groovy/src/test/groovy/lang/ClassReloadingTest.groovy

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()
        }
    }
}