108 lines
3.6 KiB
C++
108 lines
3.6 KiB
C++
/*
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* Copyright (C) 2017 Igalia S.L.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "FileMonitor.h"
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#include <wtf/FileSystem.h>
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#include <wtf/glib/GUniquePtr.h>
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namespace WebCore {
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FileMonitor::FileMonitor(const String& path, Ref<WorkQueue>&& handlerQueue, WTF::Function<void(FileChangeType)>&& modificationHandler)
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: m_handlerQueue(WTFMove(handlerQueue))
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, m_modificationHandler(WTFMove(modificationHandler))
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{
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if (path.isEmpty() || !m_modificationHandler)
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return;
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Function<void ()> createPlatformMonitor = [&] {
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auto file = adoptGRef(g_file_new_for_path(FileSystem::fileSystemRepresentation(path).data()));
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GUniqueOutPtr<GError> error;
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m_platformMonitor = adoptGRef(g_file_monitor(file.get(), G_FILE_MONITOR_NONE, nullptr, &error.outPtr()));
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if (m_platformMonitor)
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g_signal_connect(m_platformMonitor.get(), "changed", G_CALLBACK(fileChangedCallback), this);
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else
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WTFLogAlways("Failed to create a monitor for path %s: %s", path.utf8().data(), error->message);
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};
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// The monitor can be created in the work queue thread.
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if (&m_handlerQueue->runLoop() == &RunLoop::current()) {
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createPlatformMonitor();
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return;
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}
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m_handlerQueue->dispatchSync([createPlatformMonitor = WTFMove(createPlatformMonitor)] {
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createPlatformMonitor();
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});
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}
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FileMonitor::~FileMonitor()
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{
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// The monitor can be destroyed in the work queue thread.
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if (&m_handlerQueue->runLoop() == &RunLoop::current()) {
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cancel();
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return;
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}
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m_handlerQueue->dispatchSync([this] {
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cancel();
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});
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}
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void FileMonitor::fileChangedCallback(GFileMonitor*, GFile*, GFile*, GFileMonitorEvent event, FileMonitor* monitor)
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{
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switch (event) {
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case G_FILE_MONITOR_EVENT_DELETED:
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monitor->didChange(FileChangeType::Removal);
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break;
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case G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT:
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case G_FILE_MONITOR_EVENT_CREATED:
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monitor->didChange(FileChangeType::Modification);
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break;
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default:
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break;
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}
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}
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void FileMonitor::didChange(FileChangeType type)
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{
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ASSERT(!isMainThread());
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if (type == FileChangeType::Removal)
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cancel();
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m_modificationHandler(type);
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}
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void FileMonitor::cancel()
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{
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if (!m_platformMonitor)
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return;
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g_file_monitor_cancel(m_platformMonitor.get());
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m_platformMonitor = nullptr;
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}
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} // namespace WebCore
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