~~~
~~ ============LICENSE_START=======================================================
~~ ONAP : CCSDK
~~ ================================================================================
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~~ 						reserved.
~~ ================================================================================
~~ Licensed under the Apache License, Version 2.0 (the "License");
~~ you may not use this file except in compliance with the License.
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~~      http://www.apache.org/licenses/LICENSE-2.0
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~~ distributed under the License is distributed on an "AS IS" BASIS,
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~~~

      ---
      Service Logic Interpreter
      ---
      Dan Timoney
      ---
      2014-11-12
      ---

Supported node types

   The following built-in node types are currently supported:

     *  Flow Control

        *  {{{Block node}<<block>>}}

        *  {{{Call node}<<call>>}}

        *  {{{For node}<<for>>}}

        *  {{{Return node}<<return>>}}

        *  {{{Set node}<<set>>}}

        *  {{{Switch node}<<switch>>}}

     *  Device Management

        *  {{{Configure node}<<configure>>}}

     *  Java Plugin Support

        *  {{{Execute node}<<execute>>}}

     *  Recording

        *  {{{Record node}<<record>>}}

     *  Resource Management

        *  {{{Delete node}<<delete>>}}

        *  {{{Exists node}<<exists>>}}

        *  {{{Get-resource node}<<get-resource>>}}

        *  {{{Is-available node}<<is-available>>}}

        *  {{{Notify node}<<notify>>}}

        *  {{{Release node}<<release>>}}

        *  {{{Reserve node}<<reserve>>}}

        *  {{{Save node}<<save>>}}

        *  {{{Update node}<<update>>}}


* Flow Control

** Block node

*** Description

   A <<block>> node is used to executes a set of nodes.

*** Attributes

*--------------*--------------------------------------------+
| <<atomic>>   | if <true>, then if a node returns failure, subsequent nodes will not be executed and nodes already executed will be backed out.
*--------------*--------------------------------------------+

*** Parameters

  None

*** Outcomes

  None

*** Example

+-----------------+
<block>
  <record plugin="org.onap.ccsdk.sli.core.sli.recording.FileRecorder">
    <parameter name="file" value="/tmp/sample_r1.log" />
    <parameter name="field1" value="__TIMESTAMP__"/>
    <parameter name="field2" value="RESERVED"/>
    <parameter name="field3" value="$asePort.uni_circuit_id"/>
  </record>
  <return status="success">
    <parameter name="uni-circuit-id" value="$asePort.uni_circuit_id" />
  </return>
</block>
+-----------------+



**Call node

*** Description

  A <<call>> node is used to call another graph

*** Attributes

*--------------*-------+
| <<module>>   | Module of directed graph to call.  If unset, defaults to that of calling graph
*--------------*-------+
| <<rpc>>      | rpc of directed graph to call.
*--------------*-------+
| <<version>>  | version of graph to call,  If unset, uses active version.
*--------------*-------+
| <<mode>>     | mode (sync/async) of graph to call.   If unset, defaults to that of calling graph.
*--------------*-------+



*** Parameters

  Not applicable

*** Outcomes

*----------*---------+
| <<success>> | Sub graph returned success
*----------*---------+
| <<not-found>> | Graph not found
*----------*---------+
| <<failure>> | Subgraph returned success
*----------*---------+
   .

*** Example

+-------------------+
<call rpc="svc-topology-reserve" mode="sync" />
+-------------------+

**For node

*** Description

  A <<for>> node provides a fixed iteration looping mechanism, similar to the Java for loop

*** Attributes

*--------------*-------+
| <<index>>   | index variable
*--------------*-------+
| <<start>>    | initial value
*--------------*-------+
| <<end>>      | maximum value
*--------------*-------+


*** Parameters

  Not applicable.

*** Outcomes

  Not applicable.  The <<status>> node has no outcomes.

