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// Copyright 2015 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 EXTENSIONS_BROWSER_SERIAL_EXTENSION_HOST_QUEUE_H_
#define EXTENSIONS_BROWSER_SERIAL_EXTENSION_HOST_QUEUE_H_
#include <list>
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "extensions/browser/extension_host_queue.h"
namespace extensions {
class DeferredStartRenderHost;
// An ExtensionHostQueue which initializes DeferredStartRenderHosts in the order
// they're Add()ed, with simple rate limiting logic that re-posts each task to
// the UI thread, to avoid clogging it for a long period of time.
class SerialExtensionHostQueue : public ExtensionHostQueue {
public:
SerialExtensionHostQueue();
~SerialExtensionHostQueue() override;
private:
// ExtensionHostQueue:
void Add(DeferredStartRenderHost* host) override;
void Remove(DeferredStartRenderHost* host) override;
// Queues up a delayed task to process the next DeferredStartRenderHost in
// the queue.
void PostTask();
// Creates the RenderView for the next host in the queue.
void ProcessOneHost();
// True if this queue is currently in the process of starting an
// DeferredStartRenderHost.
bool pending_create_;
// The list of DeferredStartRenderHosts waiting to be started.
std::list<DeferredStartRenderHost*> queue_;
base::WeakPtrFactory<SerialExtensionHostQueue> ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(SerialExtensionHostQueue);
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_SERIAL_EXTENSION_HOST_QUEUE_H_
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