1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_TRANSACTION_COORDINATOR_H_ 6 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_TRANSACTION_COORDINATOR_H_ 7 8 #include <map> 9 #include <set> 10 #include <vector> 11 12 #include "base/memory/ref_counted.h" 13 #include "base/memory/scoped_ptr.h" 14 #include "content/browser/indexed_db/list_set.h" 15 16 namespace content { 17 18 class IndexedDBTransaction; 19 20 // Transactions are executed in the order the were created. 21 class IndexedDBTransactionCoordinator { 22 public: 23 IndexedDBTransactionCoordinator(); 24 ~IndexedDBTransactionCoordinator(); 25 26 // Called by transactions as they start and finish. 27 void DidCreateTransaction(scoped_refptr<IndexedDBTransaction> transaction); 28 void DidFinishTransaction(IndexedDBTransaction* transaction); 29 30 bool IsRunningVersionChangeTransaction() const; 31 32 #ifndef NDEBUG 33 bool IsActive(IndexedDBTransaction* transaction); 34 #endif 35 36 // Makes a snapshot of the transaction queue. For diagnostics only. 37 std::vector<const IndexedDBTransaction*> GetTransactions() const; 38 39 private: 40 void ProcessQueuedTransactions(); 41 bool CanStartTransaction(IndexedDBTransaction* const transaction, 42 const std::set<int64>& locked_scope) const; 43 44 // Transactions in different states are grouped below. 45 // list_set is used to provide stable ordering; required by spec 46 // for the queue, convenience for diagnostics for the rest. 47 typedef list_set<scoped_refptr<IndexedDBTransaction> > TransactionSet; 48 TransactionSet queued_transactions_; 49 TransactionSet started_transactions_; 50 51 DISALLOW_COPY_AND_ASSIGN(IndexedDBTransactionCoordinator); 52 }; 53 54 } // namespace content 55 56 #endif // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_TRANSACTION_COORDINATOR_H_ 57