/*
* 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.api.strategy.JobInstance;
import com.dangdang.ddframe.job.lite.api.strategy.JobShardingStrategy;
import com.dangdang.ddframe.job.lite.api.strategy.JobShardingStrategyFactory;
import com.dangdang.ddframe.job.lite.config.LiteJobConfiguration;
import com.dangdang.ddframe.job.lite.internal.config.ConfigurationService;
import com.dangdang.ddframe.job.lite.internal.election.LeaderService;
import com.dangdang.ddframe.job.lite.internal.instance.InstanceNode;
import com.dangdang.ddframe.job.lite.internal.instance.InstanceService;
import com.dangdang.ddframe.job.lite.internal.schedule.JobRegistry;
import com.dangdang.ddframe.job.lite.internal.server.ServerService;
import com.dangdang.ddframe.job.lite.internal.storage.JobNodePath;
import com.dangdang.ddframe.job.lite.internal.storage.JobNodeStorage;
import com.dangdang.ddframe.job.lite.internal.storage.TransactionExecutionCallback;
import com.dangdang.ddframe.job.reg.base.CoordinatorRegistryCenter;
import com.dangdang.ddframe.job.util.concurrent.BlockUtils;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.apache.curator.framework.api.transaction.CuratorTransactionFinal;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
/**
* 作业分片服务.
*
* @author zhangliang
*/
@Slf4j
public final class ShardingService {
private final String jobName;
private final JobNodeStorage jobNodeStorage;
private final LeaderService leaderService;
private final ConfigurationService configService;
private final InstanceService instanceService;
private final ServerService serverService;
private final ExecutionService executionService;
private final JobNodePath jobNodePath;
public ShardingService(final CoordinatorRegistryCenter regCenter, final String jobName) {
this.jobName = jobName;
jobNodeStorage = new JobNodeStorage(regCenter, jobName);
leaderService = new LeaderService(regCenter, jobName);
configService = new ConfigurationService(regCenter, jobName);
instanceService = new InstanceService(regCenter, jobName);
serverService = new ServerService(regCenter, jobName);
executionService = new ExecutionService(regCenter, jobName);
jobNodePath = new JobNodePath(jobName);
}
/**
* 设置需要重新分片的标记.
*/
public void setReshardingFlag() {
jobNodeStorage.createJobNodeIfNeeded(ShardingNode.NECESSARY);
}
/**
* 判断是否需要重分片.
*
* @return 是否需要重分片
*/
public boolean isNeedSharding() {
return jobNodeStorage.isJobNodeExisted(ShardingNode.NECESSARY);
}
/**
* 如果需要分片且当前节点为主节点, 则作业分片.
*
* <p>
* 如果当前无可用节点则不分片.
* </p>
*/
public void shardingIfNecessary() {
List<JobInstance> availableJobInstances = instanceService.getAvailableJobInstances();
if (!isNeedSharding() || availableJobInstances.isEmpty()) {
return;
}
if (!leaderService.isLeaderUntilBlock()) {
blockUntilShardingCompleted();
return;
}
waitingOtherJobCompleted();
LiteJobConfiguration liteJobConfig = configService.load(false);
int shardingTotalCount = liteJobConfig.getTypeConfig().getCoreConfig().getShardingTotalCount();
log.debug("Job '{}' sharding begin.", jobName);
jobNodeStorage.fillEphemeralJobNode(ShardingNode.PROCESSING, "");
resetShardingInfo(shardingTotalCount);
JobShardingStrategy jobShardingStrategy = JobShardingStrategyFactory.getStrategy(liteJobConfig.getJobShardingStrategyClass());
jobNodeStorage.executeInTransaction(new PersistShardingInfoTransactionExecutionCallback(jobShardingStrategy.sharding(availableJobInstances, jobName, shardingTotalCount)));
