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/*
Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All
rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
This class provides all functionality needed for loading images, style
sheets and html pages from the web. It has a memory cache for these objects.
*/
#include "third_party/blink/renderer/platform/loader/fetch/resource_client.h"
#include "base/task/single_thread_task_runner.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource.h"
namespace blink {
void ResourceClient::Trace(Visitor* visitor) const {
visitor->Trace(resource_);
}
void ResourceClient::SetResource(Resource* new_resource,
base::SingleThreadTaskRunner* task_runner) {
if (new_resource == resource_)
return;
// Some ResourceClient implementations reenter this so we need to
// prevent double removal.
if (Resource* old_resource = resource_.Release())
old_resource->RemoveClient(this);
resource_ = new_resource;
if (resource_)
resource_->AddClient(this, task_runner);
}
void ResourceClient::Prefinalize() {
// This is conceptually equivalent to ClearResource(), but skips the most of
// Resource::RemoveClient() (particularly Contains() calls) to avoid check
// failures in V8-side. DidRemoveClientOrObserver() is still called here to
// notify resource of client removal. Removing `this` from the `resource_`'s
// clients is done through weak pointers, and thus this shouldn't be called
// other than as prefinalizers.
if (Resource* old_resource = resource_.Release()) {
old_resource->DidRemoveClientOrObserver();
}
resource_ = nullptr;
}
} // namespace blink
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