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// Copyright 2017 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_MODULES_LOCKS_LOCK_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_LOCKS_LOCK_H_
#include "third_party/blink/public/platform/modules/locks/lock_manager.mojom-blink.h"
#include "third_party/blink/renderer/core/dom/pausable_object.h"
#include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
class LockManager;
class ScriptPromise;
class ScriptPromiseResolver;
class ScriptState;
class Lock final : public ScriptWrappable, public PausableObject {
DEFINE_WRAPPERTYPEINFO();
USING_GARBAGE_COLLECTED_MIXIN(Lock);
public:
static Lock* Create(ScriptState*,
const String& name,
mojom::blink::LockMode,
mojom::blink::LockHandlePtr,
LockManager*);
~Lock() override;
void Trace(blink::Visitor*) override;
EAGERLY_FINALIZE();
// Lock.idl
String name() const { return name_; }
String mode() const;
// PausableObject
void ContextDestroyed(ExecutionContext*) override;
// The lock is held until the passed promise resolves. When it is released,
// the passed resolver is invoked with the promise's result.
void HoldUntil(ScriptPromise, ScriptPromiseResolver*);
static mojom::blink::LockMode StringToMode(const String&);
static String ModeToString(mojom::blink::LockMode);
private:
class ThenFunction;
Lock(ScriptState*,
const String& name,
mojom::blink::LockMode,
mojom::blink::LockHandlePtr,
LockManager*);
void ReleaseIfHeld();
void OnConnectionError();
Member<ScriptPromiseResolver> resolver_;
const String name_;
const mojom::blink::LockMode mode_;
// An opaque handle; this one end of a mojo pipe. When this is closed,
// the lock is released by the back end.
mojom::blink::LockHandlePtr handle_;
// LockManager::OnLockReleased() is called when this lock is released, to
// stop artificially keeping this instance alive. It is necessary in the
// case where the resolver's promise could potentially be GC'd.
Member<LockManager> manager_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_LOCKS_LOCK_H_
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