Fix logging library dependency in pom.xml: replace log4j-slf4j2-impl with log4j-slf4j-impl.

- Created `SqliteDatabaseManager` for SQLite database initialization and management.
- Refactored `DatabaseManager` into an abstract class to support different database implementations.
- Introduced `ApplicationMode` enum to switch between `local` and `server` modes.
- Updated `MediaManagerApplication` to handle `runtype` configuration and initialize SQLite in `local` mode.
- Updated `config.properties.example` with new `runtype` property.
- Added SQLite JDBC dependency to `pom.xml`.

pom.xml

@@ -55,7 +55,7 @@
         </dependency>
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
-            <artifactId>log4j-slf4j2-impl</artifactId>
+            <artifactId>log4j-slf4j-impl</artifactId>
             <version>${log4j.version}</version>
         </dependency>
 
@@ -78,9 +78,27 @@
             <version>${junit.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.google.protobuf</groupId>
+            <artifactId>protobuf-java</artifactId>
+            <version>4.32.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.xerial</groupId>
+            <artifactId>sqlite-jdbc</artifactId>
+            <version>3.44.1.0</version>
+        </dependency>
     </dependencies>
 
     <build>
+        <extensions>
+            <extension>
+                <groupId>kr.motd.maven</groupId>
+                <artifactId>os-maven-plugin</artifactId>
+                <version>1.7.1</version>
+            </extension>
+        </extensions>
+
         <plugins>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
@@ -91,12 +109,54 @@
                     <target>17</target>
                 </configuration>
             </plugin>
+
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
                 <version>3.2.5</version>
             </plugin>
 
+            <!-- Protocol Buffers Plugin -->
+            <plugin>
+                <groupId>org.xolstice.maven.plugins</groupId>
+                <artifactId>protobuf-maven-plugin</artifactId>
+                <version>0.6.1</version>
+                <configuration>
+                    <protocExecutable>/usr/bin/protoc</protocExecutable>
+                    <protoSourceRoot>${project.basedir}/src/main/proto</protoSourceRoot>
+                    <outputDirectory>${project.build.directory}/generated-sources/protobuf/java</outputDirectory>
+                    <clearOutputDirectory>false</clearOutputDirectory>
+                </configuration>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>compile</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+
+            <!-- Build Helper Plugin - Adiciona generated sources ao classpath -->
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>build-helper-maven-plugin</artifactId>
+                <version>3.5.0</version>
+                <executions>
+                    <execution>
+                        <id>add-source</id>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>add-source</goal>
+                        </goals>
+                        <configuration>
+                            <sources>
+                                <source>${project.build.directory}/generated-sources/protobuf/java</source>
+                            </sources>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+
             <!-- Maven Shade Plugin - Creates executable JAR with all dependencies -->
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>

src/main/java/com/mediamanager/MediaManagerApplication.java

@@ -1,5 +1,7 @@
 package com.mediamanager;
 
+import com.mediamanager.service.database.DatabaseManager;
+import com.mediamanager.service.delegate.DelegateActionManager;
 import com.mediamanager.service.ipc.IPCManager;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
@@ -8,24 +10,59 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.util.Properties;
 
-import com.mediamanager.service.database.DatabaseManager;
+import com.mediamanager.service.database.SqliteDatabaseManager;
 
 public class MediaManagerApplication {
     private static final Logger logger = LogManager.getLogger(MediaManagerApplication.class);
     private static Properties config;
     private static DatabaseManager databaseManager;
+    private static DelegateActionManager actionManager;
     private static IPCManager ipcManager;
 
+    public enum ApplicationMode {
+        LOCAL("local"),
+        SERVER("server");
+
+        private final String value;
+
+        ApplicationMode(String value) {
+            this.value = value;
+        }
+    }
+
     public static void main(String[] args) {
         logger.info("Starting MediaManager Core Application...");
 
         try {
             // Load configuration
             loadConfiguration();
-            databaseManager = new DatabaseManager(config);
-            databaseManager.init();
+            String runTypeString = config.getProperty("runtype","local");
+            ApplicationMode mode = null;
 
