Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/txn/TxnPinger.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.txn;
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2
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3 import java.rmi.RemoteException;
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4 import java.rmi.NoSuchObjectException;
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5
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6 import java.util.List;
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7 import java.util.Iterator;
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8
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9 import java.util.logging.Level;
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10
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11 import net.jini.core.transaction.UnknownTransactionException;
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12
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13 import net.jini.config.ConfigurationException;
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14
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15 import org.dancres.blitz.ActiveObject;
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16 import org.dancres.blitz.ActiveObjectRegistry;
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17
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18 import org.dancres.blitz.config.ConfigurationFactory;
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19
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20 /**
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21 <p>An instance of this class is created by <code>TransactionManager</code>
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22 once recovery has been completed. It's purpose is to regularly check known
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23 remote transactions status and abort any that can be declared "dead" as
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24 a result of specific results from invoking the remote
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25 <code>TransactionManager</code>'s <code>getState</code> method.</p>
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26 */
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27 class TxnPinger implements ActiveObject, Runnable {
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28 private static final String PING_PAUSE = "txnPingInterval";
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29
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30 static final long NO_PAUSE = -1;
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31
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32 private long thePause = NO_PAUSE;
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33 private Thread theThread;
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34 private TxnManagerState theState;
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35
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36 TxnPinger(TxnManagerState aState) {
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37 try {
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38 thePause =
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39 ((Long)
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40 ConfigurationFactory.getEntry(PING_PAUSE,
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41 long.class,
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42 new Long(NO_PAUSE))).longValue();
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43 } catch (ConfigurationException anE) {
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44 TxnManager.theLogger.log(Level.SEVERE,
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45 "Failed to load txn ping interval",
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46 anE);
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47 }
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48
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49 if (thePause != NO_PAUSE) {
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50 TxnManager.theLogger.log(Level.INFO, "Txn Pinger active with: " +
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51 thePause + " ms");
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52 ActiveObjectRegistry.add(this);
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53 }
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54 }
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55
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56 public void begin() {
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57 theThread = new Thread(this, "TxnPinger");
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58 theThread.setDaemon(true);
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59 theThread.start();
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60 }
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61
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62 public void halt() {
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63 theThread.interrupt();
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64 }
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65
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66 public void run() {
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67 while (true) {
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68 try {
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69 Thread.sleep(thePause);
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70 } catch (InterruptedException anIE) {
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71 return;
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72 }
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73
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74
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75 Iterator myTxnIds = theState.getActiveTxnIds().iterator();
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76
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77 while (myTxnIds.hasNext()) {
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78 TxnId myId = (TxnId) myTxnIds.next();
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79
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80 // Skip local transactions
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81 //
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82 if (myId.isNull())
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83 continue;
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84
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85 /*
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86 NoSuchObjectException or UnknownTransactionException means
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87 we can kill this transaction.
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88 */
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89 try {
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90 TxnGateway myGateway = TxnManager.get().getGateway();
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91
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92 myGateway.getState(myId);
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93 } catch (RemoteException anRE) {
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94 if (anRE instanceof NoSuchObjectException) {
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95 attemptAbort(myId);
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96 }
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97 } catch (UnknownTransactionException aUTE) {
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98 attemptAbort(myId);
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99 }
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100 }
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101 }
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102 }
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103
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104 private void attemptAbort(TxnId anId) {
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105 TxnManager myManager = TxnManager.get();
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106
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107 try {
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108 myManager.abort(myManager.getTxnFor(anId));
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109 } catch (Exception anE) {
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110 // Nothing more to do, try again next time
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111 TxnManager.theLogger.log(Level.SEVERE,
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112 "Attempted to abort dead transaction: " +
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113 anId, anE);
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114 }
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115 }
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116 }