Question

我有一个基于jetty的工作WebSocket服务器，我需要迁移才能使用Atmosphere。我需要将传入的WebSockets消息写入内部队列以进行后续处理，并将原始消息作为事务的肯定确认返回给客户端。

我已经使用Atmosphere的WebSocketProtocol API实现了。连接成功启动，并从客户端向服务器发送单个消息。但是，没有收到任何响应，似乎连接已关闭。

以下是连接请求的日志消息：

INFO  [2015-05-19 14:46:08,222] org.eclipse.jetty.server.ServerConnector: Started application@1db9d253{HTTP/1.1}{0.0.0.0:9090}
INFO  [2015-05-19 14:46:08,236] org.eclipse.jetty.server.ServerConnector: Started admin@6f5f892c{HTTP/1.1}{0.0.0.0:8081}
INFO  [2015-05-19 14:46:08,237] org.eclipse.jetty.server.Server: Started @15902ms
INFO  [2015-05-19 14:46:08,344] com.df.sensoringest.services.SensorIngestServiceIntegrationTest: Connecting to: ws://localhost:9090/dF/sensorIngest
127.0.0.1 - - [19/May/2015:14:46:08 +0000] "GET /dF/sensorIngest HTTP/1.1" 101 - "-" "-"  259
INFO  [2015-05-19 14:46:09,014] com.df.sensoringest.services.SensorIngestServiceIntegrationTest: Connected: WebSocketSession[websocket=JettyListenerEventDriver[com.df.sensoringest.services.SensorIngestServiceIntegrationTest$TestClient],behavior=CLIENT,connection=WebSocketClientConnection@79056e19{IDLE}{f=Flusher[queueSize=0,aggregateSize=0,failure=null],g=Generator[CLIENT,validating],p=Parser@2b100b71[ExtensionStack,s=START,c=0,len=0,f=null,p=WebSocketPolicy@6c4a33a4[behavior=CLIENT,maxTextMessageSize=65536,maxTextMessageBufferSize=32768,maxBinaryMessageSize=65536,maxBinaryMessageBufferSize=32768,asyncWriteTimeout=60000,idleTimeout=300000,inputBufferSize=4096]]},remote=WebSocketRemoteEndpoint@432bf2ff[batching=true],incoming=JettyListenerEventDriver[com.df.sensoringest.services.SensorIngestServiceIntegrationTest$TestClient],outgoing=ExtensionStack[queueSize=0,extensions=[],incoming=org.eclipse.jetty.websocket.common.WebSocketSession,outgoing=org.eclipse.jetty.websocket.client.io.WebSocketClientConnection]]
INFO  [2015-05-19 14:46:09,032] com.df.sensoringest.resources.socket.SocketResource: connection requested: 4c3b4254-a3bc-4a1f-900b-3b8ad9b9afc6

建立连接后，我发送一条由WebSocket服务器接收的消息：

INFO  [2015-05-19 14:46:16,015] com.df.sensoringest.services.SensorIngestServiceIntegrationTest: sending: This is a test message
INFO  [2015-05-19 14:46:16,035] com.df.sensoringest.resources.socket.SocketResource: received: This is a test message
INFO  [2015-05-19 14:46:16,352] com.df.sensoringest.resources.socket.SocketResource: connection closed: 4c3b4254-a3bc-4a1f-900b-3b8ad9b9afc6

客户端从未收到响应，并且连接已关闭。没有例外被抛出，所以我不确定发生了什么。

这是WebSocket服务器代码：

@Slf4j
@WebSocketProtocolService
public class SocketResource implements WebSocketProtocol {

  @Override
  public List<AtmosphereRequest> onMessage(WebSocket webSocket, String data) {
    log.info("received: {}", data);
    webSocket.resource().getBroadcaster().broadcast(data);
    return null;
  }

  @Override
  public List<AtmosphereRequest>
      onMessage(WebSocket webSocket, byte[] data, int offset, int length) {
    try {
      String bStr = new String(data, "UTF-8");
      log.info("received unexpected byte message: {}", bStr);
    } catch (UnsupportedEncodingException e) {
      log.error("unsupported text encoding: {}", e);
    }
    return null;
  }

