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
020package org.apache.commons.compress.parallel;
021
022import java.io.InputStream;
023
024/**
025 * Supplies input streams.
026 *
027 * Implementations are required to support thread-handover. While an instance will not be accessed concurrently by multiple threads, it will be called by a
028 * different thread than it was created on.
029 *
030 * @since 1.10
031 */
032public interface InputStreamSupplier {
033
034    /**
035     * Supplies an input stream for a resource.
036     *
037     * @return the input stream. Should never be null, but may be an empty stream.
038     */
039    InputStream get();
040}