org.eclipse.linuxtools.tmf.core/src/org/eclipse/linuxtools/tmf/core/trace/ITmfTraceWithPreDefinedEvents.java

   1 /*******************************************************************************
   2  * Copyright (c) 2014 École Polytechnique de Montréal, 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  *   Geneviève Bastien - Initial API and implementation
  11  *   Matthew Khouzam - Initial API and implementation
  12  *******************************************************************************/
  13
  14 package org.eclipse.linuxtools.tmf.core.trace;
  15
  16 import java.util.Set;
  17
  18 import org.eclipse.linuxtools.tmf.core.event.ITmfEventType;
  19
  20 /**
  21  * This interface should be implemented by all trace classes who have a way to
  22  * know in advance what events it may contain. It allows analyses and other
  23  * external components to ask the list of events for the trace might contain.
  24  *
  25  * The methods from this interface will typically be called to determine whether
  26  * or not it is worth reading a trace. If we can know in advance that a trace
  27  * does not contain the events required by an analysis, then the analysis will
  28  * not be run. So the response should not involve having to actually read the
  29  * trace.
  30  *
  31  * @author Geneviève Bastien
  32  * @author Matthew Khouzam
  33  * @since 3.0
  34  */
  35 public interface ITmfTraceWithPreDefinedEvents {
  36
  37     /**
  38      * Return a set of event types declared in the trace, without actually
  39      * reading the trace. This method can be called before reading a trace but
  40      * after it is initialized, in order to compare this set with a set of
  41      * events that a request handles, to determine whether or not it is worth
  42      * reading the trace.
  43      *
  44      * Some trace types have ways to determine the events that were traced
  45      * without having to read the whole trace and this is what this method will
  46      * query. The presence of an event in the returned set does not guarantee
  47      * that an event with this name actually happened during this trace, only
  48      * that it can be there.
  49      *
  50      * The set should be immutable. Destructive set operations should be
  51      * performed on a copy of this set.A helper class
  52      * {@link TmfEventTypeCollectionHelper} will provide ways of working with
  53      * this data structure.
  54      *
  55      * @return The set of events that might be present in the trace
  56      */
  57     Set<ITmfEventType> getContainedEventTypes();
  58
  59 }