private IPolicyFailureWriter initPolicyFailureWriter() {
        Class<? extends IPolicyFailureWriter> clazz = apimanConfig.getPolicyFailureWriterClass(engine.getPluginRegistry());
        Map<String, String> conf = apimanConfig.getPolicyFailureWriterConfig();
        return ConfigDrivenEngineFactory.instantiate(clazz, conf);
    }
A base for those verticles that require an instantiated engine.

@author Marc Savy {@literal <msavy@redhat.com>}
gateway/platforms/vertx3/vertx3/src/main/java/io/apiman/gateway/platforms/vertx3/verticles/ApimanVerticleWithEngine.java