*** Example

+-------------------+
<for index="i" start="0" end="`$service-data.universal-cpe-ft.l2-switch-interfaces_length`">
   <record plugin="org.onap.ccsdk.sli.core.sli.recording.Slf4jRecorder">
      <parameter name="logger" value="message-log"/>
      <parameter name="level" value="info"/>
      <parameter name="field1" value="`'current l2-switch-interface name is ' + $service-data.universal-cpe-ft.l2-switch-interfaces[$i].name`"/>
   </record>
</for>
+-------------------+

**Return node

*** Description

  A <<return>> node is used to return a status to the invoking MD-SAL application

*** Attributes

*--------------*-------+
| <<status>>   | Status value to return (<success> or <failure>)
*--------------*-------+


*** Parameters

  The following optional parameters may be passed to convey more
  detailed status information.

*------------*-----------+
| <<error-code>> | A brief, usually numeric, code indicating the error condition
*------------*-----------+
| <<error-message>> | A more detailed error message
*------------*-----------+

*** Outcomes

  Not applicable.  The <<status>> node has no outcomes.

*** Example

+-------------------+
<return status="failure">
  <parameter name="error-code" value="1542" />
  <parameter name="error-message" value="Activation failure" />
</return>
+-------------------+

**Set node

*** Description

  A <<set>> node is used to set one or more values in the execution context

*** Attributes

*--------------*-------+
| <<only-if-unset>>   | If true the set node will only execute if the current value of the target is null
*--------------*-------+

*** Parameters

  Values to be set are passed as parameters

*** Outcomes

  Not applicable.  The <<set>> node has no outcomes.

*** Example

+-------------------+
<set>
  <parameter name="vlan" value="$network.provider-segmentation-id" />
</set>
+-------------------+

**Switch node

*** Description

  A <<switch>> node is used to make a decision based on its <<test>> attribute.

*** Attributes

*--------------*-------+
| <<test>>   | Condition to test
*--------------*-------+


*** Parameters

  None


*** Outcomes

  Depends on the <<test>> condition

*** Example

+-------------------+
<switch test="$uni-cir-units">
  <outcome value="Mbps">
    <reserve plugin="org.onap.ccsdk.sli.adaptors.samplesvc.SampleServiceResource"
             resource="ase-port"
             key="resource-emt-clli == $edge-device-clli and speed >= $uni-cir-value"
             pfx="asePort">

      <outcome value="success">
        <return status="success">
          <parameter name="uni-circuit-id" value="$asePort.uni_circuit_id" />
        </return>
      </outcome>
      <outcome value="Other">
        <return status="failure">
          <parameter name="error-code" value="1010" />
          <parameter name="error-message" value="No ports found that match criteria" />
        </return>
      </outcome>
    </reserve>
  </outcome>
  <outcome value="Gbps">
    <reserve plugin="org.onap.ccsdk.sli.adaptors.samplesvc.SampleServiceResource"
             resource="ase-port"
             key="resource-emt-clli == $edge-device-clli and speed >= $uni-cir-value*1000"
             pfx="asePort">

      <outcome value="success">
        <return status="success">
          <parameter name="uni-circuit-id" value="$asePort.uni_circuit_id" />
        </return>
      </outcome>
      <outcome value="Other">
        <return status="failure">
          <parameter name="error-code" value="1010" />
          <parameter name="error-message" value="No ports found that match criteria" />
        </return>
      </outcome>
    </reserve>
  </outcome>
</switch>
+-------------------+

* Device Management

**Configure node

*** Description

  A <<configure>> node is used to configure a device.

*** Attributes

*--------------*-------+
| <<adaptor>>   | Fully qualified Java class of resource adaptor to be used
*--------------*-------+
| <<activate>> | Activate device/interface, for devices that support a separate activation step.
*--------------*-------+
| <<key>>      | SQL-like string specifying criteria for item to configure
*--------------*-------+

*** Parameters

  Specific to device adaptor.

*** Outcomes

*-----------*-------+
| <<success>>  | Device successfully configured
*-----------*-------+
| <<not-found>> | Element to be configured does not exist.
