Groovy

NB. To test groovy you can go to groovy/bin/groovyConsole for a groovy editor.

POGOs

There are several interesting attributes of plain old groovy objects:

• Methods and classes are public by default and properties are private.

• Groovy auto-generates getters and setters for properties - setVariableName and getVariableName. If you explicitly set a property's access modifier then the getters and setters are not autogened.

• In groovy you get a map-based constructor by default. This means that you can set a class's properties without creating a constructor.

• The return key word is not needed and groovy just tries to return the last line

• You get plenty more java libraries imported automatically

Collections

• You can create a LinkedList by: def nums = [1, 2, 3] as LinkedList

• You can create a map: def map = [a:1, b:2, c:3] and can use the dot operator to add new key/value pairs.

Closures

Groovy closures act like anonymous methods that can be passed as a parameter.

The common methods that takes closures are:

• each()

• findAll()

• collect()

Configuration and Execution Phases

Other

def allows dynamic variables.

Debug

To debug a groovy file create a new groovy file and use println with a main.

static void main(String[] args)
{
    Bob bob = new Bob()
    println bob.discoTopologyWithValidSecureSolrKeyStoreConfig
}