Configuration load order in eZ Publish
Jerry Wang | January 25, 2011Firstly, please check the technical manual if you are not familiar with the configuration concept in eZ Publish.
In this article I will provide a short article about reading order of configuration file. I assume that you have already used eZ Publish in real projects and have idea about configuration (ini) in eZ Publish.
What is configuration’s order? When a siteaccess is used, eZ Publish reads the configuration files using the following sequence:
0 Default configuration settings – /settings/*.ini?
1 Active extension siteaccesses – /extension/my_extension/settings/siteaccess/my_site/*.ini.append.php
2 Siteaccesses - /settings/siteaccess/my_site/*.ini.append.php?
3 Active extensions – /extension/my_extension/settings/*.ini[.append.php]?
4 Global overrides – /settings/override/*.ini.append.php
In other words, eZ Publish will first read the default configuration settings. Secondly, it will read my_site/*.ini.append.php to find the siteaccesses for the active extensions during the installation. Then, it will determine which siteaccess to use according to the rules defined in the global override for “site.ini” (“/settings/override/site.ini.append.php”). When it knows which siteaccess to use, it will go into the directory of that siteaccess and read the configuration files belonging to that siteaccess. Lastly, it will go into the configuration file for the active extensions and read the configuration files for the active extensions. The settings of the siteaccess will override the default configuration settings.
But, if we have many extensions providing similar configuration information, which one we should use? That’s the issue about configuration override among extensions.
For example:
`– extension
|– ini_1
| `– settings
| `– test.ini.append.php
`– ini_2
`– settings
`– test.ini.append.php
And content of test.ini.append.php in ini_1 extension is:
[IniOrderTest]
CurrrentActiveName=ini_1
As you may guess, content of test.ini.append.php in ini_2 will be:
[IniOrderTest]
CurrrentActiveName=ini_2
So, if we want to read content of ‘CurrentActiveName’ in block ‘IniOrderTest’, which value should it be? The truth is: it depends on the load order of extensions.
For eZ Publish version less than 4.3, the load order is defined in ‘ActiveExtensions[]‘ under ‘ExtensionSettings’ block. For example:
[ExtensionSettings]
ActiveExtensions[]
ActiveExtensions[]=ini_1
ActiveExtensions[]=ini_2
Then the value for ‘CurrentActiveName’ in block ‘IniOrderTest’ should be ‘ini_1′, because eZ Publish uses prepending order to register extensions into configuration list during the activation of extensions. That means eZ Publish firstly activates extension ‘ini_1′ and register this extension into the list, then activates extension ‘ini_2′ and prepends ‘ini_2′ into the list. So, at the moment of reading configuration value, the order will firstly be ‘ini_2′, then ‘ini_1′.
The situation has changed since eZ Publish 4.4. This version introduces a new concept about extension dependency called ‘topology’. You can have a look at ‘extension.xml’ file in ezOE extension, which required ‘ezjscore’ extension as defined.
Let’s see how ‘extension.xml’ affects the result of configuration. We define dependency in ini_2 as following:
<dependencies>
<uses>
<extension name=”ini_1″ />
</uses>
</dependencies>
The word ‘extends’ define the ‘before’ relation, and words ‘required’ or ‘uses’ define the ‘after’ relation. The above example means that extension ‘ini_2’ uses extension ‘ini_1′, so the extension ‘ini_1’ should be firstly activated. Actually, this relation can be represented as:
[ExtensionSettings]
ActiveExtensions[]
ActiveExtensions[]=ini_1
ActiveExtensions[]=ini_2
As you know, configuration system will prepend ini_2 before ini_1. So, ini_1 configuration value can override the value from ini_2. When you want to read ‘CurrentActiveName’ in block ‘IniOrderTest’, you will get ‘ini_1′.
In conclusion, eZ Publish 4.4 has improved loading order of extension by introducing the ‘topology’. Keep in mind, the extension order is the reverse of the order of configuration list, since it uses prepending method when activates extensions.
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