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Backend modules are often overlooked because we
tend to be less aware of them. We should try to remember that backend modules
are very powerful and can greatly enhance the administrative capabilities of
components.
Modules are integral to the success of a component. It's not uncommon for one
component to include several modules.
The simple nature of modules makes it easy to become sophisticated about them.
It's important to remember that because they are used and rendered so frequently,
efficient code is essential to good module design.
Plugin Design
Plugins enable us to modify system functionality without the need to alter existing
code. For example, plugins can be used to alter content before it is displayed, extend
search functionality, or implement a custom authentication mechanism. As an
example, this chapter shows how to replace a string in an article with an image.
Plugins use the Observer pattern to keep an eye on events. It is by listening to these
events that we can modify the system functionality.


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