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Informations about the package lazy-props
Lazy-Properties
- Lazy-Properties
- Installation
- Usage
- Declaring Lazy Properties
- Common Initializer Method
- Subclasses's Readonly, Lazy-initialized Properties
Installation
Install lazy-props via Composer:
Usage
Declaring Lazy Properties
Upon instantiation of the Database class, the connection property will be unset, so that calls to $db->connection are directed to the __get magic method provided by the LazyProperties trait. This method will then call the createConnection method on the first call to $db->connection, and set the connection property to the return value of that method. Subsequent calls to $db->connection will return the already initialized value.
Common Initializer Method
If your class declares more than one lazy property, you can use a common initializer method for all of them:
You can also you the InitializerMethod annotation on your class to save yourself some typing:
Subclasses's Readonly, Lazy-initialized Properties
Take a look at the following example:
It looks fine, and it is...
But, when you change the y property to be readonly:
... you will get an error by just instantiating the Y class:
To fix this; each class has to unset (uninitialize) its own lazy properties, to do so, use the LazyPropertiesExtension trait in subclasses (of all generations) and annotate them with the ExtendedLazyProperties annotation giving the names of the extended lazy properties:
