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// Copyright 2019 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_INDEXED_DB_INSTANCE_CONNECTION_COORDINATOR_H_
#define CONTENT_BROWSER_INDEXED_DB_INSTANCE_CONNECTION_COORDINATOR_H_
#include <memory>
#include <tuple>
#include "base/containers/queue.h"
#include "base/functional/callback_forward.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "content/browser/indexed_db/instance/bucket_context.h"
#include "content/browser/indexed_db/status.h"
#include "content/common/content_export.h"
namespace content::indexed_db {
class FactoryClient;
class Connection;
class Database;
struct PendingConnection;
class CONTENT_EXPORT ConnectionCoordinator {
public:
static const int64_t kMinimumIndexId = 30;
ConnectionCoordinator(Database* db, BucketContext& bucket_context);
ConnectionCoordinator(const ConnectionCoordinator&) = delete;
ConnectionCoordinator& operator=(const ConnectionCoordinator&) = delete;
~ConnectionCoordinator();
void ScheduleOpenConnection(std::unique_ptr<PendingConnection> connection);
void ScheduleDeleteDatabase(std::unique_ptr<FactoryClient> factory_client,
base::OnceClosure on_deletion_complete);
// Call this method to prune any tasks that don't want to be run during
// force close. Returns any error caused by rolling back changes.
Status PruneTasksForForceClose(const std::string& message);
void OnConnectionClosed(Connection* connection);
void OnNoConnections();
// Ack that one of the connections notified with a "versionchange" event did
// not promptly close. Therefore a "blocked" event should be fired at the
// pending connection.
void OnVersionChangeIgnored();
void BindVersionChangeTransactionReceiver();
void OnUpgradeTransactionStarted(int64_t old_version);
void OnUpgradeTransactionFinished(bool committed);
enum class ExecuteTaskResult {
// There are more tasks to run, so ExecuteTask() should be called again.
kMoreTasks,
// There are tasks but they are waiting on async work to complete. No more
// calls to ExecuteTask() are necessary.
kPendingAsyncWork,
// There was an error executing a task - see the status. The offending task
// was removed, and the caller can choose to continue executing tasks if
// they want.
kError,
// There are no more tasks to run.
kDone,
};
std::tuple<ExecuteTaskResult, Status> ExecuteTask(bool has_connections);
bool HasTasks() const { return !request_queue_.empty(); }
// Number of active open/delete calls (running or blocked on other
// connections).
size_t ActiveOpenDeleteCount() const;
// Number of open/delete calls that are waiting their turn.
size_t PendingOpenDeleteCount() const;
base::WeakPtr<ConnectionCoordinator> AsWeakPtr() {
return weak_factory_.GetWeakPtr();
}
private:
friend class Database;
class ConnectionRequest;
class OpenRequest;
class DeleteRequest;
raw_ptr<Database> db_;
raw_ref<BucketContext> bucket_context_;
base::queue<std::unique_ptr<ConnectionRequest>> request_queue_;
// `weak_factory_` is used for all callback uses.
base::WeakPtrFactory<ConnectionCoordinator> weak_factory_{this};
};
} // namespace content::indexed_db
#endif // CONTENT_BROWSER_INDEXED_DB_INSTANCE_CONNECTION_COORDINATOR_H_
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