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content / browser / renderer_host / render_widget_helper.h [blame]
// Copyright 2012 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_RENDERER_HOST_RENDER_WIDGET_HELPER_H_
#define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HELPER_H_
#include <stdint.h>
#include <map>
#include "base/atomic_sequence_num.h"
#include "base/memory/ref_counted.h"
#include "base/process/process.h"
#include "base/synchronization/lock.h"
#include "base/thread_annotations.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/global_request_id.h"
#include "content/public/common/widget_type.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "third_party/blink/public/common/tokens/tokens.h"
#include "ui/gfx/native_widget_types.h"
namespace content {
// Instantiated per RenderProcessHost to provide various optimizations on
// behalf of a RenderWidgetHost. This class bridges between the IO thread
// where the RenderProcessHost's MessageFilter lives and the UI thread where
// the RenderWidgetHost lives.
class RenderWidgetHelper
: public base::RefCountedThreadSafe<RenderWidgetHelper,
BrowserThread::DeleteOnIOThread> {
public:
RenderWidgetHelper();
RenderWidgetHelper(const RenderWidgetHelper&) = delete;
RenderWidgetHelper& operator=(const RenderWidgetHelper&) = delete;
void Init(int render_process_id);
// Gets the next available routing id. This is thread safe.
int GetNextRoutingID();
// Retrieve a previously stored data. Returns true if the tokens
// were found.
bool TakeStoredDataForFrameToken(const blink::LocalFrameToken& frame_token,
int32_t& routing_id,
base::UnguessableToken& devtools_frame_token,
blink::DocumentToken& document_token);
// Store a set of frame tokens given a routing id. This is usually called on
// the IO thread, and |GetFrameTokensForFrameRoutingID| will be called on the
// UI thread at a later point.
void StoreNextFrameRoutingID(
int32_t routing_id,
const blink::LocalFrameToken& frame_token,
const base::UnguessableToken& devtools_frame_token,
const blink::DocumentToken& document_token);
// IO THREAD ONLY -----------------------------------------------------------
private:
friend class base::RefCountedThreadSafe<RenderWidgetHelper>;
friend struct BrowserThread::DeleteOnThread<BrowserThread::IO>;
friend class base::DeleteHelper<RenderWidgetHelper>;
~RenderWidgetHelper();
int render_process_id_;
struct FrameTokens {
FrameTokens(int32_t routing_id,
const base::UnguessableToken& devtools_frame_token,
const blink::DocumentToken& document_token);
FrameTokens(const FrameTokens& other);
FrameTokens& operator=(const FrameTokens& other);
~FrameTokens();
int32_t routing_id;
base::UnguessableToken devtools_frame_token;
blink::DocumentToken document_token;
};
// Lock that is used to provide access to `frame_storage_map_`
// from the IO and UI threads.
base::Lock frame_token_map_lock_;
// Map that stores handed out routing IDs and frame tokens. Items
// will be removed from this table in TakeStoredDataForFrameToken.
// Locked by |lock_|
std::map<blink::LocalFrameToken, FrameTokens> frame_storage_map_
GUARDED_BY(frame_token_map_lock_);
// The next routing id to use.
base::AtomicSequenceNumber next_routing_id_;
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HELPER_H_