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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_EXTENSION_HOST_QUEUE_H_
#define EXTENSIONS_BROWSER_EXTENSION_HOST_QUEUE_H_
#include <list>
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
namespace extensions {
class DeferredStartRenderHost;
// A queue of ExtensionHosts waiting for initialization. This 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 ExtensionHostQueue {
public:
ExtensionHostQueue();
~ExtensionHostQueue();
ExtensionHostQueue(const ExtensionHostQueue& queue) = delete;
ExtensionHostQueue& operator=(const ExtensionHostQueue& queue) = delete;
// Returns the single global instance of the ExtensionHostQueue.
static ExtensionHostQueue& GetInstance();
// Adds a host to the queue for RenderView creation.
void Add(DeferredStartRenderHost* host);
// Removes a host from the queue (for example, it may be deleted before
// having a chance to start)
void Remove(DeferredStartRenderHost* host);
// Adds a delay before starting the next ExtensionHost. This can be used for
// testing purposes to help flush out flakes.
void SetCustomDelayForTesting(base::TimeDelta delay) { delay_ = delay; }
private:
// 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 delay before starting the next host. By default, this is 0, meaning we
// just wait until the event loop yields.
base::TimeDelta delay_;
// The list of DeferredStartRenderHosts waiting to be started.
std::list<DeferredStartRenderHost*> queue_;
base::WeakPtrFactory<ExtensionHostQueue> ptr_factory_{this};
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_EXTENSION_HOST_QUEUE_H_
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