/* * 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.file;import sun.jvmstat.monitor.*;import sun.jvmstat.perfdata.monitor.*;import java.io.*;import java.net.URI;import java.nio.ByteBuffer;import java.nio.channels.FileChannel;/** * The concrete PerfDataBuffer implementation for the <em>file:</em> * protocol for the HotSpot PerfData monitoring implemetation. * <p> * This class is responsible for acquiring access to the instrumentation * buffer stored in a file referenced by a file URI. * * @author Brian Doherty * @since 1.5 */public class PerfDataBuffer extends AbstractPerfDataBuffer { /** * Create a PerfDataBuffer instance for accessing the specified * instrumentation buffer. * * @param vmid the <em>file:</em> URI to the instrumentation buffer file * * @throws MonitorException */ public PerfDataBuffer(VmIdentifier vmid) throws MonitorException { File f = new File(vmid.getURI()); String mode = vmid.getMode(); try { FileChannel fc = new RandomAccessFile(f, mode).getChannel(); ByteBuffer bb = null; if (mode.compareTo("r") == 0) { bb = fc.map(FileChannel.MapMode.READ_ONLY, 0L, (int)fc.size()); } else if (mode.compareTo("rw") == 0) { bb = fc.map(FileChannel.MapMode.READ_WRITE, 0L, (int)fc.size()); } else { throw new IllegalArgumentException("Invalid mode: " + mode); } fc.close(); // doesn't need to remain open createPerfDataBuffer(bb, 0); } catch (FileNotFoundException e) { throw new MonitorException("Could not find " + vmid.toString()); } catch (IOException e) { throw new MonitorException("Could not read " + vmid.toString()); } }}
/*
* 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.file;
import sun.jvmstat.monitor.*;
import sun.jvmstat.perfdata.monitor.*;
import java.io.*;
import java.net.URI;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
/**
* The concrete PerfDataBuffer implementation for the <em>file:</em>
* protocol for the HotSpot PerfData monitoring implemetation.
* <p>
* This class is responsible for acquiring access to the instrumentation
* buffer stored in a file referenced by a file URI.
*
* @author Brian Doherty
* @since 1.5
*/
public class PerfDataBuffer extends AbstractPerfDataBuffer {
/**
* Create a PerfDataBuffer instance for accessing the specified
* instrumentation buffer.
*
* @param vmid the <em>file:</em> URI to the instrumentation buffer file
*
* @throws MonitorException
*/
public PerfDataBuffer(VmIdentifier vmid) throws MonitorException {
File f = new File(vmid.getURI());
String mode = vmid.getMode();
try {
FileChannel fc = new RandomAccessFile(f, mode).getChannel();
ByteBuffer bb = null;
if (mode.compareTo("r") == 0) {
bb = fc.map(FileChannel.MapMode.READ_ONLY, 0L, (int)fc.size());
} else if (mode.compareTo("rw") == 0) {
bb = fc.map(FileChannel.MapMode.READ_WRITE, 0L, (int)fc.size());
} else {
throw new IllegalArgumentException("Invalid mode: " + mode);
}
fc.close(); // doesn't need to remain open
createPerfDataBuffer(bb, 0);
} catch (FileNotFoundException e) {
throw new MonitorException("Could not find " + vmid.toString());
} catch (IOException e) {
throw new MonitorException("Could not read " + vmid.toString());
}
}
}