| /* |
| * 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.felix.mosgi.jmx.rmiconnector.mx4j.remote; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| |
| /** |
| * |
| * @author <a href="mailto:biorn_steedom@users.sourceforge.net">Simone Bordet</a> |
| * @version $Revision: 1.1.1.1 $ |
| */ |
| public abstract class AbstractHeartBeat implements HeartBeat, Runnable |
| { |
| private final ConnectionNotificationEmitter emitter; |
| private long pulsePeriod; |
| private int maxRetries; |
| private Thread thread; |
| private volatile boolean stopped; |
| |
| protected AbstractHeartBeat(ConnectionNotificationEmitter emitter, Map environment) |
| { |
| this.emitter = emitter; |
| if (environment != null) |
| { |
| try |
| { |
| pulsePeriod = ((Long)environment.get(MX4JRemoteConstants.CONNECTION_HEARTBEAT_PERIOD)).longValue(); |
| } |
| catch (Exception ignored) |
| { |
| } |
| try |
| { |
| maxRetries = ((Integer)environment.get(MX4JRemoteConstants.CONNECTION_HEARTBEAT_RETRIES)).intValue(); |
| } |
| catch (Exception ignored) |
| { |
| } |
| } |
| if (pulsePeriod <= 0) pulsePeriod = 5000; |
| if (maxRetries <= 0) maxRetries = 3; |
| } |
| |
| protected abstract void pulse() throws IOException; |
| |
| public void start() throws IOException |
| { |
| thread = new Thread(this, "Connection HeartBeat"); |
| thread.setDaemon(true); |
| thread.start(); |
| } |
| |
| public void stop() throws IOException |
| { |
| if (stopped) return; |
| stopped = true; |
| thread.interrupt(); |
| } |
| |
| public void run() |
| { |
| int retries = 0; |
| while (!stopped && !thread.isInterrupted()) |
| { |
| try |
| { |
| Thread.sleep(pulsePeriod); |
| |
| try |
| { |
| pulse(); |
| retries = 0; |
| } |
| catch (IOException x) |
| { |
| if (retries++ == maxRetries) |
| { |
| // The connection has died |
| sendConnectionNotificationFailed(); |
| // And go on |
| } |
| } |
| } |
| catch (InterruptedException x) |
| { |
| Thread.currentThread().interrupt(); |
| return; |
| } |
| } |
| } |
| |
| protected void sendConnectionNotificationFailed() |
| { |
| emitter.sendConnectionNotificationFailed(); |
| } |
| } |