/*
* Copyright (c) 2008-2013, Hazelcast, Inc. All Rights Reserved.
*
* 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.hazelcast.mapreduce.impl.operation;
import com.hazelcast.mapreduce.JobPartitionState;
import com.hazelcast.mapreduce.impl.MapReduceDataSerializerHook;
import com.hazelcast.mapreduce.impl.MapReduceService;
import com.hazelcast.mapreduce.impl.task.JobProcessInformationImpl;
import com.hazelcast.mapreduce.impl.task.JobSupervisor;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import java.io.IOException;
import static com.hazelcast.mapreduce.impl.operation.RequestPartitionResult.ResultState.CHECK_STATE_FAILED;
import static com.hazelcast.mapreduce.impl.operation.RequestPartitionResult.ResultState.NO_SUPERVISOR;
import static com.hazelcast.mapreduce.impl.operation.RequestPartitionResult.ResultState.SUCCESSFUL;
/**
* This operation is used to tell the job owner to postpone a mapping phase for the defined
* partitionId. This can happen if the partitionId might not yet be assigned to any cluster
* members.
*/
public class PostPonePartitionProcessing
extends ProcessingOperation {
private volatile RequestPartitionResult result;
private int partitionId;
public PostPonePartitionProcessing() {
}
public PostPonePartitionProcessing(String name, String jobId, int partitionId) {
super(name, jobId);
this.partitionId = partitionId;
}
@Override
public Object getResponse() {
return result;
}
@Override
public void run()
throws Exception {
MapReduceService mapReduceService = getService();
JobSupervisor supervisor = mapReduceService.getJobSupervisor(getName(), getJobId());
if (supervisor == null) {
result = new RequestPartitionResult(NO_SUPERVISOR, -1);
return;
}
JobProcessInformationImpl processInformation = supervisor.getJobProcessInformation();
while (true) {
JobPartitionState[] partitionStates = processInformation.getPartitionStates();
JobPartitionState oldPartitionState = partitionStates[partitionId];
if (oldPartitionState == null || !getCallerAddress().equals(oldPartitionState.getOwner())) {
result = new RequestPartitionResult(CHECK_STATE_FAILED, partitionId);
return;
}
if (processInformation.updatePartitionState(partitionId, oldPartitionState, null)) {
result = new RequestPartitionResult(SUCCESSFUL, partitionId);
return;
}
}
}
@Override
protected void writeInternal(ObjectDataOutput out)
throws IOException {
super.writeInternal(out);
out.writeInt(partitionId);
}
@Override
protected void readInternal(ObjectDataInput in)
throws IOException {
super.readInternal(in);
partitionId = in.readInt();
}
@Override
public int getFactoryId() {
return MapReduceDataSerializerHook.F_ID;
}
@Override
public int getId() {
return MapReduceDataSerializerHook.POSTPONE_PARTITION_PROCESSING_OPERATION;
}
}