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-rw-r--r--docs/pap/images/PolicyImplPDPSubGroup.svg2
-rw-r--r--docs/pap/pap.rst58
2 files changed, 60 insertions, 0 deletions
diff --git a/docs/pap/images/PolicyImplPDPSubGroup.svg b/docs/pap/images/PolicyImplPDPSubGroup.svg
new file mode 100644
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+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
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font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; width: 82px; white-space: nowrap; overflow-wrap: normal; text-align: center;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">PDPSubGroup</div></div></foreignObject><text x="41" y="12" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">PDPSubGroup</text></switch></g><rect x="200" y="260" width="60" height="30" fill="#fff2cc" stroke="#d6b656" pointer-events="none"/><g transform="translate(210.5,268.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="38" height="12" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; width: 39px; white-space: nowrap; overflow-wrap: normal; text-align: center;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">PDP-D</div></div></foreignObject><text x="19" y="12" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">PDP-D</text></switch></g><rect x="190" y="250" width="60" height="30" fill="#fff2cc" stroke="#d6b656" pointer-events="none"/><g transform="translate(200.5,258.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="38" height="12" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; width: 39px; white-space: nowrap; overflow-wrap: normal; text-align: center;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">PDP-D</div></div></foreignObject><text x="19" y="12" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">PDP-D</text></switch></g><rect x="180" y="240" width="60" height="30" fill="#fff2cc" stroke="#d6b656" pointer-events="none"/><g transform="translate(190.5,248.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="38" height="12" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; width: 39px; white-space: nowrap; overflow-wrap: normal; text-align: center;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">PDP-D</div></div></foreignObject><text x="19" y="12" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">PDP-D</text></switch></g><path d="M 310 95 L 426 95 L 440 109 L 440 145 L 310 145 L 310 95 Z" fill="#d5e8d4" stroke="#82b366" stroke-miterlimit="10" pointer-events="none"/><path d="M 426 95 L 426 109 L 440 109" fill="none" stroke="#82b366" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(312.5,96.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="126" height="41" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; width: 126px; white-space: normal; overflow-wrap: normal;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">All PDPs in a <i>PDPSubGroup</i> run the same <i>PolicyImpl</i></div></div></foreignObject><text x="63" y="27" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">[Not supported by viewer]</text></switch></g><path d="M 270 145 L 310 120" fill="none" stroke="#97d077" stroke-miterlimit="10" stroke-dasharray="3 3" pointer-events="none"/><path d="M 120 243 L 180 255" fill="none" stroke="#97d077" stroke-miterlimit="10" stroke-dasharray="3 3" pointer-events="none"/><path d="M 320 195 L 426 195 L 440 209 L 440 245 L 320 245 L 320 195 Z" fill="#d5e8d4" stroke="#82b366" stroke-miterlimit="10" pointer-events="none"/><path d="M 426 195 L 426 209 L 440 209" fill="none" stroke="#82b366" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(322.5,196.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="116" height="41" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; width: 116px; white-space: normal; overflow-wrap: normal;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">The PDP running its<i> PolicyImpl</i> is the unit of scaling</div></div></foreignObject><text x="58" y="27" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">[Not supported by viewer]</text></switch></g><path d="M 240 263 L 320 220" fill="none" stroke="#97d077" stroke-miterlimit="10" stroke-dasharray="3 3" pointer-events="none"/><path d="M 0 97.5 L 122 97.5 L 130 105.5 L 130 152.5 L 0 152.5 L 0 97.5 Z" fill="#d5e8d4" stroke="#82b366" stroke-miterlimit="10" pointer-events="none"/><path d="M 122 97.5 L 122 105.5 L 130 105.5" fill="none" stroke="#82b366" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(2.5,99.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="126" height="41" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; width: 126px; white-space: normal; overflow-wrap: normal;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">A <i>PDPSubGroup</i> is a Kubernetes <b><i>Deployment</i></b></div></div></foreignObject><text x="63" y="27" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">[Not supported by viewer]</text></switch></g><path d="M 170 145 L 130 125" fill="none" stroke="#97d077" stroke-miterlimit="10" stroke-dasharray="3 3" pointer-events="none"/><path d="M 0 220 L 106 220 L 120 234 L 120 265 L 0 265 L 0 220 Z" fill="#d5e8d4" stroke="#82b366" stroke-miterlimit="10" pointer-events="none"/><path d="M 106 220 L 106 234 L 120 234" fill="none" stroke="#82b366" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(2.5,221.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="116" height="27" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; vertical-align: top; width: 116px; white-space: normal; overflow-wrap: normal;"><div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;">PDPs run as Kubernets <b><i>Pods</i></b><i><br /></i></div></div></foreignObject><text x="58" y="20" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">[Not supported by viewer]</text></switch></g><path d="M 155 0 L 281 0 L 285 4 L 285 50 L 155 50 L 155 0 Z" fill="#d5e8d4" stroke="#82b366" stroke-miterlimit="10" pointer-events="none"/><path d="M 281 0 L 281 4 L 285 4" fill="none" stroke="#82b366" stroke-miterlimit="10" pointer-events="none"/><g transform="translate(157.5,1.5)"><switch><foreignObject style="overflow:visible;" pointer-events="all" width="126" height="41" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; 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diff --git a/docs/pap/pap.rst b/docs/pap/pap.rst
index 964712e6..ff6aac51 100644
--- a/docs/pap/pap.rst
+++ b/docs/pap/pap.rst
@@ -21,6 +21,64 @@ PDP group to arbitrarily appear and disappear and for policy consistency across
maintained. The PAP is responsible for controlling the state across the PDPs in a PDP group. The PAP interacts with the
policy database and transfers policies to PDPs.
