add callback timeouts, secondary thread pools, and frame directives to Router

tests/test_router.py

@@ -1,6 +1,7 @@
 import logging
 from pathlib import Path
 from functools import partial
+from concurrent.futures import wait
 
 from execlog import util
 from execlog import ChainRouter, Event
@@ -41,7 +42,7 @@ def test_single_router_submission():
         Event(endpoint='endpoint_proxy', name='file3'),
     ]
     futures = router2.submit(events)
-    router2.wait_on_futures(futures)
+    wait(futures)
     
     assert True
 
@@ -52,7 +53,7 @@ def test_chain_router_submission():
         Event(endpoint='endpoint_proxy', name='file3'),
     ]
     futures = chain_router.submit(events)
-    chain_router.wait_on_futures(futures)
+    wait(futures)
 
     assert True
 

tests/test_server.py

@@ -94,7 +94,8 @@ def test_server_with_listeners():
     server.shutdown()
     thread.join()
 
-    # finally check the router event logs
-    assert router1.event_log[0][1] == ['router1 job success']
-    assert router2.event_log[0][1] == ['router2 job success']
+    # finally check the router event logs: holds tier-I futures, which hold lists of
+    # tier-II futures
+    assert [r.result() for r in router1.event_log[0][1].result()] == ['router1 job success']
+    assert [r.result() for r in router2.event_log[0][1].result()] == ['router2 job success']