Here is code, as opposed to "pretty pictures" -- LOL ;-) This is intended to demonstrate how simple Had is in contrast to normal Service Locator or Inversion of Control (Dependency Injection) frameworks. Remember, THIS IS ALL THE CODE. There are no NanoContainers. Not XML. No Config classes, etc. Where you want to have a single class with potential changes in implementations, you simply do not change the name of the class, e.g. provide new implementations under the same name. Where you want implementations that are different, e.g. if the Action class were an interface, you simply use different names for the different implementations and then you can hot deploy variations on the code in classes with those names. This allows you to change an existing implementation radically either by hot deploy or by name. Which you want to do depends on the situation. ActionServlet would want to be, for example, an interface that allowed differing implementations under "ActionServlet" without having different named implemenations, like you have with IoC and Service Locator solutions. On the other hand, you also would get hot deploy of various Action implementations under different names, e.g. LogonAction, PublishAction, etc.
A working application with the App interface and client tester is available in a zip file, classes.zip, at http://131.191.32.112:8080/classes.zip This code has some additions that allow us to see whether or not a particular object has the last loaded implementation of AppImpl. The code includes: App.java AppImpl.java AppHotFactory.java TestAppClientTester.java SiteConstant.java Classpath.java.java To use a new AppImpl, all you have to do is to drop the AppImpl.class into the classes/deploy/com/crackwillow/app directory and call AppHotFactory.loadAppImpl(). To see the "name" command work with the client, start the client with java com.crackwillow.testing.TestAppClientTester NEW_NAME Jack -- "You can't wake a person who is pretending to be asleep." ~Native Proverb~ "Each man is good in His sight. It is not necessary for eagles to be crows." ~Hunkesni (Sitting Bull), Hunkpapa Sioux~ --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
