only expose JythonMonitor if on Jython and _systemrestart is supported

1 files changed, 23 insertions, 22 deletions

diff --git a/paste/reloader.py b/paste/reloader.py
index 57915d5..67f704a 100644
--- a/paste/reloader.py
+++ b/paste/reloader.py
@@ -148,33 +148,34 @@ class Monitor(object):
 
     add_file_callback = classinstancemethod(add_file_callback)
 
-class JythonMonitor(Monitor):
+if sys.platform.startswith('java'):
+    try:
+        from _systemrestart import SystemRestart
+    except ImportError:
+        pass
+    else:
+        class JythonMonitor(Monitor):
 
-    """
-    Monitor that utilizes Jython's special
-    ``_systemrestart.SystemRestart`` exception.
+            """
+            Monitor that utilizes Jython's special
+            ``_systemrestart.SystemRestart`` exception.
 
-    When raised from the main thread it causes Jython to reload the
-    interpreter in the existing Java process (avoiding startup time).
+            When raised from the main thread it causes Jython to reload
+            the interpreter in the existing Java process (avoiding
+            startup time).
 
-    Note that this functionality of Jython is experimental and may
-    change in the future.
-    """
+            Note that this functionality of Jython is experimental and
+            may change in the future.
+            """
 
-    def __init__(self, *args, **kwargs):
-        Monitor.__init__(self, *args, **kwargs)
+            def __init__(self, *args, **kwargs):
+                Monitor.__init__(self, *args, **kwargs)
 
-    def periodic_reload(self):
-        while True:
-            if not self.check_reload():
-                raise SystemRestart()
-            time.sleep(self.poll_interval)
+            def periodic_reload(self):
+                while True:
+                    if not self.check_reload():
+                        raise SystemRestart()
+                    time.sleep(self.poll_interval)
 
-if sys.platform.startswith('java'):
-    try:
-        from _systemrestart import SystemRestart
-    except ImportError:
-        del JythonMonitor
-    
 watch_file = Monitor.watch_file
 add_file_callback = Monitor.add_file_callback