1 /*******************************************************************************
2 * Copyright (c) 2012, 2014 Ericsson
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
10 * Alexandre Montplaisir - Initial API
11 ******************************************************************************/
13 package org
.eclipse
.linuxtools
.tmf
.core
.statistics
;
15 import java
.util
.List
;
18 import org
.eclipse
.linuxtools
.tmf
.core
.timestamp
.ITmfTimestamp
;
21 * Provider for statistics, which is assigned to a trace. This can be used to
22 * populate views like the Statistics View or the Histogram.
24 * As a guideline, since any trace type can use this interface, all timestamps
25 * should be normalized to nanoseconds when using these methods
26 * ({@link ITmfTimestamp#NANOSECOND_SCALE}).
28 * @author Alexandre Montplaisir
31 public interface ITmfStatistics
{
34 * Run a histogram query on the statistics back-end. This means, return the
35 * total number of events in a series of 'nb' equal-sized ranges between
36 * 'start' and 'end'. As its name implies, this is typically used to fill
37 * the histogram data (where each range represents one pixel on the
40 * This method will block the caller until the results are returned, so it
41 * should not be called from a signal handler or from the UI thread.
44 * Start time of the query
46 * End time of the query
48 * The number of ranges to separate the complete time range into.
49 * It will be the size() of the returned array.
50 * @return The array representing the number of events found in each
53 List
<Long
> histogramQuery(long start
, long end
, int nb
);
56 * Return the total number of events in the trace.
58 * @return The total number of events
60 long getEventsTotal();
63 * Return a Map of the total events in the trace, per event type. The event
64 * type should come from ITmfEvent.getType().getName().
66 * @return The map of <event_type, count>, for the whole trace
68 Map
<String
, Long
> getEventTypesTotal();
71 * Retrieve the number of events in the trace in a given time interval.
74 * Start time of the time range
76 * End time of the time range
77 * @return The number of events found
79 long getEventsInRange(long start
, long end
);
82 * Retrieve the number of events in the trace, per event type, in a given
86 * Start time of the time range
88 * End time of the time range
89 * @return The map of <event_type, count>, for the given time range
91 Map
<String
, Long
> getEventTypesInRange(long start
, long end
);
94 * Notify the statistics back-end that the trace is being closed, so it
95 * should dispose itself as appropriate (release file descriptors, etc.)
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