+The unit of execution and scaling in the Policy Framework is a *PolicyImpl* entity. A *PolicyImpl* entity runs on a PDP.
+As is explained above, a *PolicyImpl* entity is a *PolicyTypeImpl* implementation parameterized with a TOSCA *Policy*.
+
+.. image:: images/PolicyImplPDPSubGroup.svg
+
+In order to achieve horizontal scalability, we group the PDPs running instances of a given *PolicyImpl* entity logically
+together into a *PDPSubGroup*. The number of PDPs in a *PDPSubGroup* can then be scaled up and down using Kubernetes. In
+other words, all PDPs in a subgroup run the same *PolicyImpl*, that is the same policy template implementation (in
+XACML, Drools, or APEX) with the same parameters.
+
+The figure above shows the layout of *PDPGroup* and *PDPSubGroup* entities. The figure shows examples of PDP groups for
+Control Loop and Monitoring policies on the right.
+
+The health of PDPs is monitored by the PAP in order to alert operations teams managing policies. The PAP manages the life
+cycle of policies running on PDPs.
+
+The table below shows the deployment methods in which *PolicyImpl* entities can be deployed to PDP Subgroups.
+
+========== =========================================== ============================== ==================================
+**Method** **Description** **Advantages** **Disadvantages**
+========== =========================================== ============================== ==================================
+Cold The *PolicyImpl* (*PolicyTypeImpl* and No run time configuration Very restrictive, no run time
+ TOSCA *Policy*) are predeployed on the PDP. required and run time configuration of PDPs is possible.
+ PDP is fully configured and ready to administration is simple.
+ execute when started.
+
+ PDPs register with the PAP when they
+ start, providing the *pdpGroup* they
+ have been preconfigured with.
+
+Warm The *PolicyTypeImpl* entity is predeployed The configuration, parameters, Administration and management is
+ on the PDP. A TOSCA *Policy* may be loaded and PDP group of PDPs may be required. The configuration and
+ at startup. The PDP may be configured or changed at run time by loading life cycle of the TOSCA policies
+ reconfigured with a new or updated TOSCA or updating a TOSCA *Policy* can change at run time and must be
+ *Policy* at run time. into the PDP. administered and managed.
+
+ PDPs register with the PAP when they start, Support TOSCA *Policy* entity
+ providing the *pdpGroup* they have been life cycle managgement is
+ predeployed with if any. The PAP may update supported, allowing features
+ the TOSCA *Policy* on a PDP at any time such as *PolicyImpl* Safe Mode
+ after registration. and *PolicyImpl* retirement.
+
+Hot The *PolicyImpl* (*PolicyTypeImpl* and The policy logic, rules, Administration and management is
+ TOSCA *Policy*) are deployed at run time. configuration, parameters, and more complex. The *PolicyImpl*
+ The *PolicyImpl* (*PolicyTypeImpl* and PDP group of PDPs may be itself and its configuration and
+ TOSCA *Policy*) may be loaded at startup. changed at run time by loading life cycle as well as the life
+ The PDP may be configured or reconfigured or updating a TOSCA *Policy* cycle of the TOSCA policies can
+ with a new or updated *PolicyTypeImpl* and *PolicyTypeImpl* into the change at run time and must be
+ and/or TOSCA *Policy* at run time. PDP. administered and managed.
+
+ PDPs register with the PAP when they Lifecycle management of TOSCA
+ start, providing the *pdpGroup* they have *Policy* entities and
+ been preconfigured with if any. The PAP may *PolicyTypeImpl* entites is
+ update the TOSCA *Policy* and supported, allowing features
+ *PolicyTypeImpl* on a PDP at any time after such as *PolicyImpl* Safe Mode
+ registration and *PolicyImpl* retirement.
+========== =========================================== ============================== ==================================
+
1 APIs
======