8th sakai conference4-7 december 2007 newport beach extending sakai cle to websphere and db2 mr....
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8th Sakai Conference
4-7 December 2007Newport Beach
Extending Sakai CLE Extending Sakai CLE to WebSphere and DB2to WebSphere and DB2
Mr. Marty Banting,Sr. Software Engineer, IBM
Mr. Howard Baker, Executive Project Manager, IBM
Mr. John Bush, Development Manager, rSmart
Mr. Earle NietzelSoftware Engineer, Marist College
Mr. Austin Schilling,IT Executive Consultant, IBM
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AgendaAgenda
• Amsterdam 2007 “recap”• Collaboration Team and Environment• Application Server and Database
Considerations• Production at Marist College• Sakai Community Availability• Next Steps
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Marist College, rSmart, IBM collaboration on Marist College, rSmart, IBM collaboration on Enterprise Sakai Enterprise Sakai June 12, 2007June 12, 2007
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MARIST COLLEGEMARIST COLLEGE• We are NOT a large research university! • Founded 1929 – small complex liberal
arts college• Approximately 5700 FTE student
population• 200 full-time faculty, 500 part-time• Long history of incorporating technology
into the teaching and learning process
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8th Sakai Conference
4-7 December 2007Newport Beach
Why do we need an Why do we need an extensible solution?extensible solution?
Answer: We’ve learned our lesson from the past…
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Learning from the past…Learning from the past…
• In 1996 the digital horizon was foggy…• We have a better view today… watch out!• Use and production of digital media will grow
exponentially over next decade:– Electronic portfolios (oh yeah…“for life”)– Rich media learning objects (IVT Demo)– IdentityQuest Project (Podcasting Demo)– Next Up: Mobile authoring tools?
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Colleges and Universities
Marist College Evolving Learning GridMarist College Evolving Learning Grid
K-12 DistrictState and
Local Consortia
Museums, science
centers, etc.
Certification Exams
Online Courses
“Raw” Video Content
Student content
Schema for Provisioning the Sharing of Resources/ToolsSchema for Provisioning the Sharing of Resources/Tools
Sakai Repository
NSF MM Grid
RPI, Lehigh,,Geneseo
Greystone NYSTAR CCODC
NSF IDCP
FDR
Sewall-Belmont
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Marist/IBM Joint StudyMarist/IBM Joint Study
• Well Established Relationship, First Project – 1988• Living Lab for New Technologies
– Research projects, IBM Academic Initiative support, Marist grant initiatives
• IBM program manager provides overall project management– IBM researchers, developers, business execs, and
Marist faculty, IT staff, and students collaborate on numerous projects
• Marist students hired as IBM interns– Opportunities for full-time positions
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Marist Sakai GoalsMarist Sakai Goals
• How do we create a:– Standards based, – Capacity/Performance scalable, – Technology Extensible, – version of the Sakai CLE capable of handling future
business and application needs – in a Services based infrastructure?
• How can this vision be realized with the Sakai CLE deployment within the existing Joint Study infrastructure of:– WebSphere Application Servers, and– DB2 9 pureXML Technology Database?
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Marist – rSmart – IBM SupportMarist – rSmart – IBM Support
• QA environment running DB2 and WAS will be live in September with several “flavors” of Sakai.
