRepository;
+        this.bitRateRepository = bitRateRepository;
+        this.samplingRateRepository = samplingRateRepository;
+    }
+
+    public Track createTrack(Integer trackNumber, String title, Integer duration,
+                           String filepath, Integer discId, Integer composerId,
+                           Integer bitDepthId, Integer bitRateId, Integer samplingRateId) {
+        logger.debug("Creating track with title: {}", title);
+
+        if (trackNumber == null) {
+            throw new IllegalArgumentException("Track number cannot be null");
+        }
+        if (title == null || title.isEmpty()) {
+            throw new IllegalArgumentException("Title cannot be null or empty");
+        }
+        if (filepath == null || filepath.isEmpty()) {
+            throw new IllegalArgumentException("Filepath cannot be null or empty");
+        }
+        if (discId == null) {
+            throw new IllegalArgumentException("Disc ID cannot be null");
+        }
+
+        Track track = new Track();
+        track.setTrackNumber(trackNumber);
+        track.setTitle(title);
+        track.setDuration(duration);
+        track.setFilepath(filepath);
+
+        // Set Disc (required)
+        Optional<Disc> disc = discRepository.findById(discId);
+        if (disc.isEmpty()) {
+            throw new IllegalArgumentException("Disc not found with id: " + discId);
+        }
+        track.setDisc(disc.get());
+
+        // Set Composer (optional)
+        if (composerId != null) {
+            Optional<Composer> composer = composerRepository.findById(composerId);
+            if (composer.isEmpty()) {
+                throw new IllegalArgumentException("Composer not found with id: " + composerId);
+            }
+            track.setComposer(composer.get());
+        }
+
+        // Set BitDepth (optional)
+        if (bitDepthId != null) {
+            Optional<BitDepth> bitDepth = bitDepthRepository.findById(bitDepthId);
+            if (bitDepth.isEmpty()) {
+                throw new IllegalArgumentException("BitDepth not found with id: " + bitDepthId);
+            }
+            track.setBitDepth(bitDepth.get());
+        }
+
+        // Set BitRate (optional)
+        if (bitRateId != null) {
+            Optional<BitRate> bitRate = bitRateRepository.findById(bitRateId);
+            if (bitRate.isEmpty()) {
+                throw new IllegalArgumentException("BitRate not found with id: " + bitRateId);
+            }
+            track.setBitRate(bitRate.get());
+        }
+
+        // Set SamplingRate (optional)
+        if (samplingRateId != null) {
+            Optional<SamplingRate> samplingRate = samplingRateRepository.findById(samplingRateId);
+            if (samplingRate.isEmpty()) {
+                throw new IllegalArgumentException("SamplingRate not found with id: " + samplingRateId);
+            }
+            track.setSamplingRate(samplingRate.get());
+        }
+
+        return repository.save(track);
+    }
+
+    public List<Track> getAllTracks() {
+        logger.info("Getting all tracks");
+        return repository.findAll();
+    }
+
+    public Optional<Track> getTrackById(Integer id) {
+        if (id == null) {
+            throw new IllegalArgumentException("ID cannot be null");
+        }
+        logger.info("Getting track by id: {}", id);
+        return repository.findById(id);
+    }
+
+    public Optional<Track> updateTrack(Integer id, Integer trackNumber, String title,
+                                      Integer duration, String filepath, Integer discId,
+                                      Integer composerId, Integer bitDepthId,
+                                      Integer bitRateId, Integer samplingRateId) {
+        if (id == null) {
+            throw new IllegalArgumentException("ID cannot be null");
+        }
+        if (trackNumber == null) {
+            throw new IllegalArgumentException("Track number cannot be null");
+        }
+        if (title == null || title.isEmpty()) {
+            throw new IllegalArgumentException("Title cannot be null or empty");
+        }
+        if (filepath == null || filepath.isEmpty()) {
+            throw new IllegalArgumentException("Filepath cannot be null or empty");
+        }
+        if (discId == null) {
+            throw new IllegalArgumentException("Disc ID cannot be null");
+        }
+
+        logger.info("Updating track with id: {}", id);
+
+        Optional<Track> existingTrack = repository.findById(id);
+        if (existingTrack.isEmpty()) {
+            logger.warn("Track not found with id: {}", id);
+            return Optional.empty();
+        }
+
+        Track track = existingTrack.get();
+        track.setTrackNumber(trackNumber);
+        track.setTitle(title);
+        track.setDuration(duration);
+        track.setFilepath(filepath);
+
+        // Update Disc (required)
+        Optional<Disc> disc = discRepository.findById(discId);
+        if (disc.isEmpty()) {
+            throw new IllegalArgumentException("Disc not found with id: " + discId);
+        }
+        track.setDisc(disc.get());
+
+        // Update Composer (optional)
+        if (composerId != null) {
+            Optional<Composer> composer = composerRepository.findById(composerId);
+            if (composer.isEmpty()) {
+                throw new IllegalArgumentException("Composer not found with id: " + composerId);
+            }
+            track.setComposer(composer.get());
+        } else {
+            track.setComposer(null);
+        }
+
+        // Update BitDepth (optional)
+        if (bitDepthId != null) {
+            Optional<BitDepth> bitDepth = bitDepthRepository.findById(bitDepthId);
+            if (bitDepth.isEmpty()) {
+                throw new IllegalArgumentException("BitDepth not found with id: " + bitDepthId);
+            }
+            track.setBitDepth(bitDepth.get());
+        } else {
+            track.setBitDepth(null);
+        }
+
+        // Update BitRate (optional)
+        if (bitRateId != null) {
+            Optional<BitRate> bitRate = bitRateRepository.findById(bitRateId);
+            if (bitRate.isEmpty()) {
+                throw new IllegalArgumentException("BitRate not found with id: " + bitRateId);
+            }
+            track.setBitRate(bitRate.get());
+        } else {
+            track.setBitRate(null);
+        }
+
+        // Update SamplingRate (optional)
+        if (samplingRateId != null) {
+            Optional<SamplingRate> samplingRate = samplingRateRepository.findById(samplingRateId);
+            if (samplingRate.isEmpty()) {
+                throw new IllegalArgumentException("SamplingRate not found with id: " + samplingRateId);
+            }
+            track.setSamplingRate(samplingRate.get());
+        } else {
+            track.setSamplingRate(null);
+        }
+
+        Track updatedTrack = repository.update(track);
+        return Optional.of(updatedTrack);
+    }
+
+    public boolean deleteTrack(Integer id) {
+        if (id == null) {
+            throw new IllegalArgumentException("Track id cannot be null");
+        }
+        logger.info("Deleting track: {}", id);
+        return repository.deleteById(id);
+    }
+}