-            ipcManager = new IPCManager(config);
+            for (ApplicationMode am : ApplicationMode.values()) {
+                if (am.value.equalsIgnoreCase(runTypeString)) {
+                    mode = am;
+                    break;
+                }
+            }
+            if (mode == null) {
+                logger.error("Invalid run type: {}", runTypeString);
+                throw new Exception("Invalid run type: " + runTypeString);
+            }
+            logger.info("Run type: {}", mode);
+            switch (mode) {
+                case LOCAL:
+                    logger.info("Starting local database...");
+                    databaseManager = new SqliteDatabaseManager(config);
+                    break;
+                case SERVER:
+                    throw new Exception("Server mode not yet implemented");
+                default:
+            }
+            databaseManager.init();
+            actionManager = new DelegateActionManager();
+            actionManager.start();
+            ipcManager = new IPCManager(config,actionManager);
             ipcManager.init();
 
             // TODO: Start application services
@@ -51,6 +88,9 @@ public class MediaManagerApplication {
                     }
                 }
 
+                if (actionManager != null) {
+                    actionManager.stop();
+                }
 
                 logger.info("MediaManager Core shutdown successfully");
                 logger.info("Goodbye!");
@@ -96,4 +136,4 @@ public class MediaManagerApplication {
     public static Properties getConfig() {
         return config;
     }
-}
+}

src/main/java/com/mediamanager/service/database/DatabaseManager.java

@@ -1,55 +1,28 @@
 package com.mediamanager.service.database;
+
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 import java.sql.Connection;
-import java.sql.DriverManager;
 import java.sql.SQLException;
 import java.sql.Statement;
 import java.util.Properties;
 
+public abstract class DatabaseManager {
+    protected final Properties configuration;
+    protected Connection connection;
+    protected static final Logger logger = LogManager.getLogger(DatabaseManager.class);
 
-public class DatabaseManager {
-    private final Properties configuration;
-    private Connection connection;
-    private static final Logger logger = LogManager.getLogger(DatabaseManager.class);
     public DatabaseManager(Properties config) {
         this.configuration = config;
         logger.debug("DatabaseManager created with configuration:");
-
     }
 
-    public void init() throws Exception {
-        logger.info("Initializing database connection...");
-        validateConfiguration();
+    public abstract void init() throws Exception;
 
-        String databaseType = configuration.getProperty("database.type");
-        String databaseUrl = configuration.getProperty("database.url");
-        String databaseUsername = configuration.getProperty("database.username");
-        String databasePassword = configuration.getProperty("database.password");
-        String databasePort = configuration.getProperty("database.port");
-        String databaseName = configuration.getProperty("database.name");
+    protected abstract Connection createConnection() throws Exception;
 
-
-        String connectionString = String.format("jdbc:postgresql://%s:%s/%s", databaseUrl, databasePort, databaseName);
-        logger.debug("Attempting to connect to: {}", connectionString);
-        try {
-            connection = DriverManager.getConnection(connectionString, databaseUsername, databasePassword);
-            logger.info("Database connection established successfully");
-
-            performSanityChecks();
-            logger.info("Database sanity checks passed successfully");
-
-
-        } catch (SQLException e) {
-            logger.error("Failed to connect to database", e);
-            throw new Exception("Database connection failed: " + e.getMessage(), e);
-        }
-
-
-
-    }
-    private void performSanityChecks() throws SQLException {
+    protected void performSanityChecks() throws SQLException {
         logger.debug("Performing sanity checks...");
         try (Statement stmt = connection.createStatement()) {
             stmt.execute("SELECT 1");
@@ -59,27 +32,6 @@ public class DatabaseManager {
         String databaseProductVersion = connection.getMetaData().getDatabaseProductVersion();
         logger.info("Connected to database: {} v{}", databaseProductName, databaseProductVersion);
     }
-    private void validateConfiguration() throws Exception {
-        String[] requiredProperties = {
-                "database.url",
-                "database.username",
-                "database.password",
-                "database.port",
-                "database.name"
-        };
-
-        for (String property : requiredProperties) {
-            if (configuration.getProperty(property) == null ||
-                    configuration.getProperty(property).trim().isEmpty()) {
-                throw new Exception("Required database configuration missing: " + property);
-            }
-        }
-
-        logger.debug("Database configuration validated successfully");
-
-        }
-
-
 
