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@@ -6,3 +6,66 @@
Policy Control Loop Coordination - POC
**************************************
+.. contents::
+ :depth: 3
+
+
+What is the Control Loop Coordinator?
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+The Control Loop Coordinator (CLC) is a facility embedded within Policy that provides:
+
+* Abstractions enabling an operator to specify how ONAP/ECOMP will coordinate the interactions between a given pair of Control Loop Functions (CLFs);
+* Mechanisms to ensure coordination directives are correctly enforced by ONAP/ECOMP at run-time.
+
+
+How does the CLC work?
+^^^^^^^^^^^^^^^^^^^^^^
+
+The table below illustrates conflict between two CLFs at the functional and architectural views and resolution of that conflict via introduction of the CLC.
+
++-----------+-------------------------+-----------------------+
+| Scenario | Functional View | Architectural View |
++===========+=========================+=======================+
+| Conflict | .. image:: func.PNG | .. image:: arch.PNG |
+| | :scale: 33 | :scale: 33 |
++-----------+-------------------------+-----------------------+
+| Resolution| .. image:: clcf.PNG | .. image:: clca.PNG |
+| | :scale: 33 | :scale: 33 |
++-----------+-------------------------+-----------------------+
+
+
+How is the CLC implemented?
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ .. _template.demo.clc: https://git.onap.org/policy/drools-applications/tree/controlloop/templates/template.demo.clc
+
+ .. _synthetic_control_loop_one_blocks_synthetic_control_loop_two.xml: https://git.onap.org/policy/drools-applications/tree/controlloop/templates/template.demo.clc/src/test/resources/xacml/synthetic_control_loop_one_blocks_synthetic_control_loop_two.xml
+
+ .. _policy_ControlLoop_SyntheticOne.yaml: https://git.onap.org/policy/drools-applications/tree/controlloop/templates/template.demo.clc/src/test/resources/yaml/policy_ControlLoop_SyntheticOne.yaml
+
+ .. _policy_ControlLoop_SyntheticTwo.yaml: https://git.onap.org/policy/drools-applications/tree/controlloop/templates/template.demo.clc/src/test/resources/yaml/policy_ControlLoop_SyntheticTwo.yaml
+
+ .. _xacml_guard_clc.properties: https://git.onap.org/policy/drools-applications/tree/controlloop/templates/template.demo.clc/src/test/resources/xacml/xacml_guard_clc.properties
+
+ .. _ControlLoopEventManager: https://git.onap.org/policy/drools-applications/tree/controlloop/templates/template.demo.clc/src/main/resources/__closedLoopControlName__.drl#n210
+
+Example code is provided at `template.demo.clc`_. The abstraction implemented for the initial release is simply a XACML policy (e.g., `synthetic_control_loop_one_blocks_synthetic_control_loop_two.xml`_) that matches against one CLF (e.g., `policy_ControlLoop_SyntheticOne.yaml`_) and checks the status of another CLF (e.g., `policy_ControlLoop_SyntheticTwo.yaml`_) via provided PIPs. The following release will provide a much more succinct YAML representation consisting of coordination_directive_type, control_loop_one_id, control_loop_two_id, and, optionally, one or more parameters, the semantics of which are defined by the coordination_directive_type.
+
+
+How do you run the example?
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+From within `template.demo.clc`_ run
+
+ .. code-block:: bash
+
+ $ mvn test -Dtest=ControlLoopCoordinationTest
+
+**NOTE:** When incorporating this example code into your own application, the XACML policies implementing the coordination directives must be included in the XACML .properties file used by the ONAP/ECOMP controller instance (e.g., `xacml_guard_clc.properties`_). The CLF’s drl file must also contain the following modification, to be included after the creation of the `ControlLoopEventManager`_.
+
+ .. code-block:: bash
+
+ // Disable target locking
+ //
+ manager.setUseTargetLock(false);
+
+
+End of Document
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