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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_MANAGER_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_LOCKS_LOCK_MANAGER_H_
#include "base/macros.h"
#include "base/optional.h"
#include "third_party/blink/public/mojom/feature_observer/feature_observer.mojom-blink.h"
#include "third_party/blink/public/mojom/locks/lock_manager.mojom-blink-forward.h"
#include "third_party/blink/renderer/bindings/core/v8/string_or_string_sequence.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_lock_options.h"
#include "third_party/blink/renderer/modules/locks/lock.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
#include "third_party/blink/renderer/platform/heap/heap_allocator.h"
#include "third_party/blink/renderer/platform/mojo/heap_mojo_remote.h"
#include "third_party/blink/renderer/platform/mojo/heap_mojo_wrapper_mode.h"
namespace blink {
class ScriptPromise;
class ScriptState;
class V8LockGrantedCallback;
class LockManager final : public ScriptWrappable,
public ExecutionContextLifecycleObserver {
DEFINE_WRAPPERTYPEINFO();
USING_GARBAGE_COLLECTED_MIXIN(LockManager);
public:
explicit LockManager(ExecutionContext*);
ScriptPromise request(ScriptState*,
const String& name,
V8LockGrantedCallback*,
ExceptionState&);
ScriptPromise request(ScriptState*,
const String& name,
const LockOptions*,
V8LockGrantedCallback*,
ExceptionState&);
ScriptPromise query(ScriptState*, ExceptionState&);
void Trace(Visitor*) override;
// Terminate all outstanding requests when the context is destroyed, since
// this can unblock requests by other contexts.
void ContextDestroyed() override;
// Called by a lock when it is released. The lock is dropped from the
// |held_locks_| list. Held locks are tracked until explicitly released (or
// context is destroyed) to handle the case where both the lock and the
// promise holding it open have no script references and are potentially
// collectable. In that case, the lock should be held until the context
// is destroyed. See https://crbug.com/798500 for an example.
void OnLockReleased(Lock*);
private:
class LockRequestImpl;
// Track pending requests so that they can be cancelled if the context is
// terminated.
void AddPendingRequest(LockRequestImpl*);
void RemovePendingRequest(LockRequestImpl*);
bool IsPendingRequest(LockRequestImpl*);
// Query the ContentSettingsClient to ensure access is allowed from
// this context. The first call invokes a synchronous IPC call, but
// the result is cached for subsequent accesses.
bool AllowLocks(ScriptState* script_state);
HeapHashSet<Member<LockRequestImpl>> pending_requests_;
HeapHashSet<Member<Lock>> held_locks_;
HeapMojoRemote<mojom::blink::LockManager,
HeapMojoWrapperMode::kWithoutContextObserver>
service_;
HeapMojoRemote<mojom::blink::FeatureObserver,
HeapMojoWrapperMode::kWithoutContextObserver>
observer_;
base::Optional<bool> cached_allowed_;
DISALLOW_COPY_AND_ASSIGN(LockManager);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_LOCKS_LOCK_MANAGER_H_
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