blob: 0e94ed517e90c2fb80bbd5fa4f85c448b48e97ae [file] [log] [blame]
// Copyright 2018 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.
#include <list>
#include <memory>
#include "base/macros.h"
#include "base/memory/memory_pressure_listener.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "url/gurl.h"
namespace content {
class BrowserContext;
namespace chromecast {
class RendererPrelauncher;
// Factory class for testing.
class RendererPrelauncherFactory {
virtual std::unique_ptr<RendererPrelauncher> Create(
content::BrowserContext* browser_context,
const GURL& page_url) = 0;
virtual ~RendererPrelauncherFactory() = default;
// This class maintains a pool of prelaunched (initialized) renderers.
class LRURendererCache {
LRURendererCache(content::BrowserContext* browser_context,
size_t max_renderers);
virtual ~LRURendererCache();
// Returns a pre-launched renderer. Returns nullptr if a cached renderer isn't
// available (clients should create their own in this case).
std::unique_ptr<RendererPrelauncher> TakeRendererPrelauncher(
const GURL& page_url);
// Indicate that the renderer for |page_url| is no longer in use. If the total
// number of in-use renderers is less than |max_renderers_|, then we will
// immediately pre-load the renderer for |page_url| since it was recently
// used. This operation may evict a prelaunched renderer to keep the total
// pool size below |max_renderers_|
void ReleaseRendererPrelauncher(const GURL& page_url);
friend class LRURendererCacheTest;
void SetFactoryForTesting(RendererPrelauncherFactory* factory);
void StartNextPrelauncher(const GURL& page_url);
void OnMemoryPressure(
base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
// Evict pre-launched renderers so that the total number of in-use and cached
// renderers doesn't exceed |max_renderers_|.
void EvictCache();
content::BrowserContext* const browser_context_;
const size_t max_renderers_;
size_t in_use_count_;
std::list<std::unique_ptr<RendererPrelauncher>> cache_;
std::unique_ptr<base::MemoryPressureListener> memory_pressure_listener_;
RendererPrelauncherFactory* factory_for_testing_ = nullptr;
base::WeakPtrFactory<LRURendererCache> weak_factory_;
} // namespace chromecast