/*
* Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.jvmstat.perfdata.monitor.protocol.local;
import sun.misc.Perf;
import sun.jvmstat.monitor.*;
import sun.jvmstat.perfdata.monitor.*;
import java.util.*;
import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.lang.reflect.Constructor;
import java.security.AccessController;
/**
* The concrete PerfDataBuffer implementation for the <em>local:</em>
* protocol for the HotSpot PerfData monitoring implementation.
* <p>
* This class is responsible for acquiring access to the shared memory
* instrumentation buffer for the target HotSpot Java Virtual Machine.
*
* @author Brian Doherty
* @since 1.5
*/
// Suppreess unchecked conversion warning at line 34.
//@SuppressWarnings("unchecked")
public class PerfDataBuffer extends AbstractPerfDataBuffer {
private static final Perf perf = AccessController.doPrivileged(new Perf.GetPerfAction());
/**
* Create a PerfDataBuffer instance for accessing the specified
* instrumentation buffer.
*
* @param vmid the <em>local:</em> URI specifying the target JVM.
*
* @throws MonitorException
*/
public PerfDataBuffer(VmIdentifier vmid) throws MonitorException {
try {
// Try 1.4.2 and later first
ByteBuffer bb = perf.attach(vmid.getLocalVmId(), vmid.getMode());
createPerfDataBuffer(bb, vmid.getLocalVmId());
} catch (IllegalArgumentException e) {
// now try 1.4.1 by attempting to directly map the files.
try {
String filename = PerfDataFile.getTempDirectory()
+ PerfDataFile.dirNamePrefix
+ Integer.toString(vmid.getLocalVmId());
File f = new File(filename);
FileChannel fc = new RandomAccessFile(f, "r").getChannel();
ByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0L,
(int)fc.size());
fc.close();
createPerfDataBuffer(bb, vmid.getLocalVmId());
} catch (FileNotFoundException e2) {
// re-throw the exception from the 1.4.2 attach method
throw new MonitorException(vmid.getLocalVmId() + " not found",
e);
} catch (IOException e2) {
throw new MonitorException("Could not map 1.4.1 file for "
+ vmid.getLocalVmId(), e2);
}
} catch (IOException e) {
throw new MonitorException("Could not attach to "
+ vmid.getLocalVmId(), e);
}
}
}