*-----------*--------+
| <<not-ready>> | Element is not in a state where it can be configured/activated
*-----------*-------+
| <<already-active>> | Attempt to activate element that is already active
*-----------*-------+
| <<failure>> | Configure failed for some other reason
*-----------*-------+

*** Example

+-------------------+
<configure adaptor="org.onap.ccsdk.sli.adaptors.emt.EmtAdaptor"
           key="$uni-circuit-id" activate="true">
  <parameter name="circuit.id" value="$uni-circuit-id" />
  <parameter name="subscriber.name" value="$subscriber-name" />
  <parameter name="emt.clli" value="$edge-device-clli" />
  <parameter name="port.tagging" value="$port-tagging" />
  <parameter name="port.mediaSpeed" value="$media-speed" />
  <parameter name="location.state" value="$uni-location-state" />
  <parameter name="location.city" value="$uni-location-city" />
  <parameter name="cosCategory" value="$cos-category" />
  <parameter name="gosProfile" value="$gos-profile" />
  <parameter name="lldp" value="$asePort.resource-lldp" />
  <parameter name="mtu" value="$asePort.resource-mtu" />
  <outcome value="success">
    <block>
      <record plugin="org.onap.ccsdk.sli.core.sli.recording.FileRecorder">
        <parameter name="file" value="/tmp/sample_r1.log" />
        <parameter name="field1" value="__TIMESTAMP__"/>
        <parameter name="field2" value="ACTIVE"/>
        <parameter name="field3" value="$uni-circuit-id"/>
      </record>
      <return status="success">
        <parameter name="edge-device-clli" value="$asePort.resource-emt-clli" />
      </return>
    </block>
  </outcome>
  <outcome value="already-active">
    <return status="failure">
      <parameter name="error-code" value="1590" />
      <parameter name="error-message" value="Port already active" />
    </return>
  </outcome>
  <outcome value="Other">
    <return status="failure">
      <parameter name="error-code" value="1542" />
      <parameter name="error-message" value="Activation failure" />
    </return>
  </outcome>
</configure>
+-------------------+

* Java Plugin Support

**Execute node

*** Description

  An <<execute>> node is used to execute Java code supplied as a plugin

*** Attributes

*--------------*-------+
| <<plugin>>   | Fully qualified Java class of plugin to be used
*--------------*-------+
| <<method>> | Name of method in the plugin class to execute.  Method must return void, and take 2 arguments: a Map (for parameters) and a SvcLogicContext (to allow plugin read/write access to context memory)
*--------------*-------+

*** Parameters

  Specific to plugin / method

*** Outcomes

*-----------*-------+
| <<success>>  | Device successfully configured
*-----------*-------+
| <<not-found>> | Plugin class could not be loaded
*-----------*--------+
| <<unsupported-method>> | Named method taking (Map, SvcLogicContext) could not be found
*-----------*-------+
| <<failure>> | Configure failed for some other reason
*-----------*-------+

*** Example

+-------------------+
<execute plugin="org.onap.ccsdk.sli.plugins.HelloWorld"
           method="log">
  <parameter name="message" value="Hello, world!" />
  <outcome value="success">
      <return status="success"/>
  </outcome>
  <outcome value="not-found">
    <return status="failure">
      <parameter name="error-code" value="1590" />
      <parameter name="error-message" value="Could not locate plugin" />
    </return>
  </outcome>
  <outcome value="Other">
    <return status="failure">
      <parameter name="error-code" value="1542" />
      <parameter name="error-message" value="Internal error" />
    </return>
  </outcome>
</execute>
+-------------------+

* Recording

** Record node

*** Description

  A <<record>> node is used to record an event.  For example, this might be used
  to log provisioning events.

*** Attributes

*--------------*-------+
| <<plugin>>   | Fully qualified Java class to handle recording.
