CacheableDependencyInterface & friends

To make dealing with cacheability metadata (cache tags, cache contexts and max-age) easier, Drupal 8 has CacheableDependencyInterface.

Data definitions (TBD)

Initial stub page, just to outline the different child-pages we need.

A data definition describes how to interact with a given data type including configuration, constraints, and labels. This is most useful when defining complex data types such as a hierarchical data structure. The ComplexDataDefinitionBase class can be used as a base class.

A fictitious example: Create a definition for a Color data type that has 3 properties for red, green, and blue integer values.

Process the Block Config Form

Add the following method to the HelloBlock class. In this example, it is located in the src/Plugin/Block/HelloBlock.php file, but as you start thinking in a more OOP fashion, where it is physically located in the file structure is less important than where it is in the namespace. If you are a very clever OO programmer, you keep the two things very tightly aligned. But just in case, it is actually the namespace, very much like the Module folder name vs.

How Data relates to Table Wizard

Needs review/summary update, but the main information is in this rather old support request:
#580650: Documentation task: How Data relates to Table Wizard

Features 3.x for Drupal 8

Features 3.x for Drupal 8 is a fundamental rewrite of the module to work with the Drupal 8 configuration management API.

Features 3.x provides is a toolset for building well designed and interoperable Drupal 8 features and distributions.

Parameters values validation in routes

Drupal 8's routes placeholder values may validate.route system care of which type of parameters values will passed in URL. placeholder values may any thing like string, integer and any pattern that will validate. if parameters values valiadtaion is failed then through page not found.

We can define constraints for the values of the placeholders as regular expressions.
For example in example.routing.yml:
{name} placeholder should string and contains only uppercase and lowercase alphabet.

Pages

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