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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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).
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package sun.management;

import sun.misc.Perf;
import sun.management.counter.*;
import sun.management.counter.perf.*;
import java.nio.ByteBuffer;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.List;
import java.util.Arrays;
import java.util.Collections;
import java.security.AccessController;
import java.security.PrivilegedAction;
import sun.security.action.GetPropertyAction;

Implementation of VMManagement interface that accesses the management attributes and operations locally within the same Java virtual machine.
/** * Implementation of VMManagement interface that accesses the management * attributes and operations locally within the same Java virtual * machine. */
class VMManagementImpl implements VMManagement { private static String version; private static boolean compTimeMonitoringSupport; private static boolean threadContentionMonitoringSupport; private static boolean currentThreadCpuTimeSupport; private static boolean otherThreadCpuTimeSupport; private static boolean bootClassPathSupport; private static boolean objectMonitorUsageSupport; private static boolean synchronizerUsageSupport; private static boolean threadAllocatedMemorySupport; private static boolean gcNotificationSupport; static { version = getVersion0(); if (version == null) { throw new AssertionError("Invalid Management Version"); } initOptionalSupportFields(); } private native static String getVersion0(); private native static void initOptionalSupportFields(); // Optional supports public boolean isCompilationTimeMonitoringSupported() { return compTimeMonitoringSupport; } public boolean isThreadContentionMonitoringSupported() { return threadContentionMonitoringSupport; } public boolean isCurrentThreadCpuTimeSupported() { return currentThreadCpuTimeSupport; } public boolean isOtherThreadCpuTimeSupported() { return otherThreadCpuTimeSupport; } public boolean isBootClassPathSupported() { return bootClassPathSupport; } public boolean isObjectMonitorUsageSupported() { return objectMonitorUsageSupport; } public boolean isSynchronizerUsageSupported() { return synchronizerUsageSupport; } public boolean isThreadAllocatedMemorySupported() { return threadAllocatedMemorySupport; } public boolean isGcNotificationSupported() { return gcNotificationSupport; } public native boolean isThreadContentionMonitoringEnabled(); public native boolean isThreadCpuTimeEnabled(); public native boolean isThreadAllocatedMemoryEnabled(); // Class Loading Subsystem public int getLoadedClassCount() { long count = getTotalClassCount() - getUnloadedClassCount(); return (int) count; } public native long getTotalClassCount(); public native long getUnloadedClassCount(); public native boolean getVerboseClass(); // Memory Subsystem public native boolean getVerboseGC(); // Runtime Subsystem public String getManagementVersion() { return version; } public String getVmId() { int pid = getProcessId(); String hostname = "localhost"; try { hostname = InetAddress.getLocalHost().getHostName(); } catch (UnknownHostException e) { // ignore } return pid + "@" + hostname; } private native int getProcessId(); public String getVmName() { return System.getProperty("java.vm.name"); } public String getVmVendor() { return System.getProperty("java.vm.vendor"); } public String getVmVersion() { return System.getProperty("java.vm.version"); } public String getVmSpecName() { return System.getProperty("java.vm.specification.name"); } public String getVmSpecVendor() { return System.getProperty("java.vm.specification.vendor"); } public String getVmSpecVersion() { return System.getProperty("java.vm.specification.version"); } public String getClassPath() { return System.getProperty("java.class.path"); } public String getLibraryPath() { return System.getProperty("java.library.path"); } public String getBootClassPath( ) { PrivilegedAction<String> pa = new GetPropertyAction("sun.boot.class.path"); String result = AccessController.doPrivileged(pa); return result; } private List<String> vmArgs = null; public synchronized List<String> getVmArguments() { if (vmArgs == null) { String[] args = getVmArguments0(); List<String> l = ((args != null && args.length != 0) ? Arrays.asList(args) : Collections.<String>emptyList()); vmArgs = Collections.unmodifiableList(l); } return vmArgs; } public native String[] getVmArguments0(); public native long getStartupTime(); public native int getAvailableProcessors(); // Compilation Subsystem public String getCompilerName() { String name = AccessController.doPrivileged( new PrivilegedAction<String>() { public String run() { return System.getProperty("sun.management.compiler"); } }); return name; } public native long getTotalCompileTime(); // Thread Subsystem public native long getTotalThreadCount(); public native int getLiveThreadCount(); public native int getPeakThreadCount(); public native int getDaemonThreadCount(); // Operating System public String getOsName() { return System.getProperty("os.name"); } public String getOsArch() { return System.getProperty("os.arch"); } public String getOsVersion() { return System.getProperty("os.version"); } // Hotspot-specific runtime support public native long getSafepointCount(); public native long getTotalSafepointTime(); public native long getSafepointSyncTime(); public native long getTotalApplicationNonStoppedTime(); public native long getLoadedClassSize(); public native long getUnloadedClassSize(); public native long getClassLoadingTime(); public native long getMethodDataSize(); public native long getInitializedClassCount(); public native long getClassInitializationTime(); public native long getClassVerificationTime(); // Performance Counter Support private PerfInstrumentation perfInstr = null; private boolean noPerfData = false; private synchronized PerfInstrumentation getPerfInstrumentation() { if (noPerfData || perfInstr != null) { return perfInstr; } // construct PerfInstrumentation object Perf perf = AccessController.doPrivileged(new Perf.GetPerfAction()); try { ByteBuffer bb = perf.attach(0, "r"); if (bb.capacity() == 0) { noPerfData = true; return null; } perfInstr = new PerfInstrumentation(bb); } catch (IllegalArgumentException e) { // If the shared memory doesn't exist e.g. if -XX:-UsePerfData // was set noPerfData = true; } catch (IOException e) { throw new AssertionError(e); } return perfInstr; } public List<Counter> getInternalCounters(String pattern) { PerfInstrumentation perf = getPerfInstrumentation(); if (perf != null) { return perf.findByPattern(pattern); } else { return Collections.emptyList(); } } }