Groovy example source code file (LoggingExample.groovy)

This example Groovy source code file (LoggingExample.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Groovy tags/keywords

bytearrayoutputstream, bytearrayoutputstream, ending, hello, hello, iso-8859-1, printstream, printstream, starting, withlogging, world, world

The Groovy LoggingExample.groovy source code

package transforms.local

/**
* Demonstrates how a local transformation works. 
* 
* @author Hamlet D'Arcy
*/ 

def greet() {
    println "Hello World"
}
    
@WithLogging    //this should trigger extra logging
def greetWithLogging() {
    println "Hello World"
}
    
// this prints out a simple Hello World
greet()

// this prints out Hello World along with the extra compile time logging
greetWithLogging()


//
// The rest of this script is asserting that this all works correctly. 
//

// redirect standard out so we can make assertions on it
def standardOut = new ByteArrayOutputStream();
System.setOut(new PrintStream(standardOut)); 
  
greet()
assert "Hello World" == standardOut.toString("ISO-8859-1").trim()

// reset standard out and redirect it again
standardOut.close()
standardOut = new ByteArrayOutputStream();
System.setOut(new PrintStream(standardOut)); 

greetWithLogging()
def result = standardOut.toString("ISO-8859-1").split('\n')
assert "Starting greetWithLogging"  == result[0].trim()
assert "Hello World"                == result[1].trim()
assert "Ending greetWithLogging"    == result[2].trim()