/*********************************************************************************************************************** * Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu) * * Licensed 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 eu.stratosphere.pact.runtime.iterative.convergence; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import eu.stratosphere.api.common.aggregators.ConvergenceCriterion; import eu.stratosphere.types.LongValue; /** * A workset iteration is by definition converged if no records have been updated in the solutionset */ public class WorksetEmptyConvergenceCriterion implements ConvergenceCriterion<LongValue> { private static final Log log = LogFactory.getLog(WorksetEmptyConvergenceCriterion.class); public static final String AGGREGATOR_NAME = "pact.runtime.workset-empty-aggregator"; @Override public boolean isConverged(int iteration, LongValue value) { long updatedElements = value.getValue(); if (log.isInfoEnabled()) { log.info("[" + updatedElements + "] elements updated in the solutionset in iteration [" + iteration + "]"); } return updatedElements == 0; } }