| /* |
| * 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.rmi; |
| |
| import sun.jvmstat.monitor.*; |
| import sun.jvmstat.monitor.remote.*; |
| import sun.jvmstat.perfdata.monitor.*; |
| import java.io.*; |
| import java.rmi.RemoteException; |
| import java.nio.ByteBuffer; |
| |
| /** |
| * The concrete PerfDataBuffer implementation for the <em>rmi:</em> |
| * protocol for the HotSpot PerfData monitoring implementation. |
| * <p> |
| * This class is responsible for acquiring the instrumentation buffer |
| * data for a remote target HotSpot Java Virtual Machine. |
| * |
| * @author Brian Doherty |
| * @since 1.5 |
| */ |
| public class PerfDataBuffer extends AbstractPerfDataBuffer { |
| |
| private RemoteVm rvm; |
| |
| /** |
| * Create a PerfDataBuffer instance for accessing the specified |
| * instrumentation buffer. |
| * |
| * @param rvm the proxy to the remote MonitredVm object |
| * @param lvmid the local Java Virtual Machine Identifier of the |
| * remote target. |
| * |
| * @throws MonitorException |
| */ |
| public PerfDataBuffer(RemoteVm rvm, int lvmid) throws MonitorException { |
| |
| this.rvm = rvm; |
| try { |
| ByteBuffer buffer = ByteBuffer.allocate(rvm.getCapacity()); |
| sample(buffer); |
| createPerfDataBuffer(buffer, lvmid); |
| |
| } catch (RemoteException e) { |
| throw new MonitorException("Could not read data for remote JVM " |
| + lvmid, e); |
| } |
| } |
| |
| /** |
| * Get a copy of the remote instrumentation buffer. |
| *<p> |
| * The data in the remote instrumentation buffer is copied into |
| * the local byte buffer. |
| * |
| * @param buffer the buffer to receive the copy of the remote |
| * instrumentation buffer. |
| * @throws RemoteException Thrown on any communications errors with |
| * the remote system. |
| */ |
| public void sample(ByteBuffer buffer) throws RemoteException { |
| assert buffer != null; |
| assert rvm != null; |
| synchronized(buffer) { |
| buffer.clear(); |
| buffer.put(rvm.getBytes()); |
| } |
| } |
| } |