Add `CloseHandler` to support graceful connection termination.

- Extend `test.proto` with `CloseCommand` and `CloseResponse` messages.
- Introduce `CloseHandler` to process "close" actions and respond with connection termination notice.
- Update `DelegateActionManager` to register `CloseHandler`.
- Refactor `IPCManager` to handle "close" response headers and terminate client connections gracefully.

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

@@ -2,6 +2,7 @@ package com.mediamanager.service.delegate;
 
 import com.google.protobuf.ByteString;
 import com.mediamanager.protocol.TransportProtocol;
+import com.mediamanager.service.delegate.handler.CloseHandler;
 import com.mediamanager.service.delegate.handler.EchoHandler;
 import com.mediamanager.service.delegate.handler.HeartbeatHandler;
 import org.apache.logging.log4j.LogManager;
@@ -25,6 +26,7 @@ public class DelegateActionManager {
     private void registerHandlers() {
         handlerRegistry.put("echo",new EchoHandler());
         handlerRegistry.put("heartbeat",new HeartbeatHandler());
+        handlerRegistry.put("close", new CloseHandler());
     }
 
     public void start(){

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

@@ -0,0 +1,32 @@
+package com.mediamanager.service.delegate.handler;
+
+import com.google.protobuf.ByteString;
+import com.google.protobuf.InvalidProtocolBufferException;
+import com.mediamanager.protocol.TestProtocol.CloseCommand;
+import com.mediamanager.protocol.TestProtocol.CloseResponse;
+import com.mediamanager.protocol.TransportProtocol;
+import com.mediamanager.service.delegate.ActionHandler;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+public class CloseHandler implements ActionHandler {
+    private static final Logger logger = LogManager.getLogger(CloseHandler.class);
+
+    @Override
+    public TransportProtocol.Response.Builder handle(ByteString requestPayload)
+            throws InvalidProtocolBufferException {
+
+        CloseCommand.parseFrom(requestPayload); // Valida
+
+        logger.info("Close command received - connection will close");
+
+        CloseResponse response = CloseResponse.newBuilder()
+                .setMessage("Connection closing. Goodbye!")
+                .build();
+
+        return TransportProtocol.Response.newBuilder()
+                .setPayload(ByteString.copyFrom(response.toByteArray()))
+                .setStatusCode(200)
+                .putHeaders("Connection", "close"); // ← Marca para fechar
+    }
+}

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

@@ -33,7 +33,7 @@ public class EchoHandler implements ActionHandler {
         // 4. Retorna Response
         return TransportProtocol.Response.newBuilder()
                 .setPayload(responsePayload)
-                .setStatusCode(200)
-                .putHeaders("Content-Type", "application/x-protobuf");
+                .setStatusCode(200);
+
     }
 }

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

@@ -30,7 +30,7 @@ public class HeartbeatHandler implements ActionHandler {
 
         return TransportProtocol.Response.newBuilder()
                 .setPayload(ByteString.copyFrom(response.toByteArray()))
-                .setStatusCode(200)
-                .putHeaders("Content-Type", "application/x-protobuf");
+                .setStatusCode(200);
+
     }
 }

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

@@ -223,9 +223,16 @@ public class IPCManager {
             logger.debug("Client {} handler thread started", clientId);
 
             try {
+                // LOOP: processa múltiplas requests na mesma conexão
+                while (channel.isOpen()) {
                     TransportProtocol.Request request = readRequest(channel);
 
-                if (request != null) {
+                    if (request == null) {
+                        // Cliente desconectou gracefully
+                        logger.info("Client {} disconnected (end of stream)", clientId);
+                        break;
+                    }
+
                     logger.info("Client {} sent request {}", clientId, request.getRequestId());
 
                     // Processa usando o DelegateActionManager
@@ -233,17 +240,29 @@ public class IPCManager {
 
                     // Envia resposta de volta
                     writeResponse(channel, response);
-
                     logger.info("Client {} response sent", clientId);
-                } else {
-                    logger.warn("Client {} sent null message", clientId);
+
+                    // Verifica se é comando CLOSE
+                    String connectionHeader = response.getHeadersOrDefault("Connection", "");
+                    if ("close".equals(connectionHeader)) {
+                        logger.info("Client {} requested connection close", clientId);
+                        break; // Sai do loop e fecha
+                    }
                 }
 
+            } catch (IOException e) {
+                if (channel.isOpen()) {
+                    logger.error("IO error handling client {}", clientId, e);
+                } else {
+                    logger.debug("Client {} connection closed by peer", clientId);
+                }
             } catch (Exception e) {
-                logger.error("Error handling client {}", clientId, e);
+                logger.error("Unexpected error handling client {}", clientId, e);
             } finally {
                 try {
+                    if (channel.isOpen()) {
                         channel.close();
+                    }
                     logger.debug("Client {} channel closed", clientId);
                 } catch (IOException e) {
                     logger.error("Error closing client {} channel", clientId, e);

src/main/proto/test.proto

@@ -22,3 +22,9 @@ message HeartbeatResponse {
   int64 client_timestamp = 1;
   int64 server_timestamp = 2;
 }
+message CloseCommand {
+  // Vazio - apenas sinaliza fechamento
+}
+message CloseResponse {
+  string message = 1;
+}