| 1 | /* |
| 2 | * SPDX-License-Identifier: MIT |
| 3 | * |
| 4 | * Copyright (C) 2015 EfficiOS Inc. |
| 5 | * Copyright (C) 2015 Alexandre Montplaisir <alexmonthy@efficios.com> |
| 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 | */ |
| 27 | public class FilterChangeListenerExample { |
| 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 | } |
| 83 | } |