Overview. COMP534B Software Design. Server-side Components. Server-side Components. J2EE Platform. J2EE Containers

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1 COMP534B Software Design Server-side component programming Overview Intro to Java server-side components Java s EJBs (Enterprise Java beans) Application servers (J2EE) and web services We ll take a look at coding and deploying some simple java components as server-side web services Apache Axis (open source engine written in Java) Installing an Axis server on a servlet engine (such as Tomcat) Writing simple web services using the Axis libraries Server-side Components Server-side Components Form the basis of large scale distributed services Actual components tend to be pretty straight-forward Technologies involved in supporting them are many and varied, and things tend to get complicated Many buzzwords and acronyms :-) Issues include: Communications (many a protocol) IIOP (CORBA), ORPC (DCOM), RMI (Java), Scalability Database transaction handling Security Enterprise JavaBeans (Java s offering) Standard java components that implement various interfaces to allow them to interact and be managed by a J2EE application server Application servers are typically large, complicated and expensive beasts J2EE application server abstracts away the details of underlying services Made implicit rather than explicit via deployment descriptors Programmers use a tool to provide declarative statements that form deployment descriptors J2EE Platform A J2EE application server that is compliant with the J2EE specification must provide services and APIs for: Enterprise JavaBeans (EJB) Java Database Connectivity (JDBC) Java Servlets JavaServer Pages (JSP) Java Message Service (JMS) Java Naming and Directory Interface (JNDI) Java Transaction API (JTA) Java Mail API Java API for XML processing Java Authentication and Authorization Service (JAAS) J2EE Containers Three kinds of containers/components Client components (correlate to client containers) Web components servlets and JSPs EJB components Any or all of the containers and components may be on the same or multiple machines Communication is via Java RMI (remote method invocation) 1

2 Types of EJBs Two main types of EJBs: Session beans and Entity beans Session beans Encapsulate application logic Act as controllers for other beans Carry out tasks on behalf of a client Entity beans Represent persistent objects basically data that exists beyond a specific application s lifetime Typically stored in a relational database Persistence can be handled entirely by the container or implemented manually by the developer EJB Components Two interfaces: Home interface Defines lifecycle methods Creating, removing and finding beans Allows the container and the client to obtain a reference to a specific bean Developer writes the interface and the container generates the implementation Component interface Defines business methods callable by clients Client uses a bean s Home interface to obtain a local proxy object for the bean that implements the Component interface Proxy object hides comms plumbing i.e. RMI code Web Services Web Services Definition A Web service is a software system identified by a URI, whose public interfaces and bindings are defined and described using XML. Its definition can be discovered by other software systems. These systems may then interact with the Web service in a manner prescribed by its definition, using XML based messages conveyed by Internet protocols Key defining factor is the use of XML to describe the service and carry messages Since it is plain text, XML is easily accessible from a variety of platforms From a Java perspective a web service can be thought of as a set of functions provided by a set of Java objects available at a particular network address Success and adoption of web services depends on WSDL (Web Services Definition Language) Standards-based way of describing a Web service (Simple Object Access Protocol) XML-based wire protocol HTTP as transport UDDI (Universal Description, Discovery, and Integration) Standards-based way of publishing and locating a Web service Public UDDI registries are provided by IBM, Microsoft etc. Why Use -based Web Services? Obtaining services provided by a platform other than the one you are working can be tedious E.g. Java client accessing a DCOM service Requires a Java/COM bridge that translates JRMP (Java Remote Method Protocol) to ORPC (Object Remote Procedure Call), and vice versa Web services based on XML are easier to debug Easier to read XML than a binary stream Protocols such as are based on vendor-agnostic technology: XML, HTTP, SMTP Appeals to all vendors Toolkits are freely available to developers Disadvantages Objects can t be transmitted Can transmit simple types, data structures composed of simple types and arrays Minor performance hit due to having to marshal / unmarshal (convert) each request into relatively bulky XML text, as opposed to binaries 2

