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| 1 | +/* | |
| 2 | + * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.jvmstat.perfdata.monitor; | |
| 27 | + | |
| 28 | +import sun.misc.Perf; | |
| 29 | +import sun.jvmstat.monitor.*; | |
| 30 | +import java.util.*; | |
| 31 | +import java.io.*; | |
| 32 | +import java.lang.reflect.*; | |
| 33 | +import java.nio.ByteBuffer; | |
| 34 | + | |
| 35 | +/** | |
| 36 | + * Abstraction for the HotSpot PerfData instrumentation buffer. This class | |
| 37 | + * is responsible for acquiring access to the instrumentation buffer for | |
| 38 | + * a target HotSpot Java Virtual Machine and providing method level access | |
| 39 | + * to its contents. | |
| 40 | + * | |
| 41 | + * @author Brian Doherty | |
| 42 | + * @since 1.5 | |
| 43 | + */ | |
| 44 | +public abstract class AbstractPerfDataBuffer { | |
| 45 | + | |
| 46 | + /** | |
| 47 | + * Reference to the concrete instance created by the | |
| 48 | + * {@link #createPerfDataBuffer} method. | |
| 49 | + */ | |
| 50 | + protected PerfDataBufferImpl impl; | |
| 51 | + | |
| 52 | + /** | |
| 53 | + * Get the Local Java Virtual Machine Identifier, or <em>lvmid</em> | |
| 54 | + * for the target JVM associated with this instrumentation buffer. | |
| 55 | + * | |
| 56 | + * @return int - the lvmid | |
| 57 | + */ | |
| 58 | + public int getLocalVmId() { | |
| 59 | + return impl.getLocalVmId(); | |
| 60 | + } | |
| 61 | + | |
| 62 | + /** | |
| 63 | + * Get a copy of the raw instrumentation data. | |
| 64 | + * This method is used to get a copy of the current bytes in the | |
| 65 | + * instrumentation buffer. It is generally used for transporting | |
| 66 | + * those bytes over the network. | |
| 67 | + * | |
| 68 | + * @return byte[] - a copy of the bytes in the instrumentation buffer. | |
| 69 | + */ | |
| 70 | + public byte[] getBytes() { | |
| 71 | + return impl.getBytes(); | |
| 72 | + } | |
| 73 | + | |
| 74 | + /** | |
| 75 | + * Get the capacity of the instrumentation buffer. | |
| 76 | + * | |
| 77 | + * @return int - the capacity, or size, of the instrumentation buffer. | |
| 78 | + */ | |
| 79 | + public int getCapacity() { | |
| 80 | + return impl.getCapacity(); | |
| 81 | + } | |
| 82 | + | |
| 83 | + /** | |
| 84 | + * Find a named Instrumentation object. | |
| 85 | + * | |
| 86 | + * This method will look for the named instrumentation object in the | |
| 87 | + * instrumentation exported by this Java Virtual Machine. If an | |
| 88 | + * instrumentation object with the given name exists, a Monitor interface | |
| 89 | + * to that object will be return. Otherwise, the method returns | |
| 90 | + * <tt>null</tt>. | |
| 91 | + * | |
| 92 | + * @param name the name of the Instrumentation object to find. | |
| 93 | + * @return Monitor - the {@link Monitor} object that can be used to | |
| 94 | + * monitor the the named instrumentation object, or | |
| 95 | + * <tt>null</tt> if the named object doesn't exist. | |
| 96 | + * @throws MonitorException Thrown if an error occurs while communicating | |
| 97 | + * with the target Java Virtual Machine. | |
| 98 | + */ | |
| 99 | + public Monitor findByName(String name) throws MonitorException { | |
| 100 | + return impl.findByName(name); | |
| 101 | + } | |
| 102 | + | |
| 103 | + /** | |
| 104 | + * Find all Instrumentation objects with names matching the given pattern. | |
| 105 | + * | |
| 106 | + * This method returns a {@link List} of Monitor objects such that | |
| 107 | + * the name of each object matches the given pattern. | |
| 108 | + * | |
| 109 | + * @param patternString a string containing a pattern as described in | |
| 110 | + * {@link java.util.regex.Pattern}. | |
| 111 | + * @return List<Monitor> - a List of {@link Monitor} objects that can be used to | |
| 112 | + * monitor the instrumentation objects whose names match | |
| 113 | + * the given pattern. If no instrumentation objects have` | |
| 114 | + * names matching the given pattern, then an empty List | |
| 115 | + * is returned. | |
| 116 | + * @throws MonitorException Thrown if an error occurs while communicating | |
| 117 | + * with the target Java Virtual Machine. | |
