hadoop AbstractDelegationTokenSelector 源码
haddop AbstractDelegationTokenSelector 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/AbstractDelegationTokenSelector.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.security.token.delegation;
import java.util.Collection;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
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;
/**
* Look through tokens to find the first delegation token that matches the
* service and return it.
*/
@InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"})
@InterfaceStability.Evolving
public
class AbstractDelegationTokenSelector<TokenIdent
extends AbstractDelegationTokenIdentifier>
implements TokenSelector<TokenIdent> {
private Text kindName;
protected AbstractDelegationTokenSelector(Text kindName) {
this.kindName = kindName;
}
@SuppressWarnings("unchecked")
@Override
public Token<TokenIdent> selectToken(Text service,
Collection<Token<? extends TokenIdentifier>> tokens) {
if (service == null) {
return null;
}
for (Token<? extends TokenIdentifier> token : tokens) {
if (kindName.equals(token.getKind())
&& service.equals(token.getService())) {
return (Token<TokenIdent>) token;
}
}
return null;
}
}
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