SOA-10: Event-Driven SOA: EDA in an SOA World Ken Wilner

Transcription

SOA-10:
Event-Driven SOA:
EDA in an SOA World
Ken Wilner
Vice President of Technology
Process Order
Process
Order
Service
3
Fulfill Order
Light Weight
Request/Reply
Process
Order
2
1
Validate
Order
Check
Credit
External
Credit
Rating
Service
Credit
Rating
Heavy Weight
Request/Reply
2 © 2005 Progress Software Corporation
SOA-10: Event-Driven SOA: EDA in an SOA World
Process Order – Separate Polling
Process
Process
Order
Service
Light Weight
Request/Reply
Process
Order
2
3
1
Validate
Order
Fulfill Order
Customer
Mgmt
Service
Credit
Rating
Check
Credit
Heavy Weight
Request/Reply
Sent
Periodically
Medium Weight
Request/Reply
2a
2
Customer
Mgmt
External
Credit
Rating
Service
1
Check
Credit
Process Order – Event Driven Way
Process
Order
Service
Light Weight
Request/Reply
Process
Order
2
3
1
Validate
Order
Fulfill Order
Customer
Mgmt
Service
Credit
Rating
Check
Credit
Medium Weight
Request/Reply
2a
2
Customer
Mgmt
External
Credit
Rating
Service
One-Way
Event sent in
Real Time
1
Check
Credit
The Business Value
of Software Events

Efficiency
–
–
–
–

Push technology
Replaces batch processing or polling
Real-time monitoring of business state
Parallel activities
Agility
– Facilitates instance-level long running business
processes
– Promotes flexible processes that are adaptable to
changes in the business environment
Agenda





Event-Driven Applications
Events and SOA
OpenEdge™ RA and Events
Case Study
Summary
Invocation Models

Request/Reply
– Request - a request to do something
– Reply - an indication that the request was
processed

Event
– an indication that something occurred in
the past
Request/Reply
Synchronous Bi-directional Communication
Please do this
for me. I’ll
wait until I get
the reply.
Request
Provider
Consumer
Reply
Did it. Sorry it
took me so
long!!!

Physical connection couples request/reply

Failure of connection terminates execution

Consumer assumes reply received shortly after request sent

Single provider receives request implies limited scalability
Request/Reply Flow
Online Ordering
Application
Supplier Service
Inventory Mgmt
Service
Order Mgmt
Service
Credit Services
Event
Asynchronous uni-directional communication
It
happened
Event
Event
Source
Event
Sink

Each event sent independently of another

Coupling between events handling by source and sink

Multiple sources may send the same event and multiple
sinks may receive same event so highly scaleable
Event Flow
Fork
Online
Ordering
Application
Inventory
Mgmt
Service
Order Mgmt
Service
Join
Shipping
and
Fulfilling
Credit Services
Request/Reply vs. Events
Request/Reply
Events
Component to
Component
Coupling
1 to 1
Many to many
Flow of Control
Synchronous
Asynchronous
Path of Execution
Linear and
hierarchical
Reactivity
Closed loop
Supports
dynamic and
parallel
Dynamically
reactive
Events-Driven Application Models
Asynchronous One-way Communication




Simple Events
Brokered Events
Enterprise Service Busses
Event Stream Processing Engines
Simple Event
Event
Event
Source
Event
Sink
It
happened
Simple Events – Simulating
Request/Reply
Request Event
(req-id)
Event
Provider
Sink
Event
Consumer
Source
Reply Event
(req-id)

Req-id couples request/reply

Reply sent independently of request

Consumer assumes reply may be received along
time after request
Brokered Events
Event
Source
Event
Event
Event
Sink
Event
Event
Sink
Message
Broker
Message
Event
Source
Event

Event routed from source to one or more sink

Optionally stored persistently until delivered

Various ack modes guarantee delivery, e.g. auto,
client, duplicates O.K.
Brokered Events – Point to Point
Send to One Interested Party
Sender
Receiver
Message
Broker
Event
Source
Queue
Event
Sink
connect
Brokered Events – Point to Point
Send to One Interested Party – Multiple Receivers
Sender
Receiver
Message
Broker
Event
Source
Queue
Event
Sink

Event delivered to one receiver

Multiple receivers promotes scalability

All clients are created equal
Event
Sink
Brokered Events – Publish/Subscribe
Send to All Interested Parties
Subscribers
Publisher
Message
Broker
Event
Source
Event
Sink
Topic
Event
Sink
subscribe
Event
broadcast to all interested parties, e.g. “Hot Deals”
Subscribers
Durable
can be added dynamically
subscriptions support guaranteed delivery
Enterprise Service Bus –
Routed Events
Intelligent Routing
ESB
Yes
Event
Source
order count < 100
No
Combined
Event
Sink
Event
Sink
with brokered event mechanisms
Content-based
routing
Transformation
Standards-based;
e.g. XML and Web Services
Enterprise Service Bus Orchestration Service
Sophisticated Process Flow
Event
Source
Event
Source
Event
ESB
Event
Event
Event
Event
Sink
Event
Sink

Combines basic ESB services with long running stateful processes

Supports looping constructs, state management, conditional constructs,
fork thread, join, etc.