log.debug("Job '{}' sharding complete.", jobName);
}
private void blockUntilShardingCompleted() {
while (!leaderService.isLeaderUntilBlock() && (jobNodeStorage.isJobNodeExisted(ShardingNode.NECESSARY) || jobNodeStorage.isJobNodeExisted(ShardingNode.PROCESSING))) {
log.debug("Job '{}' sleep short time until sharding completed.", jobName);
BlockUtils.waitingShortTime();
}
}
private void waitingOtherJobCompleted() {
while (executionService.hasRunningItems()) {
log.debug("Job '{}' sleep short time until other job completed.", jobName);
BlockUtils.waitingShortTime();
}
}
private void resetShardingInfo(final int shardingTotalCount) {
for (int i = 0; i < shardingTotalCount; i++) {
jobNodeStorage.removeJobNodeIfExisted(ShardingNode.getInstanceNode(i));
jobNodeStorage.createJobNodeIfNeeded(ShardingNode.ROOT + "/" + i);
}
int actualShardingTotalCount = jobNodeStorage.getJobNodeChildrenKeys(ShardingNode.ROOT).size();
if (actualShardingTotalCount > shardingTotalCount) {
for (int i = shardingTotalCount; i < actualShardingTotalCount; i++) {
jobNodeStorage.removeJobNodeIfExisted(ShardingNode.ROOT + "/" + i);
}
}
}
/**
* 获取作业运行实例的分片项集合.
*
* @param jobInstanceId 作业运行实例主键
* @return 作业运行实例的分片项集合
*/
public List<Integer> getShardingItems(final String jobInstanceId) {
JobInstance jobInstance = new JobInstance(jobInstanceId);
if (!serverService.isAvailableServer(jobInstance.getIp())) {
return Collections.emptyList();
}
List<Integer> result = new LinkedList<>();
int shardingTotalCount = configService.load(true).getTypeConfig().getCoreConfig().getShardingTotalCount();
for (int i = 0; i < shardingTotalCount; i++) {
if (jobInstance.getJobInstanceId().equals(jobNodeStorage.getJobNodeData(ShardingNode.getInstanceNode(i)))) {
result.add(i);
}
}
return result;
}
/**
* 获取运行在本作业实例的分片项集合.
*
* @return 运行在本作业实例的分片项集合
*/
public List<Integer> getLocalShardingItems() {
if (JobRegistry.getInstance().isShutdown(jobName) || !serverService.isAvailableServer(JobRegistry.getInstance().getJobInstance(jobName).getIp())) {
return Collections.emptyList();
}
return getShardingItems(JobRegistry.getInstance().getJobInstance(jobName).getJobInstanceId());
}
/**
* 查询是包含有分片节点的不在线服务器.
*
* @return 是包含有分片节点的不在线服务器
*/
public boolean hasShardingInfoInOfflineServers() {
List<String> onlineInstances = jobNodeStorage.getJobNodeChildrenKeys(InstanceNode.ROOT);
int shardingTotalCount = configService.load(true).getTypeConfig().getCoreConfig().getShardingTotalCount();
for (int i = 0; i < shardingTotalCount; i++) {
if (!onlineInstances.contains(jobNodeStorage.getJobNodeData(ShardingNode.getInstanceNode(i)))) {
return true;
}
}
return false;
}
@RequiredArgsConstructor
class PersistShardingInfoTransactionExecutionCallback implements TransactionExecutionCallback {
private final Map<JobInstance, List<Integer>> shardingResults;
@Override
public void execute(final CuratorTransactionFinal curatorTransactionFinal) throws Exception {
for (Map.Entry<JobInstance, List<Integer>> entry : shardingResults.entrySet()) {
for (int shardingItem : entry.getValue()) {
curatorTransactionFinal.create().forPath(jobNodePath.getFullPath(ShardingNode.getInstanceNode(shardingItem)), entry.getKey().getJobInstanceId().getBytes()).and();
}
}
curatorTransactionFinal.delete().forPath(jobNodePath.getFullPath(ShardingNode.NECESSARY)).and();
curatorTransactionFinal.delete().forPath(jobNodePath.getFullPath(ShardingNode.PROCESSING)).and();
}
}
}