How automatically update EMF ResourceSet on file change?

I need to have always up to date content of some file in my program. I've created an EMF resource set.

Because resourceSet.getResource(resourceURI, true) takes a lot of time to complete I store the resource set in a static field, so files can be cached.

I.e. once resourceSet.getResource(resourceURI, true) is called for some 开发者_开发百科URI the file is cached in resourceSet.

The problem is that resourceSet doesn't update it's cache automatically:

I.e.:

resourceSet.getResource(resourceURI, true);
// delete resourceURI from file system

// Here I expect null, but old version of the file is returned
resourceSet.getResource(resourceURI, true);

How to force resourceSet to update cache if needed?

I'm using org.eclipse.emf.ecore.resource.impl.ResourceSetImpl, but probably I need another version of ResourceSet that takes modification stamps into account?

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Two things: first if you want to reload the resource, you'll have to call

aResource.unload([..]);
aResource.load([..])

As EMF is not requiring Eclipse in any way the Resource and ResourceSet classes are not the same as the Eclipse workspace IResource subclasses, which mean changing a file on the file system will not cause the EMF Resources to be reloaded.

It's pretty easy to do though, have a look on the XxxxEditor EMF generated for you, the class instantiate a IResourceChangeListener which will receive deltas from the Eclipse workspace when a file is being modified. The generated listener process these deltas by reloading the resources.

protected IResourceChangeListener resourceChangeListener = new IResourceChangeListener() {
    public void resourceChanged(IResourceChangeEvent event) {
        IResourceDelta delta = event.getDelta();
        //find out which EMF Resource matches with the IResource and reload it
    }
}