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4fb826b1 | 1 | /* |
c0c0989a | 2 | * SPDX-License-Identifier: MIT |
4fb826b1 | 3 | * |
c0c0989a MJ |
4 | * Copyright (C) 2015 EfficiOS Inc. |
5 | * Copyright (C) 2015 Alexandre Montplaisir <alexmonthy@efficios.com> | |
4fb826b1 AM |
6 | */ |
7 | ||
8 | import java.io.IOException; | |
9 | import java.util.logging.Level; | |
10 | ||
11 | import org.lttng.ust.agent.ILttngHandler; | |
12 | import org.lttng.ust.agent.filter.FilterChangeNotifier; | |
13 | import org.lttng.ust.agent.filter.IFilterChangeListener; | |
14 | import org.lttng.ust.agent.jul.LttngLogHandler; | |
15 | import org.lttng.ust.agent.session.EventRule; | |
16 | import org.lttng.ust.agent.session.LogLevelSelector; | |
17 | ||
18 | /** | |
19 | * Example usage of a {@link IFilterChangeListener}. | |
20 | * | |
21 | * This listener will simply print to stdout the notifications it receives. To | |
22 | * try it, run the program, then issue "lttng enable-event" and | |
23 | * "lttng disable-event" commands for the JUL domain. | |
24 | * | |
25 | * @author Alexandre Montplaisir | |
26 | */ | |
a3454bfd | 27 | public class FilterChangeListenerExample { |
4fb826b1 AM |
28 | |
29 | private static class ExampleFilterChangeListener implements IFilterChangeListener { | |
30 | ||
31 | @Override | |
32 | public void eventRuleAdded(EventRule rule) { | |
33 | System.out.println(); | |
34 | System.out.println("New event rule enabled:"); | |
35 | System.out.println("Event name: " + rule.getEventName()); | |
36 | System.out.println(printLogLevel(rule.getLogLevelSelector())); | |
37 | System.out.println("Filter string: " + rule.getFilterString()); | |
38 | } | |
39 | ||
40 | @Override | |
41 | public void eventRuleRemoved(EventRule rule) { | |
42 | System.out.println(); | |
43 | System.out.println("Event rule disabled:"); | |
44 | System.out.println("Event name: " + rule.getEventName()); | |
45 | System.out.println(printLogLevel(rule.getLogLevelSelector())); | |
46 | System.out.println("Filter string: " + rule.getFilterString()); | |
47 | } | |
48 | ||
49 | /** | |
50 | * Convenience method to print integer log level values into their JUL | |
51 | * equivalent. | |
52 | */ | |
53 | private static String printLogLevel(LogLevelSelector lls) { | |
54 | String llname = Level.parse(String.valueOf(lls.getLogLevel())).getName(); | |
55 | return "Log level: " + llname + ", filter type: " + lls.getLogLevelType().toString(); | |
56 | } | |
57 | } | |
58 | ||
59 | /** | |
60 | * Run the program. | |
61 | * | |
62 | * @param args | |
63 | * Command-line arguments (not used) | |
64 | * @throws IOException | |
65 | */ | |
66 | public static void main(String args[]) throws IOException { | |
67 | /* We need at least one log handler to activate the LTTng agent */ | |
68 | ILttngHandler handler = new LttngLogHandler(); | |
69 | ||
70 | /* Create a listener and register it to the manager */ | |
71 | IFilterChangeListener listener = new ExampleFilterChangeListener(); | |
72 | FilterChangeNotifier.getInstance().registerListener(listener); | |
73 | ||
74 | System.out.println("Press Enter to finish."); | |
75 | System.in.read(); | |
76 | ||
77 | /* Unregister the listener */ | |
78 | FilterChangeNotifier.getInstance().unregisterListener(listener); | |
79 | ||
80 | /* Cleanup the log handler we created */ | |
81 | handler.close(); | |
82 | } | |
a3454bfd | 83 | } |