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// Copyright 2017 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_LOCKS_LOCK_MANAGER_H_
#define CONTENT_BROWSER_LOCKS_LOCK_MANAGER_H_
#include <cstdint>
#include <map>
#include <memory>
#include <string>
#include "base/callback.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "components/services/storage/public/cpp/buckets/bucket_id.h"
#include "components/services/storage/public/cpp/buckets/constants.h"
#include "content/common/content_export.h"
#include "mojo/public/cpp/bindings/receiver_set.h"
#include "third_party/blink/public/mojom/locks/lock_manager.mojom.h"
#include "url/origin.h"
namespace content {
// One instance of this exists per StoragePartition, and services multiple
// child processes/origins. An instance must only be used on the sequence
// it was created on.
class CONTENT_EXPORT LockManager : public blink::mojom::LockManager {
public:
LockManager();
~LockManager() override;
LockManager(const LockManager&) = delete;
LockManager& operator=(const LockManager&) = delete;
// Binds |receiver| to this LockManager. |receiver| belongs to a frame or
// worker at |bucket_id|.
void BindReceiver(storage::BucketId bucket_id,
mojo::PendingReceiver<blink::mojom::LockManager> receiver);
// Request a lock. When the lock is acquired, |callback| will be invoked with
// a LockHandle.
void RequestLock(const std::string& name,
blink::mojom::LockMode mode,
WaitMode wait,
mojo::PendingAssociatedRemote<blink::mojom::LockRequest>
request) override;
// Called by a LockHandle's implementation when destructed.
void ReleaseLock(storage::BucketId bucket_id, int64_t lock_id);
// Called to request a snapshot of the current lock state for a bucket.
void QueryState(QueryStateCallback callback) override;
private:
// Internal representation of a lock request or held lock.
class Lock;
// State for a particular bucket.
class BucketState;
// State for each client held in |receivers_|.
struct ReceiverState {
ReceiverState(std::string client_id, storage::BucketId bucket_id);
ReceiverState();
ReceiverState(const ReceiverState& other);
~ReceiverState();
std::string client_id;
// BucketId of the frame or worker owning this receiver.
storage::BucketId bucket_id;
};
// Mints a monotonically increasing identifier. Used both for lock requests
// and granted locks as keys in ordered maps.
int64_t NextLockId();
mojo::ReceiverSet<blink::mojom::LockManager, ReceiverState> receivers_;
int64_t next_lock_id_ = 0;
std::map<storage::BucketId, BucketState> buckets_;
SEQUENCE_CHECKER(sequence_checker_);
base::WeakPtrFactory<LockManager> weak_ptr_factory_{this};
};
} // namespace content
#endif // CONTENT_BROWSER_LOCKS_LOCK_MANAGER_H_
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