| 1 | /* |
| 2 | * Copyright (C) 2015 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com> |
| 3 | * |
| 4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 5 | * of this software and associated documentation files (the "Software"), to |
| 6 | * deal in the Software without restriction, including without limitation the |
| 7 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| 8 | * sell copies of the Software, and to permit persons to whom the Software is |
| 9 | * furnished to do so, subject to the following conditions: |
| 10 | * |
| 11 | * The above copyright notice and this permission notice shall be included in |
| 12 | * all copies or substantial portions of the Software. |
| 13 | * |
| 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 19 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| 20 | * IN THE SOFTWARE. |
| 21 | */ |
| 22 | |
| 23 | import java.io.IOException; |
| 24 | import java.util.logging.Level; |
| 25 | |
| 26 | import org.lttng.ust.agent.ILttngHandler; |
| 27 | import org.lttng.ust.agent.filter.FilterChangeNotifier; |
| 28 | import org.lttng.ust.agent.filter.IFilterChangeListener; |
| 29 | import org.lttng.ust.agent.jul.LttngLogHandler; |
| 30 | import org.lttng.ust.agent.session.EventRule; |
| 31 | import org.lttng.ust.agent.session.LogLevelSelector; |
| 32 | |
| 33 | /** |
| 34 | * Example usage of a {@link IFilterChangeListener}. |
| 35 | * |
| 36 | * This listener will simply print to stdout the notifications it receives. To |
| 37 | * try it, run the program, then issue "lttng enable-event" and |
| 38 | * "lttng disable-event" commands for the JUL domain. |
| 39 | * |
| 40 | * @author Alexandre Montplaisir |
| 41 | */ |
| 42 | public class FilterChangeListenerExample { |
| 43 | |
| 44 | private static class ExampleFilterChangeListener implements IFilterChangeListener { |
| 45 | |
| 46 | @Override |
| 47 | public void eventRuleAdded(EventRule rule) { |
| 48 | System.out.println(); |
| 49 | System.out.println("New event rule enabled:"); |
| 50 | System.out.println("Event name: " + rule.getEventName()); |
| 51 | System.out.println(printLogLevel(rule.getLogLevelSelector())); |
| 52 | System.out.println("Filter string: " + rule.getFilterString()); |
| 53 | } |
| 54 | |
| 55 | @Override |
| 56 | public void eventRuleRemoved(EventRule rule) { |
| 57 | System.out.println(); |
| 58 | System.out.println("Event rule disabled:"); |
| 59 | System.out.println("Event name: " + rule.getEventName()); |
| 60 | System.out.println(printLogLevel(rule.getLogLevelSelector())); |
| 61 | System.out.println("Filter string: " + rule.getFilterString()); |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * Convenience method to print integer log level values into their JUL |
| 66 | * equivalent. |
| 67 | */ |
| 68 | private static String printLogLevel(LogLevelSelector lls) { |
| 69 | String llname = Level.parse(String.valueOf(lls.getLogLevel())).getName(); |
| 70 | return "Log level: " + llname + ", filter type: " + lls.getLogLevelType().toString(); |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Run the program. |
| 76 | * |
| 77 | * @param args |
| 78 | * Command-line arguments (not used) |
| 79 | * @throws IOException |
| 80 | */ |
| 81 | public static void main(String args[]) throws IOException { |
| 82 | /* We need at least one log handler to activate the LTTng agent */ |
| 83 | ILttngHandler handler = new LttngLogHandler(); |
| 84 | |
| 85 | /* Create a listener and register it to the manager */ |
| 86 | IFilterChangeListener listener = new ExampleFilterChangeListener(); |
| 87 | FilterChangeNotifier.getInstance().registerListener(listener); |
| 88 | |
| 89 | System.out.println("Press Enter to finish."); |
| 90 | System.in.read(); |
| 91 | |
| 92 | /* Unregister the listener */ |
| 93 | FilterChangeNotifier.getInstance().unregisterListener(listener); |
| 94 | |
| 95 | /* Cleanup the log handler we created */ |
| 96 | handler.close(); |
| 97 | } |
| 98 | } |