This is a design consideration between client - server interaction, i.e. whether client should call the server and pull the data from the server as and when required. Or the server should push the data to the client whenever there is some new data for the client.
Out of these two approaches, the first approach i.e. Client Pull is the most common approach where client opens a connection with the server (using any client/server protocol) and ask the server for the data. Here client pull the required data from the server as and when required.
Second approach is, where the server keep track of all its clients. Whenever server find any data which should be sent to the client, it pushes the data to the client. In this approach, there should be some provision using which server can interact to the client, like client should have some server socket open with it or client request should be hold on server for pending response for a long time. Now server keep track of all its clients. If we are working with server socket at the client, then it should be opened for all the time, so that server can connect to it anytime for pushing the data to client.
Sometime we find a need where server need to update the client for any latest data, like share trading software or weather information software. Here server keep getting updated data from multiple sources and now same data should be updated to all client terminals of the server. Now above mentioned both approaches can be used here as mentioned below:
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