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// Copyright 2014 The Bazel Authors. All rights reserved.
//
// Licensed 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.google.devtools.build.lib.util;
import java.net.InetAddress;
import java.net.UnknownHostException;
/**
* Various utility methods for network related stuff.
*/
public final class NetUtil {
private static String hostname;
private NetUtil() {
}
/**
* Returns the *cached* short hostname (computed at most once per the lifetime of a server). Can
* take seconds to complete when the cache is cold.
*/
public static String getCachedShortHostName() {
if (hostname == null) {
synchronized (NetUtil.class) {
if (hostname == null) {
hostname = computeShortHostName();
}
}
}
return computeShortHostName();
}
/**
* Returns the short hostname or <code>unknown</code> if the host name could not be determined.
* Performs reverse DNS lookup and can take seconds to complete.
*/
private static String computeShortHostName() {
try {
return InetAddress.getLocalHost().getHostName();
} catch (UnknownHostException e) {
return "unknown";
}
}
}
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