| /* |
| * 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.slider.server.services.utility; |
| |
| import org.apache.hadoop.service.AbstractService; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A service that calls the supplied callback when it is started -after the |
| * given delay, then stops itself. |
| * Because it calls in on a different thread, it can be used for callbacks |
| * that don't |
| */ |
| public class EventNotifyingService extends AbstractService implements Runnable { |
| protected static final Logger log = |
| LoggerFactory.getLogger(EventNotifyingService.class); |
| private final EventCallback callback; |
| private final int delay; |
| |
| public EventNotifyingService(EventCallback callback, int delay) { |
| super("EventNotifyingService"); |
| assert callback != null; |
| this.callback = callback; |
| this.delay = delay; |
| } |
| |
| @Override |
| protected void serviceStart() throws Exception { |
| log.debug("Notifying {} after a delay of {} millis", callback, delay); |
| new Thread(this, "event").start(); |
| } |
| |
| @Override |
| public void run() { |
| if (delay > 0) { |
| try { |
| Thread.sleep(delay); |
| } catch (InterruptedException e) { |
| |
| } |
| } |
| log.debug("Notifying {}", callback); |
| callback.eventCallbackEvent(); |
| stop(); |
| } |
| } |