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annotate src/org/dancres/blitz/lease/LeaseHandlers.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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1 package org.dancres.blitz.lease;
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2
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3 import java.io.IOException;
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4 import java.io.InputStream;
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5 import java.io.InputStreamReader;
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6
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7 import java.util.logging.*;
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8
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9 import net.jini.core.lease.UnknownLeaseException;
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10 import net.jini.core.lease.LeaseDeniedException;
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11 import net.jini.core.lease.Lease;
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12
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13 import net.jini.config.ConfigurationException;
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14 import net.jini.config.ConfigurationFile;
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15 import net.jini.config.Configuration;
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16
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17 import org.dancres.blitz.Logging;
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18
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19 import org.dancres.blitz.config.ConfigurationFactory;
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20
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21 import org.dancres.blitz.util.Time;
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22
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23 /**
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24 The access point for managing leases associated with SpaceUIDs. Lease
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25 management is achieved through a collection of LeaseHandlers loaded from
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26 <code>handlers.properties</code>. Each LeaseHandler "knows" about one
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27 (or possibly more) types of SpaceUID and handles renewal or cancelling of
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28 the lease associated with the SpaceUID.
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29
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30 @see org.dancres.blitz.lease.LeaseHandler
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31 */
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32 public class LeaseHandlers {
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33 private static final String MODULE_NAME =
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34 ConfigurationFactory.BLITZ_MODULE;
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35
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36 private static final String HANDLER_PROPERTY = "handlers";
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37
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38 private static LeaseHandler[] theHandlers;
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39
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40 private static Logger theLogger =
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41 Logging.newLogger("org.dancres.blitz.lease.LeaseHandlers");
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42
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43 static {
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44 try {
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45 InputStream myStream =
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46 LeaseHandlers.class.getResourceAsStream("handlers.properties");
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47
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48 if (myStream == null)
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49 throw new IOException();
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50 else {
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51 Configuration myConfig =
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52 new ConfigurationFile(new InputStreamReader(myStream),
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53 null);
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54
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55 LeaseHandler[] myFilters =
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56 (LeaseHandler[]) myConfig.getEntry(MODULE_NAME,
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57 HANDLER_PROPERTY,
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58 LeaseHandler[].class);
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59
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60 theHandlers = myFilters;
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61 }
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62
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63 } catch (Exception anE) {
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64 theLogger.log(Level.SEVERE, "Failed to load lease handlers", anE);
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65 }
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66 }
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67
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68 public static long renew(SpaceUID aUID, long aLeaseDuration)
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69 throws UnknownLeaseException, LeaseDeniedException, IOException {
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70
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71 for (int i = 0; i < theHandlers.length; i++) {
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72 if (theHandlers[i].recognizes(aUID)) {
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73 return theHandlers[i].renew(aUID, aLeaseDuration);
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74 }
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75 }
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76
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77 throw new UnknownLeaseException();
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78 }
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79
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80 public static void cancel(SpaceUID aUID)
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81 throws UnknownLeaseException, IOException {
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82
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83 for (int i = 0; i < theHandlers.length; i++) {
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84 if (theHandlers[i].recognizes(aUID)) {
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85 theHandlers[i].cancel(aUID);
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86 return;
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87 }
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88 }
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89
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90 throw new UnknownLeaseException();
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91 }
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92 }