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In the above code, we use three functions, order500, order200, orderNormal to handle its own business logic, If the current own function cannot handle things, We pass it to the following function to handle it. By analogy, Until there is a function that can handle him, Otherwise, the responsibility chain mode will leave the chain directly, telling that it cannot be processed and throwing an error prompt. Although the above code can be used as the responsibility chain mode, we can see from the above code that the Order500 function depends on functions such as Order200, so there must be this function, which also violates the open-closed principle in object-oriented. Let's continue to understand writing flexible and detachable responsibility chain nodes.Hardware Firewall: Some firewall functions are implemented at the hardware level, while the other functions are implemented based on software, with high performance and high cost.继续按兵不动也有些不好意思。Once the number of sub-conclusions reaches more than five, at first glance it will appear messy and affect the viewer's grasp of the whole. This situation needs to be avoided. There is a limit to the human brain. If you get too much information at one time, you will not be able to understand it.哥哥，你们是来抓我们的？看着不像呢，哥哥像好人。