Cleaning up and enhancing driver subsystem and the flow objective subsystem.

Change-Id: Ica600ef1aaa46d19e764cd7a197454a4e0f85a08
diff --git a/core/api/src/main/java/org/onosproject/net/behaviour/PipelinerContext.java b/core/api/src/main/java/org/onosproject/net/behaviour/PipelinerContext.java
new file mode 100644
index 0000000..c2c6dfd
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/behaviour/PipelinerContext.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.net.behaviour;
+
+import org.onlab.osgi.ServiceDirectory;
+
+/**
+ * Processing context and supporting services for the pipeline behaviour.
+ */
+public interface PipelinerContext {
+
+    /**
+     * Returns the service directory which can be used to obtain references
+     * to various supporting services.
+     *
+     * @return service directory
+     */
+    ServiceDirectory directory();
+
+    // TODO: add means to store and access shared state
+}