Publish event, wait for event, etc.
Event Stream Processing (ESP)
Aggregating and Correlating Events
IF PRGS Price < PRGS VWAP THEN
Buy PRGS
Event
Source
Event
Stream
Event
Manager
Event
Event
Sink
Rules
Events
Filter
rules
Aggregation
Event
of events
detection patterns
Agenda





Events and SOA
OpenEdge RA and Events
Case Study
Summary
Service-Oriented Architecture
An approach for building distributed
computing systems based on
encapsulating business functions
as services that can be easily
accessed in a loosely coupled
fashion.
How Do Events Support
These Principles?



SOA is good.
Events are good.
How do I marry
the two????
SOA: Component Architecture
Service
Director
y
Find /
Details
Service
Consumer
Publish
Bind /
Invoke
Service
Provide
r
Service Contracts
Everything You Need to Know to Access the
Service Provider
Service
Provide
r
Service
Requestor
Contract

Service Interface

Service Location and Transport

Service Description and Sequencing Requirements

Error Handling

SLAs
SOA and Events
Event
Sink
Notification
Service
Consumer
Event
Source
One-way
Service
Consumer
Event
Source
Service
Provide
r
Event
Sink
Service
Provide
r
SOA Architectural Layers
Application
Client Layer
ESB Orch.
Service
Brokered Events
ESP,
ESB Routed Event
Business
Process
Services
Intermediary
Services
Basic
Services
Broker as an Intermediary Service
Event
Service
Consumer
Source
Event
Event
One-way
One-way
Event
Service
Sink
Provide
r
Service
Message
Intermediary
Broker
One-way
Event
Service
Source
Consumer
One-way
Event
Event
Service
Event
Provide
Sink
r
Enterprise Service Bus –
Routed Events
Intelligent Routing
ESB
Yes
Event
Service
Source
Consumer
Event
One-way
Event
Service
Intermediary
Service
Event
Provide
Sink r
order count < 100
One-way
No
Event
One-way
Service
Event
Provide
Sink
r
Agenda





Events and SOA
Case Study
Summary
OpenEdge RA Service Components
Enterprise
Services
Users
Service Consumer
Presentation Layer
Integration Layer
Business Servicing Layer
Data Access Layer
Service Provider
Managed
Data Stores
Unmanaged
Data Stores
Business Layer Integration
Enterprise
Services
Users
Presentation Layer/s
Integration Layer/s
Service Adapter
Service Interface
Business
Workflows
Business
Tasks
Business
Entities
Data Access Layers
Managed
Unmanaged
Service Elements and Service
Contracts
Fn()
Fn()
Fn()
Service
Adapter
Event-Driven
Service Adapter
Event-Driven
Service Adapter
Service
Consumer
Request
Reply
Service
Interface
Service
Provider
One-Way
Event-Driven
Service
Interface
Notification
Event-Driven
Service
Interface
Agenda





Events and SOA
Case Study
Summary
Sedgwick Claims Management
Services, Inc.
Clients
Claimants
JURIS
Carriers
Examiners
States
Sedgwick Event Driven SOA
Update
Claim
Info
Users
Event
Capture
(DB Triggers)
JURIS
New
Claim
EMAIL
ALERT
WWW/IVR
Email
Changed
Fields
From-value
To-Value
Change
Log
“StateChanged”
Events
Event
Generator/
Quenchin
g
JMS
Enterprise Service Bus
XML
MSG
RULES ENGINE Sub-System
Email
“StateChanged”
Events
IVR
Rules
Processin
g
Engine
RULES
DATABASE
Agenda





Events and SOA
Case Study
Summary
In Summary



SOA is the architecture for
the agile business
Events are great for
maximum agility, and for
building reactive systems
Define the right services
and use the right
invocation method
Questions?
Thank you for
your time!

SOA-10: Event-Driven SOA: EDA in an SOA World Ken Wilner

Transcription

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