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/*
* SPDX-FileCopyrightText: 2011 Peter Penz <[email protected]>
* SPDX-FileCopyrightText: 2013 Frank Reininghaus <[email protected]>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "kdirectorycontentscounter.h"
#include "kitemviews/kfileitemmodel.h"
#include <KDirWatch>
#include <QDir>
#include <QFileInfo>
#include <QThread>
namespace
{
/// cache of directory counting result
static QHash<QString, QPair<int, long>> *s_cache;
}
KDirectoryContentsCounter::KDirectoryContentsCounter(KFileItemModel *model, QObject *parent)
: QObject(parent)
, m_model(model)
, m_queue()
, m_worker(nullptr)
, m_workerIsBusy(false)
, m_dirWatcher(nullptr)
, m_watchedDirs()
{
connect(m_model, &KFileItemModel::itemsRemoved, this, &KDirectoryContentsCounter::slotItemsRemoved);
if (!m_workerThread) {
m_workerThread = new QThread();
m_workerThread->start();
}
if (s_cache == nullptr) {
s_cache = new QHash<QString, QPair<int, long>>();
}
m_worker = new KDirectoryContentsCounterWorker();
m_worker->moveToThread(m_workerThread);
connect(this, &KDirectoryContentsCounter::requestDirectoryContentsCount, m_worker, &KDirectoryContentsCounterWorker::countDirectoryContents);
connect(m_worker, &KDirectoryContentsCounterWorker::result, this, &KDirectoryContentsCounter::slotResult);
m_dirWatcher = new KDirWatch(this);
connect(m_dirWatcher, &KDirWatch::dirty, this, &KDirectoryContentsCounter::slotDirWatchDirty);
}
KDirectoryContentsCounter::~KDirectoryContentsCounter()
{
if (m_workerThread->isRunning()) {
// The worker thread will continue running. It could even be running
// a method of m_worker at the moment, so we delete it using
// deleteLater() to prevent a crash.
m_worker->deleteLater();
} else {
// There are no remaining workers -> stop the worker thread.
m_workerThread->quit();
m_workerThread->wait();
delete m_workerThread;
m_workerThread = nullptr;
// The worker thread has finished running now, so it's safe to delete
// m_worker. deleteLater() would not work at all because the event loop
// which would deliver the event to m_worker is not running any more.
delete m_worker;
}
}
void KDirectoryContentsCounter::scanDirectory(const QString &path)
{
startWorker(path);
}
void KDirectoryContentsCounter::slotResult(const QString &path, int count, long size)
{
m_workerIsBusy = false;
const QFileInfo info = QFileInfo(path);
const QString resolvedPath = info.canonicalFilePath();
if (!m_dirWatcher->contains(resolvedPath)) {
m_dirWatcher->addDir(resolvedPath);
m_watchedDirs.insert(resolvedPath);
}
if (!m_priorityQueue.empty()) {
const QString firstPath = m_priorityQueue.front();
m_priorityQueue.pop_front();
startWorker(firstPath);
} else if (!m_queue.empty()) {
const QString firstPath = m_queue.front();
m_queue.pop_front();
startWorker(firstPath);
}
if (s_cache->contains(resolvedPath)) {
const auto pair = s_cache->value(resolvedPath);
if (pair.first == count && pair.second == size) {
// no change no need to send another result event
return;
}
}
if (info.dir().path() == m_model->rootItem().url().path()) {
// update cache or overwrite value
// when path is a direct children of the current model root
s_cache->insert(resolvedPath, QPair<int, long>(count, size));
}
// sends the results
Q_EMIT result(path, count, size);
}
void KDirectoryContentsCounter::slotDirWatchDirty(const QString &path)
{
const int index = m_model->index(QUrl::fromLocalFile(path));
if (index >= 0) {
if (!m_model->fileItem(index).isDir()) {
// If INotify is used, KDirWatch issues the dirty() signal
// also for changed files inside the directory, even if we
// don't enable this behavior explicitly (see bug 309740).
return;
}
startWorker(path);
}
}
void KDirectoryContentsCounter::slotItemsRemoved()
{
const bool allItemsRemoved = (m_model->count() == 0);
if (!m_watchedDirs.isEmpty()) {
// Don't let KDirWatch watch for removed items
if (allItemsRemoved) {
for (const QString &path : qAsConst(m_watchedDirs)) {
m_dirWatcher->removeDir(path);
}
m_watchedDirs.clear();
m_queue.clear();
} else {
QMutableSetIterator<QString> it(m_watchedDirs);
while (it.hasNext()) {
const QString &path = it.next();
if (m_model->index(QUrl::fromLocalFile(path)) < 0) {
m_dirWatcher->removeDir(path);
it.remove();
}
}
}
}
}
void KDirectoryContentsCounter::startWorker(const QString &path)
{
const QString resolvedPath = QFileInfo(path).canonicalFilePath();
const bool alreadyInCache = s_cache->contains(resolvedPath);
if (alreadyInCache) {
// fast path when in cache
// will be updated later if result has changed
const auto pair = s_cache->value(resolvedPath);
Q_EMIT result(path, pair.first, pair.second);
}
if (m_workerIsBusy) {
if (std::find(m_queue.begin(), m_queue.end(), path) == m_queue.end()
&& std::find(m_priorityQueue.begin(), m_priorityQueue.end(), path) == m_priorityQueue.end()) {
if (alreadyInCache) {
m_queue.push_back(path);
} else {
// append to priority queue
m_priorityQueue.push_back(path);
}
}
} else {
KDirectoryContentsCounterWorker::Options options;
if (m_model->showHiddenFiles()) {
options |= KDirectoryContentsCounterWorker::CountHiddenFiles;
}
if (m_model->showDirectoriesOnly()) {
options |= KDirectoryContentsCounterWorker::CountDirectoriesOnly;
}
Q_EMIT requestDirectoryContentsCount(path, options);
m_workerIsBusy = true;
}
}
QThread *KDirectoryContentsCounter::m_workerThread = nullptr;
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