code: public Collection<String> getLocalPlacements() {
          List<String> placements = Lists.newArrayList();
          for (String placementName : _placementFactory.getValidPlacements()) {
              Placement placement;
              try {
                  placement = get(placementName);
              } catch (UnknownPlacementException e) {
                  continue;  // Placement must live in another data center.
              }
              placements.add(placement.getName());
          }
          return placements;
      }
docs: Returns all placements accessible in the local data center, including internal placements.