AsyncNotifications

Work in progress

It is an example of Client-Server application model, that demonstrates Microsoft AsyncRPC technology in action.

This project contains two applications:

• Server app
• Client app

Server application

After this program started it is ready to receive subscription requests from many clients. It receives a synchronous client RPC-call, which is an request for subscription, register it inside itself and sends a reply for success of failure of registration. After this action it receives an asynchronous call and leaves it pending until a specified event happened (see more about events in Events section). In case of an event server invokes RpcAsyncCompleteCall to send some information about it to subscribed client. If all client’s subscriptions are cancelled asyncronous call will be aborted with ERROR_CANCELLED status. In case of cancellation of a subscription server decreases an internal binded with concrete client counter (not to cancel asynchronous call mistakenly).

Client application

Client will be able to subscribe to any number of distinct events. It’ll wait for asyncroous call result in a separate thread in order to allow concurrent waiting and subscribing.

Events

In order to simplify this application events will be as simple as possible: After minimal preparations server will wait for input with keyboard. Subscription will be a letter which should be the first letter of servers’ input string. Server will be able to handle any number of input strings.

Commands

Client app will have simple rules applied to it’s input:

• quit will close client in common way with all cleaning procedures
• exit will terminate client immediately (by calling std::terminate)
• +[a-zA-Z] will send a subscription request to server
• -[a-zA-Z] will send a cancellation request to server
• any other string will be ignored

Server’s commands will be simpler:

• quit will close client in common way with all cleaning procedures
• exit will terminate client immediately (by calling ExitProcess)
• any other string will be assumed as an input

Session example

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