text: /*
   * Copyright (C) 2012 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.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. OR
   * 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 DatabaseManager_h
  #define DatabaseManager_h
  
  #include "modules/webdatabase/DatabaseContext.h"
  #include "modules/webdatabase/DatabaseError.h"
  #include "platform/heap/Handle.h"
  #include "wtf/Assertions.h"
  #include "wtf/Forward.h"
  #include "wtf/HashMap.h"
  
  namespace blink {
  
  class Database;
  class DatabaseCallback;
  class DatabaseContext;
  class ExceptionState;
  class SecurityOrigin;
  class ExecutionContext;
  
  class DatabaseManager {
      WTF_MAKE_NONCOPYABLE(DatabaseManager); USING_FAST_MALLOC(DatabaseManager);
  public:
      static DatabaseManager& manager();
      static void terminateDatabaseThread();
  
      // These 2 methods are for DatabaseContext (un)registration, and should only
      // be called by the DatabaseContext constructor and destructor.
      void registerDatabaseContext(DatabaseContext*);
      void unregisterDatabaseContext(DatabaseContext*);
  
  #if ENABLE(ASSERT)
      void didConstructDatabaseContext();
      void didDestructDatabaseContext();
  #else
      void didConstructDatabaseContext() { }
      void didDestructDatabaseContext() { }
  #endif
  
      static void throwExceptionForDatabaseError(DatabaseError, const String& errorMessage, ExceptionState&);
  
      Database* openDatabase(ExecutionContext*, const String& name, const String& expectedVersion, const String& displayName, unsigned estimatedSize, DatabaseCallback*, DatabaseError&, String& errorMessage);
  
      String fullPathForDatabase(SecurityOrigin*, const String& name, bool createIfDoesNotExist = true);
  
  private:
      DatabaseManager();
      ~DatabaseManager();
  
      // This gets a DatabaseContext for the specified ExecutionContext.
      // If one doesn't already exist, it will create a new one.
      DatabaseContext* databaseContextFor(ExecutionContext*);
      // This gets a DatabaseContext for the specified ExecutionContext if
      // it already exist previously. Otherwise, it returns 0.
      DatabaseContext* existingDatabaseContextFor(ExecutionContext*);
  
      Database* openDatabaseInternal(ExecutionContext*,
          const String& name, const String& expectedVersion, const String& displayName,
          unsigned estimatedSize, bool setVersionInNewDatabase, DatabaseError&, String& errorMessage);
  
      static void logErrorMessage(ExecutionContext*, const String& message);
  
      // m_contextMap can have two or more entries even though we don't support
      // Web SQL on workers because single Blink process can have multiple main
      // contexts.
      typedef PersistentHeapHashMap<Member<ExecutionContext>, Member<DatabaseContext>> ContextMap;
      ContextMap m_contextMap;
  #if ENABLE(ASSERT)
      int m_databaseContextRegisteredCount;
      int m_databaseContextInstanceCount;
  #endif
  };
  
  } // namespace blink
  
  #endif // DatabaseManager_h
  