src/main/proto/disc.proto

@@ -0,0 +1,54 @@
+syntax = "proto3";
+
+option java_package = "com.mediamanager.protocol.messages";
+option java_outer_classname = "DiscMessages";
+
+package mediamanager.messages;
+
+message Disc{
+  int32 id = 1;
+  int32 disc_number = 2;
+  int32 fk_album_id = 3;
+}
+
+message CreateDiscRequest {
+  int32 disc_number = 1;
+  int32 fk_album_id = 2;
+}
+
+message CreateDiscResponse {
+  Disc disc = 1;
+}
+
+message GetDiscsRequest {
+}
+
+message GetDiscsResponse {
+  repeated Disc discs = 1;
+}
+
+message GetDiscByIdRequest {
+  int32 id = 1;
+}
+
+message GetDiscByIdResponse {
+  Disc disc = 1;
+}
+
+message UpdateDiscRequest {
+  int32 id = 1;
+  int32 disc_number = 2;
+  int32 fk_album_id = 3;
+}
+
+message UpdateDiscResponse {
+  Disc disc = 1;
+}
+
+message DeleteDiscRequest {
+  int32 id = 1;
+}
+
+message DeleteDiscResponse {
+  string message = 1;
+}

src/main/proto/track.proto

@@ -0,0 +1,81 @@
+syntax = "proto3";
+
+import "google/protobuf/wrappers.proto";
+
+option java_package = "com.mediamanager.protocol.messages";
+option java_outer_classname = "TrackMessages";
+
+package mediamanager.messages;
+
+message Track{
+  int32 id = 1;
+  int32 track_number = 2;
+  string title = 3;
+  int32 duration = 4;
+  string filepath = 5;
+
+  int32 fk_disc_id = 6;
+  int32 fk_composer_id = 7;
+  int32 fk_bitdepth_id = 8;
+  int32 fk_bitrate_id = 9;
+  int32 fk_samplingrate_id = 10;
+}
+
+message CreateTrackRequest {
+  int32 track_number = 1;
+  string title = 2;
+  google.protobuf.Int32Value duration = 3;
+  string filepath = 4;
+
+  int32 fk_disc_id = 5;
+  google.protobuf.Int32Value fk_composer_id = 6;
+  google.protobuf.Int32Value fk_bitdepth_id = 7;
+  google.protobuf.Int32Value fk_bitrate_id = 8;
+  google.protobuf.Int32Value fk_samplingrate_id = 9;
+}
+
+message CreateTrackResponse {
+  Track track = 1;
+}
+
+message GetTracksRequest {
+}
+
+message GetTracksResponse {
+  repeated Track tracks = 1;
+}
+
+message GetTrackByIdRequest {
+  int32 id = 1;
+}
+
+message GetTrackByIdResponse {
+  Track track = 1;
+}
+
+message UpdateTrackRequest {
+  int32 id = 1;
+  google.protobuf.Int32Value track_number = 2;
+  string title = 3;
+  google.protobuf.Int32Value duration = 4;
+  string filepath = 5;
+
+  google.protobuf.Int32Value fk_disc_id = 6;
+  google.protobuf.Int32Value fk_composer_id = 7;
+  google.protobuf.Int32Value fk_bitdepth_id = 8;
+  google.protobuf.Int32Value fk_bitrate_id = 9;
+  google.protobuf.Int32Value fk_samplingrate_id = 10;
+}
+
+message UpdateTrackResponse {
+  Track track = 1;
+}
+
+message DeleteTrackRequest {
+  int32 id = 1;
+}
+
+message DeleteTrackResponse {
+  bool success = 1;
+  string message = 2;
+}