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Overview

  • By each LCM state change the related notification is sent to user to notify about the state change
  • When an event is registered it will be in ADVISED state
  • Only the handles with ADVISED state will be picked up by a watchdog

Diagram of the possible transactions between CM-Handle states

CPS-799 Spike: Define states and state handling for CM handle

Notification details

Notification handling in code

draw.io

Diagram attachment access error: cannot display diagram

The Event structure of the notification

Event schema

LcmEvent Scema 
{

  "$schema": "https://json-schema.org/draft/2019-09/schema",
  "$id": "urn:cps:org.onap.ncmp.cmhandle.lcm-event:v1",

  "$ref": "#/definitions/LcmEvent",

  "definitions": {

    "Values": {
      "description": "Values that represents the state of a cmHandle",
      "type": "object",
      "properties": {
        "dataSyncEnabled":{
          "description": "Whether data sync enabled",
          "type": "boolean"
        },
        "cmHandleState": {
          "description": "State of cmHandle",
          "type": "string",
          "enum": ["ADVISED", "READY", "LOCKED", "DELETING", "DELETED"]
        },
        "cmHandleProperties": {
          "description": "cmHandle properties",
          "type": "object",
          "default": null,
          "existingJavaType": "java.util.List<java.util.Map<String,String>>",
          "additionalProperties": false
        }
      },
      "additionalProperties": false
    },

    "Event": {
      "description": "The Payload of an event",
      "type": "object",
      "properties": {
        "cmHandleId": {
          "description": "cmHandle id",
          "type": "string"
        },
        "oldValues": {
          "$ref": "#/definitions/Values"
        },
        "newValues": {
          "$ref": "#/definitions/Values"
        }
      },
      "required": [
        "cmHandleId"
      ],
      "additionalProperties": false
    },

    "LcmEvent": {
      "description": "The payload for LCM event",
      "type": "object",
      "javaType" : "org.onap.ncmp.cmhandle.event.lcm.LcmEvent",
      "properties": {
        "eventId": {
          "description": "The unique id identifying the event",
          "type": "string"
        },
        "eventCorrelationId": {
          "description": "The id identifying the event",
          "type": "string"
        },
        "eventTime": {
          "description": "The timestamp when original event occurred",
          "type": "string"
        },
        "eventSource": {
          "description": "The source of the event",
          "type": "string"
        },
        "eventType": {
          "description": "The type of the event",
          "type": "string"
        },
        "eventSchema": {
          "description": "The schema that this event adheres to",
          "type": "string"
        },
        "eventSchemaVersion": {
          "description": "The version of the schema that this event adheres to",
          "type": "string"
        },
        "event": {
          "$ref": "#/definitions/Event"
        }
      },
      "required": [
        "eventId",
        "eventCorrelationId",
        "eventTime",
        "eventSource",
        "eventType",
        "eventSchema",
        "eventSchemaVersion",
        "event"
      ],
      "additionalProperties": false
    }

  }
}


Event examples

CPS-1104 Agree LCM Event schemas

Create Event 
{
  "eventId"               : "00001",    
  "eventCorrelationId     : "cmhandle-001"      
  "eventTime"             : "2021-11-16T16:42:25-04:00",
  "eventSource"           : "org.onap.ncmp",                                 
  "eventType"             : "org.onap.ncmp.cmhandle-lcm-event.create",   
  ”eventSchema”           : “org.onap.ncmp:cmhandle-lcm-event",  
  "eventSchemaVersion"    : "1.0" 

  "event": {
         “cmHandleId” : “cmhandle-001”,
         "newValues" : {                      # include ALL cmhandle metadata attributes in newValues section
             “cmHandleState”  : “ADVISED”, 
             “dataSyncEnabled” : “TRUE”,
             “cmhandleProperties” : [
                          “someProperty-1” : “Initial property value 1”,
                          “someProperty-2” : “Initial property value 2”
                   ]
         }   
    }
}
Update Event 
{
  "eventId"                : "00001",    
  "eventCorrelationId      : "cmhandle-001"      
  "eventTime"              : "2021-11-16T16:42:25-04:00",
  "eventSource"            : "org.onap.ncmp",                                 
  "eventType"              : "org.onap.ncmp.cmhandle-lcm-event.update",   
  ”eventSchema”            : “org.onap.ncmp:cmhandle-lcm-event", 
  "eventSchemaVersion"    : "1.0"  
  
  "event": {
         “cmHandleId” : “cmhandle-001”
         "oldValues" : {
    			 “cmHandleState”  : “ADVISED”,
                 “dataSyncEnabled” : “FALSE”, 
                 “cmhandleProperties” : [
                          “someProperty-0” : “ This property will be updated”,
                          “someProperty-1” : “ This property will be deleted”,
              }
          "newValues" : {
	    	 “cmHandleState”  : “READY”,
             “dataSyncEnabled” : “TRUE”,  
             “cmhandleProperties” : [
                          “someProperty-0” : “ This property has been updated”,
                          “someProperty-2” : “ This property is newly added to the cmhandle”
                   ]
           }   
       ]
    }
}
Delete Event 
{
  "eventId"                : "00001",    
  "eventCorrelationId      : "cmhandle-001",       
  "eventTime"              : "2021-11-16T16:42:25-04:00",
  "eventSource"            : "org.onap.ncmp",                                 
  "eventType"              : "org.onap.ncmp.cmhandle-lcm-event.delete",   
  ”eventSchema”            : “org.onap.ncmp:cmhandle-lcm-event",  
  "eventSchemaVersion"    : "1.0"   
     
  "event": {
        “cmHandleId” : “cmhandle-001”    
  }
}

Typical use cases which leads to state changes and trigger notification events

State changes after new Handle is registered

State change use case diagram

State changes after Handle update received

Cm handle state changes after update

State changes happens during watchdog execution

State changes in watchdog

Source materials

Important links to related Spikes and Implementation proposals
(From latest to older ones)

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