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// Copyright (c) 2012 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 CONTENT_BROWSER_WEBUI_URL_DATA_MANAGER_H_
#define CONTENT_BROWSER_WEBUI_URL_DATA_MANAGER_H_
#include <string>
#include <vector>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/supports_user_data.h"
#include "content/common/content_export.h"
namespace content {
class BrowserContext;
class URLDataSource;
class URLDataSourceImpl;
class WebUIDataSource;
// To serve dynamic data off of chrome: URLs, implement the
// URLDataManager::DataSource interface and register your handler
// with AddDataSource. DataSources must be added on the UI thread (they are also
// deleted on the UI thread). Internally the DataSources are maintained by
// URLDataManagerBackend, see it for details.
class CONTENT_EXPORT URLDataManager : public base::SupportsUserData::Data {
public:
explicit URLDataManager(BrowserContext* browser_context);
~URLDataManager() override;
// Adds a DataSource to the collection of data sources. This *must* be invoked
// on the UI thread.
//
// If |AddDataSource| is called more than once for a particular name it will
// release the old |DataSource|, most likely resulting in it getting deleted
// as there are no other references to it. |DataSource| uses the
// |DeleteOnUIThread| trait to insure that the destructor is called on the UI
// thread. This is necessary as some |DataSource|s notably |FileIconSource|
// and |FaviconSource|, have members that will DCHECK if they are not
// destructed in the same thread as they are constructed (the UI thread).
void AddDataSource(URLDataSourceImpl* source);
// Deletes any data sources no longer referenced. This is normally invoked
// for you, but can be invoked to force deletion (such as during shutdown).
static void DeleteDataSources();
// Convenience wrapper function to add |source| to |browser_context|'s
// |URLDataManager|. Creates a URLDataSourceImpl to wrap the given
// source.
static void AddDataSource(BrowserContext* browser_context,
URLDataSource* source);
// Adds a WebUI data source to |browser_context|'s |URLDataManager|.
static void AddWebUIDataSource(BrowserContext* browser_context,
WebUIDataSource* source);
private:
friend class URLDataSourceImpl;
friend struct DeleteURLDataSource;
typedef std::vector<const URLDataSourceImpl*> URLDataSources;
// If invoked on the UI thread the DataSource is deleted immediatlye,
// otherwise it is added to |data_sources_| and a task is scheduled to handle
// deletion on the UI thread. See note abouve DeleteDataSource for more info.
static void DeleteDataSource(const URLDataSourceImpl* data_source);
// Returns true if |data_source| is scheduled for deletion (|DeleteDataSource|
// was invoked).
static bool IsScheduledForDeletion(const URLDataSourceImpl* data_source);
BrowserContext* browser_context_;
// |data_sources_| that are no longer referenced and scheduled for deletion.
// Protected by g_delete_lock in the .cc file.
static URLDataSources* data_sources_;
DISALLOW_COPY_AND_ASSIGN(URLDataManager);
};
} // namespace content
#endif // CONTENT_BROWSER_WEBUI_URL_DATA_MANAGER_H_