Eventaggregator publish subscribe software

In publisher subscriber eventaggregator is woks as hub whose task is to aggregate all publish message and send message to interested subscribers. This is the second part of my post about event aggregator. To publish an event the publisher needs to invoke ieventaggregator. Eventaggregator gets a list of all subscriber interested messages.

This means there can be multiple publishers that raise the same event and there can be multiple subscribers listening to the same event. This article shows how to publish events and how to subscribe to them using wpf mvvm and prism. When a subscriber subscribes to interested message types via eventaggregator the eventaggregator returns a subscription token that is further used by the subscriber to keep track of its subscriptions. Consider using the eventaggregator to publish an event across modules and when sending a message between business logic code, such as controllers and presenters.

Publishersubscriber pattern with eventdelegate and. Consider the following code below which publishes the message supplied on a background thread. Eventagregator sends the messages to the interested subscriber. Publishersubscriber pattern with event delegate and. This module was heavily inspired by eric elliot and his excellent book programming javascript applications. Eventaggregator by name one can easily say that it aggregate events. It seems that this is fully designed around publishing and handling actual data. To support this, prism provides the eventaggregator component that implements a pubsub event mechanism.

Second, subscribing and handling events require the implementation of the ihandle interface, where t is the type of instances that we want to receive. By convention, the eventaggregator publishes on the ui thread using publishonuithread method. Eventaggregator is a module that acts as a single source of events for objects that wish to publish andor subscribe to events. I am having an issue subscribing to events with the event aggregator that comes as part of the prism framework. Eventaggregator receives a message sent by publishers. For publishing different type of message there is need of creating different type of publisher. Components in a composite application often need to communicate with other components and services in the application in a loosely coupled way. In sample program itemlistview user control publishes itemsaved event as shown below. Subscription it class which used to create subscription token.