Groovy example source code file (ClassReloadingTest.groovy)

This example Groovy source code file (ClassReloadingTest.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

classreloadingtest, classreloadingtest, file, file, groovy3981, groovy3981, groovytestcase, testreload, testreload

The Groovy ClassReloadingTest.groovy source code

package groovy.lang

class ClassReloadingTest extends GroovyTestCase {

    public void testReloading() {
        def file = File.createTempFile("TestReload", ".groovy", new File("target"))
        file.deleteOnExit()
        def className = file.name - ".groovy"

        def cl = new GroovyClassLoader(this.class.classLoader);
        def currentDir = file.parentFile.absolutePath
        cl.addClasspath(currentDir)
        cl.shouldRecompile = true

        try {
            file.write """
              class $className {
                def greeting = "hello"
              }
            """
            def groovyClass = cl.loadClass(className, true, false)
            def message = groovyClass.newInstance().greeting
            assert "hello" == message

            sleep 1500

            // change class
            file.write """
              class $className {
                def greeting = "goodbye"
              }
            """
            def success = file.setLastModified(System.currentTimeMillis())
            assert success
            sleep 500

            // reload
            groovyClass = cl.loadClass(className, true, false)
            message = groovyClass.newInstance().greeting
            assert "goodbye" == message
        } finally {
            file.delete()
        }
    }

    public void testReloadingInStringStringVersion() {
        def fileName = "Dummy3981.groovy"

        def cl = new GroovyClassLoader(this.class.classLoader);

        def classStr = """
            class Groovy3981 {
                def greeting = "hello"
            }
        """

        def groovyClass = cl.parseClass(classStr, fileName)
        def message = groovyClass.newInstance().greeting
        assert "hello" == message

        // (string, string) version should not do the caching as it breaks Spring integration (bean refreh)
        classStr = """
            class Groovy3981 {
                def greeting = "goodbye"
            }
        """
        groovyClass = cl.parseClass(classStr, fileName)
        message = groovyClass.newInstance().greeting
        assert "goodbye" == message
    }
}