BxBaseModGeneralModule extends BxDolModule
BxBaseModGroupsModule extends BxBaseModProfileModule
BxBaseModNotificationsModule extends BxBaseModGeneralModule
BxBaseModProfileModule extends BxBaseModGeneralModule implements iBxDolContentInfoService, iBxDolProfileService
BxBaseModTextModule extends BxBaseModGeneralModule implements iBxDolContentInfoService

bx_srv('module', 'method', [...])

// Declaring a service in a module class
public function serviceGetProfileInfo($iProfileId)
{
    // Implementation
    return $aProfileInfo;
}

// Calling the service from another module
$aProfileInfo = bx_srv('profiles', 'get_profile_info', [$iProfileId]);

bx_alert('type', 'action', $objectId, $profileId)

// Emitting an alert when a post is created
bx_alert('bx_posts', 'add', $iPostId, $iProfileId, [
    'content' => $sContent,
    'title' => $sTitle,
    'module' => $this->_oConfig->getName()
]);

// Handling an alert in a handler class
public function response($oAlert)
{
    if ($oAlert->sUnit == 'bx_posts' && $oAlert->sAction == 'add') {
        // Process the alert, e.g., send notification
        $iPostId = $oAlert->iObject;
        $iProfileId = $oAlert->iSender;
        $aExtraParams = $oAlert->aExtras;
        
        // Implementation
    }
}

Alert handlers are described in `sys_alerts` and `sys_alerts_handlers` DB tables.

### 6.3 Inheritance/Overrides

Developers can extend base classes or override templates in higher-priority directories to customize behavior without modifying core code. This approach allows for:

* Adding new functionality to existing modules
* Modifying the behavior of core components
* Customizing the appearance of templates
* Creating specialized versions of base classes

Example of class extension:

```php
// Extending a base module class
class BxCustomTextModule extends BxBaseModTextModule
{
    // Override a method to customize behavior
    public function serviceGetBlockView($aParams)
    {
        // Custom implementation
        $aResult = parent::serviceGetBlockView($aParams);
        
        // Modify the result
        $aResult['content'] = $this->_oTemplate->parseHtmlByName('custom_block.html', [
            'content' => $aResult['content'],
            'custom_field' => $this->_oDb->getCustomData()
        ]);
        
        return $aResult;
    }
}

### 6.4 UNA REST API

The same service calls are exposed externally via OAuth2/API keys, enabling seamless integration with:
* Mobile applications
* CRM systems
* External user interfaces
* Third-party services

Example REST API call:

Response format:

```json
{
    "code": 0,
    "message": "Success",
    "data": {
        "key1": "value1",
        "key2": "value2",
        "items": [
            {"id": 1, "title": "Item 1"},
            {"id": 2, "title": "Item 2"}
        ]
    }
}