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QualityOfServiceMonitor-SysDD.md

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QUALITY OF SERVICE MONITOR
System Design Description

The purpose of QoS Monitor supporting core system is providing QoS (Quality of Service) measurements to the QoS Manager (which is part of the Orchestrator core system).

#1589F0 AH Service Registry #f03c15 AH Authorization #c5f015 AH Orchestrator / QoS Manager

#ffd33d AH Gatekeeper #24292e AH Gateway #ffcc44 AH QoS Monitor

Alt text

Services and Use Cases

Provided Services

The QoS Monitor provides the following services:

Client:

Private:

Consumed Services

Service Registry Core System:

  • Query

Gatekeeper Core System:

  • Pull Clouds
  • Get Cloud
  • Collect Access Types
  • Collect System Addresses
  • Relay Test

Use Case: Echo Service

Name Description
Brief Description Returns a short message if the system is alive.
Access Control All system within the local cloud are allowed to access
Primary Actors QoS Monitor
Preconditions - 
Main Flow * Request sent by client.
* Request procced and response sent by QoS Monitor.

Use Case: Public Key Service

Name Description
Brief Description Returns the Public Key of QoSMointor Core System as a Base64 encoded text.
Access Control All system within the local cloud are allowed to access
Primary Actors QoS Monitor
Preconditions - 
Main Flow * Request sent by an allowed core system.
* Request procced and response sent by QoS Monitor.

Use Case: Intra-Cloud Ping Measurement Service

Name Description
Brief Description Returns the ping related values measured by a scheduled task for systems within the local cloud.
Access Control Only Orchestrator and Gatekeeper Core Systems are allowed to access
Primary Actors QoS Monitor
Secondary Actors Service Registry
Preconditions Service Registry has to be availble.
Main Flow * Intra-Cloud Ping Measurement Task scheduled
* Task queries Service Reqistry for systems and select one to be measured
* Stored or immediate measurement details are provided upon request

Activity diagram: Intra-Cloud Ping Measurement Service: Alt text

Activity diagram: Intra-Cloud Ping Measurement Task: Alt text

Use Case: Intra-Cloud Ping Median Measurement Service

Name Description
Brief Description Calculates and returns the median ping related values based on the given attribute.
Access Control Only Orchestrator and Gatekeeper Core Systems are allowed to access
Primary Actors QoS Monitor
Secondary Actors -
Preconditions -
Main Flow * Request sent by an allowed core system
* Calculation performed and response sent by QoS Monitor.

Use Case: Inter-Cloud Direct Ping Measurement Service

Name Description
Brief Description Returns the ping related values measured by a scheduled task for systems located within a neighbor cloud accessible without Gateway Core System.
Access Control Only Orchestrator and Gatekeeper Core Systems are allowed to access
Primary Actors QoS Monitor
Secondary Actors Gatekeeper
Preconditions Gatekeeper has to be available.
Main Flow * Inter-Cloud Direct Ping Measurement Task scheduled
* Task queries Gatekeeper for clouds with direct access and select one to measure its systems
* Stored measurement details are provided upon request

Activity diagram: Inter-Cloud Direct Ping Measurement Task: Alt text

Use Case: Inter-Cloud Relay Echo Measurement Service

Name Description
Brief Description Returns the measurement values processed by a scheduled task for neighbor clouds accessible only via Gateway Core System.
Access Control Only Orchestrator and Gatekeeper Core Systems are allowed to access
Primary Actors QoS Monitor in both cloud
Secondary Actors Gatekeeper, Relay
Preconditions Gatekeeper and Relay(s) has to be available.
Main Flow * Inter-Cloud Relay Echo Measurement Task scheduled
* Task queries Gatekeeper for clouds without direct access and select one to measure it
* Stored measurement details are provided upon request

Activity diagram: Inter-Cloud Relay Echo Measurement Task: Alt text

Use Case: Init Relay Test Service

Name Description
Brief Description Launch an inter-cloud relay echo test session for the given cloud and via the given relay.
Access Control Only Gatekeeper Core Systems are allowed to access
Primary Actors QoS Monitor in both cloud
Secondary Actors Gatekeeper in both cloud, Relay(s)
Preconditions Gatekeepers and Relay(s) has to be available.
Main Flow * Inter-Cloud Relay Echo Measurement Task selects a cloud-relay pair
* Task instruct the local cloud's Gatekeeper to negotiate the creation of test session
* QoS Monitor creates message queues based on the negotiation for testing the connection between local cloud and target cloud through the given relay

Use Case: Join Relay Test Service

Name Description
Brief Description Join to an inter-cloud relay echo test session requested by an other cloud.
Access Control Only Gatekeeper Core Systems are allowed to access
Primary Actors QoS Monitor in both cloud
Secondary Actors Gatekeeper in both cloud, Relay(s)
Preconditions Gatekeepers and Relay(s) has to be available.
Main Flow * Gatekeeper receives a test session negotiation message via relay from the requester cloud's Gatekeeper
* Requested cloud's Gatekeeper insturcts QoS Monitor to create message queues for the relay being measured
* Requested cloud's QoS Monitor returns the test session information to the Gatekeeper which forwards it to the requester cloud's Gatekeeper