组件中 Mason 块的执行顺序是什么

Question

如果这些块出现在 Mason 组件中，执行顺序是什么？

• %args
• %init
• %once
• %shared
• %attr
• %flags

Answer 1

该列表中有两种不同的方块。 “可执行”块，其中包含可执行的 perl 代码，以及不可执行的块，其中包含键值对（与 perl 散列不同）。

可执行块

<%一次>

This block is executed whenever the component is loaded into memory. It is executed before any other block.

<%共享>

This block is executed once per request. It is executed before the <%init> block.

<%init>

This block is executed every time the component is called. It is executed before any other code except for code in <%once> or <%shared> blocks.

不可执行块

<%args>

This block is used to declare the arguments that a component expects. In addition, it can also be used to specify a default value if none is given when the component is called.

<%flags>

This block is used to declare special Mason flags, which are used to affect the component's behavior. Currently, there is only one flag defined, inherit.

<%attr>

This block is used to declare arbitrary key-value pairs. Unlike the <%flags> block, the contents are not used by Mason but may be used in your code.

有关详细信息，请参阅 Mason book，其中复制（和修改）了上面的一些内容。