org.eclipse.linuxtools.lttng2.kernel.core/src/org/eclipse/linuxtools/lttng2/kernel/core/trace/CtfKernelTrace.java

   1 /*******************************************************************************
   2  * Copyright (c) 2012 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  *   Alexandre Montplaisir - Initial API and implementation
  11  ******************************************************************************/
  12
  13 package org.eclipse.linuxtools.lttng2.kernel.core.trace;
  14
  15 import java.io.File;
  16 import java.io.IOException;
  17
  18 import org.eclipse.core.resources.IProject;
  19 import org.eclipse.linuxtools.internal.lttng2.kernel.core.stateprovider.CTFKernelStateInput;
  20 import org.eclipse.linuxtools.tmf.core.ctfadaptor.CtfTmfTrace;
  21 import org.eclipse.linuxtools.tmf.core.exceptions.TmfTraceException;
  22 import org.eclipse.linuxtools.tmf.core.statesystem.StateHistorySystem;
  23 import org.eclipse.linuxtools.tmf.core.statesystem.backend.historytree.HistoryTreeBackend;
  24 import org.eclipse.linuxtools.tmf.core.statesystem.helpers.HistoryBuilder;
  25 import org.eclipse.linuxtools.tmf.core.statesystem.helpers.IStateChangeInput;
  26 import org.eclipse.linuxtools.tmf.core.statesystem.helpers.IStateHistoryBackend;
  27
  28 /**
  29  * This is the specification of CtfTmfTrace for use with LTTng 2.x kernel
  30  * traces. It uses the CtfKernelStateInput to generate the state history.
  31  *
  32  * @author alexmont
  33  *
  34  */
  35 public class CtfKernelTrace extends CtfTmfTrace {
  36
  37     public CtfKernelTrace() {
  38         super();
  39     }
  40
  41     @Override
  42     public boolean validate(final IProject project, final String path) {
  43         if (!super.validate(project, path)) {
  44             return false;
  45         }
  46         /* Add extra checks specific to kernel traces here */;
  47         return true;
  48     }
  49
  50     @Override
  51     protected void buildStateSystem() throws TmfTraceException {
  52         /* Set up the path to the history tree file we'll use */
  53         final String htPath = this.getPath() + ".ht";
  54         final File htFile = new File(htPath);
  55
  56         IStateHistoryBackend htBackend;
  57         IStateChangeInput htInput;
  58         HistoryBuilder builder;
  59
  60         /* If the target file already exists, do not rebuild it uselessly */
  61         // TODO for now we assume it's complete. Might be a good idea to check
  62         // at least if its range matches the trace's range.
  63         try {
  64             if (htFile.exists()) {
  65                 /* Load an existing history */
  66                 htBackend = new HistoryTreeBackend(htFile);
  67                 this.ss = new StateHistorySystem(htBackend, false);
  68             } else {
  69                 /* Create a new state history from scratch */
  70                 htInput = new CTFKernelStateInput(this);
  71                 htBackend = new HistoryTreeBackend(htFile,
  72                         htInput.getStartTime());
  73                 builder = new HistoryBuilder(htInput, htBackend);
  74
  75                 // TODO this is blocking for now...
  76                 builder.run();
  77             }
  78         } catch (IOException e) {
  79             throw new TmfTraceException(e.getMessage());
  80         }
  81     }
  82 }