opendaylight/md-sal/sal-dom-xsql/src/main/java/org/opendaylight/controller/md/sal/dom/xsql/XSQLThreadPool.java

   1 /*
   2  * Copyright (c) 2014, 2015 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.controller.md.sal.dom.xsql;
  10
  11 import java.util.LinkedList;
  12
  13 /**
  14  * To be removed in Nitrogen
  15  */
  16 @Deprecated
  17 public class XSQLThreadPool {
  18     private LinkedList<Runnable> tasks = new LinkedList<>();
  19     private int threadCount = 0;
  20     private int maxThreadCount = 10;
  21     private String threadPoolName = "Simple Thread Pool";
  22     private int waitTimeForIdle = 10000;
  23     private int maxQueueSize = -1;
  24     public Object waitForSlotSync = new Object();
  25
  26     public XSQLThreadPool(int _maxThreadCount, String name,
  27         int _waitTimeForIdle) {
  28         this.maxThreadCount = _maxThreadCount;
  29         this.threadPoolName = name;
  30         this.waitTimeForIdle = _waitTimeForIdle;
  31     }
  32
  33     public void addTask(Runnable r) {
  34         synchronized (tasks) {
  35             tasks.add(r);
  36             tasks.notifyAll();
  37             if (threadCount < maxThreadCount) {
  38                 threadCount++;
  39                 new WorkerThread(threadCount).start();
  40             }
  41         }
  42     }
  43
  44     private class WorkerThread extends Thread {
  45
  46         private long lastTimeExecuted = System.currentTimeMillis();
  47
  48         public WorkerThread(int threadNumber) {
  49             super(
  50                 "Thread #" + threadNumber + " Of Threadpool " + threadPoolName);
  51         }
  52
  53         public void run() {
  54             Runnable runthis = null;
  55             while (true) {
  56                 runthis = null;
  57                 if (maxQueueSize != -1) {
  58                     synchronized (waitForSlotSync) {
  59                         if (tasks.size() < maxQueueSize) {
  60                             waitForSlotSync.notifyAll();
  61                         }
  62                     }
  63                 }
  64                 synchronized (tasks) {
  65                     if (tasks.isEmpty()) {
  66                         try {
  67                             tasks.wait(2000);
  68                         } catch (Exception err) {
  69                         }
  70                     }
  71
  72                     if (!tasks.isEmpty()) {
  73                         runthis = tasks.removeFirst();
  74                     }
  75                 }
  76                 if (runthis != null) {
  77                     try {
  78                         runthis.run();
  79                     } catch (Exception err) {
  80                         err.printStackTrace();
  81                     }
  82                     lastTimeExecuted = System.currentTimeMillis();
  83                 }
  84                 if (System.currentTimeMillis() - lastTimeExecuted
  85                     > waitTimeForIdle) {
  86                     break;
  87                 }
  88             }
  89             synchronized (tasks) {
  90                 threadCount--;
  91             }
  92         }
  93     }
  94
  95     public int getNumberOfThreads() {
  96         return threadCount;
  97     }
  98
  99     public void waitForSlot() {
 100         if (tasks.size() > maxQueueSize) {
 101             synchronized (waitForSlotSync) {
 102                 try {
 103                     waitForSlotSync.wait();
 104                 } catch (Exception err) {
 105                     err.printStackTrace();
 106                 }
 107             }
 108         }
 109     }
 110
 111     public boolean isEmpty() {
 112         if (this.threadCount == 0) {
 113             return true;
 114         }
 115         return false;
 116     }
 117
 118     public void setMaxQueueSize(int size) {
 119         this.maxQueueSize = size;
 120     }
 121
 122 }