/**

  * Copyright 2009 Martin Vysny.

  *

  * This file is part of WebVM.

  *

  * WebVM is free software: you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation, either version 3 of the License, or

  * (at your option) any later version.

  *

  * WebVM 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 for more details.

  *

  * You should have received a copy of the GNU General Public License

  * along with WebVM.  If not, see <http://www.gnu.org/licenses/>.

  */

 package sk.baka.webvm.analyzer;

 import sk.baka.webvm.analyzer.hostos.Memory;

 import java.lang.management.ManagementFactory;

 import java.lang.management.MemoryUsage;

 import java.lang.management.ThreadInfo;

 import java.lang.management.ThreadMXBean;

 import sk.baka.webvm.analyzer.hostos.Cpu;

 import sk.baka.webvm.misc.MgmtUtils;

 /**

  * Holds history data for a single time unit.

  * @author Martin Vysny

  */

 public final class HistorySample {

     /**

      * Returns GC CPU Usage.

      * @return average CPU usage of GC for this time slice in percent, 0-100.

      */

     public final int gcCpuUsage;

     /**

      * The time this sample was taken.

      */

     public final long sampleTime;

     /**

      * The {@link MgmtUtils#getHeapFromRuntime() heap usage}.

      */

     public static final int POOL_HEAP = 0;

     /**

      * The {@link MgmtUtils#getNonHeapSummary() non-heap usage}, may be null.

      */

     public static final int POOL_NON_HEAP = 1;

     /**

      * The {@link HostOS.getPhysicalMemory() host OS physical memory}, may be null.

      */

     public static final int POOL_PHYS_MEM = 2;

     /**

      * The {@link HostOS.getSwap() swap}, may be null.

      */

     public static final int POOL_SWAP = 3;

     /**

      * The memory usage list, indexed according to the value of the <code>POOL_*</code> constants.

      */

     public final MemoryUsage[] memPoolUsage = new MemoryUsage[4];

     /**

      * A thread dump. Does not contain any stacktraces. Never null.

      */

     public final ThreadInfo[] threads;

     /**

      * Count of classes currently loaded in the VM.

      */

     public final int classesLoaded;

     /**

      * Current count of daemon threads.

      */

     public final int daemonThreadCount;

     /**

      * Returns current count of all threads.

      * @return current count of all threads.

      */

     public final int threadCount;

     /**

      * Shows the host OS CPU usage. A value of 0..100, 0 when not supported.

      */

     public final int cpuUsage;

     /**

      * Shows the owner java process CPU usage. A value of 0..100, 0 when not supported.

      */

     public final int cpuJavaUsage;

     /**

      * Shows the host OS CPU IO usage. A value of 0..100, 0 when not supported.

      */

     public final int cpuIOUsage;

     /**

      * Creates new history sample bean.

      * @param gcCpuUsage average CPU usage of GC for this time slice in percent.

      * @param cpuOSUsage Shows the host OS CPU usage. A value of 0..100, 0 when not supported.

      * @param cpuJavaUsage Shows the owner java process CPU usage. A value of 0..100, 0 when not supported.

      * @param cpuIOUsage Shows the host OS CPU IO usage. A value of 0..100, 0 when not supported.

      */

     public HistorySample(final int gcCpuUsage, final int cpuOSUsage, final int cpuJavaUsage, final int cpuIOUsage) {

         this.gcCpuUsage = gcCpuUsage;

         memPoolUsage[POOL_HEAP] = MgmtUtils.getInMB(MgmtUtils.getHeapFromRuntime());

         memPoolUsage[POOL_NON_HEAP] = MgmtUtils.getInMB(MgmtUtils.getNonHeapSummary());

         this.sampleTime = System.currentTimeMillis();

         final ThreadMXBean tbean = ManagementFactory.getThreadMXBean();

         threads = tbean.getThreadInfo(tbean.getAllThreadIds());

         threadCount = tbean.getThreadCount();

         daemonThreadCount = tbean.getDaemonThreadCount();

         classesLoaded = ManagementFactory.getClassLoadingMXBean().getLoadedClassCount();

         memPoolUsage[POOL_PHYS_MEM] = MgmtUtils.getInMB(Memory.getPhysicalMemory());

         memPoolUsage[POOL_SWAP] = MgmtUtils.getInMB(Memory.getSwap());

         cpuUsage = cpuOSUsage;

         this.cpuJavaUsage = cpuJavaUsage;

         this.cpuIOUsage = cpuIOUsage;

     }

 }