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| |
| <document> |
| |
| <properties> |
| <title>Migrating from 2.1 to 2.2</title> |
| </properties> |
| |
| <body> |
| |
| <section name="Important note"> |
| <p> |
| The information in this HOWTO pertains to Turbine 2.2. Please refer |
| to the <a href="migrate-from-2_2-howto.html">Migrating from |
| 2.2 to 2.3</a> page for information on migating to Turbine 2.3. |
| </p> |
| </section> |
| |
| <section name="Introduction"> |
| <p> |
| This document describes the basic steps needed to migrate an |
| application written for Turbine 2.1 to Turbine 2.2 using the |
| decoupled Torque. |
| </p> |
| <p> |
| You may find that migrating to 2.2 is not all that difficult. |
| Of course, this depends quite a bit on how much of Turbine your |
| application actually uses. You may find migrating to 2.2 to be |
| quite a chore, but it is well worth the effort. Most of the |
| pain in figuring out this migration process has been documented |
| in the mailing list archives, but is summarized here for your |
| convenience. |
| </p> |
| </section> |
| |
| <section name="Cleanup"> |
| <p> |
| Start off with deleting all of the objects that Torque generated |
| for you. I am talking about om.map.* and om.Base*. You will be |
| able to regenerate them later during the migration process. |
| </p> |
| </section> |
| |
| <section name="Build and Properties Files"> |
| <p> |
| The structure of the build files used by Turbine has changed |
| quite a bit with the 2.2 release. The easiest way of obtaining |
| a reference set of property (and build files) is to install |
| version 2.2 of the TDK and generate the demo application. |
| </p> |
| <p> |
| From the demo application you should: |
| <ul> |
| <li>Merge <code>tdk-2.2/webapps/newapp/WEB-INF/conf/build.properties</code> |
| with your existing properties file.</li> |
| <li>Copy <code>build-torque.xml</code> from the demo application |
| to your build directory.</li> |
| <li>Copy <code>project-build.xml</code> from the demo application |
| to your build directory.</li> |
| <li>Merge <code>build.xml</code> from the demo application |
| to your existing build file (if you have only ever used the |
| default build file supplied with the tdk then I assume you |
| can just replace your file with the new one).</li> |
| <li>Copy <code>WEB-INF/conf/TurbineResources.template</code> and |
| <code>WEB-INF/conf/Torque.template</code>) to your application |
| and apply changes as needed (it is up to you as to how much you |
| hard code into your application template and how much you allow |
| to be processed into the resulting properties files by way of |
| <code>build.properties</code> or the other property files).</li> |
| </ul> |
| </p> |
| <p> |
| See the Torque |
| <a href="http://jakarta.apache.org/turbine/torque/properties-reference.html"> |
| Properties Reference</a> for full details of the available properties. |
| </p> |
| </section> |
| |
| <section name="Libraries"> |
| <p> |
| Turbine and Torque use updated versions of a number of |
| libraries (jar files). Take a look at the WEB-INF/lib directory |
| of the TDK sample application to see which libraries have been |
| updated and replace the files in the lib directory of your |
| application as needed. |
| </p> |
| <p> |
| Note that if you have applied local changes to Turbine itself |
| then you should ensure that your changes have made it into the |
| Turbine 2.2 and Torque 3.0 releases. If any of your changes |
| have not made it then you will need to port these changes forward |
| and build your own versions of the Turbine and Torque jar files |
| (while you are there you may as well create patches and submit |
| them to the relevant modules in Scarab so that they can be |
| included in future releases). |
| </p> |
| <p> |
| By default Torque will utilize a set of Velocity templates that |
| you need to extract from the Torque jar file (see the |
| <code>torque.templatePath</code> property). Unless you have a |
