CordaInject

The CordaInject annotation should be used within Flows to inject Corda's platform services.

The annotation is placed onto a Flow's fields/properties and not on constructor parameters.

Example usage:

• Kotlin:

class MyFlow : RPCStartableFlow {

    @CordaInject
    lateinit var flowEngine: FlowEngine

    @CordaInject
    lateinit var flowMessaging: FlowMessaging

    @Suspendable
    override fun call(requestBody: RPCRequestData): String {
        ...
    }
}

• Java:

class MyFlow implements RPCStartableFlow {

    @CordaInject
    public FlowEngine flowEngine;

    @CordaInject
    public FlowMessaging flowMessaging;

    @Suspendable
    @Override
    public String call(RPCRequestData requestBody) {
        ...
    }
}

The properties annotated with CordaInject can be public or private as the reflection that sets them can bypass their visibility modifiers. Making a Flow's properties public, internal or package private is convenient for unit testing and does not affect the Flow's runtime behaviour.

The injected properties cannot be accessed within a Flow's constructor and should only be used from within a Flow's call method or subsequently executed code.