DDS Tutorial -- Part II Hands On - OMG

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Pub-Sub versus Data-Distribution• Pub-Sub– Only messages no concept of data– Each message is interpreted without context– Messages must be delivered FIFO or according tosome “priority” attribute– No Caching of data– Simple QoS: filters, durability, lifespan• Data-Distribution– Messages represent update to data-objects– Data-Objects identify by a key– Middleware maintains state of each object– Objects are cached. Applications can read atleisure– Smart QoS• Ownership• History (per key)• Deadline– Subsumes Pub-Sub1 2 31 2 3Topic/Queue11 31 2 2 31 2 31 2 3 1 2 3 1 2 3© 2009 Real-Time Innovations, Inc.
DDS Service Model:Communication ModelProvides a “Global Data Space” that is accessible to all interestedapplications.– Data objects addressed by Domain, Topic and Key– Subscriptions are decoupled from Publications– Contracts established by means of QoS– Automatic discovery and configurationParticipantPubPubParticipantSubTrack,1Track,2Track,3SubParticipantGlobal Data SpaceParticipantPubAlarmSubParticipant© 2009 Real-Time Innovations, Inc.
Page 1 and 2: DDS Tutorial -- Part IIHands OnGera
Page 3 and 4: Context: Middleware TechnologiesThe
Page 5 and 6: With increased complexity…End Use
Page 7 and 8: … middleware becomes necessaryEnd
Page 9 and 10: Network Middleware Examples• DDS,
Page 11 and 12: Middleware Communication ModelsPoin
Page 13: Queue versus Pub-Sub• Queue- Mess
Page 17 and 18: Other (non DDS)Commercial Pub-Sub M
Page 19 and 20: History:DDS the Standard(s)• Data
Page 21 and 22: DDS mandated for data-distribution
Page 23 and 24: DDS Adoption -Transportation, Indus
Page 25 and 26: Main differences of DDS vs other Pu
Page 27 and 28: Demo: ConceptsDisplay Area:Shows st
Page 29 and 30: QoS: Quality of ServiceQoS PolicyDU
Page 31 and 32: #2 Performance & ScalabilityDDS was
Page 33 and 34: Latency - (Linear Scale)DDS/JMS/Not
Page 35 and 36: DDS compared to JMS( 2KB messages )
Page 37 and 38: Message bus architecturesJMSEnterpr
Page 39 and 40: Discovery Service• DDS provides t
Page 41 and 42: Data PersistenceA standalone servic
Page 43 and 44: Durable Writers• Durable Writers
Page 45 and 46: Last value cache• A last-value ca
Page 47 and 48: DDS Real-Time Recording Service•
Page 49 and 50: #5 Natural with SOA building blocks
Page 51 and 52: Complex Event Engine Integration•
Page 53 and 54: Agenda• Context: Middleware Techn
Page 55 and 56: Middleware-based Message-Centric Sy
Page 57 and 58: Middleware-based Data-Centric Syste
Page 59 and 60: DDS Global Data• Address in Globa
Page 61 and 62: Example: Publication// Entities cre
Page 63 and 64: How to Get Data? (Listener-Based)//
Page 65 and 66:
Listeners, Conditions & WaitSetsMid
Page 67 and 68:
Listeners, Conditions and Statuses
Page 69 and 70:
Hands-on Example (C++)MyType.slnMyT
Page 71 and 72:
Components/Mechanics of the GDSAppl
Page 73 and 74:
Global Data Space / Global State•
Page 75 and 76:
Domain and Domain ParticipantsUsing
Page 77 and 78:
QoS: OwnershipSpecifies whether mor
Page 79 and 80:
Configure the Cache Management• C
Page 81 and 82:
lifespan_pubQoS: Lifespanlifespan_s
Page 83 and 84:
Subscriptions: By Topic, Subject, C
Page 85 and 86:
Cache Management in Action• Topic
Page 87 and 88:
Tunable Reliability Protocol• Con
Page 89 and 90:
Confirmed Reliability INo packet lo
Page 91 and 92:
Configure Notifications, Fault Dete
Page 93 and 94:
QoS: Liveliness -Type and Durationl
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DDS Tutorial -- Part II Hands On - OMG

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