• Marist will also be contributing several QA resources for testing activities
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Global CampusStudents
EducatorsAdministrators
Customized Portals
App 1
App 1
App 2
App 2
App 3
App 3
Collaborative Learning Environment
Sakai Tools &DevelopmentEnvironment
Distributed Environment
Core Services: content, user, security, site
Core Infrastructure
Sakai Vision (2005)
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Extending CLE Infrastructure (2007)Extending CLE Infrastructure (2007)Global Campus
StudentsEducators
Administrators
Customized Portals
App 1
App 1
App 2
App 2
App 3
App 3
Collaborative Learning Environment
Sakai CLE v2.4.1rSmart Distribution
Core Services: content, user, security, site
-X-Platform O/S -Fedora, other Linux, Windows-Tomcat Application Server-My SQL Database + Others
-X-Platform O/S - Slackware, RedHat, SuSE - WebSphere Application Server - DB2v9 SQL/XML Database
Relational Databases File Systems
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Collaboration TeamCollaboration Team• IBM
– Marty Banting– Alexander Reynolds– Robert Gilnack– Michael Ardizonne– Daniel Herman– Daniel Miller– Howard Baker– Austin Schilling
• rSmart– John Bush– Michael Sanders– Tony Potts
• Marist College– Earle Nietzel– John Digilio– Josh Baron
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Marist iLearnODC HistoryMarist iLearnODC History
• Previous porting efforts included Sakai 2.2.2 and 2.3.1.• rSmart Sakai CLE 2.4 was next to be ported.• July & August
– Sakai 2.4 port Development phase• September & October
– Merged in Sakai 2.4.1– Testing phase
• November – UAT phase
• December – Migrate IBM course to into production
• Work in Progress
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A Collaborative EffortA Collaborative Effort
• rSmart focused efforts on DB2• IBM / Marist Joint Studies focused on Websphere
• Weekly Checkpoint Meetings• Daily status calls• Scheduled builds• rSmart Jira
SakairSmart Sakai CLErSmart Sakai CLE
WAS/DB2 port(iLearnODC)
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Porting EnvironmentPorting Environment
• Development & Build Tools– Eclipse– Rational Application
Developer– Rational Software
Architect– Maven, Subversion
• Testing– IBM
• Linux Blades– Slackware, SuSE v9– Apache Tomcat– MySQL– WebSphere v6.1.09– DB2 v9.3
– rSmart• Jira• SVN
– Marist College• SVN
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Tool ListTool List
• Blogger• Samigo• Announcements• Calendar• Melete• Gradebook• OSP Tools• Message Center• Site Stats
• Site Info• Assignments• Syllabus• Roster• Profile• User Membership• rWiki• … and more!
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The ChallengesThe Challenges
• Team members relatively new to Sakai• No proper debugging environment• Collaborative effort with a distributed team
• Issues– Tomcat vs. Websphere related: 33– Sun vs. IBM JDK/JRE related: 8 – DB2 related: 35
• Time to analyze and fix: ½ hour to 1.5 weeks
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Porting for WebspherePorting for Websphere
• Goal is to create a single codebase for both Tomcat and Websphere
• Strived to make modifications app server independent
• If not, then we used– Logical ‘if’ in Java code to check app server flag
in sakai.properties– Websphere specific versions of xml/property
config files
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Websphere Porting IssuesWebsphere Porting IssuesDifferences in JDK/JREDifferences in JDK/JRE
• XML– Referencing vendor specific implementations
eg. “com.sun.org.apache.xerces.internal.parsers.SAXParser”
– Null attributes handled differently on XML document to string conversions
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Websphere Porting IssuesWebsphere Porting IssuesDifferences in JDK/JREDifferences in JDK/JRE
• JSP– Quotes handled differently in JSP compilation
<jsp:include page="<%= (String)request.getAttribute("_body")%>" />
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• Deployment Descriptors– Tomcat is much more lenient with invalid
deployment descriptors• If a web.xml file does not match the servlet
specification it overlooks the error and allows the web application to function normally
– WebSphere is much more strict• Will not allow an application to be installed unless
there are no errors in the web.xml file
Websphere Porting IssuesWebsphere Porting IssuesWAS vs. TomcatWAS vs. Tomcat
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Websphere Porting IssuesWebsphere Porting IssuesWAS vs. TomcatWAS vs. Tomcat
• Redirection / Navigation Issues– in Tomcat:
getContextPath() = /osp-portal/tool/197c330a-8baf-4c0b-0018-3741f1eb3e87
In Websphere:request.getContextPath() = /osp-portal
– Affects context.redirect calls eg. context.redirect("sakai.filepicker.helper/tool")
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DB2 Porting IssuesDB2 Porting Issues• Work Involved:
– Creating db2 versions of all sql/ddl scripts– Reworking issues from core services – Hibernate Complications– Deal with non-standard persistence mechanisms in some
tools (jforum and blogger)
• Design Goals – one code base must support DB2 plus mysql and oracle – isolate changes
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Core ServicesCore Services
– No vendor specific abstraction in Sakai for dealing with vendor specific issues.
