com.metamx.metrics.SigarUtil Maven / Gradle / Ivy
/*
* Copyright 2012 Metamarkets Group Inc.
*
* 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.metamx.metrics;
import com.google.common.base.Throwables;
import com.metamx.common.StreamUtils;
import com.metamx.common.logger.Logger;
import org.hyperic.jni.ArchLoaderException;
import org.hyperic.jni.ArchNotSupportedException;
import org.hyperic.sigar.Sigar;
import org.hyperic.sigar.SigarLoader;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.nio.file.Files;
public class SigarUtil
{
private static final Logger log = new Logger(SigarUtil.class);
// Note: this is required to load the sigar native lib.
static {
SigarLoader loader = new SigarLoader(Sigar.class);
try {
String libName = loader.getLibraryName();
final URL url = SysMonitor.class.getResource("/" + libName);
if (url != null) {
final File tmpDir = Files.createTempDirectory("sigar").toFile();
// As per java.io.DeleteOnExitHook.runHooks() deletion order is reversed from registration order
tmpDir.deleteOnExit();
final File nativeLibTmpFile = new File(tmpDir, libName);
nativeLibTmpFile.deleteOnExit();
StreamUtils.copyToFileAndClose(url.openStream(), nativeLibTmpFile);
log.info("Loading sigar native lib at tmpPath[%s]", nativeLibTmpFile);
loader.load(nativeLibTmpFile.getParent());
} else {
log.info("No native libs found in jar, letting the normal load mechanisms figger it out.");
}
}
catch (ArchNotSupportedException | ArchLoaderException | IOException e) {
throw Throwables.propagate(e);
}
}
public static Sigar getSigar()
{
return new Sigar();
}
/**
* CurrentProcessIdHolder class is initialized after SigarUtil, that guarantees that new Sigar() is executed after
* static block (which loads the library) of SigarUtil is executed. This is anyway guaranteed by JLS if the static
* field goes below the static block in textual order, but fragile e. g. if someone applies automatic reformatting and
* the static field is moved above the static block.
*/
private static class CurrentProcessIdHolder
{
private static final long currentProcessId = new Sigar().getPid();
}
public static long getCurrentProcessId()
{
return CurrentProcessIdHolder.currentProcessId;
}
}