X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=liblttng-ust-java-agent%2Fjava%2Flttng-ust-agent-jul%2Forg%2Flttng%2Fust%2Fagent%2Fjul%2FLttngJulAgent.java;h=99c5fde0cc4b5fb2cc2bb8ca55d4c7a14c81aedb;hb=c0c0989ab70574e09b2f7e8b48c2da6af664a849;hp=fa92f64541b04788af12015bc3fa8d30343466d9;hpb=d60dfbe48a0ceff16852f46419bcbc405502c61d;p=lttng-ust.git

diff --git a/liblttng-ust-java-agent/java/lttng-ust-agent-jul/org/lttng/ust/agent/jul/LttngJulAgent.java b/liblttng-ust-java-agent/java/lttng-ust-agent-jul/org/lttng/ust/agent/jul/LttngJulAgent.java
index fa92f645..99c5fde0 100644
--- a/liblttng-ust-java-agent/java/lttng-ust-agent-jul/org/lttng/ust/agent/jul/LttngJulAgent.java
+++ b/liblttng-ust-java-agent/java/lttng-ust-agent-jul/org/lttng/ust/agent/jul/LttngJulAgent.java
@@ -1,22 +1,21 @@
 /*
- * Copyright (C) 2015 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  *
- * This library is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License, version 2.1 only,
- * as published by the Free Software Foundation.
- *
- * This library is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
- * for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * Copyright (C) 2015 EfficiOS Inc.
+ * Copyright (C) 2015 Alexandre Montplaisir <alexmonthy@efficios.com>
  */
 
 package org.lttng.ust.agent.jul;
 
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+import java.util.TreeSet;
+import java.util.logging.Handler;
+import java.util.logging.LogManager;
+import java.util.logging.Logger;
+
 import org.lttng.ust.agent.AbstractLttngAgent;
 
 /**
@@ -39,4 +38,54 @@ class LttngJulAgent extends AbstractLttngAgent<LttngLogHandler> {
 		return instance;
 	}
 
+	@Override
+	public Collection<String> listAvailableEvents() {
+		Set<String> ret = new TreeSet<String>();
+
+		List<String> loggersNames = Collections.list(LogManager.getLogManager().getLoggerNames());
+		for (String name : loggersNames) {
+			/*
+			 * Skip the root logger. An empty string is not a valid event name
+			 * in LTTng.
+			 */
+			if (name.equals("") || name.equals("global")) {
+				continue;
+			}
+
+			/*
+			 * Check if that logger has at least one LTTng JUL handler attached.
+			 */
+			Logger logger = Logger.getLogger(name);
+			if (hasLttngHandlerAttached(logger)) {
+				ret.add(name);
+			}
+		}
+
+		return ret;
+	}
+
+	private static boolean hasLttngHandlerAttached(Logger logger) {
+		for (Handler handler : logger.getHandlers()) {
+			if (handler instanceof LttngLogHandler) {
+				return true;
+			}
+		}
+
+		/*
+		 * A parent logger, if any, may be connected to an LTTng handler. In
+		 * this case, we will want to include this child logger in the output,
+		 * since it will be accessible by LTTng.
+		 */
+		Logger parent = logger.getParent();
+		if (parent != null) {
+			return hasLttngHandlerAttached(parent);
+		}
+
+		/*
+		 * We have reached the root logger and have not found any LTTng handler,
+		 * this event will not be accessible.
+		 */
+		return false;
+	}
+
 }