java会话管理Jetty Websocket服务器
当在一个websocket中接收消息时，请将此消息转发给其他连接的websocket。我使用jetty-9.2.20。v20161216
所以我初始化了服务器
JettyWSServer websocketServer = new JettyWSServer("localhost", 8000, new MySocketHandler(), new QueuedThreadPool(128));
public <T extends WebSocketHandler> JettyWSServer(String hostName, int port, T webscoketHandler, QueuedThreadPool threadPool) {
this.hostName = hostName;
this.port = port;
this.handler = webscoketHandler;
this.threadPool = threadPool;
this.socket = null;
//create server
this.server = new Server(this.threadPool);
//set connector
ServerConnector connector = new ServerConnector(server);
connector.setHost(this.hostName);
connector.setPort(this.port);
this.server.addConnector(connector);
//set handler
this.server.setHandler(this.handler);
//set listener
setLifecycleListener();
}
MySocketHandler。java
public class MySocketHandler extends WebSocketHandler {
private final String TAG = MySocketHandler.class.getSimpleName();
private MySocketCreator creator;
@Override
public void configure(WebSocketServletFactory webSocketServletFactory) {
this.creator = new MySocketCreator();
webSocketServletFactory.setCreator(this.creator);
}
public Set<ServerSocket> getSockets(){
return this.creator.getSockets();
}
}
MySocketCreator。java
public class MySocketCreator implements WebSocketCreator {
private static final String TAG = MySocketCreator.class.getSimpleName();
private static Log log = new Log(TAG, true);
private Set<ServerSocket> sockets = new HashSet<>();
private Set<Session> guests = new HashSet<>();
private ConcurrentHashMap<ServiceUser, ArrayList<WSDeviceSessionWrapper>> users = new ConcurrentHashMap<>();
@Override
public Object createWebSocket(ServletUpgradeRequest servletUpgradeRequest, ServletUpgradeResponse servletUpgradeResponse) {
ServerSocket socket = new ServerSocket(statusCallback);
sockets.add(socket);
return socket;
}
private OnSessionStatusListener statusCallback = new OnSessionStatusListener() {
@Override
public void onGuestIn(Session session) {
synchronized (this) {
guests.add(session);
Integer totalAgeReduce = users.values()
.stream()
.map(wsDeviceSessionWrappers -> {
return 1;
})
.reduce(
0,
(a, b) -> a + b);
log.debug("onGuestIn() " + "Guests: " + guests.size() + " Registered: " + totalAgeReduce);
}
}
@Override
public void onUserIn(Session session, ServiceUser user, Device device) {
synchronized (this) {
if (guests.contains(session)) guests.remove(session);
if (!users.containsKey(user)) {
users.put(user, new ArrayList<WSDeviceSessionWrapper>());
}
users.get(user).add(new WSDeviceSessionWrapper(session, device));
log.debug("onUserIn() " + "Guests: " + guests.size() + " Registered: " + users.size());
}
}
@Override
public void sendResponse(ArrayList<ServiceUser> users, WSResponse response) {
log.debug("Send message to [" + (users != null ? users.size() : null) + "] current users " + MySocketCreator.this.users.size());
MySocketCreator.this.users.keySet().forEach(user -> {
users.forEach(u -> {
if (user.equals(u)) {
ArrayList<WSDeviceSessionWrapper> wsDeviceSessionWrappers = MySocketCreator.this.users.get(user);
new ArrayList<>(wsDeviceSessionWrappers).forEach(wrapper -> {
wrapper.getSession().getRemote().sendStringByFuture(response.toJSON());
}
});
}
});
});
}
@Override
public void sendResponse(ServiceUser user, WSResponse response, Device excludeDevice) {
MySocketCreator.this.users.get(user).forEach(wrapper -> {
wrapper.getSession().getRemote().sendStringByFuture(response.toJSON());
});
}
@Override
public void onExit(Session session, ServiceUser user, Device device) {
synchronized (this) {
//remove from guest sessions
if (session != null && guests.contains(session)) guests.remove(session);
if (user != null && device != null && users.containsKey(user)) {
ArrayList<WSDeviceSessionWrapper> wrappers = users.get(user);
Iterator<WSDeviceSessionWrapper> iterator = wrappers.iterator();
while (iterator.hasNext()) {
WSDeviceSessionWrapper wrapper = iterator.next();
if (wrapper.getSession() == session || wrapper.getSession().equals(session) && wrapper.getDevice() == device || wrapper.getDevice().equals(device)) {
//remove session for current device
iterator.remove();
//if user does not have session on server
//remove him from current server users
if (wrappers.size() == 0) {
users.remove(user);
}
}
}
}
Integer totalRegisteredDevices = users.values()
.stream()
.map(wsDeviceSessionWrappers -> {
return 1;
})
.reduce(
0,
(a, b) -> a + b);
log.debug("onExit() " + "Guests: " + guests.size() + " Registered: " + totalRegisteredDevices);
}
}
};
public Set<ServerSocket> getSockets() {
return sockets;
}
}
此代码的逻辑：
在MySocketCreator类中，当创建新socket时，我将传递给callback。接下来在事件onOpen的socket中，我调用回调并将会话传递给它，会话存储在MySocketCreator类中，在此会话之后，我与用户和设备关联
问题是，当我试图通过回调方法从任何websocket向所有用户发送消息时
@Override
public void sendResponse(ArrayList<ServiceUser> users, WSResponse response) {
log.debug("Send message to [" + (users != null ? users.size() : null) + "] current users " + MySocketCreator.this.users.size());
MySocketCreator.this.users.keySet().forEach(user -> {
users.forEach(u -> {
if (user.equals(u)) {
ArrayList<WSDeviceSessionWrapper> wsDeviceSessionWrappers = MySocketCreator.this.users.get(user);
new ArrayList<>(wsDeviceSessionWrappers).forEach(wrapper -> {
wrapper.getSession().getRemote().sendStringByFuture(response.toJSON());
}
});
}
});
});
}
字符串wrapper.getSession().getRemote().sendStringByFuture(response.toJSON());
锁定线程，服务器不再工作。试图替换它
wrapper.getSession().getRemote().sendString(response.toJSON());
抛出异常
java.lang.IllegalStateException: Blocking message pending 10000 for BLOCKING
org.eclipse.jetty.websocket.api.WebSocketException: RemoteEndpoint unavailable, outgoing connection not open
这两个选项不适用于300个连接/
问题：如何向所有用户发送消息
# 1 楼答案
您不能盲目地向所有用户发送消息
如果一些用户很拥挤，阅读速度不如其他用户，该怎么办
如果一个用户生成消息的速度快于您最慢的用户的internet连接速度，该怎么办
在您的场景中，您必须处理返回到} ）的
sendStringByFuture()（或者^{Future，如果连接速度慢或失败，您必须将其从用户列表中删除。如果您收到的事件表示消息已发送，则您知道特定用户/客户端未被占用，可以自由地向其发送另一条消息发送消息的循环必须将每个用户/客户端的消息排队，而不是作为一个整体，但每个用户/客户端都有自己的队列
只有当已知用户在发送时未被占用时，循环才必须发送
您甚至可能需要将消息丢弃到速度非常慢的客户机，或者如果他们的队列太大，则完全断开他们的连接
是的，这很复杂，这就是为什么在websocket上构建了这么多库来实现这一点的原因
考虑使用^{} 及其WebSutoStutialStudio.
# 2 楼答案
我用多个线程在同一个远程设备上发送消息，然后得到了相同的异常
试一试