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, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 019package org.apache.hadoop.yarn.sharedcache; 020 021import java.io.IOException; 022import java.io.InputStream; 023 024import org.apache.hadoop.classification.InterfaceAudience.Public; 025import org.apache.hadoop.classification.InterfaceStability.Evolving; 026 027@Public 028@Evolving 029/** 030 * An interface to calculate a checksum for a resource in the shared cache. The 031 * checksum implementation should be thread safe. 032 */ 033public interface SharedCacheChecksum { 034 035 /** 036 * Calculate the checksum of the passed input stream. 037 * 038 * @param in <code>InputStream</code> to be checksumed 039 * @return the message digest of the input stream 040 * @throws IOException 041 */ 042 public String computeChecksum(InputStream in) throws IOException; 043}