1 * tracker2.finished(operation, finishEvent)
        1 * tracker3.finished(operation, finishEvent)

        then:
        1 * tracker1.discardState(operation)
        1 * tracker2.discardState(operation)
        1 * tracker3.discardState(operation)
        0 * tracker1._
        0 * tracker2._
        0 * tracker3._
    }

    def "does not pass events to trackers for disabled mapper"() {

    void finished(BuildOperationDescriptor buildOperation, OperationFinishEvent finishEvent);

    /**
     * Signals that the state for the given build operation is no longer required.
     */
    default void discardState(BuildOperationDescriptor buildOperation) {
    }

            // Not recognized, so generate generic events, if appropriate
            fallback.finished(buildOperation, finishEvent);
        }
        for (BuildOperationTracker tracker : trackers) {
            tracker.discardState(buildOperation);
        }
    }

    private static abstract class Operation {
        public abstract void generateStartEvent(BuildOperationDescriptor buildOperation, OperationStartEvent startEvent);

    }

    @Override
    public void finished(BuildOperationDescriptor buildOperation, OperationFinishEvent finishEvent) {
    }

    @Override
    public void discardState(BuildOperationDescriptor buildOperation) {
        runningPluginApplications.remove(buildOperation.getId());
    }