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https://github.com/RGBCube/serenity
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A Resource represents a resource that we're loading, have loaded or will soon load. Basically, it's a downloadable resource that can be shared by multiple clients. A typical usecase is multiple <img> elements with the same src. In a future patch, we will try to make sure that those <img> elements get the same Resource if possible. This will reduce network usage, memory usage, and CPU usage. :^) For now, this first patch simply introduces the mechanism. You get a Resource by calling ResourceLoader::load_resource(). To get notified about changes to a Resource's load status, you inherit from ResourceClient and implement the callbacks you're interested in. This patch turns HTMLImageElement into a ResourceClient.
105 lines
3.5 KiB
C++
105 lines
3.5 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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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 are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/ByteBuffer.h>
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#include <AK/HashMap.h>
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#include <AK/HashTable.h>
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#include <AK/Noncopyable.h>
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#include <AK/RefCounted.h>
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#include <AK/URL.h>
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#include <LibWeb/Forward.h>
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namespace Web {
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class ResourceClient;
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class Resource : public RefCounted<Resource> {
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AK_MAKE_NONCOPYABLE(Resource);
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AK_MAKE_NONMOVABLE(Resource);
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public:
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static NonnullRefPtr<Resource> create(Badge<ResourceLoader>, const URL&);
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~Resource();
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bool is_loaded() const { return m_loaded; }
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bool is_failed() const { return m_failed; }
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const String& error() const { return m_error; }
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bool has_encoded_data() const { return !m_encoded_data.is_null(); }
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const URL& url() const { return m_url; }
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const ByteBuffer& encoded_data() const { return m_encoded_data; }
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void register_client(Badge<ResourceClient>, ResourceClient&);
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void unregister_client(Badge<ResourceClient>, ResourceClient&);
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template<typename Callback>
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void for_each_client(Callback callback)
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{
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// FIXME: This should use some kind of smart pointer to ResourceClient!
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Vector<ResourceClient*, 16> clients_copy;
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clients_copy.ensure_capacity(m_clients.size());
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for (auto* client : m_clients)
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clients_copy.append(client);
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for (auto* client : clients_copy)
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callback(*client);
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}
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void did_load(Badge<ResourceLoader>, const ByteBuffer& data, const HashMap<String, String, CaseInsensitiveStringTraits>& headers);
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void did_fail(Badge<ResourceLoader>, const String& error);
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private:
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explicit Resource(const URL&);
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URL m_url;
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ByteBuffer m_encoded_data;
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bool m_loaded { false };
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bool m_failed { false };
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String m_error;
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HashMap<String, String, CaseInsensitiveStringTraits> m_response_headers;
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HashTable<ResourceClient*> m_clients;
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};
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class ResourceClient {
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public:
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virtual ~ResourceClient();
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virtual void resource_did_load() { }
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virtual void resource_did_fail() { }
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protected:
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Resource* resource() { return m_resource; }
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const Resource* resource() const { return m_resource; }
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void set_resource(Resource*);
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private:
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RefPtr<Resource> m_resource;
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};
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}
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