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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This is the browser side of the cache manager, handling required clearing of
// the renderer-side cache.
#ifndef COMPONENTS_WEB_CACHE_BROWSER_WEB_CACHE_MANAGER_H_
#define COMPONENTS_WEB_CACHE_BROWSER_WEB_CACHE_MANAGER_H_
#include <stddef.h>
#include <map>
#include "base/gtest_prod_util.h"
#include "base/memory/weak_ptr.h"
#include "base/no_destructor.h"
#include "base/scoped_multi_source_observation.h"
#include "components/web_cache/public/mojom/web_cache.mojom.h"
#include "content/public/browser/child_process_id.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/render_process_host_creation_observer.h"
#include "content/public/browser/render_process_host_observer.h"
#include "mojo/public/cpp/bindings/remote.h"
namespace web_cache {
// Note: memory usage uses uint64_t because potentially the browser could be
// 32 bit and the renderers 64 bits.
class WebCacheManager : public content::RenderProcessHostCreationObserver,
public content::RenderProcessHostObserver {
public:
// Gets the singleton WebCacheManager object. The first time this method
// is called, a WebCacheManager object is constructed and returned.
// Subsequent calls will return the same object.
static WebCacheManager* GetInstance();
WebCacheManager(const WebCacheManager&) = delete;
WebCacheManager& operator=(const WebCacheManager&) = delete;
// Clears all in-memory caches.
void ClearCache();
// Instantly clears renderer cache for a process.
// Must be called between Add(process_id) and Remove(process_id).
void ClearCacheForProcess(content::ChildProcessId process_id);
// Clears all in-memory caches when a tab is reloaded or the user navigates
// to a different website.
void ClearCacheOnNavigation();
// content::RenderProcessHostCreationObserver:
void OnRenderProcessHostCreated(
content::RenderProcessHost* process_host) override;
// content::RenderProcessHostObserver:
void RenderProcessReady(content::RenderProcessHost* process_host) override;
void RenderProcessExited(
content::RenderProcessHost* process_host,
const content::ChildProcessTerminationInfo& info) override;
void RenderProcessHostDestroyed(
content::RenderProcessHost* process_host) override;
private:
friend class base::NoDestructor<WebCacheManager>;
FRIEND_TEST_ALL_PREFIXES(WebCacheManagerTest, AddRemoveRendererTest);
FRIEND_TEST_ALL_PREFIXES(WebCacheManagerTest, OnlyClearCacheWhenProcessReady);
FRIEND_TEST_ALL_PREFIXES(WebCacheManagerTest, PreExistingRenderProcessHost);
// This class is a singleton. Do not instantiate directly. Call GetInstance()
// instead.
WebCacheManager();
~WebCacheManager() override;
// When a render process is created, it registers itself with the cache
// manager host. The renderer will populate its cache, which may need to get
// cleared later.
void Add(content::RenderProcessHost* process_host);
// Unregister the renderer when it gets destroyed.
void Remove(content::RenderProcessHost* process_host);
enum ClearCacheOccasion {
// Instructs to clear the cache instantly.
INSTANTLY,
// Instructs to clear the cache when a navigation takes place (this
// includes reloading a tab).
ON_NAVIGATION
};
// Inform all renderers to clear their cache.
void ClearRendererCache(ClearCacheOccasion occasion);
// Maps every renderer_id with its corresponding
// mojo::Remote<mojom::WebCache>. The key is the unique id of every render
// process host.
std::map<content::ChildProcessId, mojo::Remote<mojom::WebCache>>
web_cache_services_;
base::ScopedMultiSourceObservation<content::RenderProcessHost,
content::RenderProcessHostObserver>
rph_observations_{this};
base::WeakPtrFactory<WebCacheManager> weak_factory_{this};
};
} // namespace web_cache
#endif // COMPONENTS_WEB_CACHE_BROWSER_WEB_CACHE_MANAGER_H_
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