     public Connection getConnection() {
         return connection;
@@ -98,4 +50,13 @@ public class DatabaseManager {
             logger.debug("No database connection to close");
         }
     }
-}
+    protected boolean testConnection() {
+        try (Statement stmt = connection.createStatement()) {
+            stmt.execute("SELECT 1");
+            return true;
+        } catch (SQLException e) {
+            logger.error("Connection test failed", e);
+            return false;
+        }
+    }
+}

src/main/java/com/mediamanager/service/database/SqliteDatabaseManager.java

@@ -0,0 +1,97 @@
+package com.mediamanager.service.database;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.Properties;
+
+public class SqliteDatabaseManager extends DatabaseManager {
+    private static final Logger logger = LogManager.getLogger(SqliteDatabaseManager.class);
+
+
+    private String connectionUrl;
+
+    public SqliteDatabaseManager(Properties config) {
+        super(config);
+    }
+
+        @Override
+        public void init() throws Exception {
+
+            logger.info("Initializing SQLite database...");
+            String dataDir = configuration.getProperty("database.dir",
+                    System.getProperty("user.home") + "/.mediamanager/db");
+            String dbFilename = configuration.getProperty("database.filename", "mediamanager.db");
+            String driverClassName = configuration.getProperty("database.driver", "org.sqlite.JDBC");
+            try {
+                Class.forName(driverClassName);
+            }catch(ClassNotFoundException e) {
+                logger.error("Failed to load SQLite driver", e);
+                throw e;
+            }
+            Path dataPath = Paths.get(dataDir);
+            if (!Files.exists(dataPath)) {
+                Files.createDirectories(dataPath);
+                logger.debug("Created database directory: {}", dataDir);
+            }
+            Path dbFile = dataPath.resolve(dbFilename);
+            this.connectionUrl = "jdbc:sqlite:" + dbFile.toAbsolutePath().toString();
+            logger.info("Database file path: {}", dbFile);
+            logger.info("Connection URL: {}", this.connectionUrl);
+            this.connection = createConnection();
+            configurePerformancePragmas();
+            performSanityChecks();
+            ensureSchemaExists();
+            logger.info("SQLite database initialized successfully");
+
+    }
+
+    @Override
+    protected Connection createConnection() throws Exception {
+        try {
+            // O driver org.xerial.sqlite-jdbc é carregado automaticamente aqui
+            Connection conn = DriverManager.getConnection(this.connectionUrl);
+            logger.debug("Got connection to SQLite file");
+            return conn;
+        } catch (SQLException e) {
+            logger.error("Failed to create SQLite connection", e);
+            throw new Exception("SQLite connection failed: " + e.getMessage(), e);
+        }
+    }
+
+
+    private void configurePerformancePragmas() throws SQLException {
+        try (Statement stmt = connection.createStatement()) {
+
+            stmt.execute("PRAGMA journal_mode=WAL;");
+
+
+            stmt.execute("PRAGMA foreign_keys=ON;");
+
+
+            stmt.execute("PRAGMA synchronous=NORMAL;");
+
+            stmt.execute("PRAGMA busy_timeout=5000;");
+
+            logger.debug("SQLite performance PRAGMAs applied (WAL, Synchronous, ForeignKeys).");
+        }
+    }
+
+    private void ensureSchemaExists() throws SQLException {
+
+    }
+
+    @Override
+    public void close() {
+
+        super.close();
+        logger.info("SQLite resources released.");
+    }
+}

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

@@ -0,0 +1,11 @@
+package com.mediamanager.service.delegate;
+
+import com.google.protobuf.ByteString;
+import com.google.protobuf.InvalidProtocolBufferException;
+import com.mediamanager.protocol.TransportProtocol;
+
+@FunctionalInterface
+public interface ActionHandler {
+    TransportProtocol.Response.Builder handle(ByteString requestPayload) throws InvalidProtocolBufferException;
+}
+

