Facet Based Resource Model
From Gcube Wiki
Basic Concepts
- Two typologies of entities are envisaged:
- Resources, i.e. entities representing a description of "thing" to be managed;
- Facets, i.e. entities contributing to "build" a description of a Resource. Every facet, once attached to a Resource profile captures a certain aspect / characterization of the resource;
- Every facet is characterised by a number of fields / attributed;
- Two typologies of relations are envisaged:
- Entities and relations can be specialized.
- A number of specializations are identified below. Such specializations are managed by the gCube Core services, i.e. Core services builds upon these specialization to realize its management tasks;
- Other specializations can be defined by clients, the system make it possible to store these additional typologies of relations and facets and to discover them.
- On relations:
- Any relation has a direction, i.e. a "source" and a "target". Anyway the relation can be also navigated in the opposite direction;
- It is not permitted to define a Relation having a Facet as "source".
- It is not permitted to define a Relation connecting a Facet with another one;
- It is not permitted to define a Relation connecting a Facet with a Resource;
- A Facet instance can be linked (by ConsistOf or any specialization of it) from different Resources.
Facets
Early ideas and thinking on facets were documented at 2nd Generation Resource Model : Facets
Facets Specification
Every Facet has:
- An Header
- Zero or More properties
Any property can be enriched with the following attributes:
- Name : Property Name
- Type : The Type of the Property (e.g. String, Integer, ...).
- Description : The description of the property.
default=null. - Mandatory (M): Indicate if the Property is Mandatory.
default=false. - ReadOnly (RO): The property cannot change its value.
default=false. - NotNull (NN):
default=false - Max (Max):
default=null - Min (Min):
default=null - Regexpr (Reg)): A Regular Expression to validate the property value.
default=null
Access Point Facet
The goal of this facet is expected to capture information on “access points” for a resource, i.e. any endpoint to interact with the resource via a known protocol.
| Name | Type | Description | Attributes |
|---|---|---|---|
| entryName | String | An unique identifier | |
| endpoint | URI | The URI which identify the endpoint of a resource | Mandatory=true ReadOnly=true NotNull=true
|
| protocol | String | The high-level protocol used by the access point. The String could contains the version if needed.
E.g. WMS not http which is already contained in URI. |
|
| description | String | ..... | |
| authorization | String | Contains authorization information. E.g: a token, username:password. By relying on schema it should be sufficient to capture also whether the content is encrypted or not | |
| authorizationSchema | URI | .... | |
| properties | String | This can be an arbitrarily complex element whose "structure" is defined by the associated schema | |
| propertiesSchema | URI | .... |
Contact Facet
The goal of this facet is expected to capture contact information.
| Name | Type | Description | Attributes |
|---|---|---|---|
| name | String | TBD Contains Name and Surname maybe also middle name and title (Dr. Mr.) or we add a new fields | Mandatory=true NotNull=true
|
| String | An RFC‑822 compliant email address. | Mandatory=true NotNull=true Regex see http://www.ex-parrot.com/~pdw/Mail-RFC822-Address.html
| |
| website | URL | ... | |
| address | String | ... | |
| phone | String | ... |
Coverage Facet
The goal of this facet is to collect any extent-related information.
| Name | Type | Description | Attributes |
|---|---|---|---|
| spatialSchema | URI | ... | |
| temporal | String | ... | |
| temporalSchema | URI | ..... |
CPU Facet
The goal of this facet is to describe CPU information.
