/*
* 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.config;
import com.dangdang.ddframe.job.exception.JobConfigurationException;
import com.dangdang.ddframe.job.exception.JobExecutionEnvironmentException;
import com.dangdang.ddframe.job.lite.config.LiteJobConfiguration;
import com.dangdang.ddframe.job.lite.internal.storage.JobNodeStorage;
import com.dangdang.ddframe.job.reg.base.CoordinatorRegistryCenter;
import com.dangdang.ddframe.job.util.env.TimeService;
import com.google.common.base.Optional;
/**
* 弹性化分布式作业配置服务.
*
* @author zhangliang
* @author caohao
*/
public final class ConfigurationService {
private final TimeService timeService;
private final JobNodeStorage jobNodeStorage;
public ConfigurationService(final CoordinatorRegistryCenter regCenter, final String jobName) {
jobNodeStorage = new JobNodeStorage(regCenter, jobName);
timeService = new TimeService();
}
/**
* 读取作业配置.
*
* @param fromCache 是否从缓存中读取
* @return 作业配置
*/
public LiteJobConfiguration load(final boolean fromCache) {
String result;
if (fromCache) {
result = jobNodeStorage.getJobNodeData(ConfigurationNode.ROOT);
if (null == result) {
result = jobNodeStorage.getJobNodeDataDirectly(ConfigurationNode.ROOT);
}
} else {
result = jobNodeStorage.getJobNodeDataDirectly(ConfigurationNode.ROOT);
}
return LiteJobConfigurationGsonFactory.fromJson(result);
}
/**
* 持久化分布式作业配置信息.
*
* @param liteJobConfig 作业配置
*/
public void persist(final LiteJobConfiguration liteJobConfig) {
checkConflictJob(liteJobConfig);
if (!jobNodeStorage.isJobNodeExisted(ConfigurationNode.ROOT) || liteJobConfig.isOverwrite()) {
jobNodeStorage.replaceJobNode(ConfigurationNode.ROOT, LiteJobConfigurationGsonFactory.toJson(liteJobConfig));
}
}
private void checkConflictJob(final LiteJobConfiguration liteJobConfig) {
Optional<LiteJobConfiguration> liteJobConfigFromZk = find();
if (liteJobConfigFromZk.isPresent() && !liteJobConfigFromZk.get().getTypeConfig().getJobClass().equals(liteJobConfig.getTypeConfig().getJobClass())) {
throw new JobConfigurationException("Job conflict with register center. The job '%s' in register center's class is '%s', your job class is '%s'",
liteJobConfig.getJobName(), liteJobConfigFromZk.get().getTypeConfig().getJobClass(), liteJobConfig.getTypeConfig().getJobClass());
}
}
private Optional<LiteJobConfiguration> find() {
if (!jobNodeStorage.isJobNodeExisted(ConfigurationNode.ROOT)) {
return Optional.absent();
}
LiteJobConfiguration result = LiteJobConfigurationGsonFactory.fromJson(jobNodeStorage.getJobNodeDataDirectly(ConfigurationNode.ROOT));
if (null == result) {
// TODO 应该删除整个job node,并非仅仅删除config node
jobNodeStorage.removeJobNodeIfExisted(ConfigurationNode.ROOT);
}
return Optional.fromNullable(result);
}
/**
* 检查本机与注册中心的时间误差秒数是否在允许范围.
*
* @throws JobExecutionEnvironmentException 本机与注册中心的时间误差秒数不在允许范围所抛出的异常
*/
public void checkMaxTimeDiffSecondsTolerable() throws JobExecutionEnvironmentException {
int maxTimeDiffSeconds = load(true).getMaxTimeDiffSeconds();
if (-1 == maxTimeDiffSeconds) {
return;
}
long timeDiff = Math.abs(timeService.getCurrentMillis() - jobNodeStorage.getRegistryCenterTime());
if (timeDiff > maxTimeDiffSeconds * 1000L) {
throw new JobExecutionEnvironmentException(
"Time different between job server and register center exceed '%s' seconds, max time different is '%s' seconds.", timeDiff / 1000, maxTimeDiffSeconds);
}
}
}