/*
* 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.sharding;
import com.dangdang.ddframe.job.lite.internal.config.ConfigurationNode;
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.server.ServerNode;
import com.dangdang.ddframe.job.reg.base.CoordinatorRegistryCenter;
import org.apache.curator.framework.recipes.cache.TreeCacheEvent.Type;
/**
* 分片监听管理器.
*
* @author zhangliang
*/
public final class ShardingListenerManager extends AbstractListenerManager {
private final String jobName;
private final ConfigurationNode configNode;
private final InstanceNode instanceNode;
private final ServerNode serverNode;
private final ShardingService shardingService;
public ShardingListenerManager(final CoordinatorRegistryCenter regCenter, final String jobName) {
super(regCenter, jobName);
this.jobName = jobName;
configNode = new ConfigurationNode(jobName);
instanceNode = new InstanceNode(jobName);
serverNode = new ServerNode(jobName);
shardingService = new ShardingService(regCenter, jobName);
}
@Override
public void start() {
addDataListener(new ShardingTotalCountChangedJobListener());
addDataListener(new ListenServersChangedJobListener());
}
class ShardingTotalCountChangedJobListener extends AbstractJobListener {
@Override
protected void dataChanged(final String path, final Type eventType, final String data) {
if (configNode.isConfigPath(path) && 0 != JobRegistry.getInstance().getCurrentShardingTotalCount(jobName)) {
int newShardingTotalCount = LiteJobConfigurationGsonFactory.fromJson(data).getTypeConfig().getCoreConfig().getShardingTotalCount();
if (newShardingTotalCount != JobRegistry.getInstance().getCurrentShardingTotalCount(jobName)) {
shardingService.setReshardingFlag();
JobRegistry.getInstance().setCurrentShardingTotalCount(jobName, newShardingTotalCount);
}
}
}
}
class ListenServersChangedJobListener extends AbstractJobListener {
@Override
protected void dataChanged(final String path, final Type eventType, final String data) {
if (!JobRegistry.getInstance().isShutdown(jobName) && (isInstanceChange(eventType, path) || isServerChange(path))) {
shardingService.setReshardingFlag();
}
}
private boolean isInstanceChange(final Type eventType, final String path) {
return instanceNode.isInstancePath(path) && Type.NODE_UPDATED != eventType;
}
private boolean isServerChange(final String path) {
return serverNode.isServerPath(path);
}
}
}