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// Copyright 2014 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.
#ifndef CHROME_BROWSER_EXTENSIONS_API_FILE_SYSTEM_ENTRY_WATCHER_SERVICE_H_
#define CHROME_BROWSER_EXTENSIONS_API_FILE_SYSTEM_ENTRY_WATCHER_SERVICE_H_
#include <map>
#include <string>
#include <vector>
#include "base/memory/singleton.h"
#include "base/memory/weak_ptr.h"
#include "base/scoped_observer.h"
#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
#include "components/keyed_service/core/keyed_service.h"
#include "storage/browser/fileapi/file_system_url.h"
#include "storage/browser/fileapi/watcher_manager.h"
namespace content {
class BrowserContext;
} // namespace content
namespace storage {
class FileSystemContext;
} // namespace storage
namespace extensions {
struct Event;
class EventRouter;
// Watches entries (files and directories) for changes. Created per profile.
// TODO(mtomasz): Add support for watching files.
class EntryWatcherService : public KeyedService,
public storage::WatcherManager::Observer {
public:
typedef base::Callback<
void(const std::string& extension_id, scoped_ptr<Event> event)>
DispatchEventImplCallback;
typedef base::Callback<storage::FileSystemContext*(
const std::string& extension_id,
content::BrowserContext* context)> GetFileSystemContextImplCallback;
explicit EntryWatcherService(content::BrowserContext* context);
virtual ~EntryWatcherService();
// Watches a directory. Only one watcher can be set per the same |url| and
// |extension_id|.
void WatchDirectory(const std::string& extension_id,
const storage::FileSystemURL& url,
bool recursive,
const storage::WatcherManager::StatusCallback& callback);
// Unwatches an entry (file or directory).
void UnwatchEntry(const std::string& extension_id,
const storage::FileSystemURL& url,
const storage::WatcherManager::StatusCallback& callback);
std::vector<storage::FileSystemURL> GetWatchedEntries(
const std::string& extension_id);
// storage::WatcherManager::Observer overrides.
virtual void OnEntryChanged(const storage::FileSystemURL& url) override;
virtual void OnEntryRemoved(const storage::FileSystemURL& url) override;
// Sets a custom dispatcher for tests in order to be able to verify dispatched
// events.
void SetDispatchEventImplForTesting(
const DispatchEventImplCallback& callback);
// Sets a custom context getter for tests in order to inject a testing
// file system context implementation.
void SetGetFileSystemContextImplForTesting(
const GetFileSystemContextImplCallback& callback);
private:
// Holds information about an active entry watcher.
struct EntryWatcher {
EntryWatcher();
EntryWatcher(const storage::FileSystemURL& url,
bool directory,
bool recursive);
~EntryWatcher();
storage::FileSystemURL url;
bool directory;
bool recursive;
};
// Map from a file system url to a map from an extension id to an entry
// watcher descriptor.
typedef std::map<storage::FileSystemURL,
std::map<std::string, EntryWatcher>,
storage::FileSystemURL::Comparator> WatcherMap;
// Called when adding a directory watcher is completed with either a success
// or an error.
void OnWatchDirectoryCompleted(
storage::WatcherManager* watcher_manager,
const std::string& extension_id,
const storage::FileSystemURL& url,
bool recursive,
const storage::WatcherManager::StatusCallback& callback,
base::File::Error result);
// Called when removing a watcher is completed with either a success or an
// error.
void OnUnwatchEntryCompleted(
const std::string& extension_id,
const storage::FileSystemURL& url,
const storage::WatcherManager::StatusCallback& callback,
base::File::Error result);
content::BrowserContext* context_;
WatcherMap watchers_;
DispatchEventImplCallback dispatch_event_impl_;
GetFileSystemContextImplCallback get_file_system_context_impl_;
ScopedObserver<storage::WatcherManager, storage::WatcherManager::Observer>
observing_;
base::WeakPtrFactory<EntryWatcherService> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(EntryWatcherService);
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_API_FILE_SYSTEM_ENTRY_WATCHER_SERVICE_H_
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