Application Context

The »Application Context« library allows to define the context of the current environment, in order to adapt configuration options depending on the stage an app is running on.

For example if an application is running in Production mode, it should send mails and not create any log files. In Development mode however it should send mails, but to a different recipient, and create excessive log files.

export APPLICATION_CONTEXT=Development/Local/JohnDoe

if($applicationContext->isDevelopment()) {
    // … do this in development mode only
}

An environment variable sets the context, whichs is retrieved using this class.

The main advantage of this approach is, that the code may stay the same on all stages, but only configuration values may change, depending on the context.

Requirements

Installation

Packagist Entry https://packagist.org/packages/pixelbrackets/application-context/

Source

https://gitlab.com/pixelbrackets/application-context/

Mirror https://github.com/pixelbrackets/application-context/

Usage

Set the application context using an environment variable

A context may contain arbitrary sub-contexts. They are delimited with a slash. For example Production/Integration or Development/LocalMachines/JohnDoe.

The top-level contexts however, must be one of Development, Testing or Production. Testing should be used to run unit tests only. Use Production and Development and any sub-context for all stages.
```
export APPLICATION_CONTEXT=Development/Local/JohnDoe
```
or pass to the script like this
```
APPLICATION_CONTEXT=Development php index.php
```
💡 Hint: The package helhum/dotenv-connector lets you store these variables in an .env file and automatically parse it.

Integrate the ApplicationContext class

$applicationContext = new \Pixelbrackets\ApplicationContext\ApplicationContext(getenv('APPLICATION_CONTEXT'));

If the context variable is empty, then Production is the default.

Change code or configuration depending on the given context
```
$config['write-logs'] = true;
$config['mail']['to'] = 'johndoe@example.com';
if($applicationContext->isDevelopment()) {
    $config['mail']['to'] = 'test-test@localhost.tld';
}
```
Available methods to check the top-level context are isProduction(), isTesting() and isDevelopment().

If the context object is casted to a string, then the return value is the context string as set in the environment variable. This may be used to load different files as in this example.
```
$configFile = __DIR__ . '/Configuration/' . (string)$applicationContext . '.php';
if (file_exists($configFile)) {
  require($configFile);
}
```

License

GNU General Public License version 2 or later

The GNU General Public License can be found at http://www.gnu.org/copyleft/gpl.html.

Attributions:

This library is a standalone version of the Application Context in TYPO3 CMS which derived from the TYPO3 Flow framework.

Author

Dan Untenzu (mail@pixelbrackets.de / @pixelbrackets)

Changelog

./CHANGELOG.md

Contribution

This script is Open Source, so please use, patch, extend or fork it.