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QoS Enabled Middleware: Adding QoS Management Capabilities to the CORBA Component Model Craig Rodrigues Gary Duzan Real-time CCM Meeting March 1, 2003 BBN Technologies Presentation Outline Overview of what CCM offers to DRE application developer

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qos enabled middleware adding qos management capabilities to the corba component model

QoS Enabled Middleware: Adding QoS Management Capabilities to the CORBA Component Model

Craig Rodrigues

Gary Duzan

Real-time CCM Meeting

March 1, 2003

BBN Technologies

presentation outline
Presentation Outline
  • Overview of what CCM offers to DRE application developer
  • Description of what CCM lacks in terms of QoS Management features
  • Description of QoS Management strategies (in-band, out-of-band)
  • Description of cross-cutting nature of QoS Management
    • QoS management across multiple components
    • QoS management between components and containers
  • Further references and standards activity
ccm benefits for dre systems
CCM Benefits for DRE Systems
  • DRE systems consist of many Resource Consuming Components (RCC)
  • An RCC is a processing entity which cooperates with other entities in the execution of a certain activity, and consumes some type of system resource (ie. CPU, network, etc.)
  • CCM allows us to:
    • Specify the properties of an RCC
    • Specify the services offered by the RCC (facets) and services required by the RCC (receptacles)
    • Specify how an RCC can be connected to other components in a larger system (assembly)
ccm lacks features for specifying qos for resource consuming components
CCM lacks features for Specifying QoS for Resource Consuming Components
  • CCM does not give us:
    • Ways to specify end-to-end QoS requirements, i.e. QoS Characteristics and QoS Values
    • Ways to specify adaptation strategies for how RCC’s can coordinate with other entities in order to meet QoS requirements
    • Ways to specify QoS management which cross multiple system and application level boundaries
qos management in dre systems
QoS Management in DRE Systems
  • Managing end-to-end QoS involves managing resources which cross multiple system and application-level boundaries
  • Network-level resource management
    • QoS specific protocols such as RSVP and Diffserv
    • Enhanced transport protocols (SCTP)
    • Traffic shapers and firewalls
  • Processor-level resource management
    • CPU scheduling strategies
    • CPU reservations
  • Resource management of application specific behaviors
    • Frame dropping
    • Compression
ccm should allow qos management to cross cut components
CCM Should Allow QoS Management to Cross-Cut Components

ClientComponent

Service AComponent

  • QoS is a cross-cutting concern that can affect the interaction between multiple components
  • CCM must allow for complex component interactions that will result from implementing cross-cutting QoS management

Service BComponent

Service CComponent

QoS Management

Infrastructure

QoS Management

Infrastructure

quo extends the distributed object model to provide qos management

in args

OBJECT

(SERVANT)

OBJECT

(SERVANT)

in args

Contract

Contract

CLIENT

CLIENT

OBJECT

(SERVANT)

OBJECT

(SERVANT)

operation()

OBJ

REF

out args + return value

IDL

SKELETON

IDL

STUBS

OBJECT

ADAPTER

Network

ORB

ORB

ORB

ORB

IIOP

IIOP

IIOP

IIOP

Network

QuO Extends the Distributed Object Model to Provide QoS Management

Application

Developer

CORBA DOC MODEL

Mechanism

Developer

Application

Developer

CLIENT

CLIENT

operation()

OBJ

REF

out args + return value

Delegate

Delegate

QuO

Developer

SysCond

SysCond

SysCond

QUO/CORBA DOC MODEL

SysCond

IDL

SKELETON

MECHANISM/PROPERTY

MANAGER

IDL

STUBS

OBJECT

ADAPTER

Mechanism

Developer

adding qos management capabilities to the corba component model

OBJECT ADAPTER

OBJECT ADAPTER

ORB

ORB

IIOP

IIOP

in args

out args + return value

Server/SinkComponent

Client/SourceComponent

events

Contract Component

Contract Component

DelegateComponent

DelegateComponent

SysCond

SysCond

SysCond

SysCond

MECHANISM/PROPERTY

MANAGER

COMPONENT

SKELETON

Network

COMPONENT

STUBS

Adding QoS Management Capabilities to the CORBA Component Model

in args

out args + return value

Server/SinkComponent

Client/SourceComponent

Application

Developer

events

COMPONENT MODEL

COMPONENT

SKELETON

COMPONENT

STUBS

Network

Mechanism

Developer

ORB

ORB

IIOP

IIOP

Application

Developer

QoSComponent

Developer

QUO/COMPONENT MODEL

Mechanism

Developer

important places where qos can be inserted in a component based dre application
Important Places where QoS Can Be Inserted in a Component-based DRE Application
  • Interaction between components (in-band)
  • Interaction between components and environment (out-of-band)
  • Interaction between components and containers
quo provides in band and out of band adaptation and control
QuO Provides In-Band and Out-of-Band Adaptation and Control
  • In-band adaptation provided by the delegate and gateway
    • A delegate decides what to do with a method call or return based upon the state of its contract
  • Out-of-band adaptation triggered by transitions in contract regions
    • Caused by changes in the system observed by system condition objects
adding qos management between components in band

