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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_PREFETCH_COMMON_H_
#define CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_COMMON_H_
#include "base/time/time.h"
#include "url/gurl.h"
class Profile;
namespace content {
class WebContents;
}
namespace predictors {
struct ResourcePrefetchPredictorConfig;
// Returns true if prefetching is enabled. And will initilize the |config|
// fields to the appropritate values.
bool IsSpeculativeResourcePrefetchingEnabled(
Profile* profile,
ResourcePrefetchPredictorConfig* config);
// Represents the type of key based on which prefetch data is stored.
enum PrefetchKeyType {
PREFETCH_KEY_TYPE_HOST,
PREFETCH_KEY_TYPE_URL
};
// Represents a single navigation for a render frame.
struct NavigationID {
// TODO(shishir): Maybe take process_id, frame_id and url as input in
// constructor.
NavigationID();
NavigationID(const NavigationID& other);
explicit NavigationID(content::WebContents* web_contents);
bool operator<(const NavigationID& rhs) const;
bool operator==(const NavigationID& rhs) const;
bool IsSameRenderer(const NavigationID& other) const;
// Returns true iff the render_process_id_, render_frame_id_ and
// frame_url_ has been set correctly.
bool is_valid() const;
int render_process_id;
int render_frame_id;
GURL main_frame_url;
// NOTE: Even though we store the creation time here, it is not used during
// comparison of two NavigationIDs because it cannot always be determined
// correctly.
base::TimeTicks creation_time;
};
// Represents the config for the resource prefetch prediction algorithm. It is
// useful for running experiments.
struct ResourcePrefetchPredictorConfig {
// Initializes the config with default values.
ResourcePrefetchPredictorConfig();
~ResourcePrefetchPredictorConfig();
// The mode the prefetcher is running in. Forms a bit map.
enum Mode {
URL_LEARNING = 1 << 0,
HOST_LEARNING = 1 << 1,
URL_PREFETCHING = 1 << 2, // Should also turn on URL_LEARNING.
HOST_PRFETCHING = 1 << 3 // Should also turn on HOST_LEARNING.
};
int mode;
// Helpers to deal with mode.
bool IsLearningEnabled() const;
bool IsPrefetchingEnabled() const;
bool IsURLLearningEnabled() const;
bool IsHostLearningEnabled() const;
bool IsURLPrefetchingEnabled() const;
bool IsHostPrefetchingEnabled() const;
// If a navigation hasn't seen a load complete event in this much time, it
// is considered abandoned.
size_t max_navigation_lifetime_seconds;
// Size of LRU caches for the URL and host data.
size_t max_urls_to_track;
size_t max_hosts_to_track;
// The number of times we should have seen a visit to this URL in history
// to start tracking it. This is to ensure we don't bother with oneoff
// entries. For hosts we track each one.
size_t min_url_visit_count;
// The maximum number of resources to store per entry.
size_t max_resources_per_entry;
// The number of consecutive misses after we stop tracking a resource URL.
size_t max_consecutive_misses;
// The minimum confidence (accuracy of hits) required for a resource to be
// prefetched.
float min_resource_confidence_to_trigger_prefetch;
// The minimum number of times we must have a URL on record to prefetch it.
size_t min_resource_hits_to_trigger_prefetch;
// Maximum number of prefetches that can be inflight for a single navigation.
size_t max_prefetches_inflight_per_navigation;
// Maximum number of prefetches that can be inflight for a host for a single
// navigation.
size_t max_prefetches_inflight_per_host_per_navigation;
};
} // namespace predictors
#endif // CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_COMMON_H_
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