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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include <app/app_version.h>
#include <utils/async.h>
#include <utils/filesearch.h>
#include <utils/launcherinterface.h>
#include <utils/scopedtimer.h>
#include <utils/temporarydirectory.h>
#include <QDirIterator>
#include <QObject>
#include <QTemporaryDir>
#include <QtTest>
#include <unordered_set>
using namespace Tasking;
using namespace Utils;
static const int s_subDirsCount = 8;
static const int s_subFilesCount = 8;
static const int s_treeDepth = 4;
static const QDir::Filters s_filters = QDir::Dirs | QDir::Files | QDir::Hidden
| QDir::NoDotAndDotDot;
static const char s_dirPrefix[] = "dir_";
static const char s_filePrefix[] = "file_";
static int expectedDirsCountHelper(int depth)
{
if (depth == 1)
return s_subDirsCount + 1; // +1 -> dir itself
return expectedDirsCountHelper(depth - 1) * s_subDirsCount + 1; // +1 -> dir itself
}
static int expectedDirsCount(int tasksCount)
{
return expectedDirsCountHelper(s_treeDepth) * tasksCount + 1; // +1 -> root temp dir
}
static int expectedFilesCountHelper(int depth)
{
if (depth == 0)
return s_subFilesCount;
return expectedFilesCountHelper(depth - 1) * s_subDirsCount + s_subFilesCount;
}
static int expectedFilesCount(int tasksCount)
{
return expectedFilesCountHelper(s_treeDepth) * tasksCount + 1; // +1 -> fileTemplate.txt
}
static void generate(QPromise<void> &promise, const QString &parentPath,
const QString &templateFile, int depth)
{
const QDir parentDir(parentPath);
for (int i = 0; i < s_subFilesCount; ++i)
QFile::copy(templateFile, parentDir.filePath(QString("%1%2").arg(s_filePrefix).arg(i)));
if (depth == 0)
return;
if (promise.isCanceled())
return;
const QString templateDir("dirTemplate");
if (!parentDir.mkdir(templateDir)) {
promise.future().cancel();
return;
}
const QString templateDirPath = parentDir.filePath(templateDir);
generate(promise, templateDirPath, templateFile, depth - 1);
if (promise.isCanceled())
return;
for (int i = 0; i < s_subDirsCount - 1; ++i) {
const QString dirName = QString("%1%2").arg(s_dirPrefix).arg(i);
const FilePath source = FilePath::fromString(templateDirPath);
const FilePath destination = FilePath::fromString(parentDir.filePath(dirName));
if (!source.copyRecursively(destination)) {
promise.future().cancel();
return;
}
}
}
class tst_SubDirFileIterator : public QObject
{
Q_OBJECT
private slots:
void initTestCase()
{
TemporaryDirectory::setMasterTemporaryDirectory(
QDir::tempPath() + "/" + Core::Constants::IDE_CASED_ID + "-XXXXXX");
const QString libExecPath(qApp->applicationDirPath() + '/'
+ QLatin1String(TEST_RELATIVE_LIBEXEC_PATH));
LauncherInterface::setPathToLauncher(libExecPath);
qDebug() << "This manual test compares the performance of the SubDirFileIterator with "
"a manually written iterator using QDir::entryInfoList().";
QTC_SCOPED_TIMER("GENERATING TEMPORARY FILES TREE");
const int tasksCount = QThread::idealThreadCount();
m_filesCount = expectedFilesCount(tasksCount);
m_dirsCount = expectedDirsCount(tasksCount);
m_tempDir.reset(new QTemporaryDir);
qDebug() << "Generating on" << tasksCount << "cores...";
qDebug() << "Generating" << m_filesCount << "files...";
qDebug() << "Generating" << m_dirsCount << "dirs...";
qDebug() << "Generating inside" << m_tempDir->path() << "dir...";
const QString templateFile = m_tempDir->filePath("fileTemplate.txt");
{
QFile file(templateFile);
QVERIFY(file.open(QIODevice::ReadWrite));
file.write("X");
}
// Parallelize tree generation
const QDir parentDir(m_tempDir->path());
const auto onSetup = [](const QString &parentPath, const QString &templateFile) {
