/*
* Copyright 1999-2015 dangdang.com.
* <p>
* 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.
* </p>
*/
package com.dangdang.ddframe.job.lite.internal.failover;
import com.dangdang.ddframe.job.lite.config.LiteJobConfiguration;
import com.dangdang.ddframe.job.lite.internal.config.ConfigurationNode;
import com.dangdang.ddframe.job.lite.internal.config.ConfigurationService;
import com.dangdang.ddframe.job.lite.internal.config.LiteJobConfigurationGsonFactory;
import com.dangdang.ddframe.job.lite.internal.instance.InstanceNode;
import com.dangdang.ddframe.job.lite.internal.listener.AbstractJobListener;
import com.dangdang.ddframe.job.lite.internal.listener.AbstractListenerManager;
import com.dangdang.ddframe.job.lite.internal.schedule.JobRegistry;
import com.dangdang.ddframe.job.lite.internal.sharding.ShardingService;
import com.dangdang.ddframe.job.reg.base.CoordinatorRegistryCenter;
import org.apache.curator.framework.recipes.cache.TreeCacheEvent.Type;
import java.util.List;
/**
* 失效转移监听管理器.
*
* @author zhangliang
*/
public final class FailoverListenerManager extends AbstractListenerManager {
private final String jobName;
private final ConfigurationService configService;
private final ShardingService shardingService;
private final FailoverService failoverService;
private final ConfigurationNode configNode;
private final InstanceNode instanceNode;
public FailoverListenerManager(final CoordinatorRegistryCenter regCenter, final String jobName) {
super(regCenter, jobName);
this.jobName = jobName;
configService = new ConfigurationService(regCenter, jobName);
shardingService = new ShardingService(regCenter, jobName);
failoverService = new FailoverService(regCenter, jobName);
configNode = new ConfigurationNode(jobName);
instanceNode = new InstanceNode(jobName);
}
@Override
public void start() {
addDataListener(new JobCrashedJobListener());
addDataListener(new FailoverSettingsChangedJobListener());
}
private boolean isFailoverEnabled() {
LiteJobConfiguration jobConfig = configService.load(true);
return null != jobConfig && jobConfig.isFailover();
}
class JobCrashedJobListener extends AbstractJobListener {
@Override
protected void dataChanged(final String path, final Type eventType, final String data) {
if (isFailoverEnabled() && Type.NODE_REMOVED == eventType && instanceNode.isInstancePath(path)) {
String jobInstanceId = path.substring(instanceNode.getInstanceFullPath().length() + 1);
if (jobInstanceId.equals(JobRegistry.getInstance().getJobInstance(jobName).getJobInstanceId())) {
return;
}
List<Integer> failoverItems = failoverService.getFailoverItems(jobInstanceId);
if (!failoverItems.isEmpty()) {
for (int each : failoverItems) {
failoverService.setCrashedFailoverFlag(each);
failoverService.failoverIfNecessary();
}
} else {
for (int each : shardingService.getShardingItems(jobInstanceId)) {
failoverService.setCrashedFailoverFlag(each);
failoverService.failoverIfNecessary();
}
}
}
}
}
class FailoverSettingsChangedJobListener extends AbstractJobListener {
@Override
protected void dataChanged(final String path, final Type eventType, final String data) {
if (configNode.isConfigPath(path) && Type.NODE_UPDATED == eventType && !LiteJobConfigurationGsonFactory.fromJson(data).isFailover()) {
failoverService.removeFailoverInfo();
}
}
}
}