/***********************************************************************************************************************
* 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.compiler;
import java.util.HashMap;
import java.util.Map;
import eu.stratosphere.api.common.io.statistics.BaseStatistics;
/**
* The collection of access methods that can be used to retrieve statistical information about the
* data processed in a job. Currently this method acts as an entry point only for obtaining cached
* statistics.
*/
public class DataStatistics {
private final Map<String, BaseStatistics> baseStatisticsCache;
// --------------------------------------------------------------------------------------------
/**
* Creates a new statistics object, with an empty cache.
*/
public DataStatistics() {
this.baseStatisticsCache = new HashMap<String, BaseStatistics>();
}
// --------------------------------------------------------------------------------------------
/**
* Gets the base statistics for the input identified by the given identifier.
*
* @param inputIdentifier The identifier for the input.
* @return The statistics that were cached for this input.
*/
public BaseStatistics getBaseStatistics(String inputIdentifier) {
synchronized (this.baseStatisticsCache) {
return this.baseStatisticsCache.get(inputIdentifier);
}
}
/**
* Caches the given statistics. They are later retrievable under the given identifier.
*
* @param statistics The statistics to cache.
* @param identifyer The identifier which may be later used to retrieve the statistics.
*/
public void cacheBaseStatistics(BaseStatistics statistics, String identifyer) {
synchronized (this.baseStatisticsCache) {
this.baseStatisticsCache.put(identifyer, statistics);
}
}
}