| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.datatorrent.lib.partitioner; |
| |
| import com.datatorrent.api.Operator; |
| |
| /** |
| * <p> |
| * This does the partition of the operator based on the throughput. This partitioner doesn't copy the state during the repartitioning |
| * The max and min throughput can be controlled by the properties |
| * </p> |
| * |
| * |
| * <b>Properties</b>:<br> |
| * <b>maximumEvents:</b> The maximum throughput above which the operator will be repartitioned<br> |
| * <b>minimumEvents:</b> The minimum throughput below which the operators will be merged<br> |
| * <br> |
| * |
| * @param <T> Operator type |
| * @since 1.0.2 |
| */ |
| public class StatelessThroughputBasedPartitioner<T extends Operator> extends StatsAwareStatelessPartitioner<T> |
| { |
| private static final long serialVersionUID = 201412021109L; |
| |
| private long maximumEvents; |
| private long minimumEvents; |
| |
| @Override |
| protected int getLoad(BatchedOperatorStats stats) |
| { |
| if (stats.getTuplesProcessedPSMA() > maximumEvents) { |
| return 1; |
| } |
| if (stats.getTuplesProcessedPSMA() < minimumEvents) { |
| return -1; |
| } |
| return 0; |
| } |
| |
| /** |
| * This creates a partitioner which begins with only one partition. |
| */ |
| public StatelessThroughputBasedPartitioner() |
| { |
| super(); |
| } |
| |
| /** |
| * This constructor is used to create the partitioner from a property. |
| * |
| * @param value A string which is an integer of the number of partitions to begin with |
| */ |
| public StatelessThroughputBasedPartitioner(String value) |
| { |
| super(value); |
| } |
| |
| /** |
| * This creates a partitioner which creates partitonCount partitions. |
| * |
| * @param initialPartitionCount The number of partitions to begin with. |
| */ |
| public StatelessThroughputBasedPartitioner(int initialPartitionCount) |
| { |
| super(initialPartitionCount); |
| } |
| |
| public long getMaximumEvents() |
| { |
| return maximumEvents; |
| } |
| |
| public void setMaximumEvents(long maximumEvents) |
| { |
| this.maximumEvents = maximumEvents; |
| } |
| |
| public long getMinimumEvents() |
| { |
| return minimumEvents; |
| } |
| |
| public void setMinimumEvents(long minimumEvents) |
| { |
| this.minimumEvents = minimumEvents; |
| } |
| |
| } |