SocketClientRunnable.java

/*--
 * #%L
 * Cognifide Actions
 * %%
 * Copyright (C) 2015 Cognifide
 * %%
 * 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.
 * #L%
 */

package com.cognifide.actions.msg.websocket.client;

import com.cognifide.actions.msg.websocket.api.SocketReceiver;
import com.cognifide.actions.msg.websocket.servlet.MessageWebsocketServlet;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Set;
import javax.websocket.DeploymentException;
import javax.websocket.Endpoint;
import javax.websocket.EndpointConfig;
import javax.websocket.MessageHandler;
import javax.websocket.Session;

import org.apache.commons.lang.StringUtils;
import org.glassfish.tyrus.client.ClientManager;
import org.glassfish.tyrus.client.ClientProperties;
import org.glassfish.tyrus.client.auth.Credentials;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SocketClientRunnable extends Endpoint implements Runnable {

	private static final Logger LOG = LoggerFactory.getLogger(SocketClientRunnable.class);

	private final Set<SocketReceiver> receivers;

	private final String serverUrl;

	private final ClientManager client;

	private Session session;

	private volatile boolean shouldStop = false;

	public SocketClientRunnable(Set<SocketReceiver> receivers, String serverUrl, String username,
								String password) throws URISyntaxException {
		this.receivers = receivers;
		this.serverUrl = serverUrl.replace("http://", "ws://") + MessageWebsocketServlet.PATH;
		client = ClientManager.createClient();
		String clientUsername = StringUtils.defaultIfEmpty(username, "admin");
		String clientPassword = StringUtils.defaultIfEmpty(password, "admin");
		client.getProperties()
				.put(ClientProperties.CREDENTIALS, new Credentials(clientUsername, clientPassword));
	}

	@Override
	public void onOpen(final Session session, EndpointConfig endpointConfig) {
		LOG.info("Session {} opened", session.getId());
		this.session = session;
		session.addMessageHandler(new MessageHandler.Whole<String>() {
			@Override
			public void onMessage(String message) {
				LOG.debug("Got message: " + message);
				gotMessage(message);
				try {
					session.getBasicRemote().sendText("OK");
				} catch (IOException e) {
					LOG.error("Can't respond to the message");
				}
			}
		});
	}

	@Override
	public void run() {
		reconnect();
		while (!shouldStop) {
			if (connectionBroken()) {
				String sessionId = session != null ? session.getId() : null;
				LOG.debug("Connection was lost... session: {} no longer active", sessionId);
				reconnect();
			}
			try {
				Thread.sleep(10000);
			} catch (InterruptedException e1) {
				LOG.error("Interrupted", e1);
				return;
			}
		}
	}

	public void stop() {
		shouldStop = true;
		closeSession();
	}

	private boolean connectionBroken() {
		return session == null || !session.isOpen();
	}

	private void reconnect() {
		closeSession();
		try {
			LOG.debug("Connecting to server: `{}` (receivers no: {})", serverUrl, receivers.size());
			final Session currentSession = client.connectToServer(this, new URI(serverUrl));
			LOG.debug("New session created: ", currentSession.getId());
		} catch (IOException | DeploymentException | URISyntaxException e) {
			LOG.error("Can't connect to the server {}", serverUrl, e);
		}
	}

	private void closeSession() {
		String sessionId = session != null ? session.getId() : null;
		LOG.info("Closing session: {}", sessionId);
		if (session != null) {
			try {
				session.close();
			} catch (IOException e) {
				LOG.error("Can't close session", e);
			}
		}
	}

	protected void gotMessage(String message) {
		for (SocketReceiver receiver : receivers) {
			receiver.gotMessage(message);
		}
	}

}