对于刚接触IM(即时通讯)开发,通过阅读成熟的商业代码能够对即时通讯软件大体上有个认识,比如消息发送,消息接受,消息监听,群聊,单聊,聊天室。我这边直接拿[Gobelieve IM]源码来做剖析。IMService在代码层级里起着承上启下的作用,负责发送消息,接受消息(聊天消息,系统消息,控制命令消息(比如邀请VOIP,退群,加群)),消息在客户端转发,消息类型判断和分发,消息observer的增加和删除,IMService本身会根据业务需求实现handlers对接到数据传输层(socket)。Observers是衔接IMService和UI层。如果只侧重于UI层开发,重点是Observers,比如PeerMessageObserver是一对一聊天监听,GroupMessageObserver:群聊天监听,RoomMessageObserver:聊天室监听。
下面直接上接口代码来说,
@class IMessage;
IMessage 模型类的前置声明
@protocol IMPeerMessageHandler <NSObject> -(BOOL)handleMessage:(IMMessage*)msg uid:(int64_t)uid; -(BOOL)handleMessageACK:(int)msgLocalID uid:(int64_t)uid; -(BOOL)handleMessageFailure:(int)msgLocalID uid:(int64_t)uid; @end
一对一聊天的hanlder定义,IM有一个ACK的设计,用来显示消息是否已经通过服务器下发到对方客户端。具体的函数,handleMessage()接收到消息的处理函数。handleMessageACK()接收到消息已读的处理函数。 handleMessageFailure()接收到消息发送失败的处理函数。
@protocol IMGroupMessageHandler <NSObject> -(BOOL)handleMessage:(IMMessage*)msg; -(BOOL)handleMessageACK:(int)msgLocalID gid:(int64_t)gid; -(BOOL)handleMessageFailure:(int)msgLocalID gid:(int64_t)gid; -(BOOL)handleGroupNotification:(NSString*)notification; @end
群聊天的hanlder定义,接口上比单聊多一个群状态改变的处理,还有就是单聊下发的是个人ID,群聊下发的是群聊ID,同样的函数,handleMessage()接收到消息的处理函数。handleMessageACK()接收到消息已读的处理函数。 handleMessageFailure()接收到消息发送失败的处理函数。handleGroupNotification(),处理群状态改变的函数,比如群名称改变,群成员改变,群解散等等事件。
@protocol IMCustomerMessageHandler <NSObject> -(BOOL)handleCustomerSupportMessage:(CustomerMessage*)msg; -(BOOL)handleMessage:(CustomerMessage*)msg; -(BOOL)handleMessageACK:(CustomerMessage*)msg; -(BOOL)handleMessageFailure:(CustomerMessage*)msg; @end
客服聊天的handler定义。
@protocol LoginPointObserver <NSObject> //用户在其他地方登陆 -(void)onLoginPoint:(LoginPoint*)lp; @end
多端登录事件监听。
@protocol PeerMessageObserver <NSObject> @optional -(void)onPeerMessage:(IMMessage*)msg; //服务器ack -(void)onPeerMessageACK:(int)msgLocalID uid:(int64_t)uid; //消息发送失败 -(void)onPeerMessageFailure:(int)msgLocalID uid:(int64_t)uid; //对方正在输入 -(void)onPeerInputing:(int64_t)uid; @end
一对一聊天的Observer的定义,提供了对输入状态监听的接口,用来实现,实时获取对方是否在编辑消息。
@protocol GroupMessageObserver <NSObject> @optional -(void)onGroupMessage:(IMMessage*)msg; -(void)onGroupMessageACK:(int)msgLocalID gid:(int64_t)gid; -(void)onGroupMessageFailure:(int)msgLocalID gid:(int64_t)gid; -(void)onGroupNotification:(NSString*)notification; @end
群聊天的Observer的定义。
@protocol RoomMessageObserver <NSObject> @optional -(void)onRoomMessage:(RoomMessage*)rm; -(void)onRoomMessageACK:(RoomMessage*)rm; -(void)onRoomMessageFailure:(RoomMessage*)rm; @end
聊天室消息Observer的定义。
@protocol RTMessageObserver <NSObject> @optional -(void)onRTMessage:(RTMessage*)rt; @end @protocol SystemMessageObserver <NSObject> @optional -(void)onSystemMessage:(NSString*)sm; @end
系统消息的Observer的定义。