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

@@ -0,0 +1,60 @@
+package com.mediamanager.service.delegate;
+
+import com.google.protobuf.ByteString;
+import com.mediamanager.protocol.TransportProtocol;
+import com.mediamanager.service.delegate.handler.EchoHandler;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class DelegateActionManager {
+    private static final Logger logger = LogManager.getLogger(DelegateActionManager.class);
+    
+    private final Map<String, ActionHandler> handlerRegistry;
+    
+    public DelegateActionManager() {
+        
+        logger.debug("DelegateActionManager created");
+        this.handlerRegistry = new HashMap<>();
+        registerHandlers();
+    }
+
+    private void registerHandlers() {
+        handlerRegistry.put("echo",new EchoHandler());
+    }
+
+    public void start(){
+        logger.info("DelegateActionManager started");
+    }
+
+    public void stop(){
+        logger.info("DelegateActionManager stopped");
+    }
+
+    public TransportProtocol.Response ProcessedRequest(TransportProtocol.Request request){
+        String requestId = request.getRequestId();
+        logger.info("Processing request: {}", requestId);
+        String action = request.getHeadersMap().getOrDefault("action", "unknown");
+        ActionHandler handler = handlerRegistry.get(action);
+        TransportProtocol.Response.Builder responseBuilder;
+        if (handler == null) {
+            logger.warn("No handler found for action: {}", action);
+            responseBuilder = TransportProtocol.Response.newBuilder()
+                    .setStatusCode(404) // 404 Not Found
+                    .setPayload(ByteString.copyFromUtf8("Error: Action '" + action + "' not found."));
+        } else{
+            try {
+                logger.debug("Delegating action '{}' to handler...", action);
+                responseBuilder = handler.handle(request.getPayload());
+            }catch (Exception e) {
+                logger.error("Handler for action '{}' threw an exception:", action, e);
+                responseBuilder = TransportProtocol.Response.newBuilder()
+                        .setStatusCode(500) // 500 Internal Server Error
+                        .setPayload(ByteString.copyFromUtf8("Error: " + e.getMessage()));
+            }
+        }
+            return responseBuilder.setRequestId(requestId).build();
+    }
+}

src/main/java/com/mediamanager/service/delegate/handler/EchoHandler.java

@@ -0,0 +1,17 @@
+package com.mediamanager.service.delegate.handler;
+
+import com.google.protobuf.ByteString;
+import com.mediamanager.protocol.TransportProtocol;
+import com.mediamanager.service.delegate.ActionHandler;
+
+public class EchoHandler implements ActionHandler {
+    @Override
+    public TransportProtocol.Response.Builder handle(ByteString requestPayload) {
+        String payloadText = requestPayload.toStringUtf8();
+        String responseText = "Server received: " + payloadText;
+
+        return TransportProtocol.Response.newBuilder()
+                .setPayload(ByteString.copyFromUtf8(responseText))
+                .setStatusCode(200);
+    }
+}

src/main/java/com/mediamanager/service/ipc/IPCManager.java

@@ -1,10 +1,11 @@
 package com.mediamanager.service.ipc;
 
-
+import com.mediamanager.protocol.TransportProtocol;
+import com.mediamanager.service.delegate.DelegateActionManager;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
-import java.io.File;
+
 import java.io.IOException;
 import java.net.StandardProtocolFamily;
 import java.net.UnixDomainSocketAddress;
@@ -26,6 +27,8 @@ import java.util.concurrent.atomic.AtomicInteger;
 public class IPCManager {
     private final Properties configuration;
     private static final Logger logger = LogManager.getLogger(IPCManager.class);
+    private final DelegateActionManager actionManager;
+
     private Path socketPath;
     private UnixDomainSocketAddress socketAddress;
     private ServerSocketChannel serverChannel;
@@ -35,8 +38,9 @@ public class IPCManager {
     private final AtomicInteger clientIdCounter = new AtomicInteger(0);
 
 
-    public IPCManager(Properties config){
+    public IPCManager(Properties config, DelegateActionManager actionManager){
         configuration = config;
+        this.actionManager = actionManager;
         logger.debug("IPCManager created with configuration:");
 
 
@@ -219,24 +223,25 @@ public class IPCManager {
             logger.debug("Client {} handler thread started", clientId);
 
             try {
-                // TODO: No próximo passo, vamos implementar:
-                // 1. Ler mensagens JSON do SocketChannel
-                // 2. Parsear o JSON para objetos Java
-                // 3. Processar a requisição
-                // 4. Criar uma resposta JSON
-                // 5. Escrever a resposta de volta no SocketChannel
+                TransportProtocol.Request request = readRequest(channel);
 