| need to alter these templates you may prefer to use these directly |
| from the jar file. To do this you need to set the |
| <code>torque.useClasspath</code> property to <code>true</code> in |
| <code>build.peoperties</code>. In any case, you should either |
| replace or delete the old versions of these templates from your |
| existing project. |
| </p> |
| </section> |
| |
| <section name="Import Statements"> |
| <p> |
| Many of your import statements will need to be changed. This is |
| due to the decoupled version of Torque. This will take care of |
| most of the changes due to refactoring. There will still be a |
| few cases (discussed later) where the methods have been changed and/or |
| moved to different classes. |
| </p> |
| <p> |
| <a href="http://jakarta.apache.org/turbine/torque/changes.html#Torque%203.0-b3"> |
| [Here]</a> is list of the most common import changes. |
| </p> |
| </section> |
| |
| <section name="Transactions and obtaining database connections"> |
| <p> |
| org.apache.turbine.util.db.DBConnection is gone. The replacement |
| is java.sql.Connection. This was a wrapper class from the |
| Connection object. It was returned when you asked for a database |
| connection. The new version of Torque will simply return a |
| Connection object. |
| </p> |
| <p> |
| org.apache.turbine.services.db.TurbineDB is gone. The replacement |
| is org.apache.torque.Torque. This was mainly used to obtain |
| database connections and the name of the default database. All |
| of this functionality is in the new class. |
| </p> |
| <p> |
| Below is an example of how you might have been obtaining database |
| connections in version 2.1. |
| </p> |
| |
| <source> |
| <![CDATA[ |
| DBConnection dbConn = null; |
| try |
| { |
| dbConn = TurbineDB.getConnection(); |
| // Do something with the connection here... |
| } |
| catch (Exception e) |
| { |
| // Either from obtaining the connection or from your application code. |
| } |
| finally |
| { |
| try |
| { |
| TurbineDB.releaseConnection(dbConn); |
| } |
| catch (Exception e) |
| { |
| // Error releasing database connection back to pool. |
| } |
| } |
| ]]> |
| </source> |
| <p> |
| Using the new version of Torque this would be rewritten as follows. |
| </p> |
| <source> |
| <![CDATA[ |
| Connection conn = null; |
| try |
| { |
| conn = Torque.getConnection(); |
| // Do something with the connection here... |
| } |
| catch (TorqueException ex) |
| { |
| // Either from obtaining the connection or from your application code. |
| Log.error(ex); |
| } |
| finally |
| { |
| Torque.closeConnection(conn); |
| } |
| ]]> |
| </source> |
| <p> |
| Support for transactions has been moved from org.apache.turbine.om.BasePeer |
| into org.apache.torque.util.Transaction. The method names have changed |
| slightly as well. Here is an example of using transactions in 2.1. |
| </p> |
| <source> |
| <![CDATA[ |
| DBConnection dbConn = null; |
| try |
| { |
| dbConn = BasePeer.beginTrasaction(TurbineDB.getDefaultDB?()); |
| someObject.save(dbConn); |
| someOtherObject.save(dbConn); |
| BasePeer.commitTransaction(dbConn); |
| } |
| catch (Exception e) |
| { |
| // Either from obtaining the connection or from your application code. |
| BasePeer?.rollbackTransaction(dbConn); |
| } |
| ]]> |
| </source> |
| <p> |
| This would now be written as shown below. |
| </p> |
| <source> |
| <![CDATA[ |
| Connection conn = null; |
| try |
| { |
| conn = Transaction.begin(Torque.getDefaultDB()); |
| someObject.save(conn); |
| someOtherObject.save(conn); |
| Transaction.commit(conn); |
| } |
| catch (TorqueException ex) |
| { |
| try |
| { |
| Transaction.rollback(conn); |
| } |
| catch (TorqueException ex2) |
| { |
| Log.error(ex2); |
| } |
| Log.error(ex); |
| } |
| ]]> |
| </source> |
| </section> |
| |
| <section name="Vector becomes List"> |
| <p> |
| Methods generated by Torque that previously had a return type of |
| <code>Vector</code> now have a return type of <code>List</code>. |