@protocol CustomerMessageObserver <NSObject> @optional -(void)onCustomerMessage:(CustomerMessage*)msg; -(void)onCustomerSupportMessage:(CustomerMessage*)msg; //服务器ack -(void)onCustomerMessageACK:(CustomerMessage*)msg; //消息发送失败 -(void)onCustomerMessageFailure:(CustomerMessage*)msg; @end
客服消息的Observer的定义。
@protocol VOIPObserver <NSObject> -(void)onVOIPControl:(VOIPControl*)ctl; @end
支持整合VOIP功能的Observer的定义。
@interface IMService : TCPConnection @property(nonatomic, copy) NSString *deviceID; @property(nonatomic, copy) NSString *token; @property(nonatomic) int64_t uid; //客服app需要设置,普通app不需要设置 @property(nonatomic) int64_t appID; @property(nonatomic, weak)id<IMPeerMessageHandler> peerMessageHandler;//一对一聊天Handler @property(nonatomic, weak)id<IMGroupMessageHandler> groupMessageHandler;//群聊handler @property(nonatomic, weak)id<IMCustomerMessageHandler> customerMessageHandler;//客服handler 当前的IMService实现了三个(一对一聊天,群聊,客服)handler,可以按自己需要增加新的handler类型。消息统一在IMService做转发。 根据注册的Observer,传递到对该消息类型感兴趣的界面。 +(IMService*)instance;//IMService是单例的形式使用 -(BOOL)isPeerMessageSending:(int64_t)peer id:(int)msgLocalID; -(BOOL)isGroupMessageSending:(int64_t)groupID id:(int)msgLocalID; -(BOOL)isCustomerSupportMessageSending:(int)msgLocalID customerID:(int64_t)customerID customerAppID:(int64_t)customerAppID; -(BOOL)isCustomerMessageSending:(int)msgLocalID storeID:(int64_t)storeID; -(BOOL)sendPeerMessage:(IMMessage*)msg; -(BOOL)sendGroupMessage:(IMMessage*)msg; -(BOOL)sendRoomMessage:(RoomMessage*)msg; //顾客->客服 -(BOOL)sendCustomerMessage:(CustomerMessage*)im; //客服->顾客 -(BOOL)sendCustomerSupportMessage:(CustomerMessage*)im; -(BOOL)sendRTMessage:(RTMessage*)msg; -(void)enterRoom:(int64_t)roomID; -(void)leaveRoom:(int64_t)roomID; //正在输入 -(void)sendInputing:(MessageInputing*)inputing; //更新未读的消息数目 -(void)sendUnreadCount:(int)unread; -(void)addPeerMessageObserver:(id<PeerMessageObserver>)ob; -(void)removePeerMessageObserver:(id<PeerMessageObserver>)ob; -(void)addGroupMessageObserver:(id<GroupMessageObserver>)ob; -(void)removeGroupMessageObserver:(id<GroupMessageObserver>)ob; -(void)addLoginPointObserver:(id<LoginPointObserver>)ob; -(void)removeLoginPointObserver:(id<LoginPointObserver>)ob; -(void)addRoomMessageObserver:(id<RoomMessageObserver>)ob; -(void)removeRoomMessageObserver:(id<RoomMessageObserver>)ob; -(void)addSystemMessageObserver:(id<SystemMessageObserver>)ob; -(void)removeSystemMessageObserver:(id<SystemMessageObserver>)ob; -(void)addCustomerMessageObserver:(id<CustomerMessageObserver>)ob; -(void)removeCustomerMessageObserver:(id<CustomerMessageObserver>)ob; -(void)addRTMessageObserver:(id<RTMessageObserver>)ob; -(void)removeRTMessageObserver:(id<RTMessageObserver>)ob; -(void)pushVOIPObserver:(id<VOIPObserver>)ob; -(void)popVOIPObserver:(id<VOIPObserver>)ob; -(BOOL)sendVOIPControl:(VOIPControl*)ctl; @end
坑下挖好,慢慢补充,完整的代码和DEMO可以到[Gobelieve IM]查看。
[1]: http://developer.gobelieve.io/