-                // Por enquanto, apenas mantém a conexão aberta brevemente
-                // para testar que o sistema de aceitação e threads está funcionando
-                Thread.sleep(100);
+                if (request != null) {
+                    logger.info("Client {} sent request {}", clientId, request.getRequestId());
 
-                logger.debug("Client {} processing complete", clientId);
+                    // Processa usando o DelegateActionManager
+                    TransportProtocol.Response response = actionManager.ProcessedRequest(request);
+
+                    // Envia resposta de volta
+                    writeResponse(channel, response);
+
+                    logger.info("Client {} response sent", clientId);
+                } else {
+                    logger.warn("Client {} sent null message", clientId);
+                }
 
             } catch (Exception e) {
                 logger.error("Error handling client {}", clientId, e);
             } finally {
-                // SEMPRE fecha o canal quando terminar
-                // O finally garante que isso acontece mesmo se houver exceção
                 try {
                     channel.close();
                     logger.debug("Client {} channel closed", clientId);
@@ -245,6 +250,67 @@ public class IPCManager {
                 }
             }
         }
+        private TransportProtocol.Request readRequest(SocketChannel channel) throws IOException {
+            // Primeiro, lê o tamanho da mensagem (4 bytes = int32)
+            java.nio.ByteBuffer sizeBuffer = java.nio.ByteBuffer.allocate(4);
+            int bytesRead = 0;
+
+            while (bytesRead < 4) {
+                int read = channel.read(sizeBuffer);
+                if (read == -1) {
+                    logger.debug("Client disconnected before sending size");
+                    return null;
+                }
+                bytesRead += read;
+            }
+
+            sizeBuffer.flip();
+            int messageSize = sizeBuffer.getInt();
+            logger.debug("Expecting message of {} bytes", messageSize);
+
+            // Validação básica de segurança
+            if (messageSize <= 0 || messageSize > 1024 * 1024) { // Max 1MB
+                throw new IOException("Invalid message size: " + messageSize);
+            }
+
+            // Agora lê a mensagem completa
+            java.nio.ByteBuffer messageBuffer = java.nio.ByteBuffer.allocate(messageSize);
+            bytesRead = 0;
+
+            while (bytesRead < messageSize) {
+                int read = channel.read(messageBuffer);
+                if (read == -1) {
+                    throw new IOException("Client disconnected while reading message");
+                }
+                bytesRead += read;
+            }
+
+            messageBuffer.flip();
+
+            // Deserializa o Protocol Buffers
+            byte[] messageBytes = new byte[messageSize];
+            messageBuffer.get(messageBytes);
+
+            return TransportProtocol.Request.parseFrom(messageBytes);
+        }
+
+        private void writeResponse(SocketChannel channel, TransportProtocol.Response response) throws IOException {
+            byte[] messageBytes = response.toByteArray();
+            int messageSize = messageBytes.length;
+
+            logger.debug("Writing response of {} bytes", messageSize);
+
+            java.nio.ByteBuffer buffer = java.nio.ByteBuffer.allocate(4 + messageSize);
+            buffer.putInt(messageSize);
+            buffer.put(messageBytes);
+            buffer.flip();
+
+            while (buffer.hasRemaining()) {
+                channel.write(buffer);
+            }
+
+            logger.debug("Response written successfully");
+        }
     }
 }
 

src/main/proto/messages.proto

@@ -0,0 +1,19 @@
+syntax = "proto3";
+
+option java_package = "com.mediamanager.protocol";
+option java_outer_classname = "TransportProtocol";
+
+package mediamanager;
+
+message Request {
+  string request_id = 1;
+  bytes payload = 2;
+  map<string, string> headers = 3;
+}
+
+message Response {
+  string request_id = 1;
+  int32 status_code = 2;
+  bytes payload = 3;
+  map<string, string> headers = 4;
+}

src/main/resources/config.properties.example

@@ -21,6 +21,8 @@ hibernate.format_sql=true
 ipc.pipe.name=mediamanager-pipe
 ipc.pipe.path=/tmp/mediamanager
 ipc.buffer.size=8192
-
+runtype=local
 ipc.socket.path=/tmp/mediamanager
 
+
+