hadoop ClientToAMTokenSelector 源码
haddop ClientToAMTokenSelector 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/security/client/ClientToAMTokenSelector.java
/**
* 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.hadoop.yarn.security.client;
import java.util.Collection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.security.token.TokenIdentifier;
import org.apache.hadoop.security.token.TokenSelector;
public class ClientToAMTokenSelector implements
TokenSelector<ClientToAMTokenIdentifier> {
private static final Logger LOG = LoggerFactory
.getLogger(ClientToAMTokenSelector.class);
@SuppressWarnings("unchecked")
public Token<ClientToAMTokenIdentifier> selectToken(Text service,
Collection<Token<? extends TokenIdentifier>> tokens) {
if (service == null) {
return null;
}
LOG.debug("Looking for a token with service {}", service);
for (Token<? extends TokenIdentifier> token : tokens) {
LOG.debug("Token kind is {} and the token's service name is {}",
token.getKind(), token.getService());
if (ClientToAMTokenIdentifier.KIND_NAME.equals(token.getKind())
&& service.equals(token.getService())) {
return (Token<ClientToAMTokenIdentifier>) token;
}
}
return null;
}
}
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