– End up with code like this:
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if ("oracle".equals(m_sqlService.getVendor())) {...} else if ("mysql".equals(m_sqlService.getVendor())) { ...} else if ("db2".equals(m_sqlService.getVendor())) { ...}
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For 2.5 For 2.5 • Core Services delegate to injected SQL
helpers (SAK-8706)
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public interface ClusterServiceSql { String getListExpiredServers(long timeout);...}public class SakaiClusterServiceSqlOracle extends SakaiClusterServiceSqlDefault{ public String getListExpiredServers(long timeout) { return "select SERVER_ID from SAKAI_CLUSTER where SERVER_ID != ? and UPDATE_TIME < (CURRENT_TIMESTAMP - " + ((float) timeout / (float) (60 * 60 * 24)) + " )";}}public class SakaiClusterServiceSqlMySql extends SakaiClusterServiceSqlDefault{ public String getListExpiredServers(long timeout) { return "select SERVER_ID from SAKAI_CLUSTER where SERVER_ID != ? and UPDATE_TIME < CURRENT_TIMESTAMP() - INTERVAL " + timeout + " SECOND";}
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Refactor StatusRefactor Status
• Completed for event, content, cluster, site, user, authz, and db
• Microsoft SQL Server implementations contributed (SAK-7002)
• DB2 still left to do, for 2.6 ?
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Hibernate and DB2Hibernate and DB2
• length of index names (18 characters for DB2)
• binary type• type mismatches in a few Samigo queries
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DB2 DialectDB2 Dialect• Good place for dealing with how Hibernate
maps its types to the vendor• Can enforce column length limitations
• Doesn’t provide a solution to all our problems....
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Hibernate UserTypesHibernate UserTypes
• Interface which allows you to control how a data element maps from the object model to the database and back
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public Object nullSafeGet(ResultSet resultSet, String[] names, Object owner) throws HibernateException, SQLException { final Object object; final Integer bigInt = resultSet.getInt(names[0]); if (bigInt == null) { return null; } return bigInt.toString(); } public void nullSafeSet(PreparedStatement statement, Object value, int index) throws SQLException { final String strValue = (String) value; if (strValue == null) { statement.setNull(index, Types.BIGINT); } else { statement.setInt(index, Integer.valueOf(strValue)); } }
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Transforming hbm’sTransforming hbm’s
• Modified AdditionalHibernateMappingsImpl to apply a vendor specific xsl transformation to the hbm’s
• This re-writes the hbm’s at runtime, “injecting” our custom UserTypes.
• This avoids hacking up the hbms, with only a one line code change to this file.
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Tomcat
webapps/
Building & DeployingBuilding & Deploying
warwarwarwar
componentscomponentscomponentscomponents
jar
components/
shared/lib/
jarjarjar
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installedApps/
Websphere
Building & DeployingBuilding & Deploying
warwarwarwar
componentscomponentscomponentscomponents
jar
components/
shared/lib/
jarjarjar
EAR
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Build ProcessBuild Process
• Design Goals– Build process for Websphere as easy as Tomcat– Leverage existing build process with Maven 1.0.2
• Differences from Tomcat build– Copies Websphere specific XML and property files pre-
compilation– Packages the WAR files into an EAR file– Copies components and shared libs to appropriate
directory
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Building ProcessBuilding Process
• New ‘was’ module– starting point for Websphere build– contains overlay directory with the Websphere specific XML and
property files– Gets copied into source pre-compilation
• New ‘ear’ project within ‘was’ module– utilizes Maven EAR plugin– project.xml specifies WAR dependencies
• New property (was.sakai_shared.home) in build.properties specifies where to deploy components and shared library files
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Deployment ProcessDeployment Process
• Deployed via Websphere Admin Console– Web based application for Websphere
management
• Setup shared library pointing to components and shared lib directory
• Deploy as EAR file
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Marist iLearnODC Production StatusMarist iLearnODC Production Status
• Final Testing near completion• January 2008
– System Z Networking course online
• March 2008 – 2 new courses online– Prepare to migrate Marist Courses
• September 2008– Sakai 2.4.1 production at Marist
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Best practicesBest practices
• Use persistence frameworks• Consider the web framework• Don’t hard code implementations• Validate against specification
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Next StepsNext Steps
• Form Platform Support WG• Refactor DB2 work to use new SQL helpers
in 2.5• Refactor/revisit some Websphere fixes• Establish better development environment
for Websphere• Contribute low hanging fruit ASAP• Increase adoption of Sakai
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Q & AQ & A
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8th Sakai Conference
4-7 December 2007Newport Beach
Technical ContactsTechnical Contacts
John Bush ([email protected])Marty Banting ([email protected])Earle Nietzel ([email protected])
Austin Schilling ([email protected])Howard Baker ([email protected])