/*
* Copyright (C) 2010-2101 Alibaba Group Holding Limited.
*
* 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.
*/
package com.alibaba.otter.shared.arbitrate.impl.setl.rpc;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.Assert;
import com.alibaba.otter.shared.arbitrate.exception.ArbitrateException;
import com.alibaba.otter.shared.arbitrate.impl.setl.ArbitrateFactory;
import com.alibaba.otter.shared.arbitrate.impl.setl.ExtractArbitrateEvent;
import com.alibaba.otter.shared.arbitrate.impl.setl.helper.StagePathUtils;
import com.alibaba.otter.shared.arbitrate.impl.setl.lb.LoadBalanceFactory;
import com.alibaba.otter.shared.arbitrate.impl.setl.monitor.PermitMonitor;
import com.alibaba.otter.shared.arbitrate.impl.zookeeper.ZooKeeperClient;
import com.alibaba.otter.shared.arbitrate.model.EtlEventData;
import com.alibaba.otter.shared.common.model.config.channel.ChannelStatus;
import com.alibaba.otter.shared.common.model.config.enums.StageType;
import com.alibaba.otter.shared.common.model.config.node.Node;
import com.alibaba.otter.shared.common.utils.zookeeper.ZkClientx;
/**
* 基于rpc方式实现的extract调度
*
* @author jianghang 2012-9-29 上午10:59:24
* @version 4.1.0
*/
public class ExtractRpcArbitrateEvent implements ExtractArbitrateEvent {
private static final Logger logger = LoggerFactory.getLogger(ExtractRpcArbitrateEvent.class);
private ZkClientx zookeeper = ZooKeeperClient.getInstance();
private RpcStageEventDispatcher rpcStageEventDispatcher;
public EtlEventData await(Long pipelineId) throws InterruptedException {
Assert.notNull(pipelineId);
PermitMonitor permitMonitor = ArbitrateFactory.getInstance(pipelineId, PermitMonitor.class);
permitMonitor.waitForPermit();// 阻塞等待授权
RpcStageController stageController = ArbitrateFactory.getInstance(pipelineId, RpcStageController.class);
Long processId = stageController.waitForProcess(StageType.EXTRACT); // 符合条件的processId
ChannelStatus status = permitMonitor.getChannelPermit();
if (status.isStart() || status.isPause()) {// pause状态也让其处理，避免误删除pause状态的processId，导致通道挂起
EtlEventData eventData = stageController.getLastData(processId);
Node node = LoadBalanceFactory.getNextTransformNode(pipelineId);// 获取下一个处理节点信息
if (node == null) {// 没有后端节点
throw new ArbitrateException("Extract_single", "no next node");
} else {
eventData.setNextNid(node.getId());
return eventData;// 只有这一条路返回
}
} else {
logger.warn("pipelineId[{}] extract ignore processId[{}] by status[{}]", new Object[] { pipelineId,
processId, status });
String path = StagePathUtils.getProcess(pipelineId, processId);
zookeeper.exists(path);
return await(pipelineId);// 递归调用
}
}
public void single(EtlEventData data) {
Assert.notNull(data);
rpcStageEventDispatcher.single(StageType.EXTRACT, data);// 通知下一个节点
}
public void setRpcStageEventDispatcher(RpcStageEventDispatcher rpcStageEventDispatcher) {
this.rpcStageEventDispatcher = rpcStageEventDispatcher;
}
}