/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 org.apache.zeppelin.notebook.repo.zeppelinhub.websocket.scheduler; import org.apache.zeppelin.notebook.repo.zeppelinhub.model.UserTokenContainer; import org.apache.zeppelin.notebook.repo.zeppelinhub.websocket.ZeppelinhubClient; import org.apache.zeppelin.notebook.repo.zeppelinhub.websocket.utils.ZeppelinhubUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * Routine that send PING event to zeppelinhub. * */ public class ZeppelinHubHeartbeat implements Runnable { private static final Logger LOG = LoggerFactory.getLogger(ZeppelinHubHeartbeat.class); private ZeppelinhubClient client; public static ZeppelinHubHeartbeat newInstance(ZeppelinhubClient client) { return new ZeppelinHubHeartbeat(client); } private ZeppelinHubHeartbeat(ZeppelinhubClient client) { this.client = client; } @Override public void run() { LOG.debug("Sending PING to zeppelinhub token"); for (String token: UserTokenContainer.getInstance().getAllTokens()) { client.send(ZeppelinhubUtils.pingMessage(token), token); } } }