Web services ja SOAP

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Web services ja SOAP

• Enn Õunapuu
• Tallinn Technical University
• enn_at_cc.ttu.ee
• 372 050 97720

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Content

• Introduction
• Software component
• BIT component
• Web service
• Message, state, contract, policies
• Service agent
• System architecture
• Näited

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SOAP

• SOAP stands for Simple Object Access Protocol
• SOAP is a communication protocol
• SOAP is for communication between applications
• SOAP is a format for sending messages
• SOAP is designed to communicate via Internet
• SOAP is platform independent
• SOAP is language independent
• SOAP is based on XML
• SOAP is simple and extensible
• SOAP allows you to get around firewalls
• SOAP will be developed as a W3C standard

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lt_at_ page import"java.net.URL" gtlt_at_ page
import"javax.xml.rpc.Call" gtlt_at_ page
import"javax.xml.rpc.namespace.QName" gtlt_at_
page import"org.apache.axis.client.Service"
gtltString firstName request.getParameter("fir
stName")String lastName request.getParameter("
lastName")Service service new Service(new
URL("http//localhost/soapXarch/jsp2asp/ASPSoapSer
vice.wsdl"),new QName("http//tempuri.org/wsdl/",
"ASPSoapService"))Call call
service.createCall(new QName("ContactSoapPort"),
new QName("getAddress"))String address
(String) call.invoke(new Object firstName,
lastName)gt
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public class Contactpublic String
getAddress(String first, String last)String
addresstryClass.forName("sun.jdbc.odbc.JdbcO
dbcDriver")Connection conn DriverManager.getCo
nnection("jdbcodbcmyodbc")Statement stmt
conn.createStatement()String sql "select
address from people where firstname '" first
"' and lastname '" last "'"ResultSet rs
stmt.executeQuery(sql)if (rs.next())address
rs.getString("address")elseaddress "No
Address was found with those names"catch
(Exception e)address e.getMessage()retur
n address
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Software component
A software component is a unit of composition
with contractually specified interfaces and
context dependencies only. A software component
can be deployed independently and is subject to
composition by third parties
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BIT component

• A BIT component is a component with one or more
  test interfaces that increase the testability of
  the component. Inspiration to BIT components
  comes from complex integrated electronic circuits
  that often have tests built in to make them
  testable.

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Web service

• Software services are discrete units of
  application logic that expose message-based
  interfaces suitable for being accessed across a
  network.

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Message, state, contract, policies

• In the service model presented here, the service
  is defined purely by the messages it will accept
  and produce, including the sequencing
  requirements for those messages.
• Service-to-service communication follows a
  contract, and by making this contract explicit it
  is possible to change one service implementation
  without compromising the interaction.
• Services need to be managed and secured. A policy
  consists of a set of rules, and each rule applies
  to an aspect of the run-time behavior
• Services manage state this state is the very
  reason for their existence. Services guard this
  state and they ensure through their business
  logic that it is kept consistent and accurate.

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Service agent

• A service agent is a service that helps you work
  with other services. Often supplied by the
  provider of the target service, the agent runs
  topologically close to the application consuming
  the service. It helps both to prepare requests to
  a service and to interpret responses from the
  service.

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System architecture
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Näited

• localhost/agent/featurescomputer.htm
• localhost/JavaAaspSoap/StartJava.htm
• localhost/JavaAaspSoap/StartASP.htm

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• Thank You!!!