/*
 * 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 DCHECK_IS_ON()
  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 DCHECK_IS_ON()
  int m_databaseContextRegisteredCount = 0;
  int m_databaseContextInstanceCount = 0;
#endif
};

}  // namespace blink

#endif  // DatabaseManager_h