| 118 | + * @see java.util.regex.Pattern | |
| 119 | + */ | |
| 120 | + public List<Monitor> findByPattern(String patternString) throws MonitorException { | |
| 121 | + return impl.findByPattern(patternString); | |
| 122 | + } | |
| 123 | + | |
| 124 | + /** | |
| 125 | + * Get a list of the inserted and removed monitors since last called. | |
| 126 | + * | |
| 127 | + * @return MonitorStatus - the status of available Monitors for the | |
| 128 | + * target Java Virtual Machine. | |
| 129 | + * @throws MonitorException Thrown if communications errors occur | |
| 130 | + * while communicating with the target. | |
| 131 | + */ | |
| 132 | + public MonitorStatus getMonitorStatus() throws MonitorException { | |
| 133 | + return impl.getMonitorStatus(); | |
| 134 | + } | |
| 135 | + | |
| 136 | + /** | |
| 137 | + * Get the ByteBuffer containing the instrumentation data. | |
| 138 | + * | |
| 139 | + * @return ByteBuffer - a ByteBuffer object that refers to the | |
| 140 | + * instrumentation data. | |
| 141 | + */ | |
| 142 | + public ByteBuffer getByteBuffer() { | |
| 143 | + return impl.getByteBuffer(); | |
| 144 | + } | |
| 145 | + | |
| 146 | + /** | |
| 147 | + * Create the perfdata instrumentation buffer for the given lvmid | |
| 148 | + * using the given ByteBuffer object as the source of the instrumentation | |
| 149 | + * data. This method parses the instrumentation buffer header to determine | |
| 150 | + * key characteristics of the instrumentation buffer and then dynamically | |
| 151 | + * loads the appropriate class to handle the particular instrumentation | |
| 152 | + * version. | |
| 153 | + * | |
| 154 | + * @param bb the ByteBuffer that references the instrumentation data. | |
| 155 | + * @param lvmid the Local Java Virtual Machine identifier for this | |
| 156 | + * instrumentation buffer. | |
| 157 | + * | |
| 158 | + * @throws MonitorException | |
| 159 | + */ | |
| 160 | + protected void createPerfDataBuffer(ByteBuffer bb, int lvmid) | |
| 161 | + throws MonitorException { | |
| 162 | + int majorVersion = AbstractPerfDataBufferPrologue.getMajorVersion(bb); | |
| 163 | + int minorVersion = AbstractPerfDataBufferPrologue.getMinorVersion(bb); | |
| 164 | + | |
| 165 | + // instantiate the version specific class | |
| 166 | + String classname = "sun.jvmstat.perfdata.monitor.v" | |
| 167 | + + majorVersion + "_" + minorVersion | |
| 168 | + + ".PerfDataBuffer"; | |
| 169 | + | |
| 170 | + try { | |
| 171 | + Class<?> implClass = Class.forName(classname); | |
| 172 | + Constructor cons = implClass.getConstructor(new Class[] { | |
| 173 | + Class.forName("java.nio.ByteBuffer"), | |
| 174 | + Integer.TYPE | |
| 175 | + }); | |
| 176 | + | |
| 177 | + impl = (PerfDataBufferImpl)cons.newInstance(new Object[] { | |
| 178 | + bb, new Integer(lvmid) | |
| 179 | + }); | |
| 180 | + | |
| 181 | + } catch (ClassNotFoundException e) { | |
| 182 | + // from Class.forName(); | |
| 183 | + throw new IllegalArgumentException( | |
| 184 | + "Could not find " + classname + ": " + e.getMessage(), e); | |
| 185 | + | |
| 186 | + } catch (NoSuchMethodException e) { | |
| 187 | + // from Class.getConstructor(); | |
| 188 | + throw new IllegalArgumentException( | |
| 189 | + "Expected constructor missing in " + classname + ": " | |
| 190 | + + e.getMessage(), e); | |
| 191 | + | |
| 192 | + } catch (IllegalAccessException e) { | |
| 193 | + // from Constructor.newInstance() | |
| 194 | + throw new IllegalArgumentException( | |
| 195 | + "Unexpected constructor access in " + classname + ": " | |
| 196 | + + e.getMessage(), e); | |
| 197 | + | |
| 198 | + } catch (InstantiationException e) { | |
| 199 | + throw new IllegalArgumentException( | |
| 200 | + classname + "is abstract: " + e.getMessage(), e); | |
| 201 | + | |
| 202 | + } catch (InvocationTargetException e) { | |
| 203 | + Throwable cause = e.getCause(); | |
| 204 | + if (cause instanceof MonitorException) { | |
| 205 | + throw (MonitorException)cause; | |
| 206 | + } | |
| 207 | + throw new RuntimeException("Unexpected exception: " | |
| 208 | + + e.getMessage() , e); | |
| 209 | + } | |
| 210 | + } | |
| 211 | +} | |