Spring-DM service collections.
This package provides dynamic collections which allow iterating while the underlying content is being modified. These collections are best used through iterators. In fact, the implementation provide consistent iterators: it is guaranteed that {@link Iterator#next()} will obey the result of the previously called {@link Iterator#hasNext()} even though the collection content has been modified.

The end-user implementations are thread-safe.

Note that these collections are not meant to be generic or for usage outside the framework - they are adapters for the OSGi environment.