add refresh method to model packs

Author: michi42

pyjmad/modelpack.py

@@ -42,7 +42,7 @@ def _repo_from_uri(uri):
             repo = method.getName()
             jmad_default_repositories[repo] = _repo_to_uri(getattr(_JMadModelRepositories, repo)())
 except Exception:
-    logging.exception("can not fetch default models from jmad-modelpack-service")
+    logging.exception('can not fetch default models from jmad-modelpack-service')
 
 class JMadModelPackService(object):
     def __init__(self, applicationContext):
@@ -62,6 +62,11 @@ def modelpack_name(pkg):
         for name, variants in itertools.groupby(modelpacks, modelpack_name):
             self._modelpacks[name] = ModelPackType(self, name, variants)
 
+    def refresh(self):
+        logging.info('Clearing caches and reloading model packs ...')
+        self._javaService.clearCache().block()
+        self._reload()
+
     @property
     def repositories(self):
         return [_repo_to_uri(r) for r in self._javaRepositoryManager.enabledRepositories().collectList().block()]