Does temporal support hot reload or dynamically changing workflow?

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Hi @sanket47 can you give more info about your use case, would help with providing more detailed answer.

Can I manipulate the workflow at runtime?

Your workflow code has to be deterministic. You can have logic in your workflow code that can chose to call activities depending on for example results of a previous activity results, see sample here. You can also made decisions by handling activity failure and do things like compensation if you wanted. Can also make decisions based on data provided by signals sent to the workflow.

Also note that you do not have to set activity types in your workflow code, and can invoke activities by their string type using untyped approach, for example:

 ActivityStub stub =
        Workflow.newUntypedActivityStub(
            ActivityOptions.newBuilder().setStartToCloseTimeout(Duration.ofMinutes(1)).build());
    stub.execute("<your_activity_type>", String.class, args);

Java SDK also provides the DynamicActivity interface (see sample here) to implement any number of activity types dynamically. This is useful for things like integration with DSL/Config for example (see sample here).

Hope this helps.

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