public Consumer GetConsumer(String user, String tag)
{
var cs = Consumers.GetOrAdd(user, e => new Consumer(this, e));
if (!tag.IsNullOrEmpty())
{
cs.Tag = tag;
}
return(cs);
}
public virtual IConsumer <string, byte[]> Get(string groupId, string connectionName = null)
{
connectionName ??= KafkaConnections.DefaultConnectionName;
return(Consumers.GetOrAdd(
connectionName, connection => new Lazy <IConsumer <string, byte[]> >(() =>
{
var config = new ConsumerConfig(Options.Connections.GetOrDefault(connection))
{
GroupId = groupId,
EnableAutoCommit = false
};
Options.ConfigureConsumer?.Invoke(config);
return new ConsumerBuilder <string, byte[]>(config).Build();
})
).Value);
}
/// <summary>订阅主题</summary>
/// <param name="user">消费者</param>
/// <param name="tag">标签。消费者用于在主题队列内部过滤消息</param>
/// <param name="onMessage">消费消息的回调函数</param>
/// <param name="userState">订阅者</param>
/// <returns></returns>
public Boolean Add(String user, String tag, Func <Subscriber, Message, Task> onMessage, Object userState)
{
//if (Subscribers.ContainsKey(user)) return false;
//Consumer cs = null;
//if (!Consumers.TryGetValue(user, out cs))
//{
// // 新增消费者集群
// cs = new Consumer(user);
// Consumers[user] = cs;
//}
// 新增消费者集群
var cs = Consumers.GetOrAdd(user, e => new Consumer(e)
{
Host = this
});
cs.Add(userState, tag, onMessage);
// 可能是第一个订阅者，赶紧消费积累下来的消息
Notify();
return(true);
}