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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 CONTENT_BROWSER_LOCKS_LOCK_CONTEXT_H_
#define CONTENT_BROWSER_LOCKS_LOCK_CONTEXT_H_
#include <memory>
#include <string>
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/sequence_checker.h"
#include "content/public/browser/browser_context.h"
#include "mojo/public/cpp/bindings/binding_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 LockManager : public base::RefCountedThreadSafe<LockManager>,
public blink::mojom::LockManager {
public:
LockManager();
void CreateService(blink::mojom::LockManagerRequest request,
const url::Origin& origin);
// 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,
blink::mojom::LockRequestAssociatedPtrInfo request) override;
// Called by a LockHandle's implementation when destructed.
void ReleaseLock(const url::Origin& origin, int64_t lock_id);
// Called to request a snapshot of the current lock state for an origin.
void QueryState(QueryStateCallback callback) override;
protected:
friend class base::RefCountedThreadSafe<LockManager>;
~LockManager() override;
private:
// Internal representation of a lock request or held lock.
class Lock;
// State for a particular origin.
class OriginState;
// State for each client held in |bindings_|.
struct BindingState {
url::Origin origin;
std::string client_id;
};
bool IsGrantable(const url::Origin& origin,
const std::string& name,
blink::mojom::LockMode mode) const;
// Mints a monotonically increasing identifier. Used both for lock requests
// and granted locks as keys in ordered maps.
int64_t NextLockId();
void Break(const url::Origin& origin, const std::string& name);
// Called when a lock is requested and optionally when a lock is released,
// to process outstanding requests within the origin.
void ProcessRequests(const url::Origin& origin);
mojo::BindingSet<blink::mojom::LockManager, BindingState> bindings_;
int64_t next_lock_id_ = 0;
std::map<url::Origin, OriginState> origins_;
SEQUENCE_CHECKER(sequence_checker_);
base::WeakPtrFactory<LockManager> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(LockManager);
};
} // namespace content
#endif // CONTENT_BROWSER_LOCKS_LOCK_CONTEXT_H