hadoop FastSaslClientFactory 源码
haddop FastSaslClientFactory 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/FastSaslClientFactory.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;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.security.auth.callback.CallbackHandler;
import javax.security.sasl.Sasl;
import javax.security.sasl.SaslClient;
import javax.security.sasl.SaslClientFactory;
import javax.security.sasl.SaslException;
import org.apache.hadoop.classification.InterfaceAudience;
/**
* Class for dealing with caching SASL client factories.
*/
@InterfaceAudience.LimitedPrivate({ "HDFS", "MapReduce" })
public class FastSaslClientFactory implements SaslClientFactory {
private final Map<String, List<SaslClientFactory>> factoryCache =
new HashMap<String, List<SaslClientFactory>>();
public FastSaslClientFactory(Map<String, ?> props) {
final Enumeration<SaslClientFactory> factories =
Sasl.getSaslClientFactories();
while (factories.hasMoreElements()) {
SaslClientFactory factory = factories.nextElement();
for (String mech : factory.getMechanismNames(props)) {
if (!factoryCache.containsKey(mech)) {
factoryCache.put(mech, new ArrayList<SaslClientFactory>());
}
factoryCache.get(mech).add(factory);
}
}
}
@Override
public String[] getMechanismNames(Map<String, ?> props) {
return factoryCache.keySet().toArray(new String[0]);
}
@Override
public SaslClient createSaslClient(String[] mechanisms,
String authorizationId, String protocol, String serverName,
Map<String, ?> props, CallbackHandler cbh) throws SaslException {
for (String mechanism : mechanisms) {
List<SaslClientFactory> factories = factoryCache.get(mechanism);
if (factories != null) {
for (SaslClientFactory factory : factories) {
SaslClient saslClient =
factory.createSaslClient(new String[] {mechanism},
authorizationId, protocol, serverName, props, cbh);
if (saslClient != null) {
return saslClient;
}
}
}
}
return null;
}
}
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