lttng/org.lttng.scope.lttng.kernel.core/src/org/lttng/scope/lttng/kernel/core/activator/internal/LttngAnalysesLoader.java

   1 /*******************************************************************************
   2  * Copyright (c) 2016 EfficiOS Inc., Philippe Proulx
   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
  10 package org.lttng.scope.lttng.kernel.core.activator.internal;
  11
  12 import java.io.IOException;
  13 import java.io.InputStream;
  14 import java.util.Properties;
  15
  16 import org.eclipse.tracecompass.tmf.core.analysis.ondemand.OnDemandAnalysisManager;
  17 import org.eclipse.tracecompass.tmf.core.trace.ITmfTrace;
  18 import org.lttng.scope.lami.core.module.LamiAnalysis;
  19 import org.lttng.scope.lami.core.module.LamiAnalysisFactoryException;
  20 import org.lttng.scope.lami.core.module.LamiAnalysisFactoryFromConfigFile;
  21 import org.lttng.scope.lttng.kernel.core.trace.LttngKernelTrace;
  22 import org.lttng.scope.lttng.kernel.core.trace.layout.ILttngKernelEventLayout;
  23 import org.lttng.scope.lttng.kernel.core.trace.layout.internal.Lttng27EventLayout;
  24
  25 /**
  26  * Loader of LTTng analyses.
  27  *
  28  * @author Philippe Proulx
  29  */
  30 final class LttngAnalysesLoader {
  31
  32     private static final String CONFIG_DIR_NAME = "lttng-analyses-configs"; //$NON-NLS-1$
  33
  34     private LttngAnalysesLoader() {
  35     }
  36
  37     private static boolean appliesTo(ITmfTrace trace) {
  38         /* LTTng-Analysis is supported only on LTTng >= 2.7 kernel traces */
  39         if (trace instanceof LttngKernelTrace) {
  40             final LttngKernelTrace kernelTrace = (LttngKernelTrace) trace;
  41             final ILttngKernelEventLayout layout = kernelTrace.getKernelEventLayout();
  42
  43             if (layout instanceof Lttng27EventLayout) {
  44                 return true;
  45             }
  46         }
  47
  48         return false;
  49     }
  50
  51     private static String[] getAnalysisNames() throws IOException {
  52         final ClassLoader loader = LttngAnalysesLoader.class.getClassLoader();
  53         final String path = "/" + CONFIG_DIR_NAME + "/index.properties"; //$NON-NLS-1$ //$NON-NLS-2$
  54         final String[] names = new String[0];
  55         final Properties indexProps = new Properties();
  56
  57         try (final InputStream in = loader.getResourceAsStream(path)) {
  58             if (in == null) {
  59                 return names;
  60             }
  61
  62             indexProps.load(in);
  63         }
  64
  65         String analyses = indexProps.getProperty("analyses"); //$NON-NLS-1$
  66
  67         if (analyses == null) {
  68             return names;
  69         }
  70
  71         analyses = analyses.trim();
  72         return analyses.split("\\s+"); //$NON-NLS-1$
  73     }
  74
  75     public static void load() throws LamiAnalysisFactoryException, IOException {
  76         final String[] names = getAnalysisNames();
  77         final ClassLoader loader = LttngAnalysesLoader.class.getClassLoader();
  78
  79         for (final String name : names) {
  80             final String path = String.format("/%s/%s.properties", CONFIG_DIR_NAME, name); //$NON-NLS-1$
  81
  82             try (final InputStream in = loader.getResourceAsStream(path)) {
  83                 if (in == null) {
  84                     continue;
  85                 }
  86
  87                 final LamiAnalysis analysis = LamiAnalysisFactoryFromConfigFile.buildFromInputStream(in, false, LttngAnalysesLoader::appliesTo);
  88                 OnDemandAnalysisManager.getInstance().registerAnalysis(analysis);
  89             }
  90         }
  91     }
  92
  93 }