org.apache.hadoop.hdfs.protocol.datatransfer.TrustedChannelResolver.java Source code

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Here is the source code for org.apache.hadoop.hdfs.protocol.datatransfer.TrustedChannelResolver.java

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/**
 * 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.hdfs.protocol.datatransfer;

import java.net.InetAddress;

import org.apache.hadoop.conf.Configurable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
import org.apache.hadoop.util.ReflectionUtils;

/**
 * Class used to indicate whether a channel is trusted or not.
 * The default implementation is to return false indicating that
 * the channel is not trusted.
 * This class can be overridden to provide custom logic to determine
 * whether a channel is trusted or not.
 * The custom class can be specified via configuration.
 *
 */
public class TrustedChannelResolver implements Configurable {
    Configuration conf;

    /**
     * Returns an instance of TrustedChannelResolver.
     * Looks up the configuration to see if there is custom class specified.
     * @return TrustedChannelResolver
     */
    public static TrustedChannelResolver getInstance(Configuration conf) {
        Class<? extends TrustedChannelResolver> clazz = conf.getClass(
                HdfsClientConfigKeys.DFS_TRUSTEDCHANNEL_RESOLVER_CLASS, TrustedChannelResolver.class,
                TrustedChannelResolver.class);
        return ReflectionUtils.newInstance(clazz, conf);
    }

    @Override
    public void setConf(Configuration conf) {
        this.conf = conf;
    }

    @Override
    public Configuration getConf() {
        return conf;
    }

    /**
     * Return boolean value indicating whether a channel is trusted or not
     * from a client's perspective.
     * @return true if the channel is trusted and false otherwise.
     */
    public boolean isTrusted() {
        return false;
    }

    /**
     * Identify boolean value indicating whether a channel is trusted or not.
     * @param peerAddress address of the peer
     * @return true if the channel is trusted and false otherwise.
     */
    public boolean isTrusted(InetAddress peerAddress) {
        return false;
    }
}