text: //
  //  SRConnectionInterface.h
  //  SignalR
  //
  //  Created by Alex Billingsley on 2/16/13.
  //  Copyright (c) 2011 DyKnow LLC. (http://dyknow.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>
  #import "SRConnectionState.h"
  
  @protocol SRClientTransportInterface;
  @class SRKeepAliveData;
  @class SRVersion;
  
  @protocol SRConnectionInterface <NSObject>
  
  ///-------------------------------
  /// @name Properties
  ///-------------------------------
  
  @property (strong, nonatomic, readwrite) SRVersion *protocol;
  @property (strong, nonatomic, readwrite) NSNumber *transportConnectTimeout;
  @property (strong, nonatomic, readwrite) SRKeepAliveData *keepAliveData;
  @property (strong, nonatomic, readwrite) NSString *messageId;
  @property (strong, nonatomic, readwrite) NSString *groupsToken;
  @property (strong, nonatomic, readonly) NSMutableDictionary *items;
  @property (strong, nonatomic, readonly) NSString *connectionId;
  @property (strong, nonatomic, readonly) NSString *connectionToken;
  @property (strong, nonatomic, readonly) NSString *url;
  @property (strong, nonatomic, readonly) NSString *queryString;
  @property (assign, nonatomic, readonly) connectionState state;
  @property (strong, nonatomic, readonly) id<SRClientTransportInterface> transport;
  @property (strong, nonatomic, readwrite) NSURLCredential *credentials;
  @property (strong, nonatomic, readwrite) NSMutableDictionary *headers;
  
  ///-------------------------------
  /// @name Connection Management
  ///-------------------------------
  
  - (BOOL)changeState:(connectionState)oldState toState:(connectionState)newState;
  - (void)stop;
  - (void)disconnect;
  
  ///-------------------------------
  /// @name Sending Data
  ///-------------------------------
  
  - (void)send:(id)object;
  - (void)send:(id)object completionHandler:(void (^)(id response, NSError *error))block;
  
  ///-------------------------------
  /// @name Receiving Data
  ///-------------------------------
  
  - (void)didReceiveData:(id)data;
  - (void)didReceiveError:(NSError *)error;
  - (void)willReconnect;
  - (void)didReconnect;
  - (void)connectionDidSlow;
  
  ///-------------------------------
  /// @name Preparing Requests
  ///-------------------------------
  
  - (void)updateLastKeepAlive;
  - (void)prepareRequest:(NSMutableURLRequest *)request;
  
  @end
  