public PolicyConfigLoader setApiResultHandler(Handler<List<Api>> apiResultHandler) {
        this.apiResultHandler = apiResultHandler;
        return this;
    }
Set the API result handler, invoked when APIs have been unmarshalled successfully.
@param apiResultHandler the API result handler
@return fluent
gateway/engine/vertx-polling/src/main/java/io/apiman/gateway/engine/vertx/polling/PolicyConfigLoader.java