org.eclipse.linuxtools.lttng2.ui/src/org/eclipse/linuxtools/internal/lttng2/ui/views/control/service/LTTngControlServiceFactory.java

   1 /**********************************************************************
   2  * Copyright (c) 2012, 2013. 2013 Ericsson
   3  *
   4  * All rights reserved. This program and the accompanying materials are
   5  * made available under the terms of the Eclipse Public License v1.0 which
   6  * accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *   Bernd Hufmann - Initial API and implementation
  11  **********************************************************************/
  12 package org.eclipse.linuxtools.internal.lttng2.ui.views.control.service;
  13
  14 import java.util.regex.Matcher;
  15
  16 import org.eclipse.core.commands.ExecutionException;
  17 import org.eclipse.core.runtime.NullProgressMonitor;
  18 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.logging.ControlCommandLogger;
  19 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.messages.Messages;
  20 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.preferences.ControlPreferences;
  21 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.remote.ICommandResult;
  22 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.remote.ICommandShell;
  23
  24 /**
  25  * <p>
  26  * Factory to create LTTngControlService instances depending on the version of the LTTng Trace Control
  27  * installed on the remote host.
  28  * </p>
  29  *
  30  * @author Bernd Hufmann
  31  */
  32 public class LTTngControlServiceFactory {
  33
  34     // ------------------------------------------------------------------------
  35     // Attributes
  36     // ------------------------------------------------------------------------
  37     /**
  38      * The singleton instance.
  39      */
  40     private static LTTngControlServiceFactory fInstance = null;
  41
  42     // ------------------------------------------------------------------------
  43     // Constructor
  44     // ------------------------------------------------------------------------
  45     /**
  46      * Constructor
  47      */
  48     private LTTngControlServiceFactory() {
  49     }
  50
  51     // ------------------------------------------------------------------------
  52     // Accessors
  53     // ------------------------------------------------------------------------
  54     /**
  55      * @return the LTTngControlServiceFactory singleton instance.
  56      */
  57     public static synchronized LTTngControlServiceFactory getInstance() {
  58         if (fInstance == null) {
  59             fInstance = new LTTngControlServiceFactory();
  60         }
  61         return fInstance;
  62     }
  63
  64     // ------------------------------------------------------------------------
  65     // Factory method
  66     // ------------------------------------------------------------------------
  67     /**
  68      * Gets the LTTng Control Service implementation based on the version of the
  69      * remote LTTng Tools.
  70      *
  71      * @param shell - the shell implementation to pass to the service
  72      * @return - LTTng Control Service implementation
  73      * @throws ExecutionException If the command fails
  74      */
  75     public ILttngControlService getLttngControlService(ICommandShell shell) throws ExecutionException {
  76         // get the version
  77         String command = LTTngControlServiceConstants.CONTROL_COMMAND + LTTngControlServiceConstants.COMMAND_VERSION;
  78
  79         if (ControlPreferences.getInstance().isLoggingEnabled()) {
  80             ControlCommandLogger.log(command);
  81         }
  82         ICommandResult result = null;
  83
  84         try {
  85             result = shell.executeCommand(command, new NullProgressMonitor());
  86         } catch (ExecutionException e) {
  87             throw new ExecutionException(Messages.TraceControl_GettingVersionError + ": " + e); //$NON-NLS-1$
  88         }
  89
  90         if (ControlPreferences.getInstance().isLoggingEnabled()) {
  91             ControlCommandLogger.log(LTTngControlService.formatOutput(result));
  92         }
  93
  94         if ((result != null) && (result.getResult() == 0) && (result.getOutput().length >= 1)) {
  95             int index = 0;
  96             while (index < result.getOutput().length) {
  97                 String line = result.getOutput()[index];
  98                 Matcher versionMatcher = LTTngControlServiceConstants.VERSION_PATTERN.matcher(line);
  99                 if (versionMatcher.matches()) {
 100                     String version = versionMatcher.group(1).trim();
 101                     Matcher matcher = LTTngControlServiceConstants.VERSION_2_PATTERN.matcher(version);
 102                     if (matcher.matches()) {
 103                         LTTngControlService service = new LTTngControlService(shell);
 104                         service.setVersion(version);
 105                         return service;
 106                     }
 107                     throw new ExecutionException(Messages.TraceControl_UnsupportedVersionError + ": " + version); //$NON-NLS-1$
 108                 }
 109                 index++;
 110             }
 111         }
 112         throw new ExecutionException(Messages.TraceControl_GettingVersionError);
 113     }
 114 }