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// Copyright 2016 Google Inc. All Rights Reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include <set>
#include "base/threading/thread.h"
#include "cobalt/csp/content_security_policy.h"
#include "cobalt/loader/fetcher_factory.h"
#include "cobalt/loader/font/typeface_decoder.h"
#include "cobalt/loader/image/image_decoder.h"
#include "cobalt/loader/loader.h"
#include "cobalt/loader/mesh/mesh_decoder.h"
#include "cobalt/render_tree/resource_provider.h"
#include "googleurl/src/gurl.h"
namespace cobalt {
namespace loader {
// The LoaderFactory provides a central loader creator object from which clients
// can request the creation of loaders of various types. The LoaderFactory
// maintains all context necessary to create the various resource types.
class LoaderFactory {
LoaderFactory(FetcherFactory* fetcher_factory,
render_tree::ResourceProvider* resource_provider,
base::ThreadPriority loader_thread_priority);
// Creates a loader that fetches and decodes an image.
scoped_ptr<Loader> CreateImageLoader(
const GURL& url, const csp::SecurityCallback& url_security_callback,
const image::ImageDecoder::SuccessCallback& success_callback,
const image::ImageDecoder::ErrorCallback& error_callback,
const Origin& origin);
// Creates a loader that fetches and decodes a render_tree::Typeface.
scoped_ptr<Loader> CreateTypefaceLoader(
const GURL& url, const csp::SecurityCallback& url_security_callback,
const font::TypefaceDecoder::SuccessCallback& success_callback,
const font::TypefaceDecoder::ErrorCallback& error_callback,
const Origin& orgin);
// Creates a loader that fetches and decodes a Mesh.
scoped_ptr<Loader> CreateMeshLoader(
const GURL& url, const csp::SecurityCallback& url_security_callback,
const mesh::MeshDecoder::SuccessCallback& success_callback,
const mesh::MeshDecoder::ErrorCallback& error_callback,
const Origin& origin);
// Clears out the loader factory's resource provider, aborting any in-progress
// loads.
void Suspend();
// Resets a new resource provider for this loader factory to use. The
// previous resource provider must have been cleared before this method is
// called.
void Resume(render_tree::ResourceProvider* resource_provider);
void OnLoaderCreated(Loader* loader);
void OnLoaderDestroyed(Loader* loader);
Loader::FetcherCreator MakeFetcherCreator(
const GURL& url, const csp::SecurityCallback& url_security_callback,
RequestMode request_mode, const Origin& origin);
// Ensures that the LoaderFactory methods are only called from the same
// thread.
base::ThreadChecker thread_checker_;
// Used to create the Fetcher component of the loaders.
FetcherFactory* fetcher_factory_;
// Used to create render_tree resources.
render_tree::ResourceProvider* resource_provider_;
// Keeps track of all active loaders so that if a suspend event occurs they
// can be aborted.
typedef std::set<Loader*> LoaderSet;
LoaderSet active_loaders_;
// Thread to run asynchronous fetchers and decoders on. At the moment,
// image decoding is the only thing done on this thread.
base::Thread load_thread_;
// Whether or not the LoaderFactory is currently suspended. While it is, all
// loaders created by it begin in a suspended state.
bool is_suspended_;
} // namespace loader
} // namespace cobalt