text: /*
   * 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 THIRD_PARTY_BLINK_RENDERER_MODULES_WEBDATABASE_DATABASE_TASK_H_
  #define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBDATABASE_DATABASE_TASK_H_
  
  #include "base/dcheck_is_on.h"
  #include "base/macros.h"
  #include "base/memory/ptr_util.h"
  #include "base/synchronization/waitable_event.h"
  #include "third_party/blink/renderer/modules/webdatabase/database.h"
  #include "third_party/blink/renderer/modules/webdatabase/database_basic_types.h"
  #include "third_party/blink/renderer/modules/webdatabase/database_error.h"
  #include "third_party/blink/renderer/modules/webdatabase/sql_transaction_backend.h"
  #include "third_party/blink/renderer/platform/heap/handle.h"
  #include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
  #include "third_party/blink/renderer/platform/wtf/threading.h"
  #include "third_party/blink/renderer/platform/wtf/vector.h"
  
  namespace blink {
  
  class DatabaseTask {
    USING_FAST_MALLOC(DatabaseTask);
  
   public:
    virtual ~DatabaseTask();
  
    void Run();
  
    Database* GetDatabase() const { return database_.Get(); }
  
   protected:
    DatabaseTask(Database*, base::WaitableEvent* complete_event);
  
   private:
    virtual void DoPerformTask() = 0;
    virtual void TaskCancelled() {}
  
    CrossThreadPersistent<Database> database_;
    base::WaitableEvent* complete_event_;
  
  #if DCHECK_IS_ON()
    virtual const char* DebugTaskName() const = 0;
    bool complete_;
  #endif
  
    DISALLOW_COPY_AND_ASSIGN(DatabaseTask);
  };
  
  class Database::DatabaseOpenTask final : public DatabaseTask {
   public:
    DatabaseOpenTask(Database*,
                     bool set_version_in_new_database,
                     base::WaitableEvent*,
                     DatabaseError&,
                     String& error_message,
                     bool& success);
  
   private:
    void DoPerformTask() override;
  #if DCHECK_IS_ON()
    const char* DebugTaskName() const override;
  #endif
  
    bool set_version_in_new_database_;
    DatabaseError& error_;
    String& error_message_;
    bool& success_;
  };
  
  class Database::DatabaseCloseTask final : public DatabaseTask {
   public:
    DatabaseCloseTask(Database*, base::WaitableEvent*);
  
   private:
    void DoPerformTask() override;
  #if DCHECK_IS_ON()
    const char* DebugTaskName() const override;
  #endif
  };
  
  class Database::DatabaseTransactionTask final : public DatabaseTask {
   public:
    // Transaction task is never synchronous, so no 'synchronizer' parameter.
    explicit DatabaseTransactionTask(SQLTransactionBackend*);
    ~DatabaseTransactionTask() override;
  
    SQLTransactionBackend* Transaction() const { return transaction_.Get(); }
  
   private:
    void DoPerformTask() override;
    void TaskCancelled() override;
  #if DCHECK_IS_ON()
    const char* DebugTaskName() const override;
  #endif
  
    CrossThreadPersistent<SQLTransactionBackend> transaction_;
  };
  
  class Database::DatabaseTableNamesTask final : public DatabaseTask {
   public:
    DatabaseTableNamesTask(Database*,
                           base::WaitableEvent*,
                           Vector<String>& names);
  
   private:
    void DoPerformTask() override;
  #if DCHECK_IS_ON()
    const char* DebugTaskName() const override;
  #endif
  
    Vector<String>& table_names_;
  };
  
  }  // namespace blink
  
  #endif  // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBDATABASE_DATABASE_TASK_H_
  