| /* |
| * 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.optimizer; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.flink.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 identifier The identifier which may be later used to retrieve the statistics. |
| */ |
| public void cacheBaseStatistics(BaseStatistics statistics, String identifier) { |
| synchronized (this.baseStatisticsCache) { |
| this.baseStatisticsCache.put(identifier, statistics); |
| } |
| } |
| } |