3 uses XML as the data-encoding format Not original to XML-RPC and ebxml use XML as well Consider the following Java interface: public interface Hello { public String sayhelloto(string name); } Client calling sayhelloto() would receive a personalized Hello message from the server Say we wanted to serialize the method call to XML for sending to a server, we might use a request format something like: <?xml version="1.0"?> <Hello> <sayhelloto> <name>john</name> </sayhelloto> </Hello> Root node is the interface name Hello Method and parameter names are also nodes Now we must deliver this request to the server Could create our own TCP/IP protocol, but easier just to use an existing one like HTTP Package the request into the form of an HTTP POST request and send to the server Server receives the request, decodes the XML and sends the client a response in XML Assume the response looks like: <?xml version="1.0"?> <Hello> <sayhellotoresponse> <message>hello John, How are you?</message> </sayhellotoresponse> </Hello> The root node is still the interface name Hello The node name is the method name plus the string Response Client knows which method it called, therefore to find the response it only has to look for an element with that named method plus Response This is basically the roots of Here is the same request encoded in : <-ENV:Envelope xmlns:-env= xmlns:xsi= xmlns:xsd="http://www.w3.org/1999/xmlschema"> <-ENV:Header> </-ENV:Header> <-ENV:Body> <ns1:sayhelloto xmlns:ns1="hello -ENV:encodingStyle= <name xsi:type="xsd:string">john</name> </ns1:sayhelloto> </-ENV:Body> </-ENV:Envelope> Looks more complicated, but is actually similar to what we did before document is organized into An Envelope (root node) A header section Used to encapsulate data that is not tied to a specific method Could be used to provide context knowledge such as a transaction ID or security info A body section Contains method specific info 3

4 Heavy use of XML namespaces -ENV, xsi and xsd map to standard namespaces that all documents have Hello is not a node. Now it refers to a namespace, ns1 Along with the parameter value, type info is also sent to the server Envelope s encodingstyle attribute Value informs the server of the encoding style used to encode i.e., serialize the method Server requires this info to successfully deserialize the method The response would be: <-ENV:Envelope xmlns:-env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/1999/xmlschema-instance xmlns:xsd="http://www.w3.org/1999/xmlschema"> <-ENV:Body> <ns1:sayhellotoresponse xmlns:ns1="hello -ENV:encodingStyle= <return xsi:type="xsd:string"> Hello John, How are you doing? </return> </ns1:sayhellotoresponse> </-ENV:Body> </-ENV:Envelope> Aim: to explore session-oriented component programming in Java using the Apache Axis libraries Due: Friday, 22nd September Learning goals: Understanding web services Some experience with programming server-side components Some experience with using a widely available library Use Axis libraries to develop components for a web service that simulates an online bookstore E.g. like Amazon but much, much, much simpler :-) Requirements a client that accesses your web service will be able to: Obtain a list of books by genre Add books to their shopping cart See how many items are in their shopping cart View their shopping cart Proceed to checkout Get a summary of their purchases See the total cost Files and in memory data structures are sufficient for holding the book catalogue and shopping cart contents You will need to: Design a programmatic interface to your online bookstore Generate server-side implementation skeleton, client-side stubs, WSDL and WSDD descriptors using the tools provided with Axis Find out how Axis supports Session scoped services Fill in the implementation for the generated files Write a client program to access your web service Deliverables A ready to deploy jar file that I can install on the Axis SimpleServer or on the Axis web app Source code, WSDL and WSDD files User docs Design write up Including description of the approach taken, assumptions made, program structure, algorithms, class hierarchy etc. An elegant, well designed system that meets the requirements can achieve a grade of A 4

5 Extra credit (some ideas) Having finite stock and allowing an admin client to restock the bookstore Using a web-based Servlet or JSP as a client In this case your entire system should be able to be deployed on the Tomcat Servlet engine Using a database instead of in memory data structures for book and cart info Providing persistence beyond the session i.e. allow users to save the state of their cart Would require a login procedure 5

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