sample.websocket.WebSocketDisconnectHandler.java Source code

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Here is the source code for sample.websocket.WebSocketDisconnectHandler.java

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/*
 * Copyright 2014-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package sample.websocket;

import java.util.Arrays;

import sample.data.ActiveWebSocketUser;
import sample.data.ActiveWebSocketUserRepository;

import org.springframework.context.ApplicationListener;
import org.springframework.messaging.simp.SimpMessageSendingOperations;
import org.springframework.web.socket.messaging.SessionDisconnectEvent;

public class WebSocketDisconnectHandler<S> implements ApplicationListener<SessionDisconnectEvent> {
    private ActiveWebSocketUserRepository repository;
    private SimpMessageSendingOperations messagingTemplate;

    public WebSocketDisconnectHandler(SimpMessageSendingOperations messagingTemplate,
            ActiveWebSocketUserRepository repository) {
        super();
        this.messagingTemplate = messagingTemplate;
        this.repository = repository;
    }

    public void onApplicationEvent(SessionDisconnectEvent event) {
        String id = event.getSessionId();
        if (id == null) {
            return;
        }
        ActiveWebSocketUser user = this.repository.findOne(id);
        if (user == null) {
            return;
        }

        this.repository.delete(id);
        this.messagingTemplate.convertAndSend("/topic/friends/signout", Arrays.asList(user.getUsername()));

    }
}