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Interface for nodes from 2 different containers to talk to each other.
/**
* 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.bufferserver.policy;
import java.util.Set;
import com.datatorrent.bufferserver.internal.PhysicalNode;
import com.datatorrent.bufferserver.util.SerializedData;
/**
*
* Implements load balancing by sending the tuple to the least busy partition.
* Basic load balancing policy. Extends the base class {@link AbstractPolicy}
*
* @since 0.3.2
*/
public class LeastBusy extends AbstractPolicy
{
static final LeastBusy instance = new LeastBusy();
/**
*
* @return {@link com.datatorrent.bufferserver.policy.LeastBusy}
*/
public static LeastBusy getInstance()
{
return instance;
}
/**
* Constructor
*/
private LeastBusy()
{
}
@Override
public boolean distribute(Set nodes, SerializedData data) throws InterruptedException
{
PhysicalNode theOne = null;
for (PhysicalNode node: nodes) {
if (theOne == null || node.getProcessedMessageCount() < theOne.getProcessedMessageCount()) {
theOne = node;
}
}
return theOne == null ? false : theOne.send(data);
}
}