september 14th, 2005 nec 2005 symposium the information system of cms concepts, technology and...

September 14th, 2005

NEC 2005 Symposium

The Information System ofCMS

Concepts, Technology and Architecture

Zhechka TotevaSofia University/CERN

Dirk Samyn, Nick J. SinanisCERN


NEC 2005 SymposiumZhechka TotevaCERN - CMS Computing

Introduction

Web content serving for the CMS collaboration Agendas, Documentation, Dynamic Mailing Lists, People &

Institutes Sub-detector and Project Pages Data samples, Software Distribution and Event Catalogues Provide an integrated environment for all Collaboration

generated knowledge Some numbers

> 2’000 people, spread around the world Availability around the clock!

> 90 GBytes/day of file transfers > 18 kHits/hour

Current system dates from the first days of WWW Mostly static content Few dynamic content, often leading to unmanaged pages “One size fits it all”



iCMS – What is it? A modern web information system to replace the legacy

CMSDOC

User perspective handles the processing of different classes of CMS-specific

information Agendas, Announcements, Documentation, Mailing lists,

Meetings, News, Notes, People & Institutes, Requests Built on experience from the last 12 years running CMSDOC

Federated content management Offers personalization

Functions/Roles in the experiment Interests and working fields

System Perspective Industrial standard technologies and techniques

Java, EJB, Web services Scalable during the lifetime of the experiment

Multi-Tier architecture High-performance

Content Separation



Web Architectures

Classic architecture is a monolithic server

Simple but scales poorly

Content access Bottlenecks Synchronization

Architecture evolution is to be expected at the server side tiers

`

`

`

Web Clients

Data TierDB

FilesFiles

Presentation Tier

Web ServerHTML

Simple Dynamic Content



Building N-Tier Architectures

Presentation Tier

ApacheJSP

HTML

Data TierRDBMS

File System

Business Tier

TomcatJava Beans (EJB), RDF/RSS

Work Flow Engine

Data Access Tier

TomcatAxis Web Services

Hibernate



iCMS 4-Tier Architecture

RSS

RDF

RDF

RDF

Data Access Tier Data Tier

News

Cmspeople

Ml

MeetAnn.

Notes

Reqst

Events

IT CDS Agenda

Web services

AXIS

Hibernate/JDBC

Hibernate/Informa/JDBC

SQL/JDBC

XML

WF engine

for BPEL4

WS WS Connec

tivity

JSP WEB COMPONENT

SQL/JDBC

rws

rws

rws

rws

Java beans

creation

iCMS

JSP,HTML

JSP WEB COMPONENT

Business Tier Presentation tier



Presentation TiernotesTypeslList.jsp

<%@ page language="java" %>

<%@ taglib uri="http://iCMS.cern.ch/tomcat/iCMS-taglib" prefix="iw" %>

<%@ taglib uri="http://iCMS.cern.ch/tomcat/iCMS-WS-taglib“ prefix="iws" %>

<%@ taglib uri="http://jakarta.apache.org/taglibs/taglibs-jstl" prefix="c" %>

<iw:Form bean="types">

<iws:Notes action="getNoteType" var="types"/>

<iw:Info title="Notes Categories" show="true" hidable="false">

<c:forEach var="chitem" items="${types.items}">

<iw:InfoItem title="${chitem.id}" value="${chitem.typedescription}" />

</c:forEach>

</iw:Info>

</iw:Form>Visualization of Web Components

iCMS

JSP,HTML

JSP WEB COMPONENT

Presentation tier













</c:forEach>

</iw:Info>


Communicating withBusiness Tier

iCMS

JSP,HTML

JSP WEB COMPONENT

Presentation tier













</c:forEach>

</iw:Info>


Communicating withBusiness Tier

Procedural Logic

iCMS

JSP,HTML

JSP WEB COMPONENT

Presentation tier



Presentation Tier

Advantages of JSP Web Components High Level of Tags Reuse

Adding New Pages Modularity

Trivial Functionality Grouping Development based on page components rather than

HTML tags Coherence

It’s enough to modify a tag at a single place in order to propagate everywhere

Portability Standardized versions

notesTypeslList.jsp










</c:forEach>

</iw:Info>


Communicating with Business Tier

Procedural Logic



Business Tier - Architecture

Processes the requests from the presentation tier Implements the business logic of information processing

