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// Copyright 2014 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 CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCHER_MANAGER_H_
#define CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCHER_MANAGER_H_
#include <map>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "chrome/browser/predictors/resource_prefetch_common.h"
#include "chrome/browser/predictors/resource_prefetcher.h"
namespace net {
class URLRequestContextGetter;
}
namespace predictors {
struct NavigationID;
class ResourcePrefetchPredictor;
// Manages prefetches for multple navigations.
// - Created and owned by the resource prefetch predictor.
// - Needs to be refcounted as it is de-referenced on two different threads.
// - Created on the UI thread, but most functions are called in the IO thread.
// - Will only allow one inflight prefresh per main frame URL.
class ResourcePrefetcherManager
: public ResourcePrefetcher::Delegate,
public base::RefCountedThreadSafe<ResourcePrefetcherManager> {
public:
// The |predictor| should be alive till ShutdownOnIOThread is called.
ResourcePrefetcherManager(ResourcePrefetchPredictor* predictor,
const ResourcePrefetchPredictorConfig& config,
net::URLRequestContextGetter* getter);
// UI thread.
void ShutdownOnUIThread();
// --- IO Thread methods.
// The prefetchers need to be deleted on the IO thread.
void ShutdownOnIOThread();
// Will create a new ResourcePrefetcher for the main frame url of the input
// navigation if there isn't one already for the same URL or host (for host
// based).
void MaybeAddPrefetch(const NavigationID& navigation_id,
PrefetchKeyType key_type,
scoped_ptr<ResourcePrefetcher::RequestVector> requests);
// Stops the ResourcePrefetcher for the input navigation, if one was in
// progress.
void MaybeRemovePrefetch(const NavigationID& navigation_id);
// ResourcePrefetcher::Delegate methods.
void ResourcePrefetcherFinished(
ResourcePrefetcher* prefetcher,
ResourcePrefetcher::RequestVector* requests) override;
net::URLRequestContext* GetURLRequestContext() override;
private:
friend class base::RefCountedThreadSafe<ResourcePrefetcherManager>;
friend class MockResourcePrefetcherManager;
typedef std::map<std::string, ResourcePrefetcher*> PrefetcherMap;
~ResourcePrefetcherManager() override;
// UI Thread. |predictor_| needs to be called on the UI thread.
void ResourcePrefetcherFinishedOnUI(
const NavigationID& navigation_id,
PrefetchKeyType key_type,
scoped_ptr<ResourcePrefetcher::RequestVector> requests);
ResourcePrefetchPredictor* predictor_;
const ResourcePrefetchPredictorConfig config_;
net::URLRequestContextGetter* const context_getter_;
PrefetcherMap prefetcher_map_; // Owns the ResourcePrefetcher pointers.
DISALLOW_COPY_AND_ASSIGN(ResourcePrefetcherManager);
};
} // namespace predictors
#endif // CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCHER_MANAGER_H_
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