z3c.mountpoint 0.1

Traversal

So let’s have a look at the traversal next. Before being able to traverse, we need to register the special mount point traverser:

>>> import zope.component
>>> zope.component.provideAdapter(mountpoint.MountPointTraverser)

We should now be able to traverse to the mounted object now:

>>> from zope.publisher.browser import TestRequest
>>> req = TestRequest()

>>> from zope.traversing.publicationtraverse import PublicationTraverser
>>> traverser = PublicationTraverser()
>>> traverser.traversePath(req, conn1.root()['Application'], 'mp/F2-1')
<zope.site.folder.Folder object at ...>

When we add a new object remotely, it available via the mount point as well:

>>> conn2.root()['Application']['Folder2-1']['Folder2-1.1'] = Folder()
>>> transaction.commit()

>>> tuple(traverser.traversePath(
...    req, conn1.root()['Application'], 'mp/F2-1').keys())
(u'Folder2-1.1',)

Now, by default the objects refer to their original path:

>>> f211 = traverser.traversePath(
...    req, conn1.root()['Application'], 'mp/F2-1/Folder2-1.1')

>>> from zope.traversing.browser import absoluteurl
>>> absoluteurl.absoluteURL(f211, req)
'http://127.0.0.1/Folder2-1/Folder2-1.1'

This package solves that problem by wrapping all object by a special remote location proxy and providing a special wrapping traverser for those proxies:

>>> from z3c.mountpoint import remoteproxy
>>> zope.component.provideAdapter(remoteproxy.RemoteLocationProxyTraverser)

>>> f211 = traverser.traversePath(
...    req, conn1.root()['Application'], 'mp/F2-1/Folder2-1.1')
>>> absoluteurl.absoluteURL(f211, req)
'http://127.0.0.1/mp/F2-1/Folder2-1.1'

Updating the Mount Point

Whenever any attribute on the mount point is modified, the mount object is updated. For example, when the object path is changed, the object is adjusted as well. This is done with an event subscriber:

>>> mountPoint.objectPath = u'/Folder2-1/Folder2-1.1'

>>> modifiedEvent = object()
>>> mountpoint.updateMountedObject(mountPoint, modifiedEvent)

>>> f211 == mountPoint.object
True