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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 #include "platform/heap/Handle.h"
     30 #include "wtf/Noncopyable.h"
     31 
     32 namespace blink {
     33 
     34 class IDBCursor;
     35 class IDBDisposerDispatcher;
     36 class IDBRequest;
     37 class IDBTransaction;
     38 
     39 // This class keeps track of the transactions created during the current
     40 // Javascript execution context. Transactions have an internal |active| flag
     41 // which is set to true on creation, but must be set to false when control
     42 // returns to the event loop.
     43 // Also, this class is responsible to call IDBRequest::dispose() before an
     44 // IDBRequest object dies, and responsible to call IDBCursor::dispose() before
     45 // an IDBCursor object dies.
     46 // FIXME: Rename the class name.
     47 class IDBPendingTransactionMonitor {
     48     WTF_MAKE_NONCOPYABLE(IDBPendingTransactionMonitor);
     49 
     50 public:
     51     IDBPendingTransactionMonitor();
     52     ~IDBPendingTransactionMonitor();
     53 
     54     void addNewTransaction(IDBTransaction&);
     55     void deactivateNewTransactions();
     56     void registerRequest(IDBRequest&);
     57     // It's ok to call unregisterRequest(*this) inside
     58     // IDBRequest::dispose(). But we must not call unregisterRequest() with
     59     // an object different from |this| of IDBRequest::dispose().
     60     void unregisterRequest(IDBRequest&);
     61     void registerCursor(IDBCursor&);
     62     // It's ok to call unregisterCursor(*this) inside IDBCursor::dispose(). But
     63     // we must not call unregisterCursor() with an object different from |this|
     64     // of IDBCursor::dispose().
     65     void unregisterCursor(IDBCursor&);
     66 
     67 private:
     68     PersistentHeapVector<Member<IDBTransaction> > m_transactions;
     69     RefPtr<IDBDisposerDispatcher> m_dispatcher;
     70 };
     71 
     72 } // namespace blink
     73 
     74 #endif // IDBPendingTransactionMonitor_h
     75