/*
- * 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;
/**
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;
+ }
+
}