Github user vrozov commented on a diff in the pull request:
https://github.com/apache/apex-malhar/pull/279#discussion_r68249862
--- Diff:
library/src/main/java/com/datatorrent/lib/bandwidth/BandwidthPartitioner.java
---
@@ -0,0 +1,78 @@
+/**
+ * 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;
+
+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)
+ {
+ LOG.info("Updating bandwidth of partitions.");
--- End diff --
There is already logging in `setBandwidth()` method that is called for
every partition from `updateBandwidth()`.
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