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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 | } | ||