| Eclipse, Plugins, Statics and Classpaths [message #149359] |
Thu, 20 April 2006 17:52 |
Eclipse User |
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Originally posted by: SSalewski.Gmx.net
Hello,
I am relative new in plugin-programming under eclipse, and there's a
problem I am not able to solve: I want to let two Plugins use a class
ProjectProxy.
(note: the code is extremly shortened; assume that the way the factories
and its implementations are bound together cannot be modified - and I am
sorry for my not-so-good-english ;)
Plugin A has a plugin class AB like this:
class AB {
public void start() {
String pp = ProjectProxy.class.getName();
String io = "my.package.java1_4impl.ProjectProxyObject";
...
Factory factory = (Factory) Class.forName(factoryClass).newInstance();
FactoryObjectImplementation implementation
= (FactoryObjectImplementation) Class.forName(implClass).newInstance();
factory.bind(implementation);
...
}
}
Plugin B has the class ProjectProxy and the plugin class BB:
class ProjectProxy {
private static ProjectFactoryObject pfo = null;
...
public boolean bind(Object implementation) {
if (implementation instanceof ProjectFactoryObject) {
return ProjectFactory.bind((ProjectFactoryObject)
implementation);
}
return false;
}
...
public static boolean bind(ProjectFactoryObject implementation) {
pfo = (ProjectFactoryObject) implementation;
return true;
}
...
public static Project newProject(String projectName) {
if (pfo == null)
return null;
return pfo.newProject(projectName);
}
}
class BB {
public void start(BundleContext context) throws Exception {
...
this.project
= new ProjectProxy(ProjectFactory.newProject("New Project", true));
...
}
}
First, plugin AB will be called at startup. The start() method in BB will
be called (implicit) after the binding was made.
Problem: When the Plugin AB calls the bind-method, the static variable fop
in ProxyFactory is set correctly. But if the plugin BB tries to call the
newProject(...) method of ProxyFactory, fop is always null.
I know this is because of the classloader-concept of eclipse (there is an
interessting article from Martin Lippert on the web). But I was not able
to solve this problem. Has anyone an idea for this?
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