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/**
 * 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); } }




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