Additions to support HAAlchemy plugin

- add a connect=True key to connection record to support
  pre-loading of _ConnectionRecord objects
- ensure _ConnectionRecord.close() leaves the record in a good
  state for reopening
- add _ConnectionRecord.record_info for persistent storage
- add "in_use" accessor based on fairy_ref being present or not
- allow for the exclusions system and SuiteRequirements to be
  usable without the full plugin_base setup.
- move some Python-env requirements to the importable
  requirements.py module.
- allow starttime to be queried
- add additional events for engine plugins
- have "dialect" be a first-class parameter to the pool,
  ensure the engine strategy supplies it up front

Change-Id: Ibf549f7a1766e49d335cd6f5e26bacfaef9a8229

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/sqlalchemy/engine/interfaces.py b/lib/sqlalchemy/engine/interfaces.py
index 13e8bf1f4..082661216 100644
--- a/lib/sqlalchemy/engine/interfaces.py
+++ b/lib/sqlalchemy/engine/interfaces.py
@@ -900,6 +900,12 @@ class CreateEnginePlugin(object):
         """
         self.url = url
 
+    def handle_dialect_kwargs(self, dialect_cls, dialect_args):
+        """parse and modify dialect kwargs"""
+
+    def handle_pool_kwargs(self, pool_cls, pool_args):
+        """parse and modify pool kwargs"""
+
     def engine_created(self, engine):
         """Receive the :class:`.Engine` object when it is fully constructed.