public static void Main(string[] args)
{
//Instantiate publishers, subscribers and PubSubService
IPublisher sportNewsPublisher = new NewsPublisher();
IPublisher politicalNewsPublisher = new NewsPublisher();
Subscriber sportSubscriber = new NewsSubscriber();
Subscriber politicsSubscriber = new NewsSubscriber();
Subscriber newsSubscriber = new NewsSubscriber();
//Declare Messages and Publish Messages to PubSubService
Message sportMsg1 = new Message("Sport", "Sport news 1");
Message sportMsg2 = new Message("Sport", "sport news 2");
Message politicsMsg3 = new Message("Politics", "politics 1223");
//
PubSubService pubSubService = new PubSubService();
sportNewsPublisher.publish(sportMsg1, pubSubService);
sportNewsPublisher.publish(sportMsg2, pubSubService);
politicalNewsPublisher.publish(politicsMsg3, pubSubService);
//Declare Subscribers
sportSubscriber.AddSubscriber("Sport", pubSubService);
politicsSubscriber.AddSubscriber("Politics", pubSubService);
newsSubscriber.AddSubscriber("Sport", pubSubService);
newsSubscriber.AddSubscriber("Politics", pubSubService);
//Trying unSubscribing a subscriber
//newsSubscriber.unSubscribe("Sport", pubSubService);
//Broadcast message to all subscribers. After broadcast, messageQueue will be empty in PubSubService
pubSubService.Broadcast();
//Print messages of each subscriber to see which messages they got
Console.WriteLine("Messages of Sport Subscriber are: ");
sportSubscriber.printMessages();
Console.WriteLine("\nMessages of Politics Subscriber are: ");
politicsSubscriber.printMessages();
Console.WriteLine("\nMessages of News Subscriber are: ");
newsSubscriber.printMessages();
Console.Write("\nPress Any Key:");
Console.ReadKey();
}
public void publish(Message Message, PubSubService PubSubService)
{
PubSubService.AddMessageToQueue(Message);
}
//Request specifically for messages related to topic from PubSubService public abstract void GetMessagesForSubscriberOfTopic(string Topic, PubSubService pubSubService);
//Unsubscribe subscriber with PubSubService for a topic public abstract void UnSubscribe(string Topic, PubSubService PubSubService);
//Add subscriber with PubSubService for a topic public abstract void AddSubscriber(string Topic, PubSubService PubSubService);
//Unsubscribe subscriber with PubSubService for a topic
public override void UnSubscribe(string Topic, PubSubService PubSubService)
{
PubSubService.RemoveSubscriber(Topic, this);
}
//Request specifically for messages related to topic from PubSubService
public override void GetMessagesForSubscriberOfTopic(string Topic, PubSubService PubSubService)
{
PubSubService.GetMessagesForSubscriberOfTopic(Topic, this);
}
//Add subscriber with PubSubService for a topic
public override void AddSubscriber(string Topic, PubSubService PubSubService)
{
PubSubService.AddSubscriber(Topic, this);
}