return [parentPath, templateFile](Async<void> &async) {
async.setConcurrentCallData(generate, parentPath, templateFile, s_treeDepth);
};
};
QList<GroupItem> tasks {parallel};
for (int i = 0; i < tasksCount; ++i) {
const QString dirName = QString("%1%2").arg(s_dirPrefix).arg(i);
QVERIFY(parentDir.mkdir(dirName));
tasks.append(AsyncTask<void>(onSetup(parentDir.filePath(dirName), templateFile)));
}
QVERIFY(TaskTree::runBlocking(tasks));
}
void cleanupTestCase()
{
QTC_SCOPED_TIMER("CLEANING UP");
// Parallelize tree removal
const auto removeTree = [](const QString &parentPath) {
FilePath::fromString(parentPath).removeRecursively();
};
const QDir parentDir(m_tempDir->path());
const auto onSetup = [removeTree](const QString &parentPath) {
return [parentPath, removeTree](Async<void> &async) {
async.setConcurrentCallData(removeTree, parentPath);
};
};
QList<GroupItem> tasks {parallel};
const int tasksCount = QThread::idealThreadCount();
for (int i = 0; i < tasksCount; ++i) {
const QString dirName = QString("%1%2").arg(s_dirPrefix).arg(i);
tasks.append(AsyncTask<void>(onSetup(parentDir.filePath(dirName))));
}
QVERIFY(TaskTree::runBlocking(tasks));
m_tempDir.reset();
Singleton::deleteAll();
}
void testSubDirFileIterator()
{
QTC_SCOPED_TIMER("ITERATING with SubDirFileIterator");
int filesCount = 0;
{
const FilePath root(FilePath::fromString(m_tempDir->path()));
SubDirFileIterator it({root}, {}, {});
auto i = it.begin();
const auto e = it.end();
while (i != e) {
++filesCount;
++i;
if (filesCount % 100000 == 0)
qDebug() << filesCount << '/' << m_filesCount << "files visited so far...";
}
}
qDebug() << "Visited" << filesCount << "files.";
}
void testManualIterator()
{
QTC_SCOPED_TIMER("ITERATING with manual iterator");
int filesCount = 0;
int dirsCount = 0;
{
const QDir root(m_tempDir->path());
std::unordered_set<QString> visitedFiles;
std::unordered_set<QString> visitedDirs;
visitedDirs.emplace(root.absolutePath());
QFileInfoList workingList = root.entryInfoList(s_filters);
++dirsCount; // for root itself
while (!workingList.isEmpty()) {
const QFileInfo fi = workingList.takeLast();
const QString absoluteFilePath = fi.absoluteFilePath();
if (fi.isDir()) {
if (!visitedDirs.emplace(absoluteFilePath).second)
continue;
if (fi.isSymbolicLink() && !visitedDirs.emplace(fi.symLinkTarget()).second)
continue;
++dirsCount;
workingList.append(QDir(absoluteFilePath).entryInfoList(s_filters));
} else {
if (!visitedFiles.emplace(absoluteFilePath).second)
continue;
if (fi.isSymbolicLink() && !visitedFiles.emplace(fi.symLinkTarget()).second)
continue;
++filesCount;
if (filesCount % 100000 == 0)
qDebug() << filesCount << '/' << m_filesCount << "files visited so far...";
}
}
}
qDebug() << "Visited" << filesCount << "files and" << dirsCount << "directories.";
}
void testQDirIterator()
{
QTC_SCOPED_TIMER("ITERATING with QDirIterator");
int filesCount = 0;
int dirsCount = 0;
{
++dirsCount; // for root itself
QDirIterator it(m_tempDir->path(), s_filters, QDirIterator::Subdirectories
| QDirIterator::FollowSymlinks);
while (it.hasNext()) {
#if QT_VERSION >= QT_VERSION_CHECK(6, 3, 0)
const QFileInfo fi = it.nextFileInfo();
#else
it.next();
const QFileInfo fi = it.fileInfo();
#endif
if (fi.isDir()) {
++dirsCount;
} else {
++filesCount;
if (filesCount % 100000 == 0)
qDebug() << filesCount << '/' << m_filesCount << "files visited so far...";
}
}
}
qDebug() << "Visited" << filesCount << "files and" << dirsCount << "directories.";
}
private:
int m_dirsCount = 0;
int m_filesCount = 0;
std::unique_ptr<QTemporaryDir> m_tempDir;
};
QTEST_GUILESS_MAIN(tst_SubDirFileIterator)
#include "tst_subdirfileiterator.moc"
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