TODO to be reviewed
| Name | Type | Description | Attributes |
|---|---|---|---|
| model | String | ... | |
| vendor | String | ... | |
| clockSpeed | String | ... |
Descriptive Metadata Facet
The goal of this facet is to collect any descriptive metadata about the resource.
| Name | Type | Description | Attributes |
|---|---|---|---|
| value | String | Inherited. E.g. XML Blob | |
| schema | URI | ... |
Event Facet
The goal of this facet is to collect any descriptive metadata about the resource.
| Name | Type | Description | Attributes |
|---|---|---|---|
| type | String | ... | |
| typeSchema | URI | ... | |
| date | String | ... | |
| dateSchema | URI | ... |
Functionality Related Facet
The goal of this facet is to capture what are the facilities supported (Challenging because of the different audiences) Something very "poor" ... we can have a look at WPS spec
| Name | Type | Description | Attributes |
|---|---|---|---|
| name | String | ... | |
| description | String | ... | |
| input | String | ... | |
| output | String | ... |
Identification Facet
The goal of this facet is to collect information on Identifiers that can be attached to a resource.
| Name | Type | Description | Attributes |
|---|---|---|---|
| value | String | The identifier. E.g. http://fr.dbpedia.org/resource/Thunnus de305d54-75b4-431b-adb2-eb6b9e546014 | |
| type | Enumeration | The typology of identifier. E.g. URI, DOI, IRI, URL, URN, UUID; | |
| isPersistent | boolean | To indicate if the Identifier is persistent or not. |
Network Address Facet
The goal of this facet is to capture IP information
| Name | Type | Description | Attributes |
|---|---|---|---|
| hostName | String | ... | |
| domainName | String | ... | |
| IPAddress | String | ... | |
| mask | String | ... | |
| broadcastAddress | String | ... |
Regular expression to validate different IPv4 addresses are available at:
Both IPv4 and IPv6: http://stackoverflow.com/questions/53497/regular-expression-that-matches-valid-ipv6-addresses
License Facet
The goal of this facet is to .....
| Name | Type | Description | Attributes |
|---|---|---|---|
| value | String | ... | |
| schema | URI | Licence URI |
Memory Facet
The goal of this facet is to .....
| Name | Type | Description | Attributes |
|---|---|---|---|
| size | Long | ... | |
| used | Long | ... | |
| unit | String | ... |
Persistent Memory Facet
Specialization of Memory Facet
TBD if instead of subclassing is better subclassing ConsistOf relation of reintroduce purpose in relation or header
Volatile Memory Facet
Specialization of Memory Facet
TBD if instead of subclassing is better subclassing ConsistOf relation of reintroduce purpose in relation or header
Peripheral Facet
The goal of this facet is to .....
| Name | Type | Description | Attributes |
|---|---|---|---|
| model | String | ... | |
| vendor | String | ... |
Provenance Facet
The goal of this facet is to collect information related with resource lineage/provenance
| Name | Type | Description | Attributes |
|---|---|---|---|
| relationship | Enum | wasGeneratedBy | ... | |
| reference | String | resourceID (a reference to the "originator" Resource associated to the resource the facet is attached to by the relationship) | |
| provenanceDocument | String | ... E.g. the xml format | |
| provenanceDocumentSchema | String | ... E.g. a reference to the format |
Simple Property Facet
The goal of this facet is the base class for all facets described by a value and the schema of the value
| Name | Type | Description | Attributes |
|---|---|---|---|
| value | String | ... | |
| schema | URI | ... |
Software Facet
The goal of this facet is to capture SW related features"
| Name | Type | Description | Attributes |
|---|---|---|---|
| name | String | The name of the software artefact being described. E.g. artifactId in maven, Service Name in gCube software, the software name for retail software Microsoft Office 2013-SP2. | |
| group | String | The name of "group" the software artefact belongs to. E.g. groupId in Maven, ServiceClass in gCube software, company name for retail software Microsoft Office 2013-SP2. | |
| version | String | The particular release of the software artefact. E.g. maven version, Service Version in gCube software, artifactId in maven, the software version for retail software Microsoft Office 2013-SP2. | |
| description | String | A human oriented description of the software artefact being described. | |
| qualifier | String | E.g. packaging or scope in maven, scope level or sharable level in gCube software, target architecture for retail software x86 or amd64. | |
| role TO BE REMOVED | String | Identify the role of this facet. E.g. dependency. | |
| optional | boolean | .... Used in maven and in gcube |
State Facet
The goal of this facet is to ...
