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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_PRELOADING_PRERENDER_PRERENDER_COMMIT_DEFERRING_CONDITION_H_
#define CONTENT_BROWSER_PRELOADING_PRERENDER_PRERENDER_COMMIT_DEFERRING_CONDITION_H_
#include <memory>
#include "base/time/time.h"
#include "content/public/browser/commit_deferring_condition.h"
#include "content/public/browser/web_contents_observer.h"
namespace content {
class NavigationRequest;
// PrerenderCommitDeferringCondition defers a prerender activation with ongoing
// main frame navigation in prerender frame tree. When this happens we wait for
// the ongoing main frame navigation to commit before resuming the prerender
// activation.
//
// This implementation assumes that there are no new navigations happening in
// the main frame during prerender activation i.e., between the ongoing
// navigation commit until the prerender activates.
class PrerenderCommitDeferringCondition : public CommitDeferringCondition,
public WebContentsObserver {
public:
~PrerenderCommitDeferringCondition() override;
static std::unique_ptr<CommitDeferringCondition> MaybeCreate(
NavigationRequest& navigation_request,
NavigationType navigation_type,
std::optional<FrameTreeNodeId> candidate_prerender_frame_tree_node_id);
Result WillCommitNavigation(base::OnceClosure resume) override;
const char* TraceEventName() const override;
private:
PrerenderCommitDeferringCondition(
NavigationRequest& navigation_request,
FrameTreeNodeId candidate_prerender_frame_tree_node_id);
// WebContentsObserver
// Tracks the ongoing navigation commit in prerender frame tree to resume the
// activation.
void DidFinishNavigation(NavigationHandle* handle) override;
// The root frame tree node id of the prerendered page that this navigation
// will attempt to activate. See comments on
// `CommitDeferringConditionRunner::candidate_prerender_frame_tree_node_id_`
// for details.
const FrameTreeNodeId candidate_prerender_frame_tree_node_id_;
// The time PrerenderCommitDeferringCondition started deferring the
// navigation.
base::TimeTicks defer_start_time_;
base::OnceClosure done_closure_;
};
} // namespace content
#endif // CONTENT_BROWSER_PRELOADING_PRERENDER_PRERENDER_COMMIT_DEFERRING_CONDITION_H_
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