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1 /*
2  * Copyright (C) 2010 Google Inc. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  *
8  * 1.  Redistributions of source code must retain the above copyright
9  *     notice, this list of conditions and the following disclaimer.
10  * 2.  Redistributions in binary form must reproduce the above copyright
11  *     notice, this list of conditions and the following disclaimer in the
12  *     documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25 
26 #ifndef IDBPendingTransactionMonitor_h
27 #define IDBPendingTransactionMonitor_h
28 
29 #if ENABLE(INDEXED_DATABASE)
30 
31 #include <wtf/Noncopyable.h>
32 #include <wtf/Vector.h>
33 
34 namespace WebCore {
35 
36 class IDBTransactionBackendInterface;
37 
38 // This class keeps track of the transactions created during the current
39 // Javascript execution context. A transaction is 'pending' if no asynchronous
40 // operation is currently queued for it (e.g. an IDBObjectStore::put() or similar).
41 // All pending transactions are aborted as soon as execution returns from
42 // the script engine.
43 //
44 // FIXME: move the vector of transactions to TLS. Keeping it static
45 // will not work once we add support for workers. Another possible
46 // solution is to keep the vector in the ScriptExecutionContext.
47 class IDBPendingTransactionMonitor {
48     WTF_MAKE_NONCOPYABLE(IDBPendingTransactionMonitor);
49 public:
50     static void addPendingTransaction(IDBTransactionBackendInterface*);
51     static void removePendingTransaction(IDBTransactionBackendInterface*);
52     static void abortPendingTransactions();
53 
54 private:
55     IDBPendingTransactionMonitor();
56 
57     static Vector<IDBTransactionBackendInterface*>* m_transactions;
58 };
59 
60 } // namespace WebCore
61 
62 #endif // ENABLE(INDEXED_DATABASE)
63 
64 #endif // IDBPendingTransactionMonitor_h
65