| Name | Type | Description | Attributes |
|---|---|---|---|
| value | String | The value of the state. Must be compliant with schema. | Mandatory=true NotNull=true
|
| schema | URI | The URI of the schema. It is only an informative field. It is not used for validation from IS part. | Mandatory=true NotNull=true
|
Service State Facet
| Name | Type | Description | Attributes |
|---|---|---|---|
| value | String | The value of the state | Mandatory=true NotNull=true Regex=(STARTED|ready|down|failed)
|
| schema | URI | Always has the value https://data.d4science.org/schema/ServiceStateFacet | Mandatory=true ReadOnly=true NotNull=true Regex=(https://data.d4science.org/schema/ServiceStateFacet)
|
Container State Facet
| Name | Type | Description | Attributes |
|---|---|---|---|
| value | String | The value of the state | Mandatory=true NotNull=true Regex=(started|ready|certified|down|failed)
|
| schema | URI | Always has the value https://data.d4science.org/schema/ContainerStateFacet | Mandatory=true ReadOnly=true NotNull=true Regex=(https://data.d4science.org/schema/ContainerStateFacet)
|
Subject Facet
The goal of this facet is to ...
| Name | Type | Description | Attributes |
|---|---|---|---|
| value | String | The value of the state. Must be compliant with schema. | Mandatory=true NotNull=true
|
| schema | URI | The URI of the schema. It is only an informative field. It is not used for validation from IS part. | Mandatory=true NotNull=true
|
Type Facet
The goal of this facet is to ...
| Name | Type | Description | Attributes |
|---|---|---|---|
| value | String | The value of the state. Must be compliant with schema. | Mandatory=true NotNull=true
|
| schema | URI | The URI of the schema. It is only an informative field. It is not used for validation from IS part. | Mandatory=true NotNull=true
|
Relation
RelatedTo
The following relations (extending the RelatedTo) have been identified and defined:
- ConfiguredBy: Software to Configuration
- CustomizedBy: Service to Configuration
- DemandsFor: Abstract Service to Software
- Host: Hosting Node to E-Service
- PoweredBy: Hosting Node to Software
ConsistOf
The following relations (extending the ConsistOf) have been identified and defined:
Resources
......
Resource
| This entity is conceived to describe every "main thing" to be registered and discovered by the Information System. | ||||
| Source | Relation | Multiplicity | Target | Description |
|---|---|---|---|---|
| Facets | ||||
| Resource | Identify | 1..n | Facet | Any Resource has at least one Facet which in some way allow to identify the Resource per se. |
| Resource | ConsistOf | 1..n | Facet | Any Resource consist of one or more facets which describes the different aspects of the facet. |
| Resources | ||||
| Resource | RelatedTo | 0..n | Resource | Any Resource can be related to any other resource. The Resource can be the source or the target of the relation. Please remind that the relation has a direction which provides the semantic of the relation. Anyway the relation can be also navigated in the opposite direction. |
The following Resources have been identified:
Actor
| Source | Relation | Multiplicity | Target | Description |
|---|---|---|---|---|
| Facets | ||||
| Actor | Identify | 1..n | Contact | ... |
| Actor | ConsistOf | 1..n | Contact | ... |
| Resources | ||||
| Actor | ... | 1..n | ... | ... |
Configuration
| Source | Relation | Multiplicity | Target | Description |
|---|---|---|---|---|
| Facets | ||||
| ... | Identify | 1..n | Identification | ... |
| ... | ConsistOf | 0..n | ... | ... |
| Resources | ||||
| Software | ConfiguredBy | 0..n | Configuration | ... |
| Service | CustomizedBy | 0..n | Configuration | ... |
Dataset
| Facets | ||
|---|---|---|
| Name | Multiplicity | Description |
| Identification | 1..n | TBD |
