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// Copyright (c) 2013 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_INDEXED_DB_INDEXED_DB_TRANSACTION_COORDINATOR_H_
#define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_TRANSACTION_COORDINATOR_H_
#include <map>
#include <set>
#include <vector>
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "content/browser/indexed_db/list_set.h"
namespace content {
class IndexedDBTransaction;
// Transactions are executed in the order the were created.
class IndexedDBTransactionCoordinator {
public:
IndexedDBTransactionCoordinator();
~IndexedDBTransactionCoordinator();
// Called by transactions as they start and finish.
void DidCreateTransaction(scoped_refptr<IndexedDBTransaction> transaction);
void DidFinishTransaction(IndexedDBTransaction* transaction);
bool IsRunningVersionChangeTransaction() const;
#ifndef NDEBUG
bool IsActive(IndexedDBTransaction* transaction);
#endif
// Makes a snapshot of the transaction queue. For diagnostics only.
std::vector<const IndexedDBTransaction*> GetTransactions() const;
private:
typedef list_set<scoped_refptr<IndexedDBTransaction> > TransactionSet;
void ProcessQueuedTransactions();
bool CanStartTransaction(IndexedDBTransaction* const transaction,
const std::set<int64>& locked_scope) const;
// Transactions in different states are grouped below.
// list_set is used to provide stable ordering; required by spec
// for the queue, convenience for diagnostics for the rest.
TransactionSet queued_transactions_;
TransactionSet started_transactions_;
DISALLOW_COPY_AND_ASSIGN(IndexedDBTransactionCoordinator);
};
} // namespace content
#endif // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_TRANSACTION_COORDINATOR_H_
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