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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。
@class IMessage;
IMessage 模型类的前置声明
@protocol IMPeerMessageHandler-(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-(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-(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//用户在其他地方登陆 -(void)onLoginPoint:(LoginPoint*)lp; @end
多端登录事件监听。
@protocol PeerMessageObserver@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@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@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@optional -(void)onRTMessage:(RTMessage*)rt; @end @protocol SystemMessageObserver @optional -(void)onSystemMessage:(NSString*)sm; @end
系统消息的Observer的定义。
@protocol CustomerMessageObserver@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-(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)idpeerMessageHandler;//一对一聊天Handler @property(nonatomic, weak)id groupMessageHandler;//群聊handler @property(nonatomic, weak)id 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 )ob; -(void)removePeerMessageObserver:(id )ob; -(void)addGroupMessageObserver:(id )ob; -(void)removeGroupMessageObserver:(id )ob; -(void)addLoginPointObserver:(id )ob; -(void)removeLoginPointObserver:(id )ob; -(void)addRoomMessageObserver:(id )ob; -(void)removeRoomMessageObserver:(id )ob; -(void)addSystemMessageObserver:(id )ob; -(void)removeSystemMessageObserver:(id )ob; -(void)addCustomerMessageObserver:(id )ob; -(void)removeCustomerMessageObserver:(id )ob; -(void)addRTMessageObserver:(id )ob; -(void)removeRTMessageObserver:(id )ob; -(void)pushVOIPObserver:(id )ob; -(void)popVOIPObserver:(id )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/
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