typedef NS_ENUM(NSUInteger, JConnectionStatus) {
    //disconnected
    JConnectionStatusIdle = 0,
    //connected
    JConnectionStatusConnected = 1,
    //disconnected (the user disconnected explicitly)
    JConnectionStatusDisconnected = 2,
    //connecting
    JConnectionStatusConnecting = 3,
    //connection failed; use JErrorCode to determine how to handle the failure
    JConnectionStatusFailure
};

/*!
 conversation type
 */
typedef NS_ENUM(NSUInteger, JConversationType) {

    JConversationTypeUnknown = 0,
    /*!
     private chat
     */
    JConversationTypePrivate = 1,

    /*!
     group
     */
    JConversationTypeGroup = 2,

    /*!
     chatroom
     */
    JConversationTypeChatroom = 3,

    /*!
     system conversation
     */
    JConversationTypeSystem = 4,
};

typedef NS_ENUM(NSUInteger, JPullDirection) {
    JPullDirectionNewer = 0,
    JPullDirectionOlder = 1,
};