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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.net;
import java.io.BufferedReader;
import java.io.InputStreamReader;
/**
* Utilities for getting the hostname on a system running with the JVM. This is moved here from the old
* HostSystem#getHostName in config-model.
*
* @author lulf
*/
public class HostName {
private static String myHost = null;
/**
* Static method that returns the name of localhost using shell command "hostname".
* If you need a guaranteed resolvable name see LinuxINetAddress.
*
* @return the name of localhost.
* @throws RuntimeException if executing the command 'hostname' fails.
*/
public static synchronized String getLocalhost() {
if (myHost == null) {
try {
Process p = Runtime.getRuntime().exec("hostname");
BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
myHost = in.readLine();
p.waitFor();
if (p.exitValue() != 0) {
throw new RuntimeException("Command 'hostname' failed: exit("+p.exitValue()+")");
}
} catch (Exception e) {
throw new RuntimeException("Failed when executing command 'hostname'", e);
}
}
return myHost;
}
}
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