1. Designing software applications
Lection 4
Middleware software

2. Soap protocol

3. Soap web-services
Abstraction. The details of a service implementation are hidden.
A service only reveals its interface (operations, inputs, outputs).

4. Soap web-services
Composability. Services are designed to be capable of being assembled into larger composite services. In some cases, a composite service provides coordination of the individual services.

5. Soap web-services
Autonomy. Each service is self-contained, such that it can operate independently.
Reusability. A key goal of SOA is to design services that are reusable. The design goals of services are intended to facilitate reuse.

6. Soap web-services
Statelessness. Where possible, services maintain little or no information about specific client activities.
Discoverability. A service provides an external description.

7. SOAP web-services Service-oriented
Each service supports a set of operations

8. SOAP web-services
SOAP
HTTP
WSDL
XML

9. SOAP Message
Header
Routing information
Body
Message content

10. SOAP Message ASP.NET MVC Web-services Windows Communication Foundation
Django + soaplib 
Java Platform, Enterprise Edition

11. WSDL
Web services description language

12. WSDL Parts
Service
Endpoint
Binding
Operation
Types

13. WSDL Parts <description>
<documentation></documentation>
<types> </types>
<interface> </interface>
<binding></binding>
<service></service>
</description>

14. WSDL Parts
<interface name = "reservationInterface" > <operation name="opCheckAvailability"> <input messageLabel="In" element="ghns:checkAvailability" /> <output messageLabel="Out" element="ghns:checkAvailabilityResponse" /> </operation> </interface>

15. WSDL Parts
Every WSDL 2.0 document has a description element as its top-most element. This merely acts as a container for the rest of the WSDL 2.0 document, and is used to declare namespaces that will be used throughout the document.

16. WSDL Parts
<?xml version="1.0" encoding="utf-8" ?> <description xmlns=" targetNamespace= " xmlns:tns= " > </description>

17. WSDL Parts
<?xml version="1.0" encoding="utf-8" ?> <description xmlns=" targetNamespace= " xmlns:tns= " > </description>

18. UDDI
Universal Description, Discovery and Integration (UDDI, pronounced /ˈjʊdiː/) is a platform-independent, Extensible Markup Language (XML)-based registry by which businesses worldwide can list themselves on the Internet, and a mechanism to register and locate web service applications.

19. UDDI

20. UDDI

21. SOAP Security
OAuth
WS-Security