  @Override
  public void configure(AtmosphereConfig config) {
    log.info("config method called");
  }

  @Override
  public void onOpen(WebSocket webSocket) {
    log.info("connection requested: {}", webSocket.resource().uuid());
  }

  @Override
  public void onClose(WebSocket webSocket) {
    log.info("connection closed: {}", webSocket.resource().uuid());
  }

  @Override
  public void onError(WebSocket webSocket, WebSocketProcessor.WebSocketException t) {
    log.error("websocket error: {}", t.getMessage());
    log.error("status {}, message {}", t.response().getStatus(), t.response().getStatusMessage());
  }
}

这是测试客户端：

  /**
   * The Test WebSockets Client
   */
  public static class TestClient extends WebSocketAdapter {
    @Override
    public void onWebSocketClose(int statusCode, String reason) {
      log.error("websocket session closed: {}, {}", statusCode, reason);
    }

    @Override
    public void onWebSocketConnect(Session session) {
      log.info("Connected: {}", session);
      try {
        Thread.sleep((long)(5 * DateTimeConstants.MILLIS_PER_SECOND));
      } catch (Exception e) {
        log.error("sleep interrupted ...", e);
      }

      try {
        log.info("sending: {}", sensorMessage);
        session.getRemote().sendString(sensorMessage);
      } catch (Exception e) {
        log.error("error sending message: {}", e);
      }
    }

    @Override
    public void onWebSocketError(Throwable cause) {
      log.info("unexpected websockets exception: {}", cause);
    }

    @Override
    public void onWebSocketBinary(byte[] payload, int offset, int len) {
      log.info("unexpected binary message received");
    }

    @Override
    public void onWebSocketText(String message) {
      if (message != null) {
        response = message;
        log.info("websocket response received: {}", message);
      }
    }
  }

所以，在所有这些之后，我做错了什么或者没做什么导致连接关闭以及广播回客户端失败？

Answer 1

我没有在我的onOpen（）方法中设置广播器。在这样做之后，在我的onMessage（）方法中获得广播者，我现在得到了我在客户端中寻找的响应。

这是新的套接字资源代码：

/**
 * Example resource to show integration of Atmosphere within Dropwizard.
 */
@Slf4j
@WebSocketProtocolService
public class SocketResource implements WebSocketProtocol {

  @Inject
  private BroadcasterFactory factory;

  private int requestCount = 1;

  @Override
  public List<AtmosphereRequest> onMessage(WebSocket webSocket, String data) {
    Broadcaster b = webSocket.resource().getBroadcaster();
    b.broadcast(data);
    log.info("broadcaster: {}", b);
    log.info("received: {}", data);
    return null;
  }

  @Override
  public List<AtmosphereRequest>
      onMessage(WebSocket webSocket, byte[] data, int offset, int length) {
    try {
      String bStr = new String(data, "UTF-8");
      log.info("received unexpected byte message: {}", bStr);
    } catch (UnsupportedEncodingException e) {
      log.error("unsupported text encoding: {}", e);
    }
    return null;
  }

  @Override
  public void configure(AtmosphereConfig config) {
    log.info("config method called");
  }

  @Override
  public void onOpen(WebSocket webSocket) {
    log.info("connection requested: {}", webSocket.resource().uuid());
    webSocket.resource().setBroadcaster(factory.lookup("/sensorIngest/" +
        requestCount++, true)).suspend(-1);
  }

  @Override
  public void onClose(WebSocket webSocket) {
    log.info("connection closed: {}", webSocket.resource().uuid());
  }

  @Override
  public void onError(WebSocket webSocket, WebSocketProcessor.WebSocketException t) {
    log.error("websocket error: {}", t.getMessage());
    log.error("status {}, message {}", t.response().getStatus(), t.response().getStatusMessage());
  }

我愿意接受改进，因为我对Atmosphere很新。我还没想到的一件事是如何将服务器响应仅发送给一个客户端。

Atmosphere WebSocketProtocol Broadcast

1 个答案: