--- /dev/null
+/*
+ * 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.jul;
+
+import java.util.concurrent.Semaphore;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.lang.Integer;
+import java.io.IOException;
+import java.io.BufferedOutputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutputStream;
+import java.io.DataInputStream;
+import java.net.*;
+import java.lang.management.ManagementFactory;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Timer;
+import java.util.TimerTask;
+
+class USTRegisterMsg {
+ public static int pid;
+}
+
+public class LTTngTCPSessiondClient {
+ /* Command header from the session deamon. */
+ private LTTngSessiondCmd2_4.sessiond_hdr headerCmd =
+ new LTTngSessiondCmd2_4.sessiond_hdr();
+
+ private final String sessiondHost;
+ private final int sessiondPort;
+ private Socket sessiondSock;
+ private boolean quit = false;
+
+ private DataInputStream inFromSessiond;
+ private DataOutputStream outToSessiond;
+
+ private LTTngLogHandler handler;
+
+ private Semaphore registerSem;
+
+ private Timer eventTimer;
+ private List<String> enabledEventList = new ArrayList<String>();
+ /* Timer delay at each 5 seconds. */
+ private final static long timerDelay = 5 * 1000;
+ private static boolean timerInitialized;
+
+ public LTTngTCPSessiondClient(String host, int port, Semaphore sem) {
+ this.sessiondHost = host;
+ this.sessiondPort = port;
+ this.registerSem = sem;
+ this.eventTimer = new Timer();
+ this.timerInitialized = false;
+ }
+
+ private void setupEventTimer() {
+ if (this.timerInitialized) {
+ return;
+ }
+
+ this.eventTimer.scheduleAtFixedRate(new TimerTask() {
+ @Override
+ public void run() {
+ /*
+ * We have to make a copy here since it is possible that the
+ * enabled event list is changed during an iteration on it.
+ */
+ List<String> tmpList = new ArrayList<String>(enabledEventList);
+
+ LTTngSessiondCmd2_4.sessiond_enable_handler enableCmd = new
+ LTTngSessiondCmd2_4.sessiond_enable_handler();
+ for (String strEventName: tmpList) {
+ enableCmd.name = strEventName;
+ if (enableCmd.execute(handler) == null) {
+ enabledEventList.remove(strEventName);
+ }
+ }
+ }
+ }, this.timerDelay, this.timerDelay);
+
+ this.timerInitialized = true;
+ }
+
+ public void init(LTTngLogHandler handler) throws InterruptedException {
+ this.handler = handler;
+
+ for (;;) {
+ if (this.quit) {
+ break;
+ }
+
+ try {
+
+ /*
+ * Connect to the session daemon before anything else.
+ */
+ connectToSessiond();
+
+ /*
+ * Register to the session daemon as the Java component of the
+ * UST application.
+ */
+ registerToSessiond();
+ this.registerSem.release();
+
+ setupEventTimer();
+
+ /*
+ * Block on socket receive and wait for command from the
+ * session daemon. This will return if and only if there is a
+ * fatal error or the socket closes.
+ */
+ handleSessiondCmd();
+ } catch (UnknownHostException uhe) {
+ this.registerSem.release();
+ System.out.println(uhe);
+ } catch (IOException ioe) {
+ this.registerSem.release();
+ Thread.sleep(3000);
+ } catch (Exception e) {
+ this.registerSem.release();
+ e.printStackTrace();
+ }
+ }
+ }
+
+ public void destroy() {
+ this.quit = true;
+ this.eventTimer.cancel();
+
+ try {
+ if (this.sessiondSock != null) {
+ this.sessiondSock.close();
+ }
+ } catch (Exception e) {
+ e.printStackTrace();
+ }
+ }
+
+ /*
+ * Receive header data from the session daemon using the LTTng command
+ * static buffer of the right size.
+ */
+ private void recvHeader() throws Exception {
+ int read_len;
+ byte data[] = new byte[this.headerCmd.SIZE];
+
+ read_len = this.inFromSessiond.read(data, 0, data.length);
+ if (read_len != data.length) {
+ throw new IOException();
+ }
+ this.headerCmd.populate(data);
+ }
+
+ /*
+ * Receive payload from the session daemon. This MUST be done after a
+ * recvHeader() so the header value of a command are known.
