1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ui/webui/top_chrome/profile_preload_candidate_selector.h"
#include <vector>
#include "base/feature_list.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ui/ui_features.h"
#include "chrome/browser/ui/webui/top_chrome/per_profile_webui_tracker.h"
#include "chrome/browser/ui/webui/top_chrome/top_chrome_webui_config.h"
#include "components/site_engagement/content/site_engagement_service.h"
#include "url/gurl.h"
using site_engagement::SiteEngagementService;
namespace webui {
ProfilePreloadCandidateSelector::ProfilePreloadCandidateSelector(
PerProfileWebUITracker* webui_tracker)
: webui_tracker_(webui_tracker) {
no_preload_if_most_engaged_url_is_background_ = base::FeatureList::IsEnabled(
features::kPreloadTopChromeWebUILessNavigations);
}
ProfilePreloadCandidateSelector::~ProfilePreloadCandidateSelector() = default;
void ProfilePreloadCandidateSelector::Init(
const std::vector<GURL>& preloadable_urls) {
preloadable_urls_ = preloadable_urls;
}
std::optional<GURL> ProfilePreloadCandidateSelector::GetURLToPreload(
const PreloadContext& context) const {
if (preloadable_urls_.empty()) {
return std::nullopt;
}
// Sanity check that the context is a Profile.
CHECK(context.IsProfile());
Profile* profile = const_cast<Profile*>(context.GetProfile());
SiteEngagementService* engagement_service =
SiteEngagementService::Get(profile);
// Sort the URLs by engagement score in descending order. This is O(nlogn)
// complexity which is good enough under the assumption that the number of
// preloadable Top Chrome WebUIs is small. We might revisit the algorithm when
// necessary.
std::vector<GURL> sorted_urls = preloadable_urls_;
std::sort(sorted_urls.begin(), sorted_urls.end(),
[&](const GURL& a, const GURL& b) {
return engagement_service->GetScore(a) >
engagement_service->GetScore(b);
});
// Iterate over all preloable URLs to find the URL with the highest
// engagement score and is not present under the profile.
for (const GURL& url : sorted_urls) {
// Skip if this URL is disabled. This is seen in History Clusters side panel
// where some locales are not supported.
auto* config = TopChromeWebUIConfig::From(profile, url);
if (!config || !config->IsWebUIEnabled(profile)) {
continue;
}
// Skip URLs that have low engagement score. Because the URLs are sorted by
// engagement score, we can stop iterating once we find a URL with low
// engagement score.
blink::mojom::EngagementLevel engagement_level =
engagement_service->GetEngagementLevel(url);
if (engagement_level == blink::mojom::EngagementLevel::NONE ||
engagement_level == blink::mojom::EngagementLevel::MINIMAL) {
return std::nullopt;
}
if (IsUrlExcludedByFlag(url)) {
continue;
}
// If the URL is in the background, don't preload at all.
if (no_preload_if_most_engaged_url_is_background_ &&
webui_tracker_->ProfileHasBackgroundWebUI(profile, url.spec())) {
return std::nullopt;
}
// Skip URLs that are already present under the profile.
if (webui_tracker_->ProfileHasWebUI(profile, url.spec())) {
continue;
}
// We have found a candidate URL with the highest engagement score.
return url;
}
return std::nullopt;
}
} // namespace webui
|
