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1 | /******************************************************************************* |
2 | * Copyright (c) 2012 Ericsson | |
3 | * Copyright (c) 2010, 2011 École Polytechnique de Montréal | |
4 | * Copyright (c) 2010, 2011 Alexandre Montplaisir <alexandre.montplaisir@gmail.com> | |
83134537 | 5 | * |
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6 | * All rights reserved. This program and the accompanying materials are |
7 | * made available under the terms of the Eclipse Public License v1.0 which | |
8 | * accompanies this distribution, and is available at | |
9 | * http://www.eclipse.org/legal/epl-v10.html | |
83134537 | 10 | * |
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11 | *******************************************************************************/ |
12 | ||
13 | package org.eclipse.linuxtools.tmf.core.statesystem; | |
14 | ||
15 | import java.io.File; | |
16 | import java.io.IOException; | |
17 | ||
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18 | import org.eclipse.linuxtools.internal.tmf.core.statesystem.HistoryBuilder; |
19 | import org.eclipse.linuxtools.internal.tmf.core.statesystem.IStateHistoryBackend; | |
20 | import org.eclipse.linuxtools.internal.tmf.core.statesystem.historytree.HistoryTreeBackend; | |
21 | import org.eclipse.linuxtools.internal.tmf.core.statesystem.historytree.ThreadedHistoryTreeBackend; | |
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22 | import org.eclipse.linuxtools.tmf.core.component.TmfComponent; |
23 | import org.eclipse.linuxtools.tmf.core.exceptions.TmfTraceException; | |
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24 | |
25 | /** | |
26 | * This abstract manager class handles loading or creating state history files | |
27 | * for use in TMF's generic state system. | |
83134537 | 28 | * |
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29 | * @version 1.0 |
30 | * @author Alexandre Montplaisir | |
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31 | */ |
32 | public abstract class StateSystemManager extends TmfComponent { | |
33 | ||
34 | /** Size of the blocking queue to use when building a state history */ | |
35 | private final static int QUEUE_SIZE = 10000; | |
36 | ||
37 | /** | |
38 | * Load the history file matching the target trace. If the file already | |
39 | * exists, it will be opened directly. If not, it will be created from | |
40 | * scratch. In the case the history has to be built, it's possible to block | |
41 | * the calling thread until construction is complete. | |
83134537 | 42 | * |
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43 | * @param htFile |
44 | * The target name of the history file we want to use. If it | |
45 | * exists it will be opened. If it doesn't, a new file will be | |
46 | * created with this name/path. | |
47 | * @param htInput | |
48 | * The IStateChangeInput to use for building the history file. It | |
49 | * may be required even if we are opening an already-existing | |
50 | * history (ie, for partial histories). | |
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51 | * @param buildManually |
52 | * If false, the construction will wait for a signal before | |
53 | * starting. If true, it will build everything right now and | |
54 | * block the caller. It has no effect if the file already exists. | |
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55 | * @return A IStateSystemQuerier handler to the state system, with which you |
56 | * can then run queries on the history. | |
57 | * @throws TmfTraceException | |
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58 | * If there was a problem reading or writing one of the files. |
59 | * See the contents of this exception for more info. | |
f1f86dfb | 60 | * @since 2.0 |
6e71ce46 | 61 | */ |
f1f86dfb | 62 | public static ITmfStateSystem loadStateHistory(File htFile, |
e34f7caa | 63 | IStateChangeInput htInput, boolean buildManually) |
51e216bd | 64 | throws TmfTraceException { |
f1f86dfb | 65 | ITmfStateSystem ss; |
6e71ce46 | 66 | IStateHistoryBackend htBackend; |
51e216bd | 67 | |
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68 | /* If the target file already exists, do not rebuild it uselessly */ |
69 | // TODO for now we assume it's complete. Might be a good idea to check | |
70 | // at least if its range matches the trace's range. | |
71 | if (htFile.exists()) { | |
72 | /* Load an existing history */ | |
73 | try { | |
74 | htBackend = new HistoryTreeBackend(htFile); | |
75 | ss = HistoryBuilder.openExistingHistory(htBackend); | |
76 | return ss; | |
77 | } catch (IOException e) { | |
78 | /* | |
79 | * There was an error opening the existing file. Perhaps it was | |
80 | * corrupted, perhaps it's an old version? We'll just | |
81 | * fall-through and try to build a new one from scratch instead. | |
82 | */ | |
83 | } | |
84 | } | |
85 | ||
86 | /* Create a new state history from scratch */ | |
87 | HistoryBuilder builder; | |
51e216bd | 88 | |
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89 | if (htInput == null) { |
90 | return null; | |
91 | } | |
92 | try { | |
93 | htBackend = new ThreadedHistoryTreeBackend(htFile, | |
94 | htInput.getStartTime(), QUEUE_SIZE); | |
e34f7caa | 95 | builder = new HistoryBuilder(htInput, htBackend, buildManually); |
6e71ce46 | 96 | } catch (IOException e) { |
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97 | /* |
98 | * If it fails here however, it means there was a problem writing to | |
99 | * the disk, so throw a real exception this time. | |
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100 | */ |
101 | throw new TmfTraceException(e.toString(), e); | |
102 | } | |
103 | return builder.getStateSystemQuerier(); | |
104 | } | |
105 | } |