| /** |
| * 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.bandwidth; |
| |
| import java.util.Collection; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.datatorrent.common.partitioner.StatelessPartitioner; |
| |
| /** |
| * @since 3.5.0 |
| */ |
| public class BandwidthPartitioner<T extends BandwidthLimitingOperator> extends StatelessPartitioner<T> |
| { |
| private static final long serialVersionUID = -7502505996637650237L; |
| private static final Logger LOG = LoggerFactory.getLogger(BandwidthPartitioner.class); |
| |
| /** |
| * This creates a partitioner which creates only one partition. |
| */ |
| public BandwidthPartitioner() |
| { |
| } |
| |
| /** |
| * 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 create |
| */ |
| public BandwidthPartitioner(String value) |
| { |
| super(value); |
| } |
| |
| /** |
| * This creates a partitioner which creates partitonCount partitions. |
| * |
| * @param partitionCount The number of partitions to create. |
| */ |
| public BandwidthPartitioner(int partitionCount) |
| { |
| super(partitionCount); |
| } |
| |
| @Override |
| public Collection<Partition<T>> definePartitions(Collection<Partition<T>> partitions, PartitioningContext context) |
| { |
| long currentBandwidth = partitions.iterator().next().getPartitionedInstance().getBandwidthManager().getBandwidth() |
| * partitions.size(); |
| Collection<Partition<T>> newpartitions = super.definePartitions(partitions, context); |
| return updateBandwidth(newpartitions, currentBandwidth); |
| } |
| |
| public Collection<Partition<T>> updateBandwidth(Collection<Partition<T>> newpartitions, long currentBandwidth) |
| { |
| long newBandwidth = currentBandwidth / newpartitions.size(); |
| for (Partition<T> partition : newpartitions) { |
| partition.getPartitionedInstance().getBandwidthManager().setBandwidth(newBandwidth); |
| } |
| LOG.info("Updating bandwidth of partitions to value: " + newBandwidth); |
| return newpartitions; |
| } |
| } |