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References

Example from documentation

UML diagram for example edge rule

ExampleEquivalent Example
Example Edge Rule 
{
“from”: “tenant”,
“to”: “vserver”,
“label”: “owns”,
“direction”: “OUT”,
“multiplicity”: “One2Many”,
“contains-other-v”: “${direction}”,
“delete-other-v”: “NONE”,
“SVC-INFRA”: “!${direction}”,
“prevent-delete”: “${direction}”
}
Equivalent Edge Rule 
{
“from”: “vserver”,
“to”: “tenant”,
“label”: “owns”,
“direction”: “IN”,
“multiplicity”: “One2Many”,
“contains-other-v”: “!${direction}”,
“delete-other-v”: “NONE”,
“SVC-INFRA”: “${direction}”,
“prevent-delete”: “!${direction}”
}
How to read in/out/direction 
How to read "from"/"to" and "direction" in this case:
- the "in" node is "vserver"
- the "out" node is "tenant"
How to read the label 
How to read the "label" in this case:
- ("out" node) "label" ("in" node)

i.e. tenant "owns" vserver
How to read multiplicity 
How to read "multiplicity" in this case:
- ("in" node) cardinality is "one"
- ("out" node) cardinality is "many"

i.e.
Each "tenant" has one "vserver"
Each "vserver" has many "tenants"
How to read contains-other-v 
How to read "contains-other-v" in this case:
- fetching data for ("out" node) includes data for ("in" node)

i.e. fetching data for "tenant" includes data for "vserver"
How to read delete-other-v 
How to read "delete-other-v" in this case:
- delete of ("out" node) includes does nothing to ("in" node)

i.e. delete of "tenant" includes does nothing to "vserver"
How to read SVC-INFRA 
How to read "SVC-INFRA" in this case:
- when running edge-tag-query on ("in" node) traverse to ("out" node) and continue

i.e.
when running edge-tag-query on "vserver" traverse to "tenant" and continue
How to read prevent-delete 
How to read "prevent-delete" in this case:
- prevent delete of ("out" node) when related to ("in" node), allow delete of ("in" node)

i.e.
prevent delete of "tenant" when related to "vserver", allow delete of "vserver"


General Applicability

  • EdgeRules only apply to "relationship-list" relations in the schema, since the referenced object could be anything
  • EdgeRules do not apply to sub-component relations in the schema, since this is implicit and hard-coded behaviour


FieldValuesNotes
from

(literal string as entered in EdgeRule file)


Expected to match the "name" value of "xml-root-element" in OXM file.

Note that the "from|to" pair is normalised in the code according to alphabetical order, so that "cousin pairs" with the "to|from" ordering in the EdgeRule are also grouped together, e.g.

  • from "l-interface" to "logical-link" → "l-interface|logical-link"
  • from "logical-link" to "l-interface" → "l-interface|logical-link"

Also note that the hyphens "-" are removed from the names before comparison, so the following would be equivalent:

  • l-interface
  • linter-face
to

(literal string as entered in EdgeRule file)


Expected to match the "name" value of "xml-root-element" in OXM file.

Note that the "from|to" pair is normalised in the code according to alphabetical order, so that "cousin pairs" with the "to|from" ordering in the EdgeRule are also grouped together, e.g.

  • from "l-interface" to "logical-link" → "l-interface|logical-link"
  • from "logical-link" to "l-interface" → "l-interface|logical-link"

Also note that the hyphens "-" are removed from the names before comparison, so the following would be equivalent:

  • l-interface
  • linter-face
label

(literal string as entered in EdgeRule file)


By convention, appears to be one of:

  • isA

  • org.onap.relationships.inventory.AppliesTo

  • org.onap.relationships.inventory.BelongsTo

  • org.onap.relationships.inventory.BridgedTo

  • org.onap.relationships.inventory.ComposedOf

  • org.onap.relationships.inventory.DependsOn

  • org.onap.relationships.inventory.Destination

  • org.onap.relationships.inventory.ForwardsTo

  • org.onap.relationships.inventory.IsA

  • org.onap.relationships.inventory.LocatedIn

  • org.onap.relationships.inventory.MemberOf

  • org.onap.relationships.inventory.network.MemberOf

  • org.onap.relationships.inventory.PartOf

  • org.onap.relationships.inventory.Source

  • org.onap.relationships.inventory.Targets

  • org.onap.relationships.inventory.Uses

  • startsWith

  • tosca.relationships.AttachesTo

  • tosca.relationships.HostedOn

  • tosca.relationships.network.BindsTo

  • tosca.relationships.network.LinksTo

direction
  • IN
  • OUT
  • NONE (default value used when Tinkerpop Direction is null)
  • BOTH (default value used when string is unrecognised)

Based on and extended from https://tinkerpop.apache.org/javadocs/3.3.2/core/org/apache/tinkerpop/gremlin/structure/Direction.html

Comparison is case-sensitive

multiplicity
  • Many2Many
  • One2Many
  • One2One
  • Many2One (default value used when string is unrecognised)
Comparison ignores case
contains-other-v
  • IN
  • OUT
  • BOTH
  • NONE
  • ${direction}
  • !${direction}

This is an "edge property" that applies for traversal to the other vertex.

Comparison is case-sensitive

Note that "opposite" means:

  • IN → OUT
  • OUT → IN
  • BOTH → BOTH
  • NONE → BOTH


delete-other-v
  • IN
  • OUT
  • BOTH
  • NONE
  • ${direction}
  • !${direction}

This is an "edge property" that applies for traversal to the other vertex.

Comparison is case-sensitive

Note that "opposite" means:

  • IN → OUT
  • OUT → IN
  • BOTH → BOTH
  • NONE → BOTH
SVC-INFRA
  • IN
  • OUT
  • BOTH
  • NONE
  • ${direction}
  • !${direction}

This is an "edge property" that applies for traversal to the other vertex.

Comparison is case-sensitive

Note that "opposite" means:

  • IN → OUT
  • OUT → IN
  • BOTH → BOTH
  • NONE → BOTH
prevent-delete
  • IN
  • OUT
  • BOTH
  • NONE
  • ${direction}
  • !${direction}

This is an "edge property" that applies for traversal to the other vertex.

Comparison is case-sensitive

Note that "opposite" means:

  • IN → OUT
  • OUT → IN
  • BOTH → BOTH
  • NONE → BOTH
default
  • true
  • false (default value used when string is unrecognised)


Default EdgeRule will apply when no other more specific rule applies ?

Based on https://docs.oracle.com/javase/7/docs/api/java/lang/Boolean.html#valueOf(java.lang.String)

Comparison ignores case

description

(literal string as entered in EdgeRule file)


Optional for backwards compatibility with v12 and earlier (default value is empty string)

The EdgeRule JSON format does not permit comments (presence of comments appears to make the parser skip entries in the file).

Questions

  1. Is there a way to find/remove the unused/redundant EdgeRules from the json file?
  2. Is there any plan to simplify EdgeRules into an unambiguous canonical form (might be easier to read and write correctly)?


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