private
    val buildWorkResult by lazy {
        BuildWorkResultProvider()
    }

    override fun getBuildWorkResult(): Provider<BuildWorkResult> =
        buildWorkResult
}


class BuildWorkResultProvider : AbstractMinimalProvider<BuildWorkResult>() {

    private
    var result: BuildWorkResult? = null

    fun set(result: BuildWorkResult) {
        require(this.result == null)

                parameters.workResult = flowProviders.buildWorkResult
            }.get()

        '''

        expect:
        fails()

        and:
        // TODO(mlopatkin) The error message can be improved.
        failureHasCause(~/Could not isolate value ResultSource(.*) of type ResultSource.Params/)
    }

    def "task cannot depend on buildWorkResult, fails with clear message and problem is reported"() {

        state.add(registeredFlowAction)
        return DefaultFlowScopeRegistration()
    }

    private
    fun setBuildWorkResult(failure: Throwable?) {
        flowProviders.buildWorkResult.uncheckedCast<BuildWorkResultProvider>().apply {
            set { Optional.ofNullable(failure) }
        }
    }

    private
    fun schedulePendingActions() {

You can obtain these providers from the link:{javadocPath}/org/gradle/api/flow/FlowProviders.html[FlowProviders] class.

[source,groovy]
----
flowProviders.buildWorkResult.map {
    [
        buildInvocationId: scopeIdsService.buildInvocationId,
        workspaceId: scopeIdsService.workspaceId,
        userId: scopeIdsService.userId
    ]
}
----