/* | |
* Copyright 1999-2012 Alibaba Group. | |
* | |
* 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 com.alibaba.dubbo.examples.callback.impl; | |
import java.text.SimpleDateFormat; | |
import java.util.Date; | |
import java.util.Map; | |
import java.util.concurrent.ConcurrentHashMap; | |
import com.alibaba.dubbo.examples.callback.api.CallbackListener; | |
import com.alibaba.dubbo.examples.callback.api.CallbackService; | |
/** | |
* CallbackServiceImpl | |
* | |
* @author william.liangf | |
*/ | |
public class CallbackServiceImpl implements CallbackService { | |
private final Map<String, CallbackListener> listeners = new ConcurrentHashMap<String, CallbackListener>(); | |
public CallbackServiceImpl() { | |
Thread t = new Thread(new Runnable() { | |
public void run() { | |
while(true) { | |
try { | |
for(Map.Entry<String, CallbackListener> entry : listeners.entrySet()){ | |
try { | |
entry.getValue().changed(getChanged(entry.getKey())); | |
} catch (Throwable t) { | |
listeners.remove(entry.getKey()); | |
} | |
} | |
Thread.sleep(5000); // 定时触发变更通知 | |
} catch (Throwable t) { // 防御容错 | |
t.printStackTrace(); | |
} | |
} | |
} | |
}); | |
t.setDaemon(true); | |
t.start(); | |
} | |
public void addListener(String key, CallbackListener listener) { | |
listeners.put(key, listener); | |
listener.changed(getChanged(key)); // 发送变更通知 | |
} | |
private String getChanged(String key) { | |
return "Changed: " + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()); | |
} | |
} |