| /* |
| * Copyright (C) 2007, 2008, 2013 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
| * its contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef DatabaseTracker_h |
| #define DatabaseTracker_h |
| |
| #include "modules/ModulesExport.h" |
| #include "modules/webdatabase/DatabaseError.h" |
| #include "platform/heap/Handle.h" |
| #include "wtf/Functional.h" |
| #include "wtf/HashMap.h" |
| #include "wtf/HashSet.h" |
| #include "wtf/ThreadingPrimitives.h" |
| #include "wtf/text/StringHash.h" |
| #include "wtf/text/WTFString.h" |
| #include <memory> |
| |
| namespace blink { |
| |
| class Database; |
| class DatabaseContext; |
| class Page; |
| class SecurityOrigin; |
| |
| class MODULES_EXPORT DatabaseTracker { |
| WTF_MAKE_NONCOPYABLE(DatabaseTracker); USING_FAST_MALLOC(DatabaseTracker); |
| public: |
| static DatabaseTracker& tracker(); |
| // This singleton will potentially be used from multiple worker threads and the page's context thread simultaneously. To keep this safe, it's |
| // currently using 4 locks. In order to avoid deadlock when taking multiple locks, you must take them in the correct order: |
| // m_databaseGuard before quotaManager if both locks are needed. |
| // m_openDatabaseMapGuard before quotaManager if both locks are needed. |
| // m_databaseGuard and m_openDatabaseMapGuard currently don't overlap. |
| // notificationMutex() is currently independent of the other locks. |
| |
| bool canEstablishDatabase(DatabaseContext*, const String& name, const String& displayName, unsigned estimatedSize, DatabaseError&); |
| String fullPathForDatabase(SecurityOrigin*, const String& name, bool createIfDoesNotExist = true); |
| |
| void addOpenDatabase(Database*); |
| void removeOpenDatabase(Database*); |
| |
| unsigned long long getMaxSizeForDatabase(const Database*); |
| |
| void closeDatabasesImmediately(SecurityOrigin*, const String& name); |
| |
| using DatabaseCallback = Function<void(Database*)>; |
| void forEachOpenDatabaseInPage(Page*, std::unique_ptr<DatabaseCallback>); |
| |
| void prepareToOpenDatabase(Database*); |
| void failedToOpenDatabase(Database*); |
| |
| private: |
| using DatabaseSet = HashSet<CrossThreadPersistent<Database>>; |
| using DatabaseNameMap = HashMap<String, DatabaseSet*>; |
| using DatabaseOriginMap = HashMap<String, DatabaseNameMap*>; |
| |
| DatabaseTracker(); |
| |
| void closeOneDatabaseImmediately(const String& originIdentifier, const String& name, Database*); |
| |
| Mutex m_openDatabaseMapGuard; |
| |
| mutable std::unique_ptr<DatabaseOriginMap> m_openDatabaseMap; |
| }; |
| |
| } // namespace blink |
| |
| #endif // DatabaseTracker_h |