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(IndexedDBTransaction* transaction); 28 void DidStartTransaction(IndexedDBTransaction* transaction); 29 void DidFinishTransaction(IndexedDBTransaction* transaction); 30 31 #ifndef NDEBUG 32 bool IsActive(IndexedDBTransaction* transaction); 33 #endif 34 35 // Makes a snapshot of the transaction queue. For diagnostics only. 36 std::vector<const IndexedDBTransaction*> GetTransactions() const; 37 38 private: 39 void ProcessStartedTransactions(); 40 bool CanRunTransaction(IndexedDBTransaction* transaction); 41 42 // This is just an efficient way to keep references to all transactions. 43 std::map<IndexedDBTransaction*, scoped_refptr<IndexedDBTransaction> > 44 transactions_; 45 46 // Transactions in different states are grouped below. 47 // list_set is used to provide stable ordering; required by spec 48 // for the queue, convenience for diagnostics for the rest. 49 list_set<IndexedDBTransaction*> queued_transactions_; 50 list_set<IndexedDBTransaction*> started_transactions_; 51 }; 52 53 } // namespace content 54 55 #endif // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_TRANSACTION_COORDINATOR_H_ 56
