//
  //  VKOperation.h
  //
  //  Copyright (c) 2014 VK.com
  //
  //  Permission is hereby granted, free of charge, to any person obtaining a copy of
  //  this software and associated documentation files (the "Software"), to deal in
  //  the Software without restriction, including without limitation the rights to
  //  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
  //  the Software, and to permit persons to whom the Software is furnished to do so,
  //  subject to the following conditions:
  //
  //  The above copyright notice and this permission notice shall be included in all
  //  copies or substantial portions of the Software.
  //
  //  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  //  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
  //  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
  //  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  //  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  //  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  #import <Foundation/Foundation.h>
  
  typedef enum {
      VKOperationPausedState = -1,
      VKOperationReadyState = 1,
      VKOperationExecutingState = 2,
      VKOperationFinishedState = 3,
  } VKOperationState;
  
  /**
  Basic class for operations
  */
  @interface VKOperation : NSOperation
  /// This operation state. Value from VKOperationState enum
  @property(readwrite, nonatomic, assign) VKOperationState state;
  /// Operation working lock
  @property(readwrite, nonatomic, strong) NSRecursiveLock *lock;
  /// Sets dispatch queue for returning result
  @property(nonatomic, assign) dispatch_queue_t responseQueue;
  @end