com.cloudera.hadoop.hdfs.nfs.NetUtils.java Source code

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Here is the source code for com.cloudera.hadoop.hdfs.nfs.NetUtils.java

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/**
 * Copyright 2012 Cloudera Inc.
 *
 * 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 com.cloudera.hadoop.hdfs.nfs;

import static com.cloudera.hadoop.hdfs.nfs.nfs4.Constants.*;

import java.net.InetAddress;
import java.util.Random;

import org.apache.hadoop.conf.Configuration;
import org.apache.log4j.Logger;

import com.google.common.base.Joiner;

public class NetUtils {
    protected static final Logger LOGGER = Logger.getLogger(NetUtils.class);
    private static final Random RANDOM = new Random();

    public static String getDomain(Configuration conf, InetAddress address) {
        String override = conf.get(NFS_OWNER_DOMAIN);
        if (override != null) {
            return override;
        }
        String host = address.getCanonicalHostName();
        if (address.isLoopbackAddress() && address.getHostAddress().equals(address.getHostName())) {
            // loopback does not resolve
            return "localdomain";
        }
        int pos;
        if (((pos = host.indexOf('.')) > 0) && (pos < host.length())) {
            return host.substring(pos + 1);
        }
        LOGGER.error(Joiner.on("\n").join("Unable to find the domain the server is running on. Please report.",
                "canonicalHostName = " + host, "hostname = " + address.getHostName(),
                "isLoopback = " + address.isLoopbackAddress(), "hostAdddress = " + address.getHostAddress()));
        return "unknown";
    }

    public static synchronized int nextRandomInt() {
        return RANDOM.nextInt();
    }
}