Exploring the possibilities of event-driven programming with Java and Javascript?

When performing computations on a server, the client inputs data that is captured through Javascript. A XMLHttpRequest is made to send this data to the server for processing. What happens if the computation takes an hour and the client leaves or switches off their system?

In typical practice, polling from the client side can be used to check if the result is ready. However, is there a way to implement this using callbacks? For example, could the server contact the client side Javascript the next time the client logs in to pass along the result? Any suggestions on how to achieve this without needing a webserver on the client side?

Answer №1

One effective approach is to implement polling when the user lands on the webpage.

In a similar scenario, I adjusted my polling frequency by starting with shorter intervals and gradually increasing them as needed. For your situation, consider beginning with a poll after 15 minutes, then extending the interval by 5 minutes in case of failure. If the user closes the browser, simply restart the polling process.

If desired, you can notify the user upon completion by sending an email with a callback.

During the processing phase, provide feedback on the progress made, estimated remaining time, or any other indicators to demonstrate that work is ongoing and the browser is not unresponsive. At the very least, show a timer indicating how long the processing has been active to give users a sense of advancement.

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