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.security; 020 021import java.util.Collection; 022 023import org.apache.commons.logging.Log; 024import org.apache.commons.logging.LogFactory; 025import org.apache.hadoop.classification.InterfaceAudience.Public; 026import org.apache.hadoop.classification.InterfaceStability.Stable; 027import org.apache.hadoop.io.Text; 028import org.apache.hadoop.security.token.Token; 029import org.apache.hadoop.security.token.TokenIdentifier; 030import org.apache.hadoop.security.token.TokenSelector; 031 032@Public 033@Stable 034public class ContainerTokenSelector implements 035 TokenSelector<ContainerTokenIdentifier> { 036 037 private static final Log LOG = LogFactory 038 .getLog(ContainerTokenSelector.class); 039 040 @SuppressWarnings("unchecked") 041 @Override 042 public Token<ContainerTokenIdentifier> selectToken(Text service, 043 Collection<Token<? extends TokenIdentifier>> tokens) { 044 if (service == null) { 045 return null; 046 } 047 for (Token<? extends TokenIdentifier> token : tokens) { 048 if (LOG.isDebugEnabled()) { 049 LOG.info("Looking for service: " + service + ". Current token is " 050 + token); 051 } 052 if (ContainerTokenIdentifier.KIND.equals(token.getKind()) && 053 service.equals(token.getService())) { 054 return (Token<ContainerTokenIdentifier>) token; 055 } 056 } 057 return null; 058 } 059 060}