dubbo AbstractTimerTask 源码
dubbo AbstractTimerTask 代码
文件路径：/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/exchange/support/header/AbstractTimerTask.java
/*
* 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.dubbo.remoting.exchange.support.header;
import org.apache.dubbo.common.timer.Timeout;
import org.apache.dubbo.common.timer.Timer;
import org.apache.dubbo.common.timer.TimerTask;
import org.apache.dubbo.remoting.Channel;
import java.util.Collection;
import java.util.concurrent.TimeUnit;
/**
* AbstractTimerTask
*/
public abstract class AbstractTimerTask implements TimerTask {
private final ChannelProvider channelProvider;
private final Long tick;
protected volatile boolean cancel = false;
AbstractTimerTask(ChannelProvider channelProvider, Long tick) {
if (channelProvider == null || tick == null) {
throw new IllegalArgumentException();
}
this.tick = tick;
this.channelProvider = channelProvider;
}
static Long lastRead(Channel channel) {
return (Long) channel.getAttribute(HeartbeatHandler.KEY_READ_TIMESTAMP);
}
static Long lastWrite(Channel channel) {
return (Long) channel.getAttribute(HeartbeatHandler.KEY_WRITE_TIMESTAMP);
}
static Long now() {
return System.currentTimeMillis();
}
public void cancel() {
this.cancel = true;
}
private void reput(Timeout timeout, Long tick) {
if (timeout == null || tick == null) {
throw new IllegalArgumentException();
}
if (cancel) {
return;
}
Timer timer = timeout.timer();
if (timer.isStop() || timeout.isCancelled()) {
return;
}
timer.newTimeout(timeout.task(), tick, TimeUnit.MILLISECONDS);
}
@Override
public void run(Timeout timeout) throws Exception {
Collection<Channel> c = channelProvider.getChannels();
for (Channel channel : c) {
if (channel.isClosed()) {
continue;
}
doTask(channel);
}
reput(timeout, tick);
}
protected abstract void doTask(Channel channel);
interface ChannelProvider {
Collection<Channel> getChannels();
}
}
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