Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/task/Tasks.java @ 35:6f68e94c1fb8 default tip

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Add CondensedStats monitoring utility, equivalent to vmstat
author Dominic Cleal <dominic-cleal@cdo2.com>
date Thu, 05 Aug 2010 11:07:25 +0100
parents 3dc0c5604566
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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1 package org.dancres.blitz.task;
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2
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3 import java.util.Iterator;
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4 import java.util.HashMap;
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5
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6 import java.util.logging.Logger;
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7 import java.util.logging.Level;
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8
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9 import net.jini.config.ConfigurationException;
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10
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11 import EDU.oswego.cs.dl.util.concurrent.LinkedQueue;
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12 import EDU.oswego.cs.dl.util.concurrent.BoundedLinkedQueue;
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13 import EDU.oswego.cs.dl.util.concurrent.PooledExecutor;
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14 import EDU.oswego.cs.dl.util.concurrent.Channel;
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15
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16 import org.dancres.blitz.ActiveObject;
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17 import org.dancres.blitz.ActiveObjectRegistry;
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18 import org.dancres.blitz.Logging;
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19 import org.dancres.blitz.stats.StatsBoard;
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20
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21 import org.dancres.blitz.config.ConfigurationFactory;
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22 import org.dancres.blitz.util.QueueStatGenerator;
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23
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24 /**
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25 Various operations within the space must be handled in background.
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26 This class encapsulates a pool of threads which execute operations
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27 (Task instances) as they are queued. <P>
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28
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29 It might, at first, appear to make sense to have separate pools for
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30 event notification, blocked call wakeups etc. in the belief that one can
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31 better control the balance of dispatch of, for example, notifies in
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32 comparison with searches. <P>
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33
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34 In reality, this won't work as each pool has a set of threads all with the
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35 same priority. i.e. They share whatever CPU is available in a manner
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36 driven by the number of tasks they must perform. Thus, if one wishes
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37 to truly balance, say, notification rate against search wakeups, one
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38 must assign differing priorities to these <I>tasks</I> as opposed to
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39 <I>threads</I> to ensure CPU consumption is bounded and that, whichever
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40 tasks have priority, get to use the CPU first.
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41 */
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42 public class Tasks implements ActiveObject {
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43 private static Logger theLogger =
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44 Logging.newLogger("org.dancres.blitz.task.Tasks");
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45
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46 private static final String DEFAULT_QUEUE = "DefaultTask";
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47
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48 private static Tasks theTasks = new Tasks();
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49
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50 private static int MAX_TASK_THREADS;
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51
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52 private static int TASK_QUEUE_BOUND;
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53
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54 static {
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55 try {
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56 MAX_TASK_THREADS = ((Integer)
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57 ConfigurationFactory.getEntry("maxTaskThreads",
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58 int.class,
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59 new Integer(10))).intValue();
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60 TASK_QUEUE_BOUND = ((Integer)
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61 ConfigurationFactory.getEntry("taskQueueBound",
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62 int.class,
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63 new Integer(0))).intValue();
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64
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65 theLogger.log(Level.INFO, "Maximum task threads: " +
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66 MAX_TASK_THREADS);
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67 theLogger.log(Level.INFO, "Task queue bound: " +
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68 TASK_QUEUE_BOUND);
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69
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70 } catch (ConfigurationException aCE) {
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71 theLogger.log(Level.SEVERE, "Failed to load config", aCE);
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72 }
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73 }
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74
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75 private HashMap theExecutors = new HashMap();
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76
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77 private Tasks() {
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78 ActiveObjectRegistry.add(this);
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79 }
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80
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81 public static void queue(Task aTask) throws InterruptedException {
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82 queue(DEFAULT_QUEUE, aTask);
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83 }
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84
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85 public static void queue(String aQueue,
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86 Task aTask) throws InterruptedException {
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87 theTasks.execute(aQueue, aTask);
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88 }
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89
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90 private void execute(String aQueue, Task aTask)
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91 throws InterruptedException {
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92
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93 getExecutor(aQueue).execute(aTask);
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94 }
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95
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96 public void begin() {
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97 }
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98
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99 public void halt() {
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100 synchronized(theExecutors) {
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101 Iterator myExecs = theExecutors.values().iterator();
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102
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103 while (myExecs.hasNext()) {
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104 PooledExecutor myExec = (PooledExecutor) myExecs.next();
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105 myExec.shutdownNow();
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106 }
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107 }
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108 }
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109
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110 private PooledExecutor getExecutor(String aName) {
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111 PooledExecutor myExec;
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112
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113 synchronized(theExecutors) {
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114 myExec = (PooledExecutor) theExecutors.get(aName);
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115
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116 if (myExec == null) {
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117
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118 BoundedLinkedQueue myQueue;
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119
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120 if (TASK_QUEUE_BOUND == 0) {
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121 theLogger.log(Level.INFO,
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122 "Creating task pool with no bounds");
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123
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124
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125 myQueue = new BoundedLinkedQueue(Integer.MAX_VALUE);
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126 myExec = new PooledExecutor(myQueue, MAX_TASK_THREADS);
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127 } else {
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128 theLogger.log(Level.INFO,
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129 "Creating task pool with bounds: " +
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130 TASK_QUEUE_BOUND);
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131
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132 myQueue = new BoundedLinkedQueue(TASK_QUEUE_BOUND);
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133 myExec =
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134 new PooledExecutor(myQueue, MAX_TASK_THREADS);
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parents:
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135 }
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parents:
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136
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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137 myExec.setMinimumPoolSize(MAX_TASK_THREADS);
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138 // myExec.waitWhenBlocked();
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Dan Creswell <dan.creswell@gmail.com>
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139
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Dan Creswell <dan.creswell@gmail.com>
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140 StatsBoard.get().add(new QueueStatGenerator(aName, myQueue));
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141 theExecutors.put(aName, myExec);
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142 }
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143
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144 return myExec;
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145 }
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146 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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147 }