*--------------*-------+


*** Parameters

 Parameters will depend on the plugin being used.  For the FileRecorder class,
 the parameters are as follows

*------------*-----------+
| <<file>> | The file to which the record should be written
*------------*-----------+
| <<field1>> | First field to write.  There will be <<field>> parameters for each field to write, from <<field1>> through <<fieldN>>.  A special value __TIMESTAMP__ may be assigned to a field to insert the current timestamp
*------------*-----------+


*** Outcomes

*----------*---------+
| <<success>> | Record successfully written
*----------*---------+
| <<failure>> | Record could not be successfully written
*----------*---------+

*** Example

+-------------------+
<record plugin="org.onap.ccsdk.sli.core.sli.recording.FileRecorder">
  <parameter name="file" value="/tmp/sample_r1.log" />
  <parameter name="field1" value="__TIMESTAMP__"/>
  <parameter name="field2" value="ACTIVE"/>
  <parameter name="field3" value="$uni-circuit-id"/>
</record>
+-------------------+

* Resource Management

** Delete node

*** Description

  A <<delete>> node is used to delete a resource from the local resource inventory.

*** Attributes

*--------------*-------+
| <<plugin>>   | Fully qualified Java class of resource adaptor to be used
*--------------*-------+
| <<resource>> | Type of resource to delete
*--------------*-------+
| <<key>>      | SQL-like string specifying key to delete
*--------------*-------+

*** Parameters

  None

*** Outcomes

*-----------*-------+
| <<success>>  | Resource specified deleted successfully.
*-----------*-------+
| <failure>> | Resource specified was not deleted
*-----------*-------+

*** Example

+-------------------+
<delete plugin="org.onap.ccsdk.sli.adaptors.samplesvc.SampleServiceResource"
        resource="ase-port"
        key="uni_circuit_id == $uni-circuit-id">
  <outcome value="true">
    <return status="success"/>
  </outcome>
  <outcome value="false">
    <return status="failure"/>
  </outcome>
</delete>
+-------------------+


** Exists node

*** Description

  An <<exists>> node is used to determine whether a particular
  instance of a resource exists.  For example, this might be
  used to test whether a particular switch CLLI is provisioned.

*** Attributes

*--------------*-------+
| <<plugin>>   | Fully qualified Java class of resource adaptor to be used
*--------------*-------+
| <<resource>> | Type of resource to check
*--------------*-------+
| <<key>>      | SQL-like string specifying key to check for
*--------------*-------+

*** Parameters

  None

*** Outcomes

*-----------*-------+
| <<true>>  | Resource specified exists.
*-----------*-------+
| <<false>> | Resource specified is unknown
*-----------*-------+

*** Example

+-------------------+
<exists plugin="org.onap.ccsdk.sli.adaptors.samplesvc.SampleServiceResource"
        resource="ase-port"
        key="uni_circuit_id == $uni-circuit-id">
  <outcome value="true">
    <return status="success"/>
  </outcome>
  <outcome value="false">
    <return status="failure"/>
  </outcome>
</exists>
+-------------------+

** Get-resource node

*** Description

  A <<get-resource>> node is used to retrieve information about a
  particular resource and make it available to other nodes in the
  service logic tree.  For example, this might be used to
  retrieve information about a particular uni-port.

*** Attributes

*--------------*-------+
| <<plugin>>   | Fully qualified Java class of resource adaptor to be used
*--------------*-------+
| <<resource>> | Type of resource to retrieve
*--------------*-------+
| <<key>>      | SQL-like string specifying criteria for retrieval
*--------------*-------+
| <<pfx>>      | Prefix to add to context variable names set for data retrieved
*--------------*-------+
| <<select>>      | String to specify, if key matches multiple entries, which entry should take precedence
*--------------*-------+
| <<order-by>>      | Prefix to add to context variable names set for data retrieved
*--------------*-------+

*** Parameters

  None


*** Outcomes

*-----------*-------+
| <<success>>  | Resource successfully retrieved
*-----------*-------+
| <<not-found>> | Resource referenced does not exist
*-----------*-------+
| <<failure>> | Resource retrieve failed for some other reason
*-----------*-------+

*** Example

+-------------------+
<get-resource plugin="org.onap.ccsdk.sli.adaptors.samplesvc.SampleServiceResource"
              resource="ase-port"
              key="uni_circuit_id == $uni-circuit-id"
              pfx="current-port">
  <outcome value="success">
    <return status="success"/>
  </outcome>
  <outcome value="not-found">
    <return status="failure"/>
  </outcome>
  <outcome value="failure">
    <return status="failure"/>
  </outcome>
</get-resource>
+-------------------+

** Is-available node

*** Description

  An <<is-available>> node is used to determine whether a particular
  type of resource is available.  For example, this might be used to
  test whether any ports are available for assignment on a particular switch.

