/*
* 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.KeyPredicate;
import com.hazelcast.mapreduce.impl.AbstractJobTracker;
import com.hazelcast.mapreduce.impl.MapReduceDataSerializerHook;
import com.hazelcast.mapreduce.impl.MapReduceService;
import com.hazelcast.mapreduce.impl.task.JobSupervisor;
import com.hazelcast.mapreduce.impl.task.KeyValueSourceMappingPhase;
import com.hazelcast.mapreduce.impl.task.MappingPhase;
import com.hazelcast.mapreduce.impl.task.TrackableJobFuture;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.IdentifiedDataSerializable;
import com.hazelcast.spi.AbstractOperation;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.concurrent.CancellationException;
/**
* This operation is used to start the actual processing after all node prepared to execute the map reduce job
*
* @param <K> type of the key
*/
public class StartProcessingJobOperation<K>
extends AbstractOperation
implements IdentifiedDataSerializable {
private String name;
private Collection<K> keys;
private String jobId;
private KeyPredicate<K> predicate;
public StartProcessingJobOperation() {
}
public StartProcessingJobOperation(String name, String jobId, Collection<K> keys, KeyPredicate<K> predicate) {
this.name = name;
this.keys = keys;
this.jobId = jobId;
this.predicate = predicate;
}
@Override
public boolean returnsResponse() {
return false;
}
@Override
public String getServiceName() {
return MapReduceService.SERVICE_NAME;
}
@Override
public void run()
throws Exception {
MapReduceService mapReduceService = getService();
JobSupervisor supervisor = mapReduceService.getJobSupervisor(name, jobId);
if (supervisor == null) {
if (mapReduceService.unregisterJobSupervisorCancellation(name, jobId)) {
// Supervisor was cancelled prior to creation
AbstractJobTracker jobTracker = (AbstractJobTracker) mapReduceService.getJobTracker(name);
TrackableJobFuture future = jobTracker.unregisterTrackableJob(jobId);
if (future != null) {
Exception exception = new CancellationException("Operation was cancelled by the user");
future.setResult(exception);
}
}
return;
}
MappingPhase mappingPhase = new KeyValueSourceMappingPhase(keys, predicate);
supervisor.startTasks(mappingPhase);
}
@Override
public void writeInternal(ObjectDataOutput out)
throws IOException {
out.writeUTF(name);
out.writeUTF(jobId);
out.writeInt(keys == null ? 0 : keys.size());
if (keys != null) {
for (Object key : keys) {
out.writeObject(key);
}
}
out.writeObject(predicate);
}
@Override
public void readInternal(ObjectDataInput in)
throws IOException {
name = in.readUTF();
jobId = in.readUTF();
int size = in.readInt();
keys = new ArrayList<K>();
for (int i = 0; i < size; i++) {
keys.add((K) in.readObject());
}
predicate = in.readObject();
}
@Override
public int getFactoryId() {
return MapReduceDataSerializerHook.F_ID;
}
@Override
public int getId() {
return MapReduceDataSerializerHook.START_PROCESSING_OPERATION;
}
}