| /* |
| * 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.api.common.accumulators; |
| |
| import java.io.Serializable; |
| import java.util.Collections; |
| import java.util.Map; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| /** |
| * Accumulator registry encapsulates user-defined accumulators. |
| */ |
| public abstract class AbstractAccumulatorRegistry { |
| /* User-defined accumulator values stored for the executing task. */ |
| protected final Map<String, Accumulator<?, ?>> userAccumulators = |
| new ConcurrentHashMap<>(4); |
| |
| /** |
| * Adds an ordinary accumulator. |
| */ |
| public <V, A extends Serializable> void addAccumulator(String name, Accumulator<V, A> accumulator) { |
| if (userAccumulators.containsKey(name)) { |
| throw new UnsupportedOperationException("The accumulator '" + name |
| + "' already exists and cannot be added."); |
| } |
| |
| userAccumulators.put(name, accumulator); |
| } |
| |
| /** |
| * Gets all the user-defined accumulators. |
| */ |
| public Map<String, Accumulator<?, ?>> getAccumulators() { |
| return Collections.unmodifiableMap(userAccumulators); |
| } |
| |
| /** |
| * Adds a pre-aggregated accumulator. |
| */ |
| public abstract <V, A extends Serializable> void addPreAggregatedAccumulator(String name, Accumulator<V, A> accumulator); |
| |
| /** |
| * Gets all the uncommitted pre-aggregated accumulators. |
| */ |
| public abstract Map<String, Accumulator<?, ?>> getPreAggregatedAccumulators(); |
| |
| /** |
| * Commits a pre-aggregated accumulator with the specific name. |
| */ |
| public abstract void commitPreAggregatedAccumulator(String name); |
| |
| /** |
| * Queries a pre-aggregated accumulator with the specific name asynchronously. |
| */ |
| public abstract <V, A extends Serializable> CompletableFuture<Accumulator<V, A>> queryPreAggregatedAccumulator(String name); |
| } |