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// Copyright 2016 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 THIRD_PARTY_BLINK_RENDERER_CORE_WORKERS_THREADED_MESSAGING_PROXY_BASE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_WORKERS_THREADED_MESSAGING_PROXY_BASE_H_
#include "base/optional.h"
#include "third_party/blink/public/mojom/devtools/console_message.mojom-blink-forward.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/frame/web_feature_forward.h"
#include "third_party/blink/renderer/core/workers/parent_execution_context_task_runners.h"
#include "third_party/blink/renderer/core/workers/worker_backing_thread_startup_data.h"
#include "third_party/blink/renderer/core/workers/worker_thread.h"
#include "third_party/blink/renderer/platform/heap/self_keep_alive.h"
#include "third_party/blink/renderer/platform/scheduler/public/frame_or_worker_scheduler.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
namespace base {
class WaitableEvent;
} // namespace base
namespace blink {
class ExecutionContext;
class SourceLocation;
struct GlobalScopeCreationParams;
// The base proxy class to talk to Worker/WorkletGlobalScope on a worker thread
// from the parent context thread (Note that this is always the main thread for
// now because nested worker is not supported yet). This must be created,
// accessed and destroyed on the parent context thread.
//
// This has a unique lifetime: this is co-owned by the parent object (e.g.,
// DedicatedWorker, AnimationWorklet) and by itself via SelfKeepAlive. The
// parent object releases the reference on its destructor and SelfKeepAlive is
// cleared when the worker thread is terminated.
//
// This co-ownership is necessary because the proxy needs to outlive components
// living on the worker thread (e.g., WorkerGlobalScope) but the parent object
// can be destroyed before the completion of worker thread termination.
class CORE_EXPORT ThreadedMessagingProxyBase
: public GarbageCollected<ThreadedMessagingProxyBase> {
public:
virtual ~ThreadedMessagingProxyBase();
void TerminateGlobalScope();
// This method should be called in the destructor of the object which
// initially created it. This object could either be a Worker or a Worklet.
// This may cause deletion of this via |keep_alive_|.
void ParentObjectDestroyed();
void CountFeature(WebFeature);
void CountDeprecation(WebFeature);
void ReportConsoleMessage(mojom::ConsoleMessageSource,
mojom::ConsoleMessageLevel,
const String& message,
std::unique_ptr<SourceLocation>);
void WorkerThreadTerminated();
// Number of live messaging proxies, used by leak detection.
static int ProxyCount();
virtual void Trace(Visitor*);
protected:
explicit ThreadedMessagingProxyBase(ExecutionContext*);
void InitializeWorkerThread(
std::unique_ptr<GlobalScopeCreationParams>,
const base::Optional<WorkerBackingThreadStartupData>&);
ExecutionContext* GetExecutionContext() const;
ParentExecutionContextTaskRunners* GetParentExecutionContextTaskRunners()
const;
// May return nullptr after termination is requested.
WorkerThread* GetWorkerThread() const;
bool AskedToTerminate() const { return asked_to_terminate_; }
// Returns true if this is called on the parent context thread.
bool IsParentContextThread() const;
private:
virtual std::unique_ptr<WorkerThread> CreateWorkerThread() = 0;
Member<ExecutionContext> execution_context_;
// Accessed cross-thread when worker thread posts tasks to the parent.
CrossThreadPersistent<ParentExecutionContextTaskRunners>
parent_execution_context_task_runners_;
std::unique_ptr<WorkerThread> worker_thread_;
bool asked_to_terminate_ = false;
// Used to terminate the synchronous resource loading (XMLHttpRequest) on the
// worker thread from the main thread.
base::WaitableEvent terminate_sync_load_event_;
FrameOrWorkerScheduler::SchedulingAffectingFeatureHandle
feature_handle_for_scheduler_;
// Used to keep this alive until the worker thread gets terminated. This is
// necessary because the co-owner (i.e., Worker or Worklet object) can be
// destroyed before thread termination.
SelfKeepAlive<ThreadedMessagingProxyBase> keep_alive_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_WORKERS_THREADED_MESSAGING_PROXY_BASE_H_
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