OBJECT ADAPTER

ORB

ORB

IIOP

IIOP

in args

out args + return value

Server/SinkComponent

Client/SourceComponent

events

Contract Component

Contract Component

DelegateComponent

DelegateComponent

SysCond

SysCond

SysCond

SysCond

MECHANISM/PROPERTY

MANAGER

COMPONENT

SKELETON

Network

COMPONENT

STUBS

Adding QoS Management Between Components (in-band)
  • Modeling QoS infrastructure as components allows us to use standard component assembly mechanisms to introduce QoS behaviors to component-based DRE applications
adding qos management between components and environment out of band

OBJECT ADAPTER

ORB

ORB

IIOP

IIOP

in args

out args + return value

Server/SinkComponent

Client/SourceComponent

events

Contract Component

Contract Component

DelegateComponent

DelegateComponent

SysCond

SysCond

SysCond

SysCond

MECHANISM/PROPERTY

MANAGER

COMPONENT

SKELETON

Network

COMPONENT

STUBS

Adding QoS Management between Components and Environment (out-of-band)
  • Changes in environment as detected by monitoring SysConds (sensors) trigger adaptive behaviors through Callbacks (actuators)
inserting qos management capabilities into ccm between components and containers

QoS

Management

Home

C

l

i

e

n

t

CORBA

Component

Container

API

POA

Container

API

Container

Inserting QoS Management Capabilities into CCM between Components and Containers

ORB

RT Scheduling 2.0

RT Trader

FT/RT Event

CPU Scheduling

qos management behaviors can be added to ccm by using reusable qoskets

in args

out args + return value

Server/SinkComponent

Client/SourceComponent

Delegate

Templates

Qosket

events

DelegateComponent

DelegateComponent

SysCond

SysCond

OBJECT ADAPTER

SysCond

ORB

ORB

IIOP

MECHANISM/PROPERTY

MANAGER

SysCond

COMPONENT

SKELETON

IIOP

Contracts

COMPONENT

STUBS

SysConds

Callback

Objects

Contract Component

Contract Component

Network

QoS Management Behaviors can be Added to CCM by Using Reusable “Qoskets”
  • Qosket bundles a set of contracts (CDL), system condition objects (IDL), and QoS adaptive behavior (ASL)
  • Qosket provides reusable QoS Management behavior to application
  • Qoskets are cross-cutting, their interfaces will not map directly to CCM interfaces
conclusions
Conclusions
  • Integrating QoS management into the CORBA Component Model will be important for developing component-based DRE applications
  • QuO offers a middleware framework for QoS-enabled applications
  • QuO functionality integrated with CCM would provide more flexible and reusable QoS Management behaviors
further references and ongoing standards activity
Further References and Ongoing Standards Activity
  • CORBA Component Model specification, http://doc.omg.org/ptc/02-08-03
  • Quality of Service for CCM draft RFP,http://doc.omg.org/mars/03-01-18http://doc.omg.org/mars/03-01-19
  • UML Profile for QoS and FT Characteristics and Mechanisms, RFP responsehttp://doc.omg.org/realtime/02-09-01
    • Co-authored by I-Logix, THALES, Tri-Pacific
    • Supported by Lockheed Martin, ARTISAN, Softeam, and others
overview of quality of service terminology and concepts
Overview of Quality of ServiceTerminology and Concepts *

* source: UML Profile for QoS RFP response

qos basic terminology
QoS: Basic Terminology
  • QoS Characteristics
    • Represent quantifiable characteristics of services.
    • Specified independently of the elements they qualify, and represent non-functional aspects such as:
    • Latency, Throughput, Capacity
    • Availability, Reliability, Integrity, Safety
    • Error probability, Accuracy
    • Confidentiality, Access Control
qos basic terminology20
QoS: Basic Terminology
  • QoS Value Definitions
    • Quantification of QoS Characteristics
    • for latency, we can quantify end-to-end delay of a function, the mean time of all executions, or the variance of time delay
  • QoS Capability
    • A way of grouping together QoS Characteristics for large, complex systems which may have many QoS Characteristics
    • Performance: refers to timeliness aspects of a system, and incorporates characteristics such as latency and throughput
    • Dependability: refers to the reliability of the service provided by a system, and incorporates characterstics such as: availability, reliability, safety, integrity
    • Security: incorporates characteristics such as access control and confidentiality
qos basic terminology21
QoS: Basic Terminology
  • QoS Contract
    • System requirements that include restrictions that the system must adhere to
    • Can be specified in terms of QoS Values, which restrict QoS Characteristics, such as maximum latency
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