| If you have not already been doing so you should switch to |
| retrieving the results of these methods into variables declared |
| as <code>List</code>. While you are at it you might like to |
| update any of your own code to use <code>ArrayList</code> in |
| preference to <code>Vector</code>. |
| </p> |
| </section> |
| |
| <section name="Exception becomes TorqueException"> |
| <p> |
| Methods generated by Torque now throw <code>TorqueException</code> |
| rather than <code>Exception</code>. You might like to update |
| your code to match. |
| </p> |
| <p> |
| Note that the exception thrown by <code>save()</code> methods is |
| determined by the Torque property <code>torque.saveException</code> |
| which defaults to <code>Exception</code>. |
| </p> |
| </section> |
| |
| <section name="Extending Turbine User"> |
| <p> |
| See |
| <a href="http://jakarta.apache.org/turbine/turbine-2/howto/extend-user-howto.html"> |
| Extending Turbine User How-To</a> for this information. |
| </p> |
| </section> |
| |
| <section name="Changes to the OM classes"> |
| <p> |
| Read over the Torque Schema Reference to find out what to change |
| in your project-schema.xml file. The main changes are the |
| deprecation of sequence and autoIncrement idMethods and the |
| addition of the javaType attribute to column elements |
| (Torque can now work with object types). |
| </p> |
| <p> |
| If you used inheritance, you will run need to specify |
| abstract="true" for the tables which have abstract base |
| classes. When you do this, you will need to implement the |
| copy() method in your subclasses. An example is provided below. |
| </p> |
| <source> |
| <![CDATA[ |
| public <base class> copy() throws TorqueException |
| { |
| return copyInto(new <sub class>()); |
| } |
| ]]> |
| </source> |
| <p> |
| Atributes defined as primary keys are no longer generated |
| as NumberKey objects. They are now Integer or int (depending |
| on the javaType specified in project-schema.xml). |
| </p> |
| <p> |
| If you have a turbine-schema.xml file in your WEB-INF/conf |
| directory, the project-om ant task will generate all of the |
| Turbine*, BaseTurbine*, and map.Turbine* objects for you. |
| These will not be used by Turbine. They will only confuse |
| you. The best thing to do for this is to rename your |
| turbine-schema.xml file to something like turbine-schema.nogenerate. |
| </p> |
| </section> |
| |
| <section name="XML-RPC service"> |
| <p> |
| My TurbineResources.properties did not have settings to |
| configure the secure options. This caused initialization |
| of the service to fail. To fix this, I simply obtained all |
| of the configuration settings from the TurbineResources.properties |
| included with the source version. |
| </p> |
| <p> |
| The service does not listen on the loopback interface by default |
| any longer. There were no other changes that are required to get |
| this service up and running under T2.2. |
| </p> |
| </section> |
| |
| <section name="Other services"> |
| <p> |
| Intake, Security, and Scheduler all work without a problem |
| after migrating to T2.2. |
| </p> |
| </section> |
| |
| <section name="Maven"> |
| <p> |
| You may like to consider using |
| <a href="http://jakarta.apache.org/turbine/maven/">Maven</a> to |
| build your project. The document |
| <a href="http://nagoya.apache.org/wiki/apachewiki.cgi?JakartaTDK/Starting_Project_With_TDK2.2_And_Maven"> |
| Starting your project and database with TDK2.2 and Maven</a> |
| provides some information that can be adapted for this purpose |
| (jump down to the "Moving The Sample" heading for the |
| documentation relevant to an existing project). |
| </p> |
| </section> |
| |
| <section name="Updates to this document"> |
| <p> |
| This document is by no means complete or totally accurate. We welcome |
| suggestions as to how it might be improved, particularly if you have |
| just completed migrating an application by following this howto. |
| </p> |
| </section> |
| |
| </body> |
| </document> |