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1: Brief Introduction
Pub-sub mode is not generally processed by the system's key data. The Publisher does not care if the Subscriber receives the published message, nor does the subscriber know if he or she has received all the messages from the publisher. You also don't know when subscribers start receiving messages. Similar to broadcasting, radio. So logically, it's not reliable. This can be solved by combining with the request response model.
Figure 1: Simple publish-Subscribe mode
Figure 2: Publish subscription mode combined with Request response mode
2: Case
Defining the Ipublishser interface
namespacenetmqdemopublisher{ Public Interfaceipublisher:idisposable {/// <summary> ///Publish a message/// </summary> /// <param name= "Topicname" >Theme</param> /// <param name= "Data" >content</param> voidPublish (stringTopicname,stringdata); }}
Publisher Implementation Class
namespacenetmqdemopublisher{ Public classPublisher:ipublisher {Private Object_lockobject =New Object(); PrivatePublishersocket _publishersocket; PublicPublisher (stringendPoint) {_publishersocket=NewPublishersocket (); _publishersocket.options.sendhighwatermark= +; _publishersocket.bind (EndPoint); } #regionImplementation of IDisposable/// <summary> ///performs an application-defined task related to releasing or resetting an unmanaged resource. /// </summary> Public voidDispose () {Lock(_lockobject) {_publishersocket.close (); _publishersocket.dispose (); } } /// <summary> ///Publish a message/// </summary> /// <param name= "Topicname" >Theme</param> /// <param name= "Data" >content</param> Public voidPublish (stringTopicname,stringdata) { Lock(_lockobject) {_publishersocket.sendmoreframe (topicname). Sendframe (data); } } #endregion }}
Publisher window interface
function code implemented in the interface
namespacenetmqdemopublisher{ Public Partial classPublisherform:form {PrivateIpublisher Publisher; PublicPublisherform () {InitializeComponent (); Publisher=NewPublisher ("tcp://127.0.0.1:8888"); } Private voidButton1_Click (Objectsender, EventArgs e) { stringStrcontent =TextBox1.Text; ListViewItem Item=NewListViewItem (string. Format ("topic:netmq,data:{0}", strcontent)); LISTVIEW1.ITEMS.ADD (item); Publisher. Publish ("NETMQ", strcontent); } }}
Defining the Isubscriber interface
namespacenetmqdemosubscriber{ Public Interfaceisubscriber:idisposable {/// <summary> ///Events/// </summary> Eventaction<string,string>nofity; /// <summary> ///sign up for a subscription topic/// </summary> /// <param name= "Topics" ></param> voidRegistersubscriber (list<string>topics); /// <summary> ///sign up for subscription/// </summary> voidRegistersbuscriberall (); /// <summary> ///Remove all subscription messages and close/// </summary> voidRemovesbuscriberall (); }}
Subscriber Implementation Class
namespacenetmqdemosubscriber{ Public classSubscriber:isubscriber {PrivateSubscribersocket _subscribersocket =NULL; Private string_endpoint =@"tcp://127.0.0.1:9876"; PublicSubscriber (stringendPoint) {_subscribersocket=NewSubscribersocket (); _endpoint=EndPoint; } #regionImplementation of IDisposable/// <summary> ///performs an application-defined task related to releasing or resetting an unmanaged resource. /// </summary> Public voidDispose () {Throw Newnotimplementedexception (); } #endregion #regionImplementation of Isubscriber Public Eventaction<string,string> nofity =Delegate { }; /// <summary> ///sign up for a subscription topic/// </summary> /// <param name= "Topics" ></param> Public voidRegistersubscriber (list<string>topics) {Innerregistersubscriber (topics); } /// <summary> ///sign up for subscription/// </summary> Public voidRegistersbuscriberall () {innerregistersubscriber (); } /// <summary> ///Remove all subscription messages and close/// </summary> Public voidRemovesbuscriberall () {innerstop (); } #endregion #regionInternal implementation/// <summary> ///sign up for a subscription message/// </summary> /// <param name= "Topics" >Subscribe to Topics</param> Private voidInnerregistersubscriber (list<string> topics =NULL) {innerstop (); _subscribersocket=NewSubscribersocket (); _subscribersocket.options.receivehighwatermark= +; _subscribersocket.connect (_endpoint); if(NULL==topics) {_subscribersocket.subscribetoanytopic (); } Else{topics. ForEach (Item=_subscribersocket.subscribe (item)); } Task.Factory.StartNew (()= { while(true) { stringmessagetopicreceived =_subscribersocket.receiveframestring (); stringmessagereceived =_subscribersocket.receiveframestring (); Nofity (messagetopicreceived, messagereceived); } }); } /// <summary> ///Close Subscription/// </summary> Private voidInnerstop () {_subscribersocket.close (); } #endregion }}
Subscriber Window Interface
Form function code
namespacenetmqdemosubscriber{ Public Partial classSubscriberform:form {PrivateIsubscriber subscriber; PublicSubscriberform () {InitializeComponent (); } Private voidSubscriberform_load (Objectsender, EventArgs e) {Subscriber=NewSubscriber ("tcp://127.0.0.1:8888"); Subscriber. Registersbuscriberall (); Subscriber. Nofity+=Delegate(stringSstringS1) {ListViewItem Item=NewListViewItem (string. Format ("Topic:{0},data:{1}", S, s1)); LISTVIEW1.ITEMS.ADD (item); }; } }}
After running, Publiser open one, Subscirber open three, for testing
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NETMQ Publish Subscription Mode Publisher-subscriber