1 /* 2 * Copyright (C) 2007, 2008, 2013 Apple 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 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 14 * its contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #ifndef DatabaseTracker_h 30 #define DatabaseTracker_h 31 32 #include "modules/webdatabase/DatabaseError.h" 33 #include "wtf/HashMap.h" 34 #include "wtf/HashSet.h" 35 #include "wtf/ThreadingPrimitives.h" 36 #include "wtf/text/StringHash.h" 37 #include "wtf/text/WTFString.h" 38 39 namespace blink { 40 41 class Database; 42 class DatabaseContext; 43 class OriginLock; 44 class SecurityOrigin; 45 46 class DatabaseTracker { 47 WTF_MAKE_NONCOPYABLE(DatabaseTracker); WTF_MAKE_FAST_ALLOCATED; 48 public: 49 static DatabaseTracker& tracker(); 50 // This singleton will potentially be used from multiple worker threads and the page's context thread simultaneously. To keep this safe, it's 51 // currently using 4 locks. In order to avoid deadlock when taking multiple locks, you must take them in the correct order: 52 // m_databaseGuard before quotaManager if both locks are needed. 53 // m_openDatabaseMapGuard before quotaManager if both locks are needed. 54 // m_databaseGuard and m_openDatabaseMapGuard currently don't overlap. 55 // notificationMutex() is currently independent of the other locks. 56 57 bool canEstablishDatabase(DatabaseContext*, const String& name, const String& displayName, unsigned long estimatedSize, DatabaseError&); 58 String fullPathForDatabase(SecurityOrigin*, const String& name, bool createIfDoesNotExist = true); 59 60 void addOpenDatabase(Database*); 61 void removeOpenDatabase(Database*); 62 63 unsigned long long getMaxSizeForDatabase(const Database*); 64 65 void closeDatabasesImmediately(const String& originIdentifier, const String& name); 66 67 void prepareToOpenDatabase(Database*); 68 void failedToOpenDatabase(Database*); 69 70 private: 71 typedef HashSet<Database*> DatabaseSet; 72 typedef HashMap<String, DatabaseSet*> DatabaseNameMap; 73 typedef HashMap<String, DatabaseNameMap*> DatabaseOriginMap; 74 class CloseOneDatabaseImmediatelyTask; 75 76 DatabaseTracker(); 77 78 void closeOneDatabaseImmediately(const String& originIdentifier, const String& name, Database*); 79 80 Mutex m_openDatabaseMapGuard; 81 mutable OwnPtr<DatabaseOriginMap> m_openDatabaseMap; 82 }; 83 84 } // namespace blink 85 86 #endif // DatabaseTracker_h 87
