dubbo HeartbeatTimerTask 源码
dubbo HeartbeatTimerTask 代码
文件路径：/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/exchange/support/header/HeartbeatTimerTask.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.Version;
import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.remoting.Channel;
import org.apache.dubbo.remoting.exchange.Request;
import static org.apache.dubbo.common.constants.CommonConstants.HEARTBEAT_EVENT;
/**
* HeartbeatTimerTask
*/
public class HeartbeatTimerTask extends AbstractTimerTask {
private static final Logger logger = LoggerFactory.getLogger(HeartbeatTimerTask.class);
private final int heartbeat;
HeartbeatTimerTask(ChannelProvider channelProvider, Long heartbeatTick, int heartbeat) {
super(channelProvider, heartbeatTick);
this.heartbeat = heartbeat;
}
@Override
protected void doTask(Channel channel) {
try {
Long lastRead = lastRead(channel);
Long lastWrite = lastWrite(channel);
Long now = now();
if ((lastRead != null && now - lastRead > heartbeat)
|| (lastWrite != null && now - lastWrite > heartbeat)) {
Request req = new Request();
req.setVersion(Version.getProtocolVersion());
req.setTwoWay(true);
req.setEvent(HEARTBEAT_EVENT);
channel.send(req);
if (logger.isDebugEnabled()) {
logger.debug("Send heartbeat to remote channel " + channel.getRemoteAddress()
+ ", cause: The channel has no data-transmission exceeds a heartbeat period: "
+ heartbeat + "ms");
}
}
} catch (Throwable t) {
logger.warn("Exception when heartbeat to remote channel " + channel.getRemoteAddress(), t);
}
}
}
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