+ *
+ * The caller SHOULD use isPayload() before which returns true if a payload
+ * is expected after the header.
+ */
+ private byte[] recvPayload() throws Exception {
+ byte payload[] = new byte[(int) this.headerCmd.data_size];
+
+ /* Failsafe check so we don't waste our time reading 0 bytes. */
+ if (payload.length == 0) {
+ return null;
+ }
+
+ this.inFromSessiond.read(payload, 0, payload.length);
+ return payload;
+ }
+
+ /*
+ * Handle session command from the session daemon.
+ */
+ private void handleSessiondCmd() throws Exception {
+ int ret_code;
+ byte data[] = null;
+
+ while (true) {
+ /* Get header from session daemon. */
+ recvHeader();
+
+ if (headerCmd.data_size > 0) {
+ data = recvPayload();
+ }
+
+ switch (headerCmd.cmd) {
+ case CMD_LIST:
+ {
+ LTTngSessiondCmd2_4.sessiond_list_logger listLoggerCmd =
+ new LTTngSessiondCmd2_4.sessiond_list_logger();
+ listLoggerCmd.execute(this.handler);
+ data = listLoggerCmd.getBytes();
+ break;
+ }
+ case CMD_ENABLE:
+ {
+ String event_name;
+ LTTngSessiondCmd2_4.sessiond_enable_handler enableCmd =
+ new LTTngSessiondCmd2_4.sessiond_enable_handler();
+ if (data == null) {
+ enableCmd.code = LTTngSessiondCmd2_4.lttng_jul_ret_code.CODE_INVALID_CMD;
+ break;
+ }
+ enableCmd.populate(data);
+ event_name = enableCmd.execute(this.handler);
+ if (event_name != null) {
+ /*
+ * Add the event to the list so it can be enabled if
+ * the logger appears at some point in time.
+ */
+ enabledEventList.add(event_name);
+ }
+ data = enableCmd.getBytes();
+ break;
+ }
+ case CMD_DISABLE:
+ {
+ LTTngSessiondCmd2_4.sessiond_disable_handler disableCmd =
+ new LTTngSessiondCmd2_4.sessiond_disable_handler();
+ if (data == null) {
+ disableCmd.code = LTTngSessiondCmd2_4.lttng_jul_ret_code.CODE_INVALID_CMD;
+ break;
+ }
+ disableCmd.populate(data);
+ disableCmd.execute(this.handler);
+ data = disableCmd.getBytes();
+ break;
+ }
+ default:
+ {
+ data = new byte[4];
+ ByteBuffer buf = ByteBuffer.wrap(data);
+ buf.order(ByteOrder.BIG_ENDIAN);
+ LTTngSessiondCmd2_4.lttng_jul_ret_code code =
+ LTTngSessiondCmd2_4.lttng_jul_ret_code.CODE_INVALID_CMD;
+ buf.putInt(code.getCode());
+ break;
+ }
+ }
+
+ /* Send payload to session daemon. */
+ this.outToSessiond.write(data, 0, data.length);
+ this.outToSessiond.flush();
+ }
+ }
+
+ private void connectToSessiond() throws Exception {
+ this.sessiondSock = new Socket(this.sessiondHost, this.sessiondPort);
+ this.inFromSessiond = new DataInputStream(
+ sessiondSock.getInputStream());
+ this.outToSessiond = new DataOutputStream(
+ sessiondSock.getOutputStream());
+ }
+
+ private void registerToSessiond() throws Exception {
+ byte data[] = new byte[4];
+ ByteBuffer buf = ByteBuffer.wrap(data);
+ String pid = ManagementFactory.getRuntimeMXBean().getName().split("@")[0];
+
+ buf.putInt(Integer.parseInt(pid));
+ this.outToSessiond.write(data, 0, data.length);
+ this.outToSessiond.flush();
+ }
+}
projects / lttng-ust.git / blobdiff