| Contact Facet | 1..n | Missing is role: Is he the curator, owner, creator, contributor? This is an attribute of the relation |
| Access Point Facet | ... | Missing embargoState to the attached access policy |
| License Facet | ... | Missing duration of the license applied e.g. 15 years |
| Event Facet | ... | ... |
| Provenance Facet | ... | ... |
| ConsistOf Relations | ||
| ... | ... | ... |
| RelatedTo Relations | ||
| ... | ... | ... |
Concrete Dataset
| Facets | ||
|---|---|---|
| Name | Multiplicity | Description |
| ... | ... | ... |
| ConsistOf Relations | ||
| ... | ... | ... |
| RelatedTo Relations | ||
| ... | ... | ... |
Service
| Facets | ||
|---|---|---|
| Name | Multiplicity | Description |
| Identification | 1..n | TBD |
| Contact Facet | 1..n | ... |
| ConsistOf Relations | ||
| ... | ... | ... |
| RelatedTo Relations | ||
| ... | ... | ... |
Abstract Service
| Facets | ||
|---|---|---|
| Name | Multiplicity | Description |
| ... | ... | ... |
| ConsistOf Relations | ||
| ... | ... | ... |
| RelatedTo Relations | ||
| DemandsFor (out) | 0..n | A reference to the Software .... |
E-Service
| Facets | ||
|---|---|---|
| Name | Multiplicity | Description |
| Software | 1..1 | Related with #Identify ConsistOf Relation |
| Access Point | 1..n | Identify the endpoints. |
| Event | 1..n | E.g. ActivationTime,DeploymenTime) |
| State | 1..1 | I.e. STARTED, ready, certified, down, failed. |
| Relations | ||
| Run (out) | 0..n | A reference to the Software artifact the E-Service results from. |
| Use (out,in) | 0..n | A reference to any other E-Service, the E-Service instance is invoking. |
| Host (in) | 1 | An inverse reference stemming from the Hosting Node that is operating the E-Service. |
Hosting Node
| Facets | ||
|---|---|---|
| Name | Multiplicity | Description |
| CPU Facet | 1..n | CPU Information |
| Persistent Memory Facet | 1..n | Disk Space |
| Volatile Memory Facet | 1..n | RAM |
| IP Info Facet | 1..n | IP address |
| Event | 1..n | ... |
| State | 1..1 | I.e. start, activation, stop, failure. |
| Simple Property | 1..n | E.g. Environment Variables |
| ConsistOf Relations | ||
| ... | ... | ... |
| RelatedTo Relations | ||
| PoweredBy (out) | 1..n | A reference to the Software .... |
Schema
| Source | Relation | Multiplicity | Target | Description |
|---|---|---|---|---|
| Facets | ||||
| Schema | Identify | 1..n | Identification | ... |
| Schema | ConsistOf | 1..n | SimpleValue | ... |
| Resources | ||||
| Schema | ... | 1..n | ... | ... |
Site
| Facets | ||
|---|---|---|
| Name | Multiplicity | Description |
| Contact Facet | 1..n | ... |
| Location Facet | 1..n | ... |
| ConsistOf Relations | ||
| ... | ... | ... |
| RelatedTo Relations | ||
| ... | ... | ... |
Software
| Facets | ||
|---|---|---|
| Name | Multiplicity | Description |
| Software | 1..n | Apart the one connected with #Identify relation (gCube coordinates) the others identify the sw in other way e.g. (Maven coordinates) |
| Access Point | 1..n | links to maven artifact on nexus, javadoc, wiki, svn ... |
| License | 1..n | ... |
| State | 1..n | ... |
| Relations | ||
| DependsOn (out) | 0..n | A reference to the Software |
| Require (out) | 0..n | A reference to the Service |
| Run (in) | 0..n | An inverse reference stemming from the E-Service that is running this Software |
| DemandsFor (in) | 0..n | An inverse reference stemming from the Abstract Service that is |
| PoweredBy (in) | 0..n | An inverse reference stemming from the Hosting Node that is |
Best practices and guidelines
- On Facet instances "reuse" across Resource Profiles:
- This can be guaranteed automatically by the system, if and just in the case the system want to avoid duplication of information. It is based on a configuration policy;
- This MUST be done only when a change in a facet instance MUST affect a change in all Resources connected to such a Facet.
