+/*
+ * Copyright (C) 2015 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com>
+ * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
+ *
+ * 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
+ */
+
+package org.lttng.ust.agent.client;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.lttng.ust.agent.AbstractLttngAgent;
+
+/**
+ * Session daemon command asking the Java agent to list its registered loggers,
+ * which corresponds to event names in the tracing session.
+ *
+ * @author Alexandre Montplaisir
+ * @author David Goulet
+ */
+class SessiondListLoggersCommand implements ISessiondCommand {
+
+ @Override
+ public ILttngAgentResponse execute(AbstractLttngAgent<?> agent) {
+ final List<String> loggerList = new ArrayList<String>();
+ int dataSize = 0;
+
+ for (String event : agent.listEnabledEvents()) {
+ loggerList.add(event);
+ dataSize += event.length() + 1;
+ }
+
+ return new SessiondListLoggersResponse(loggerList, dataSize);
+ }
+
+ private static class SessiondListLoggersResponse implements ILttngAgentResponse {
+
+ private final static int SIZE = 12;
+
+ private final List<String> loggers;
+ private final int dataSize;
+
+ public SessiondListLoggersResponse(List<String> loggers, int dataSize) {
+ this.loggers = loggers;
+ this.dataSize = dataSize;
+ }
+
+ @Override
+ public ReturnCode getReturnCode() {
+ /* This command can't really fail */
+ return ILttngAgentResponse.SUCESS_RESPONSE.getReturnCode();
+ }
+
+ @Override
+ public byte[] getBytes() {
+ byte data[] = new byte[SIZE + dataSize];
+ ByteBuffer buf = ByteBuffer.wrap(data);
+ buf.order(ByteOrder.BIG_ENDIAN);
+
+ /* Returned code */
+ buf.putInt(getReturnCode().getCode());
+ buf.putInt(dataSize);
+ buf.putInt(loggers.size());
+
+ for (String logger : loggers) {
+ buf.put(logger.getBytes());
+ /* NULL terminated byte after the logger name. */
+ buf.put((byte) 0x0);
+ }
+ return data;
+ }
+ }
+
+}