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# Using the configuration proxy¶

The configuration proxy provides access to the EM configuration, which is done when installing/updating an extension and defined in an extension’s “ext_conf_template.txt”.Apart from getting configuration values easily, the proxy can fake configuration values. This feature is supposed to testing purposes.The configuration proxy is a singleton and is implemented lazily.

## Use the proxy in a class¶

Get the instance of your extension’s proxy. Pass the extension key without the prefix “tx” for this. There is no need for any further initialization as this is done automatically if necessary:

$proxyInstance = Tx_Oelib_ConfigurationProxy::getInstance('extension');  Now you can get configuration values. Therefore use the getter for the expected type of value and pass the configuration value’s key: $proxyInstance->getConfigurationValueString('configurationValue');
$proxyInstance->getConfigurationValueBoolean('otherConfigurationValue');$proxyInstance->getConfigurationValueInteger('againAConfigurationValue');


## Use the proxy for unit tests¶

In addition to the getters described above, the proxy provides setters to fake the configuration for testing purposes. The setters overwrite existing configuration values and can also set totally new values which are not defined in the “ext_conf_template.txt” if this is needed:

$proxyInstance->setConfigurationValueString('configurationValue', 'any string needed for tests');$proxyInstance->setConfigurationValueBoolean('newValue', true);


To ensure an unchanged configuration, you can retrieve the original configuration. Usually this should not be necessary:

$proxyInstance->retrieveConfiguration();  For debugging, it might be useful to get the complete configuration: $proxyInstance->getCompleteConfiguration();