*** Attributes

*--------------*-------+
| <<plugin>>   | Fully qualified Java class of resource adaptor to be used
*--------------*-------+
| <<resource>> | Type of resource to check
*--------------*-------+
| <<key>>      | SQL-like string specifying key to check for
*--------------*-------+
| <<pfx>>      | Prefix to add to context variable names set for data retrieved
*--------------*-------+

*** Parameters

  None

*** Outcomes

*-----------*-------+
| <<true>>  | Resource requested is available
*-----------*-------+
| <<false>> | Resource requested is not available
*-----------*-------+

*** Example

+-------------------+
<is-available plugin="org.onap.ccsdk.sli.adaptors.samplesvc.SampleServiceResource"
              resource="ase-port"
              key="resource-emt-clli == $edge-device-clli and speed >= $uni-cir-value">
  <outcome value="true">
    <return status="success"/>
  </outcome>
  <outcome value="false">
    <return status="failure"/>
  </outcome>
</is-available>
+-------------------+

** Notify node

*** Description

  A <<notify>> node is used to inform an external application (e.g. A&AI) that a resource was
  updated.

*** Attributes

*--------------*-------+
| <<plugin>>   | Fully qualified Java class of resource adaptor to be used
*--------------*-------+
| <<resource>> | Identifies resource that was updated
*--------------*-------+
| <<action>>      | Action that triggered notification to be sent (ADD/UPDATE/DELETE)
*--------------*-------+

*** Parameters

  None

*** Outcomes

*-----------*-------+
| <<success>>  | Notification was successful
*-----------*-------+
| <<failure>> | Notification failed is not available
*-----------*-------+

*** Example

+-------------------+
<notify plugin="org.onap.ccsdk.sli.adaptors.samplesvc.SampleServiceResource"
              resource="ase-port"
              action="ADD">
  <outcome value="success">
    <return status="success"/>
  </outcome>
  <outcome value="Other">
    <return status="failure"/>
  </outcome>
</notify>
+-------------------+

** Release node

*** Description

  A <<release>> node is used to mark a resource as no longer in use, and thus
  available for assignment.

*** Attributes

*--------------*-------+
| <<plugin>>   | Fully qualified Java class of resource adaptor to be used
*--------------*-------+
| <<resource>> | Type of resource to release
*--------------*-------+
| <<key>>      | SQL-like string specifying key to check of resource to release
*--------------*-------+

*** Parameters

  None

*** Outcomes

*-----------*-------+
| <<success>>  | Resource successfully released
*-----------*-------+
| <<not-found>> | Resource referenced does not exist
*-----------*-------+
| <<failure>> | Resource release failed for some other reason
*-----------*-------+

*** Example

+-------------------+
<release plugin="org.onap.ccsdk.sli.adaptors.SampleServiceResource"
         resource="ase-port"
         key="uni_circuit_id == $uni-circuit-id">
  <outcome value="success">
    <return status="success"/>
  </outcome>
  <outcome value="not-found">
    <return status="failure"/>
  </outcome>
  <outcome value="failure">
    <return status="failure"/>
  </outcome>
</release>
+-------------------+


** Reserve node

*** Description

  A <<reserve>> node is used to reserve a particular
  type of resource..  For example, this might be used to
  reserve a port on a particular switch.

