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1 /*
2  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
3  * Copyright (C) 2011 Google, Inc. All Rights Reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
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 COMPUTER, INC. ``AS IS'' AND ANY
15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  *
26  */
27 
28 #ifndef DatabaseContext_h
29 #define DatabaseContext_h
30 
31 #include "core/dom/ActiveDOMObject.h"
32 #include "core/workers/WorkerGlobalScope.h"
33 #include "platform/heap/Handle.h"
34 #include "wtf/PassRefPtr.h"
35 #include "wtf/ThreadSafeRefCounted.h"
36 
37 namespace WebCore {
38 
39 class Database;
40 class DatabaseBackendBase;
41 class DatabaseContext;
42 class TaskSynchronizer;
43 class DatabaseThread;
44 class ExecutionContext;
45 class SecurityOrigin;
46 
47 class DatabaseContext FINAL
48     : public ThreadSafeRefCountedWillBeGarbageCollectedFinalized<DatabaseContext>
49     , public ActiveDOMObject
50     , private WorkerGlobalScope::TerminationObserver {
51 public:
52     friend class DatabaseManager;
53 
54     static PassRefPtrWillBeRawPtr<DatabaseContext> create(ExecutionContext*);
55 
56     virtual ~DatabaseContext();
57     void trace(Visitor*);
58 
59     // For life-cycle management (inherited from ActiveDOMObject):
60     virtual void contextDestroyed() OVERRIDE;
61     virtual void stop() OVERRIDE;
62 
63     DatabaseContext* backend();
64     DatabaseThread* databaseThread();
65 
setHasOpenDatabases()66     void setHasOpenDatabases() { m_hasOpenDatabases = true; }
67     void didOpenDatabase(DatabaseBackendBase&);
68     void didCloseDatabase(DatabaseBackendBase&);
69     // Blocks the caller thread until cleanup tasks are completed.
70     void stopDatabases();
71 
72     bool allowDatabaseAccess() const;
73 
74     SecurityOrigin* securityOrigin() const;
75     bool isContextThread() const;
76 
77 private:
78     explicit DatabaseContext(ExecutionContext*);
79 
80     virtual void wasRequestedToTerminate() OVERRIDE;
81     void stopSyncDatabases();
82 
83     RefPtrWillBeMember<DatabaseThread> m_databaseThread;
84 #if ENABLE(OILPAN)
85     class DatabaseCloser {
86     public:
DatabaseCloser(DatabaseBackendBase & database)87         explicit DatabaseCloser(DatabaseBackendBase& database) : m_database(database) { }
88         ~DatabaseCloser();
89 
90     private:
91         DatabaseBackendBase& m_database;
92     };
93     HeapHashMap<WeakMember<DatabaseBackendBase>, OwnPtr<DatabaseCloser> > m_openSyncDatabases;
94 #else
95     // The contents of m_openSyncDatabases are raw pointers. It's safe because
96     // DatabaseBackendSync is always closed before destruction.
97     HashSet<DatabaseBackendBase*> m_openSyncDatabases;
98 #endif
99     bool m_hasOpenDatabases; // This never changes back to false, even after the database thread is closed.
100     bool m_hasRequestedTermination;
101 };
102 
103 } // namespace WebCore
104 
105 #endif // DatabaseContext_h
106