/**
* Copyright 2013-2014 Recruit Technologies Co., Ltd. and contributors
* (see CONTRIBUTORS.md)
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License. A copy of the
* License is distributed with this work in the LICENSE.md file. You may
* also obtain a copy of the License from
*
* 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 org.gennai.gungnir.topology.grouping;
import static org.gennai.gungnir.GungnirConst.*;
import java.util.List;
import java.util.Random;
import backtype.storm.generated.GlobalStreamId;
import backtype.storm.task.WorkerTopologyContext;
import com.google.common.collect.Lists;
public class ShuffleGrouping extends BaseGrouping {
private static final long serialVersionUID = SERIAL_VERSION_UID;
private List<Integer> targetTasks;
private Random random;
@Override
public void prepare(WorkerTopologyContext context, GlobalStreamId stream,
List<Integer> targetTasks) {
this.targetTasks = targetTasks;
random = new Random();
}
@Override
public List<Integer> chooseTasks(int taskId, List<Object> values) {
List<Integer> tasks = Lists.newArrayListWithCapacity(1);
tasks.add(targetTasks.get(random.nextInt(targetTasks.size())));
return tasks;
}
@Override
public int hashCode() {
return 1;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
return true;
}
@Override
public String toString() {
return "shuffle grouping";
}
}