bruth commented on a change in pull request #1764: WIP - Pulsar Go client library URL: https://github.com/apache/incubator-pulsar/pull/1764#discussion_r187572451
########## File path: pulsar-client-go/examples/consumer-listener/consumer-listener.go ########## @@ -0,0 +1,55 @@ +// +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. +// + +package main + +import ( + "../../pulsar" + "fmt" + "log" +) + +func main() { + client := pulsar.NewClient(). + ServiceUrl("pulsar://localhost:6650").Build() + + channel := make(chan pulsar.ConsumerMessage) + + consumer, err := client.NewConsumer(). Review comment: Hm, yes default zero values can be a nuisance. There are a couple patterns for this case, but they are escaping me at the moment. One more general alternative is to stick with the `New*` functions to initialize a client, consumer, producer, and reader value with the defaults preset on the struct which then allows the user to override the options they want. The `New` call could take the required options. ```go // Constructor with required options. c := NewConsumer(topic) // Override default c.Timeout = 10*time.Second // Rest.. if err := c.Subscribe(); err != nil { } ``` So in this set, trading the builder pattern for a simple struct that is returned that can be mutated before making the connection. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services