/*
* 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 org.apache.flink.runtime.iterative.convergence;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.flink.api.common.aggregators.ConvergenceCriterion;
import org.apache.flink.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 long serialVersionUID = 1L;
private static final Logger log = LoggerFactory.getLogger(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;
}
}