Move liblttng-ust-java* to 'src/lib/'

[lttng-ust.git] / src / lib / lttng-ust-java-agent / java / lttng-ust-agent-common / org / lttng / ust / agent / client / SessiondListLoggersCommand.java

diff --git a/src/lib/lttng-ust-java-agent/java/lttng-ust-agent-common/org/lttng/ust/agent/client/SessiondListLoggersCommand.java b/src/lib/lttng-ust-java-agent/java/lttng-ust-agent-common/org/lttng/ust/agent/client/SessiondListLoggersCommand.java
new file mode 100644 (file)
index 0000000..0500055
--- /dev/null
+++ b/src/lib/lttng-ust-java-agent/java/lttng-ust-agent-common/org/lttng/ust/agent/client/SessiondListLoggersCommand.java
@@ -0,0 +1,77 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ * Copyright (C) 2015 EfficiOS Inc.
+ * Copyright (C) 2015 Alexandre Montplaisir <alexmonthy@efficios.com>
+ * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
+ */
+
+package org.lttng.ust.agent.client;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.util.Collection;
+
+/**
+ * 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 extends SessiondCommand {
+
+       @Override
+       public LttngAgentResponse execute(ILttngTcpClientListener agent) {
+               final Collection<String> loggerList = agent.listAvailableEvents();
+               return new SessiondListLoggersResponse(loggerList);
+       }
+
+       private static class SessiondListLoggersResponse extends LttngAgentResponse {
+
+               private final static int SIZE = 12;
+
+               private final Collection<String> loggers;
+
+               public SessiondListLoggersResponse(Collection<String> loggers) {
+                       this.loggers = loggers;
+               }
+
+               @Override
+               public ReturnCode getReturnCode() {
+                       /* This command can't really fail */
+                       return ReturnCode.CODE_SUCCESS_CMD;
+               }
+
+               @Override
+               public byte[] getBytes() {
+                       /*
+                        * Compute the data size, which is the number of bytes of each
+                        * encoded string, +1 per string for the \0
+                        */
+                       int dataSize = 0;
+                       for (String logger : loggers) {
+                               dataSize += logger.getBytes(SESSIOND_PROTOCOL_CHARSET).length + 1;
+                       }
+
+                       /* Prepare the buffer */
+                       byte data[] = new byte[SIZE + dataSize];
+                       ByteBuffer buf = ByteBuffer.wrap(data);
+                       buf.order(ByteOrder.BIG_ENDIAN);
+
+                       /* Write the header section of the response */
+                       buf.putInt(getReturnCode().getCode());
+                       buf.putInt(dataSize);
+                       buf.putInt(loggers.size());
+
+                       /* Write the payload */
+                       for (String logger : loggers) {
+                               buf.put(logger.getBytes(SESSIOND_PROTOCOL_CHARSET));
+                               /* NULL terminated byte after the logger name. */
+                               buf.put((byte) 0x0);
+                       }
+                       return data;
+               }
+       }
+
+}