/**
* 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.mahout.fpm.pfpgrowth.convertors;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapreduce.Reducer;
/**
* Updates the Context object of a {@link Reducer} class
*
* @param <IK>
* @param <IV>
* @param <K>
* @param <V>
*/
public class ContextStatusUpdater<IK extends Writable,IV extends Writable,K extends Writable,V extends Writable>
implements StatusUpdater {
private static final long PERIOD = 10000; // Update every 10 seconds
private final Reducer<IK,IV,K,V>.Context context;
private long time = System.currentTimeMillis();
public ContextStatusUpdater(Reducer<IK,IV,K,V>.Context context) {
this.context = context;
}
@Override
public void update(String status) {
long curTime = System.currentTimeMillis();
if (curTime - time > PERIOD && context != null) {
time = curTime;
context.setStatus("Processing FPTree: " + status);
}
}
}