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// Copyright 2013 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 COMPONENTS_PRECACHE_CONTENT_PRECACHE_MANAGER_H_
#define COMPONENTS_PRECACHE_CONTENT_PRECACHE_MANAGER_H_
#include <list>
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "components/keyed_service/core/keyed_service.h"
#include "components/precache/core/precache_fetcher.h"
#include "url/gurl.h"
namespace base {
class Time;
}
namespace content {
class BrowserContext;
}
namespace precache {
class PrecacheDatabase;
class URLListProvider;
// Class that manages all precaching-related activities. Owned by the
// BrowserContext that it is constructed for. Use
// PrecacheManagerFactory::GetForBrowserContext to get an instance of this
// class. All methods must be called on the UI thread unless indicated
// otherwise.
// TODO(sclittle): Delete precache history when browsing history is deleted.
// http://crbug.com/326549
class PrecacheManager : public KeyedService,
public PrecacheFetcher::PrecacheDelegate,
public base::SupportsWeakPtr<PrecacheManager> {
public:
typedef base::Closure PrecacheCompletionCallback;
explicit PrecacheManager(content::BrowserContext* browser_context);
~PrecacheManager() override;
// Returns true if precaching is enabled as part of a field trial or by the
// command line flag. This method can be called on any thread.
static bool IsPrecachingEnabled();
// Returns true if precaching is allowed for the browser context.
bool IsPrecachingAllowed();
// Starts precaching resources that the user is predicted to fetch in the
// future. If precaching is already currently in progress, then this method
// does nothing. The |precache_completion_callback| will be run when
// precaching finishes, but will not be run if precaching is canceled.
void StartPrecaching(
const PrecacheCompletionCallback& precache_completion_callback,
URLListProvider* url_list_provider);
// Cancels precaching if it is in progress.
void CancelPrecaching();
// Returns true if precaching is currently in progress, or false otherwise.
bool IsPrecaching() const;
// Update precache-related metrics in response to a URL being fetched.
void RecordStatsForFetch(const GURL& url,
const base::Time& fetch_time,
int64 size,
bool was_cached);
private:
// From KeyedService.
void Shutdown() override;
// From PrecacheFetcher::PrecacheDelegate.
void OnDone() override;
void OnURLsReceived(const std::list<GURL>& urls);
// The browser context that owns this PrecacheManager.
content::BrowserContext* browser_context_;
// The PrecacheFetcher used to precache resources. Should only be used on the
// UI thread.
scoped_ptr<PrecacheFetcher> precache_fetcher_;
// The callback that will be run if precaching finishes without being
// canceled.
PrecacheCompletionCallback precache_completion_callback_;
// The PrecacheDatabase for tracking precache metrics. Should only be used on
// the DB thread.
scoped_refptr<PrecacheDatabase> precache_database_;
// Flag indicating whether or not precaching is currently in progress.
bool is_precaching_;
DISALLOW_COPY_AND_ASSIGN(PrecacheManager);
};
} // namespace precache
#endif // COMPONENTS_PRECACHE_CONTENT_PRECACHE_MANAGER_H_
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