Workflow engine for documents submission/refereeing management

Stubs call the axis web services of the data access tier Processes the RDF/RSS responses from the data access tier Creates the java beans for the presentation tier

java function call

remote ws service call

Data access tier

RDF/RSSjava

collection

java collection

Presentation tier

JSP web component call

Business tier

JSP web component

processing classes

WF engine client libraries

Web services connectivity

classes

Java bean creation classes

WF engine for BPEL4WS

java bean



Business Tier - RDF/RSS Resource Description Framework (RDF)

W3D standard Describes documents using constraint

definitions processed by jenaRDF API

Really Simple Syndication (RSS) Standard RSS 2.0 Syndicates the updates of frequently

changing information (e.g., CMS news)

Advantages offered by RDF/RSS Unified interface

Modular Scalable

Syntax based on XML Neutral presentation to the client Universal language understood by

other tools (e.g., news aggregator)

RDF

RDF

RDF

WF engine

for BPEL4

WS WS Connec

tivity

JSP WEB COMPONENT

rws

RSS

rws

rws

rws

Java beans

creation

Business Tier



Business Tier - BPEL4WS Business Process Execution Language for

Web Services (BPEL4WS) Orchestration of web services

establishes the communication protocols

defines the business rules of the web services interactions

Applications of BPEL4WS Describe the life cycle of CMS publications

A set of business rules of the interaction between the submitter, subeditors and editors (referees)

Twister workflow engine Implements the business processes Keeps track of the states of a process

instance (publication) the communication messages exchanged

between parties participating in the publication processing

Provides client libraries to integrate with the business tier

BPEL4WS specification compliance Extendibility, portability

RDF

RDF

RDF

WF engine

for BPEL4

WS WS Connec

tivity

JSP WEB COMPONENT

rws

RSS

rws

rws

rws

Java beans

creation

Business Tier



Data Access Tier - Web Services

Web service definition Efficient serving of data query

results and data manipulation requests

Standalone service Data caching

Features Unification of the

communication interface jdbc rdf/rss

Modularity Portability

web services standard AXIS from Apache Foundation

RDF

RDF

RDF

Data Access Tier

Web services

AXIS

Hibernate/JDBC


SQL/JDBC

XML

rws

RSS

rws

rws

rws



Data Access Tier - ORM

Object-relational Mapping (ORM) Provides a seamless framework for

object/relational persistence and query

Hibernate ORM DB data treated as objects

An object property contains list of related objects

Speeds-up processing of parent-child relationships

Extendibility Supports SQL and JDBC standards Extends the SQL query features

with objects-based search criteria UML support for advanced object-

relational modeling Performance

Frequently used objects caching

RDF

RDF

RDF

Data Access Tier

Web services

AXIS

Hibernate/JDBC


SQL/JDBC

XML

rws

RSS

rws

rws

rws



Data Tier - RDBMS & FS Storage

MySQL RDBMS Persistent storage of data Ensures data consistency

domain constraints referential integrity constraints transactions

Provides multi-session data processing

Transaction isolation levels

File System (FS) storage File level storage Meta-data related to files are stored

in a database

Data Tier

News

Cmspeople

Ml

MeetAnn.

Notes

Reqst

Events

IT CDS Agenda

Hibernate/JDBC


SQL/JDBC

XML



iCMS Site Presentation



Summary

iCMS is the new generation information system of CMS N-tier architectures have been studied

A 4-tier architecture has been chosen for iCMS Advanced industrial standard technologies have been

employed in order to provide for Scalability Portability Extendibility

Status First user experiences already collected Goes into production in the coming weeks

Plans CMS shifts management

prototype for Cosmic Challenge in 2006 WIKI Community forums



Spare Slides



Advantages

Coherent presentation to the end user – jsp web components

Standard web technologies employed Web Services – provides the communication with relational databases’ persistent storage

Resource Description Framework (RDF) / Really Simple Syndication (RSS) – XML-based formats to describe the result information

Business Process Execution Language for Web Services (WPEL4WS) - describes the interaction between different web services

Unified interfaces for communication between different tiers:

JSP web components, Java beans, RDF, Axis remote calls, JDBC

Physically distributed on different servers

september 14th, 2005 nec 2005 symposium the information system of cms concepts, technology and...

Documents

requests u

numbers u

tier architecture slide

u content access

static content u

business tier slide

cms collaboration u

web services u scalable