SOA Patterns

Patterns for building Service Oriented Architectures (SOA)

Transcript

1. SOA Patterns © 2008 Studio MikMik
2. Arnon Rotem-Gal-Oz
3. Another quiet day at the office… © Todd Bonita 2009
4. BEFORE WE BEGIN
5. SOA Service describes End Point Exposes Messages Sends/Receives Contracts Binds to Service Consumer implements Policy governed by Sends/Receives Adheres to Component Relation Key Understands Serves
6. SOA is derived from other styles Pipes and Filters Client Server Distributed Agents Layered System Stateless Comm. SOA
7. SOA vs. REST Pipes and Filters Client Server Uniform Interface Virtual Machine Distributed Agents Layered System Replicated Repository Code On Demand Stateless Comm. Cacheable REST SOA
8. SOA also means challenges…
9. …and patterns can help mitigate them Service Firewall Identity Provider Edge Component Request/Reply Transactable Service Saga Workflodize Orchestrated Choreography Client/Server/Service Composite Frontend Decoupled Invocation Gridable Service Parallel Pipelines Virtual Endpoint Service Instance Service Monitor Blogjecting Watchdog Inversion of Communications Aggregated Reporting
10. XSIGHTS, MEET AUDIENCE 
 AUDIENCE, XSIGHTS
11. Mobile Integration Applications Advertizing Management Services Resources Rich Client Link management Web based Link Managment Reporting
12. 3G Video Calls MMS Dedicated Client Mobile Integration Applications Acquisition Interactions branding Services Ad Management Interactions Reference Data Links Resources Monitoring Targeted Advertizing Campaign Mgmt. Usage Datmart Reporting Billing Data mining & Statistics Reports Link Managment Publishing tools integration Interaction Designer Web Front-end Data Interfaces 3rd parties
13. Load balancer Web Server (IIS/Apache App Server App Server App Server App Server App Server App Server App Server Web Server (IIS/Apache MMS Gateway 3G Gateway 3G Gateway Load balancer Firewall Firewall BI & Reporting DB Links Datamart usage DB References Links Registeration Sync. Server DMZ Operational Backend Advertizing clients Firewall Web Server (IIS/Apache NMS Paper Editor Smart phones DMZ Camera Phones Admin Console
14. Edge Business Logic WD Agent Event Broker Resource Allocator ServiceHost
15. namespace xsights.Infrastructure.ResourceHost.Interfaces { public interface IResourceHost : IDisposable { ICache Cache { get; } Uri ResourceUri { get; } IPAddress LocalIP { get; } IWatchDogProxy WatchDogProxy { get;} IResourceAllocator ResourceAllocator { get; } ImEventBroker EventBroker { get; } void Open(); void Open(TimeSpan timeout); void Close(); void Close(TimeSpan timeout); int FindFreePort(); } } The Service host sets up the common components and services for each Component
16. CHALLENGE – SERVICE AVAILABILITY
17. What’s in a 9
18. 0.99 reliability We have a nice little legacy business component
19. 0.99 0.99 0.99 0.99 0.99 0.99 0.99 0.99 0.99 And we move it to SOA
20. Failsafe hardware Status Technologies FT Server
21. Or try to detect failure , handle it and minimize its effect on overall service © Rosendahl
22. What’s the effect of a failure - Server E1 line = 30 concurrent video calls Call Flow Service
23. request reaction Edge Service Instance Dispatcher Distribute Request/Reply End point Service Business logic Service Instance
24. What’s the effect of a failure - Channel E1 line = 30 concurrent video calls Call Flow Channel Call Flow Channel Call Flow Channel Call Flow Channel Call Flow Channel Call Flow Channel Call Flow Channel Call Flow Channel Call Flow Channel Call Flow Channel Call Flow Channel Call Flow Channel Call Flow Channel Call Flow Channel Call Flow Channel Call Flow Channel Call Flow Channel
25. Service Instance with NLB Service Instance NLB Driver Cluster Host NIC Driver TCP/IP Windows Kernel NIC NLB Driver Cluster Host NIC Driver TCP/IP Windows Kernel NIC Virtual IP : 1.1.1.1 Real IP : 1.1.1.2 Real IP : 1.1.1.3 Service Instance Edge Windows Host NIC Driver TCP/IP Windows Kernel NIC Real IP : 1.1.1.4
26. Alternative : Virtual Endpoint
27. CHALLENGE - FLEXIBILITY
28. Request/Reply Service EndPoint Synchronous processing 1. Request 2. 3. Reply Service Consumer
29. Things look Cool & Simple ™ Sessio n negati ons Image extract ion identif ication Transl ation to links Rende r resutls 3G Call
30. Relation Key SOA Component Pattern Component Concern/attribute Edge pipeline Perform Task EndPoint Service Request Reaction EndPoint pipeline Perform Task EndPoint pipeline Perform Task EndPoint Queue Request 2 Request 1 Parallel Pipelines
31. IVP (RV) 3G GW (RV) 3G VAS (Cestel) WS Resource Manager SIP Listner RTP Image Extractor Alg. Engine Dispatcher WebConnector 3G Builder (Cestel) WebRenderer Turn out Complicated & Ugly ™
32. Inversion of Communications