*** Attributes

*--------------*-------+
| <<plugin>>   | Fully qualified Java class of resource adaptor to be used
*--------------*-------+
| <<resource>> | Type of resource to reserve
*--------------*-------+
| <<key>>      | SQL-like string specifying criteria for reservation
*--------------*-------+
| <<select>>   | String to specify, if <<key>> matches multiple entries, which entry should take precedence
*--------------*-------+

*** Parameters

  None

*** Outcomes

*-----------*-------+
| <<success>>  | Resource requested was successfully reserved
*-----------*-------+
| <<failure>> | Resource requested was not successfully reserved
*-----------*-------+

*** Example

+-------------------+
<reserve plugin="org.onap.ccsdk.sli.adaptors.samplesvc.SampleServiceResource"
         resource="ase-port"
         key="resource-emt-clli == $edge-device-clli and speed >= $uni-cir-value"
         select="min(speed)">
  <outcome value="success">
    <return status="success"/>
  </outcome>
  <outcome value="failure">
    <return status="failure"/>
  </outcome>
</reserve>
+-------------------+

** Save node

*** Description

  A <<save>> node is used to save information about a
  particular resource to persistent storage.  For example, this might be used to
  save information about a particular uni-port.

*** Attributes

*--------------*-------+
| <<plugin>>   | Fully qualified Java class of resource adaptor to be used
*--------------*-------+
| <<resource>> | Type of resource to save
*--------------*-------+
| <<key>>      | SQL-like string specifying criteria for retrieval
*--------------*-------+
| <<force>>    | If "true", save resource even if this resource is already stored in persistent storage
*--------------*-------+
| <<pfx>>      | Prefix to be prepended to variable names, when attributes are set in SvcLogicContext
*--------------*-------+

*** Parameters

  Values to save (columns) are specified as parameters, with each name
  corresponding to a column name and each value corresponding to the
  value to set.

*** Outcomes

*-----------*-------+
| <<success>>  | Resource successfully saved
*-----------*-------+
| <<failure>> | Resource save failed
*-----------*-------+

*** Example

+-------------------+
<save plugin="`$sample-resource-plugin`" resource="vnf"
    key="vnf-name = $requests.vnf.vnf-name" force="true"
    pfx="requests.vnf">
    <parameter name="vnf-name"
        value="`$requests.cust-country-code + $requests.cust-id + $requests.cust-city + $requests.cust-state + '001VCE'`" />
    <parameter name="vnf-type" value="vce" />
    <parameter name="orchestration-status" value="pending-create" />
    <parameter name="heat-stack-id" value="`$requests.heat-stack-id`" />
    <parameter name="mso-catalog-key" value="`$requests.mso-catalog-key`" />
    <parameter name="oam-ipv4-address" value="`$vce-ipv4-oam-addr.ipv4-addr`" />
</save>
+-------------------+

** Update node

*** Description

  An <<update>> node is used to update information about a
  particular resource to persistent storage.

*** Attributes

*--------------*-------+
| <<plugin>>   | Fully qualified Java class of resource adaptor to be used
*--------------*-------+
| <<resource>> | Type of resource to update
*--------------*-------+
| <<key>>      | SQL-like string specifying criteria for retrieval
*--------------*-------+
| <<pfx>>      | Prefix to be prepended to variable names, when attributes are set in SvcLogicContext
*--------------*-------+

*** Parameters

  Values to save (columns) are specified as parameters, with each name
  corresponding to a column name and each value corresponding to the
  value to set.

*** Outcomes

*-----------*-------+
| <<success>>  | Resource successfully saved
*-----------*-------+
| <<failure>> | Resource save failed
*-----------*-------+

*** Example

+-------------------+
<update plugin="`$sample-resource-plugin`" resource="vnf"
    key="vnf-name = $requests.vnf.vnf-name"
    pfx="requests.vnf">
    <parameter name="vnf-name"
        value="`$requests.cust-country-code + $requests.cust-id + $requests.cust-city + $requests.cust-state + '001VCE'`" />
    <parameter name="vnf-type" value="vce" />
    <parameter name="orchestration-status" value="pending-create" />
    <parameter name="heat-stack-id" value="`$requests.heat-stack-id`" />
    <parameter name="mso-catalog-key" value="`$requests.mso-catalog-key`" />
    <parameter name="oam-ipv4-address" value="`$vce-ipv4-oam-addr.ipv4-addr`" />
</update>
+-------------------+