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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/page_load_metrics/browser/resource_tracker.h"
#include <tuple>
namespace page_load_metrics {
ResourceTracker::ResourceTracker() = default;
ResourceTracker::~ResourceTracker() = default;
void ResourceTracker::UpdateResourceDataUse(
int process_id,
const std::vector<page_load_metrics::mojom::ResourceDataUpdatePtr>&
resources) {
// Clear the map of previous updates to prevent completed resources from
// remaining in the map. This is safe because the map is only expected
// to contain updates for resources that have actively received new data.
previous_resource_updates_.clear();
for (auto const& resource : resources) {
ProcessResourceUpdate(process_id, resource);
}
}
void ResourceTracker::ProcessResourceUpdate(
int process_id,
const page_load_metrics::mojom::ResourceDataUpdatePtr& resource) {
// Do not store resources loaded from the memory cache as we can receive
// duplicate loads of resources across documents.
if (resource->cache_type == page_load_metrics::mojom::CacheType::kMemory)
return;
content::GlobalRequestID global_id(process_id, resource->request_id);
auto it = unfinished_resources_.find(global_id);
// This is the first update received for a resource.
if (it == unfinished_resources_.end()) {
if (!resource->is_complete) {
unfinished_resources_.emplace(std::piecewise_construct,
std::forward_as_tuple(global_id),
std::forward_as_tuple(resource->Clone()));
}
return;
}
// Update the map of previous resource data now that we have a new data update
// for a tracked resource.
previous_resource_updates_[global_id] = it->second->Clone();
// Either update the unfinished resource data or remove it from the map if it
// completed. Must clone resource so it will be accessible when the observer
// is destroyed.
if (resource->is_complete)
unfinished_resources_.erase(it);
else
it->second = resource->Clone();
}
bool ResourceTracker::HasPreviousUpdateForResource(
content::GlobalRequestID request_id) const {
return previous_resource_updates_.count(request_id) != 0;
}
const page_load_metrics::mojom::ResourceDataUpdatePtr&
ResourceTracker::GetPreviousUpdateForResource(
content::GlobalRequestID request_id) const {
DCHECK(HasPreviousUpdateForResource(request_id));
return previous_resource_updates_.find(request_id)->second;
}
} // namespace page_load_metrics
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