33. Consumer view var sendMmsEvent = new SendMmsEvent() { FromNumber = simpleMessageDetails.DialedNumber, Subject = mmsContents.Subject, ToNumber = simpleMessageDetails.Sender, ImageExtension = mmsContents.ImageExtension, ImageAsByteArray = mmsContents.Image, TextAsByteArray = mmsContents.Text }; eventBroker.RaiseEvent(sendMmsEvent); http://www.flickr.com/photos/crimson_wolf/2851737125/sizes/l/
34. Service view public interface ImPostOffice : ImContract, IHandleSendCoupon, IHandleSendSms,IHandleStatus,IHandleAdminStatus,IHandleWapLink, IHandleSendMms { } [ServiceContract] public interface IHandleSendMms { [OperationContract] int SendMms(SendMmsEvent eventOccured); } [ServiceContract] [DataContract] public class SendMmsEvent : ImEvent { /// <summary> /// end user's number. should be in international format: +[country-code]number. Example: +491737692260 /// </summary> [DataMember] public string ToNumber { get; set; } /// <summary> /// service's number, usually a short-code. Example: 84343 /// </summary> [DataMember] public string FromNumber { get; set; }
35. Edge translates external structures to internal ones public int SendMms(SendMmsEvent eventOccured) { var eventContext = eventOccured.ToString(); if (log.IsDebugEnabled) log.Debug("inside 'SendMms', event context = [" + eventContext + "]"); var fromNumber = eventOccured.FromNumber; var sender = mmsSenderFactory.Get(fromNumber); if (null == sender) { if (log.IsWarnEnabled) log.Warn("cannot get mms sender derived from '" + (fromNumber ?? "null") + "'"); return 0; } IMmsSubmitResponse response; try { var mmsMessageDetails = new MmsMessageDetails(eventOccured.ToNumber, eventOccured.TextAsByteArray, eventOccured.ImageAsByteArray, eventOccured.ImageExtension, eventOccured.Subject); response = sender.Submit(mmsMessageDetails); } catch (Exception ex) { log.Error("cannot send mms message, context = [" + eventContext + "]", ex); return 0; } if (log.IsInfoEnabled) { var responseMessage = (null == response) ? "null" : response.ToString(); log.Info("sent mms with event context = [" + eventContext + "], response = [" + responseMessage + "]"); }
36. Sagas tie instances together for conversations
37. SIP Image Extractor Identification X Call Recovery
38. Alternative : Orchestration request Workflow Engine Workflow instance Manage Process route request Host Workflows Schedule Orchestration platform Service Service reaction Auxiliary tools Coordinator Protocol Offline designer monitor
39. Be Wary of Nano-Services
40. CHALLENGE - MANAGEMENT
41. Edge Watchdog Edge Report EndPoint Service Request Monitor EndPoint Watchdog Agent Monitor Heal Log Reports Monitor Monitor Monitor Blogjecting Watchdog
42. Blogjects concept is about collaborating objects
43. / Sessions/ Abcde/ Efgh/ Resources/ Dispatchers/ Xyz/ root 1 2 3 RESTful resource management
44. http://devrig:52141/RM/Sessions/abc/ • ATOMPUB – Session details • URI (ID) • State (start/end/status etc.) • Resources – Knows status – URI for the Resource representation on the RM – URI for the Resource itself
45. Edge Business Logic WD Agent Event Broker Resource Allocator ServiceHost
46. WatchDog Service A Service B WDWatcher
47. SIP Image Extractor Identification X Call Recovery WatchDog
49. Status Service Monitor Edge/Service In Commands Metrics collection Policy governance Security monitoring Fault Monitoring Reporting & Dashboarding Control Edge/Service Status Monitor Act Collect Notify Service Monitor
50. Image of the site-manager
51. Keep the BIT http://www.flickr.com/photos/37643027@N00/2050024263/sizes/o/
52. SIP Image Extractor Identific ation X Call Recovery WatchDog WatchDog Liveliness Monitor 3G Call
53. CHALLENGE - REPORTING
54. Reporting?! BI? 
 but the data is fragmented
55. Aggregated Reporting Subscribed/ Polled data Poll Data Edge Aggregated Reporting Service EndPoint ODS Out Pre-Proces Save Data Load report Convert Request Send Clean Join Transform Transpose Produce reports Report EndPoint Request
56. CHALLENGE – MULTI-TENNANCY 
 (LIES, I TELL YOU, ALL LIES)
57. Same event different subscribers Call Flow Player (interaction Renderer) Call Flow Bridge to 3rd Party Play Movie Event
58. Routing [ServiceContract] [Participate("3G")] public interface ImPlayer : ImContract, IHandleCallStarted, IHandleC IHandlePlayMovie,IHandleCallAborted { } [ServiceContract] [Participate("3GPartner")] public interface ImXsightsGateWay : ImContract, IHandleCallAborted, IHandlePlayMovie, IHandleReadyForSearch, IHandleSearchStarted, IHandleJoinThirdParty { }
59. Initiator A Initiator B Participant B Capacity : 1 Raise a saga initiating event Now what ?! Participant A Capacity : 2
60. Reservation Pattern
61. Event Broker Service Host Resource Allocator Business Logic Control Edge Service Host Service Host Business Logic Event Broker Service Host Resource Allocator Control Edge Service Instance #1 Service Host Business Logic Event Broker Service Host Resource Allocator Control Edge Service Instance #2 Service Host Business Logic Event Broker Service Host Resource Allocator Control Edge Reservation
62. Good old 2PC to the rescue