8:00 – 4:30 CSIP

• Taking a small detour into Hibernate, to see if that can create a Java Object that Drools can operate on.
• Some relevant articles from 2008-2009, also here
• Installing hibernate eclipse plugins from here. Well I thought I was. It appears there is a conflict with Ant. Which is funny, because the book “Harnessing Hibernate” has all their examples built with Ant. It is to laugh.
• Hmm. Ant using Maven is kind of nice. Definitely more explicitly clear. it depends on maven-ant-tasks-2.0.6.jar that needs to reside in the Ant library. And if you add a link to that library as an external jar in the Ant preferences in Eclipse, it seems to work quite well.
• Well, not quite. The 2.0.6 jar only points to the default .m2/repository. You need the 2.1.3 jar if you want that to work. And that took 2 hours. Grr. Somebody should update the Safari book code repository.
• Chapter 1
• Chapter 2
• Chapter 3

8:00 – 1:30, 3:30 -6:00  CSIP

• Ok ,now that we have working(?) code, I have something to walk through while reading the book.
• The Drools team suggests that you use the joda DateTime library. It looks pretty nice, too – http://joda-time.sourceforge.net/. They also have a bunch of other interesting libraries at http://joda.sourceforge.net/
• Setting a global value in a rule
• Java

  // Import the class
  import droolsbook.bank.service.BankingInquiryService;
  
  // create the session
  static StatelessKnowledgeSession session;
  
  // create rule engine
  KnowledgeBaseConfiguration configuration = KnowledgeBaseFactory.newKnowledgeBaseConfiguration();
  KnowledgeBase knowledgeBase = KnowledgeBaseFactory.newKnowledgeBase(configuration);
  
  // declare our global
  BankingInquiryService inquiryService = new BankingInquiryServiceImpl();
  
  // make a session
  session = knowledgeBase.newStatelessKnowledgeSession();
  
  // add the global to the session
  session.setGlobal("inquiryService", inquiryService);

• Drools rule (.drl file)

  // import
  import droolsbook.bank.service.*;
  
  // declare
  global BankingInquiryService inquiryService;
  
  // use the global in a rule (note the surrounding eval(), which can evaluate any code that returns a TRUE or FALSE).
  rule "accountNumberUnique"
      when
          $account : Account(eval(!inquiryService.isAccountNumberUnique($account)))
      then
          error(kcontext, $account);
  end

• Chapter 4
• Hmm. com.ibatis.sqlmap.client.SqlMapClient looks interesting.
• After poking around, I think I found something better. Castor appears to do XML/SQL/other(?) data binding with Java. IBM appears to have a nice set of articles.
• And Hibernate may now be able to do this as well.
• Nice data visualization using webGL
• 

8:00 – 5:00 CSIP

• Went to the customer site to fill out paperwork
• Proceeding somewhat blindly is a somewhat Droolsy direction. Documentation is pretty sucky.
• Thinking about how to use rules against a database. This might require the creation of Java classes that have the structure of the table. It’s possible that this could be done with reflection, which I haven’t used since TUMMS. Here’s the Java trail just in case: http://docs.oracle.com/javase/tutorial/reflect/
• Found the source for the book: http://code.google.com/p/droolsbook/
• Reindexing maven repositories…
• had to add the following to the droolsBookParent/pom.xml in the <dependencyManagement><dependecies> section

  <dependency>
  <groupId>org.slf4j</groupId>
  <artifactId>jcl-over-slf4j</artifactId>
  <version>1.6.0</version>
  </dependency>

• had to add the JDK to the JRE section of Eclipse Java properties. It was overriding JAVA_HOME
• Better. Maybe even good enough. The banking example is working:

  [INFO] Reactor Summary:
  [INFO]
  [INFO] Drools Book Parent ................................ SUCCESS [0.694s]
  [INFO] Banking Core ...................................... SUCCESS [3.705s]
  [INFO] Validation ........................................ SUCCESS [7.324s]
  [INFO] ETL with iBatis ................................... SUCCESS [12.815s]
  [INFO] DSL ............................................... FAILURE [4.146s]
  [INFO] Decision Tables ................................... SKIPPED
  [INFO] Ruleflow .......................................... SKIPPED
  [INFO] Stateful Rules .................................... SKIPPED
  [INFO] Complex Event Processing .......................... SKIPPED
  [INFO] Drools Flow ....................................... SKIPPED
  [INFO] Testing ........................................... SKIPPED
  [INFO] Integration ....................................... SKIPPED
  [INFO] Performance ....................................... SKIPPED
  [INFO] Sample Application ................................ SKIPPED
  [INFO] ------------------------------------------------------------------------
  [INFO] BUILD FAILURE
  [INFO] ------------------------------------------------------------------------
  [INFO] Total time: 29.097s
  [INFO] Finished at: Mon Apr 02 16:58:52 EDT 2012
  [INFO] Final Memory: 32M/199M

  [ERROR] Failed to execute goal on project dsl: Could not resolve dependencies for project droolsbook:dsl:jar:1.1-SNAPSHOT: The following artifacts could not be resolved: droolsbook:etl_iBatis:jar:tests:1.1-SNAPSHOT, droolsbook:validation:jar:tests:1.1-SNAPSHOT: Failure to find droolsbook:etl_iBatis:jar:tests:1.1-SNAPSHOT in http://www.fgmdev.com:8081/nexus/content/groups/public/ was cached in the local repository, resolution will not be reattempted until the update interval of corprepo has elapsed or updates are forced -> [Help 1]