001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019/**
020 *
021 */
022package org.apache.reef.io;
023
024import org.apache.reef.annotations.Unstable;
025import org.apache.reef.exception.evaluator.ServiceException;
026
027/**
028 * A basic Accumulator interface.
029 *
030 * @param <T> the type of the datums accumulated
031 */
032@Unstable
033public interface Accumulator<T> extends AutoCloseable {
034
035  /**
036   * Add the given datum to this.
037   *
038   * @param datum the datum to be added
039   * @throws ServiceException
040   */
041  void add(final T datum) throws ServiceException;
042
043  @Override
044  void close() throws ServiceException;
045}