Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/task/Tasks.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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rev | line source |
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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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135 } |
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136 |
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137 myExec.setMinimumPoolSize(MAX_TASK_THREADS); |
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138 // myExec.waitWhenBlocked(); |
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139 |
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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 } |
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147 } |