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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/directory_watcher.h"
#include <CoreServices/CoreServices.h>
#include "base/file_path.h"
#include "base/file_util.h"
#include "base/logging.h"
#include "base/message_loop.h"
#include "base/scoped_cftyperef.h"
namespace {
const CFAbsoluteTime kEventLatencySeconds = 0.3;
class DirectoryWatcherImpl : public DirectoryWatcher::PlatformDelegate {
public:
DirectoryWatcherImpl() {}
~DirectoryWatcherImpl() {
if (!path_.value().empty()) {
FSEventStreamStop(fsevent_stream_);
FSEventStreamInvalidate(fsevent_stream_);
FSEventStreamRelease(fsevent_stream_);
}
}
virtual bool Watch(const FilePath& path, DirectoryWatcher::Delegate* delegate,
MessageLoop* backend_loop, bool recursive);
void OnFSEventsCallback(const FilePath& event_path) {
DCHECK(!path_.value().empty());
if (!recursive_) {
FilePath absolute_event_path = event_path;
if (!file_util::AbsolutePath(&absolute_event_path))
return;
if (absolute_event_path != path_)
return;
}
delegate_->OnDirectoryChanged(path_);
}
private:
// Delegate to notify upon changes.
DirectoryWatcher::Delegate* delegate_;
// Path we're watching (passed to delegate).
FilePath path_;
// Indicates recursive watch.
bool recursive_;
// Backend stream we receive event callbacks from (strong reference).
FSEventStreamRef fsevent_stream_;
DISALLOW_COPY_AND_ASSIGN(DirectoryWatcherImpl);
};
void FSEventsCallback(ConstFSEventStreamRef stream,
void* event_watcher, size_t num_events,
void* event_paths, const FSEventStreamEventFlags flags[],
const FSEventStreamEventId event_ids[]) {
char** paths = reinterpret_cast<char**>(event_paths);
DirectoryWatcherImpl* watcher =
reinterpret_cast<DirectoryWatcherImpl*> (event_watcher);
for (size_t i = 0; i < num_events; i++) {
watcher->OnFSEventsCallback(FilePath(paths[i]));
}
}
bool DirectoryWatcherImpl::Watch(const FilePath& path,
DirectoryWatcher::Delegate* delegate,
MessageLoop* backend_loop,
bool recursive) {
DCHECK(path_.value().empty()); // Can only watch one path.
DCHECK(MessageLoop::current()->type() == MessageLoop::TYPE_UI);
if (!file_util::PathExists(path))
return false;
path_ = path;
if (!file_util::AbsolutePath(&path_)) {
path_ = FilePath(); // Make sure we're marked as not-in-use.
return false;
}
delegate_ = delegate;
recursive_ = recursive;
scoped_cftyperef<CFStringRef> cf_path(CFStringCreateWithCString(
NULL, path.value().c_str(), kCFStringEncodingMacHFS));
CFStringRef path_for_array = cf_path.get();
scoped_cftyperef<CFArrayRef> watched_paths(CFArrayCreate(
NULL, reinterpret_cast<const void**>(&path_for_array), 1,
&kCFTypeArrayCallBacks));
FSEventStreamContext context;
context.version = 0;
context.info = this;
context.retain = NULL;
context.release = NULL;
context.copyDescription = NULL;
fsevent_stream_ = FSEventStreamCreate(NULL, &FSEventsCallback, &context,
watched_paths,
kFSEventStreamEventIdSinceNow,
kEventLatencySeconds,
kFSEventStreamCreateFlagNone);
FSEventStreamScheduleWithRunLoop(fsevent_stream_, CFRunLoopGetCurrent(),
kCFRunLoopDefaultMode);
FSEventStreamStart(fsevent_stream_);
return true;
}
} // namespace
DirectoryWatcher::DirectoryWatcher() {
impl_ = new DirectoryWatcherImpl();
}
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