Date post: | 18-Dec-2015 |
Category: |
Documents |
View: | 213 times |
Download: | 0 times |
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
1
Yarema Mazuryk
Service Oriented Architecturesin Heterogeneous Environments
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
2
Context – Connected Home
Wireless LAN
Firewire (IEEE1394)
Bluetooth
Ethernet
Powerline
GG
GG
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
3
Connected Home
Client Mobility Heterogeneous Network
Ad Hoc Network
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
4
Key Aspects
Transparent control
Self organizing networksMinimal (zero) configuration
Embedded intelligence
Open protocols
Privacy
Advanced interaction
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
5
Service Oriented Architecture - Place
Transport
MiddlewareService Oriented
Platform
ApplicationClient API
Client API
Service API
Service API
Transport
Service Oriented Platform
Client API
Client API
Service API
Service API
Service1Service1Client1Client1
Open protocolOpen protocol
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
6
Service Oriented Architecture – Addressed Issues
Interoperability
Scalability
Agility
Reusability
Maintainability
Functional Incrementalism
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
7
Service Oriented Architecture – Conceptual Model
ServiceService
Service Description
Service Description
Service Advertisement
Service Advertisement
Service User
Service User
Service Implementation
Service Implementation
provides
uses retrieves
Service Advertisement
Service Discovery
+address+address
+name+name
+address+address
Eventing, Control
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
8
Service Description Example (UPnP)<actionList> <action> <!-- are we playing now? --> <name>GetPlayMode</name> <argumentList> <argument> <name>Mode</name> <relatedStateVariable>PlayMode</relatedStateVariable> <direction>out</direction> <retval /> </argument> </argumentList> </action> </actionList>
<serviceStateTable> <stateVariable sendEvents="yes"> <name>PlayMode</name> <dataType>string</dataType> <allowedValueList> <allowedValue>PLAY</allowedValue> <allowedValue>PAUSE</allowedValue> <allowedValue>STOP</allowedValue> </allowedValueList> </serviceStateTable>
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
9
SOA – “Publish-Find-Bind-Execute” Model
Provider
Consumer
NetworkNetwork
1 Publish
2Find
ContractContract3 Bind
4 Execute
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
10
SOA vs Component Based Development
Networking environment
SOA COM
Central -
Communication model Messagebased
APIbased
Interfaces Coarse-grained
Fine-grained
InstantiationAs
neededSingle &active
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
11
Addressing & Naming
Uniform addressing schemeIndependent from physical network addressing
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
12
Discovery - GOALS
Locate the service provider
Retrieve provider’s access interfaceAcquire additional information
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
13
Discovery - METHODS
Service Discovery
Service Discovery
Pre-configured
Pre-configured
Non- configured
Non- configured
Location aware
Location aware
MediatedMediated
ImmediateImmediate
Non-transparent
Non-transparent
TransparentTransparent ActiveActive PassivePassive
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
14
Advertisement
Publish information about the service implementation
Service DescriptionProvider’s location
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
15
Eventing & Control
Provider
Consumer
execute action A,subscribe to event B
Event B
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
16
Existing Approaches
UPnP - IP-bound, has scalability problems
JXTA - Network independent, existing implementation has performance problems
Pastry - Focuses on efficient request routing
Web services - IP-bound
Can we base on one of these or do we need something new?
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
17
What is JXTA?
*borrowed from www.jxta.org
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
18
JXTA Vision
• promote communication (not isolation) among applications
• keep the core small and elegant
• support multiple platforms and languages, micro devices to servers
• address security from the beginning
• JXTA is an open source project
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
19
JXTA Architecture
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
20
JXTA – Set of XML-based Protocols
Peer Discovery Protocol—Enables peers to discover peer services on the network
Peer Resolver Protocol—Allows peers to send and process genericrequests
Rendezvous Protocol—Handles the details of propagating messages between peers
Peer Information Protocol—Provides peers with a way to obtain status information from other peers on the network
Pipe Binding Protocol—Provides a mechanism to bind a virtual communication channel to a peer endpoint
Endpoint Routing Protocol—Provides a set of messages used toenable message routing from a source peer to a destination peer
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
21
JXTA – Key Concepts
PeerPeer
RdvPeer
RdvPeer
PeerPeer
PeerPeer
Peer Group
PipePeerPeer
RelayPeer
RelayPeer
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
22
Case Study
Distributed Data Storage in Service-Oriented FashionDistributed Data Storage in Service-Oriented Fashion
JXTAJXTA UPnPUPnP ......
ANALYZE & COMPARE: Performance (discovery latency, memory
usage, ...)Scalability
Ad hoc networkingClient mobility
...
ANALYZE & COMPARE: Performance (discovery latency, memory
usage, ...)Scalability
Ad hoc networkingClient mobility
...
PROPOSE: Service Oriented FrameworkPROPOSE: Service Oriented Framework
Apr 18, 2023 Y. Mazuryk, [email protected]/e Informatica, System Architecture and Networking
23
Future Work
Accommodate real-time requirements in SOAInvestigate security aspects
Interaction with the userInteraction between services
Group servicesMobile services
...