source: s10k/XmlTools/xmlcustomcode.cpp @ 1112

Last change on this file since 1112 was 1112, checked in by s10k, 13 months ago

Fix a deadlock, v2.0f

File size: 6.3 KB
Line 
1#include "xmlcustomcode.h"
2
3XmlCustomCode* XmlCustomCode::uniqueInstance = NULL;
4
5QScriptValue echo(QScriptContext *context, QScriptEngine*)
6{
7    std::cout << context->argument(0).toString().toUtf8().constData() << std::endl;
8
9    return "";
10}
11
12XmlCustomCode::XmlCustomCode(): numThreads(QThread::idealThreadCount())
13{
14    myThreadPool.setMaxThreadCount(numThreads);
15    myThreadPool.setExpiryTimeout(-1); // don't let threads expire
16
17    // create individual thread script engines
18    this->jsScriptEngines.reserve(this->numThreads);
19
20    QString jsxmlString;
21    QFile jsxmlfile(":/resources/libs/jsxml.js");
22
23    jsxmlfile.open(QFile::ReadOnly | QFile::Text);
24
25    jsxmlString=QTextStream(&jsxmlfile).readAll();
26
27    for(int i=0; i<this->numThreads; i++){
28
29        jsCustomCodeEngine e;
30
31        e.scriptEngine = new QScriptEngine();
32        e.jsFunction = new QScriptValue();
33
34        // main needs to be called so the user code is evaluated
35        // alternatively you can do: myFunc=engine.evaluate('(function main(){})'); myFunc.call();
36        // Note the () around the function
37        e.getXmlDataFunction = new QScriptValue(e.scriptEngine->evaluate("(function getXmlData() { return $xmlData; })"));
38        e.setXmlDataFunction = new QScriptValue(e.scriptEngine->evaluate("(function setXmlData(newXmlData) { $xmlData=newXmlData; })"));
39        e.mutexForEngine = new QMutex;
40
41        // Add echo function so user can debug the code
42        QScriptValue echoFunction = e.scriptEngine->newFunction(echo);
43        e.scriptEngine->globalObject().setProperty("echo", echoFunction);
44
45        // Add the js library for XmlEditing
46        e.scriptEngine->evaluate(jsxmlString);
47
48        this->jsScriptEngines.append(e);
49    }
50}
51
52XmlCustomCode* XmlCustomCode::getInstance(){
53
54    if (uniqueInstance==NULL){   // allow only one instance
55        uniqueInstance = new XmlCustomCode();
56    }
57
58    return uniqueInstance;
59}
60
61void XmlCustomCode::executeCustomCode(const QString &jsString, const QVector<QString> &filesToProcess, const bool backupsEnabled, const bool verboseEnabled){
62
63    // Reconstruct script functions
64    for(int i=0; i<this->numThreads; i++){
65        *(jsScriptEngines[i].jsFunction) = jsScriptEngines.at(i).scriptEngine->evaluate("(function main() {"+jsString+"})");
66    }
67
68    QString currXmlFileString;
69
70    QScriptValue engineResult; // variable to check for js_errors
71    double elapsed_secs=0; // elapsed seconds that a user script took
72    clock_t begin; // seconds that a script started
73
74    // Single tread if small number of files or number of threads = 1
75    if(filesToProcess.size()<=CUSTOM_FILES_PER_THREAD || numThreads == 1){
76
77        jsCustomCodeEngine &jsEngine = this->jsScriptEngines.first();
78
79        // Process all XmlFiles
80        for(int i=0; i<filesToProcess.size(); i++){
81            customCodeUnwinding(filesToProcess.at(i),currXmlFileString,*jsEngine.scriptEngine,begin,elapsed_secs,engineResult,
82                                *jsEngine.jsFunction,*jsEngine.getXmlDataFunction,*jsEngine.setXmlDataFunction,backupsEnabled,verboseEnabled);
83        }
84    }
85    else{ // Multithread if there are many files
86        // Process all XmlFiles
87
88        QVector<QFuture<void>> executingThreads;
89
90        for(int i=0, iteration = 0; i<=filesToProcess.size()-CUSTOM_FILES_PER_THREAD; i+=CUSTOM_FILES_PER_THREAD, ++iteration){
91
92            executingThreads << QtConcurrent::run(&this->myThreadPool, [=]()
93            {
94
95                const int indexJsEngine = iteration % this->numThreads;
96
97                jsCustomCodeEngine &jsEngine = this->jsScriptEngines[indexJsEngine];
98
99                jsEngine.mutexForEngine->lock();
100
101                QString currXmlFileStringThread;
102
103                QScriptValue engineResultThread; // variable to check for js_errors
104                double elapsedSecsThread=0; // elapsed seconds that a user script took
105                clock_t beginThread; // seconds that a script started
106
107                customCodeUnwinding(filesToProcess.at(i),currXmlFileStringThread,*jsEngine.scriptEngine,beginThread,elapsedSecsThread,engineResultThread,
108                                    *jsEngine.jsFunction,*jsEngine.getXmlDataFunction,*jsEngine.setXmlDataFunction,backupsEnabled,verboseEnabled);
109
110                customCodeUnwinding(filesToProcess.at(i+1),currXmlFileStringThread,*jsEngine.scriptEngine,beginThread,elapsedSecsThread,engineResultThread,
111                                    *jsEngine.jsFunction,*jsEngine.getXmlDataFunction,*jsEngine.setXmlDataFunction,backupsEnabled,verboseEnabled);
112
113                customCodeUnwinding(filesToProcess.at(i+2),currXmlFileStringThread,*jsEngine.scriptEngine,beginThread,elapsedSecsThread,engineResultThread,
114                                    *jsEngine.jsFunction,*jsEngine.getXmlDataFunction,*jsEngine.setXmlDataFunction,backupsEnabled,verboseEnabled);
115
116                customCodeUnwinding(filesToProcess.at(i+3),currXmlFileStringThread,*jsEngine.scriptEngine,beginThread,elapsedSecsThread,engineResultThread,
117                                    *jsEngine.jsFunction,*jsEngine.getXmlDataFunction,*jsEngine.setXmlDataFunction,backupsEnabled,verboseEnabled);
118
119                jsEngine.mutexForEngine->unlock();
120            });
121        }
122
123        // Wait for all threads to finish
124        for(QFuture<void> &f :executingThreads){
125            f.waitForFinished();
126        }
127
128        if(filesToProcess.size()%CUSTOM_FILES_PER_THREAD!=0){
129
130            int alreadyProcessedFiles=(filesToProcess.size()/CUSTOM_FILES_PER_THREAD)*CUSTOM_FILES_PER_THREAD;
131
132            jsCustomCodeEngine &jsEngine = this->jsScriptEngines.first();
133
134            for(int i=alreadyProcessedFiles; i<filesToProcess.size(); i++){
135
136                customCodeUnwinding(filesToProcess.at(i),currXmlFileString,*jsEngine.scriptEngine,begin,elapsed_secs,engineResult,
137                                    *jsEngine.jsFunction,*jsEngine.getXmlDataFunction,*jsEngine.setXmlDataFunction,backupsEnabled,verboseEnabled);
138            }
139        }
140    }
141}
142
143void XmlCustomCode::displayJsException(QScriptEngine &engine, QScriptValue &engineResult){
144    if (engine.hasUncaughtException()) {
145        UtilXmlTools::displayErrorMessage("@CUSTOM_CODE","Uncaught js exception (user code) at line " +QString::number(engine.uncaughtExceptionLineNumber()) + ":\n" + engineResult.toString());
146    }
147}
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