Proper design pattern for many subjects to one observer

Question

In observer pattern normally there is a one-to-many relationship between the subject and observers (there are one subject and many observers).

But I have a problem where in my implementation, there are many subjects (eg: A, B, C) that are returning objects but only one observer (eg: O) is there to take outputs of those subjects into a queue and process them one after another.

What sort of design pattern / paradigm can I use for this?

Answer 1

如果您需要使用队列，可以使用Producer / Consumer模式。

观察者模式的不同之处在于观察者通常知道可观察者。在生产者/消费者模式中，观察对象（对象，信息，事件的生产者）和观察者（消费者）完全分离。 无论有多少（甚至没有）生产者，消费者都不会受到影响。

另一个区别当然是，消费者必须主动轮询队列。

＆＃34;挑战＆＃34;使用此模式是在两端访问队列时的正确同步。但当然有一些库可以解决这个问题。