Eivind Waaler
2003-05-21 13:43:03 UTC
Thought I'd send some information about what's been done in the
VALUEOBJECT_REFACTORING_BRANCH branch in CVS.
New features:
====================
1. Value Object support. In the build.xml, you can now specify
valueobject="true". There are two value objects for each entity, an
XXLightValue which only has fields and an XXValue which extends
XXLightValue and has relationships.
2. Entity Facade support. By specifying sessionfacade="true" in the
build.xml file, a Middlegen specific version of XDoclet entity facade
objects are generated. These can be used to access all the entities
remotely. Value objects must be generated for this to work, as all data
are transported as value objects (since local entity references can't be
passed remotely).
3. DynamicQL for JBoss. By specifying dynamicQL="true" on the <jboss>
subelement of the <cmp20> plugin, a method for dynamic JBossQL is added to
all entities:
findByDynamicQL(java.lang.String jbossql, java.lang.Object[] args)
If you're using JBoss this is really cool, because you can specify finders
runtime. Example:
String jbossql = "SELECT OBJECT(p) FROM Person p WHERE p.lastName = ?1";
Object[] arguments = new Object[1];
arguments[0] = "waaler";
Collection persons = personFacade.findByDynamicQL(jbossql, arguments);
System.out.println("persons: " + persons);
This piece of code runs the JBossQL statement on the person entity,
remotely through the person facade session bean. It returns a Collection
of PersonValue objects. How cool is that?
Known issues/limitations/problems:
====================
- Update/create on all entities must be done with the foreign key fields
set (not relationships). For example to set an address to the person:
personValue.setAddressIdFk(new Integer(1)); // works
personValue.setAddress(addressValue); // does not work
I haven't figured out a smooth solution to this.
- On getting a value object, all relationships are actually returned as
light value objects. This is due to the reentrant problem discussed on the
list earlier. There are some different solutions to this, I haven't
implemented any other yet.
====================
Please get the VALUEOBJECT_REFACTORING_BRANCH from CVS and try it out. I
have not testet it on anything but mysql + jboss 3.2.1 yet, so there might
be issues. The branch has got a separate version in the JIRA, so please
log bugs/issues/patches/whatever there:
http://jira.codehaus.org/secure/BrowseProject.jspa?id=10110
Cheers
.eivind
VALUEOBJECT_REFACTORING_BRANCH branch in CVS.
New features:
====================
1. Value Object support. In the build.xml, you can now specify
valueobject="true". There are two value objects for each entity, an
XXLightValue which only has fields and an XXValue which extends
XXLightValue and has relationships.
2. Entity Facade support. By specifying sessionfacade="true" in the
build.xml file, a Middlegen specific version of XDoclet entity facade
objects are generated. These can be used to access all the entities
remotely. Value objects must be generated for this to work, as all data
are transported as value objects (since local entity references can't be
passed remotely).
3. DynamicQL for JBoss. By specifying dynamicQL="true" on the <jboss>
subelement of the <cmp20> plugin, a method for dynamic JBossQL is added to
all entities:
findByDynamicQL(java.lang.String jbossql, java.lang.Object[] args)
If you're using JBoss this is really cool, because you can specify finders
runtime. Example:
String jbossql = "SELECT OBJECT(p) FROM Person p WHERE p.lastName = ?1";
Object[] arguments = new Object[1];
arguments[0] = "waaler";
Collection persons = personFacade.findByDynamicQL(jbossql, arguments);
System.out.println("persons: " + persons);
This piece of code runs the JBossQL statement on the person entity,
remotely through the person facade session bean. It returns a Collection
of PersonValue objects. How cool is that?
Known issues/limitations/problems:
====================
- Update/create on all entities must be done with the foreign key fields
set (not relationships). For example to set an address to the person:
personValue.setAddressIdFk(new Integer(1)); // works
personValue.setAddress(addressValue); // does not work
I haven't figured out a smooth solution to this.
- On getting a value object, all relationships are actually returned as
light value objects. This is due to the reentrant problem discussed on the
list earlier. There are some different solutions to this, I haven't
implemented any other yet.
====================
Please get the VALUEOBJECT_REFACTORING_BRANCH from CVS and try it out. I
have not testet it on anything but mysql + jboss 3.2.1 yet, so there might
be issues. The branch has got a separate version in the JIRA, so please
log bugs/issues/patches/whatever there:
http://jira.codehaus.org/secure/BrowseProject.jspa?id=10110
Cheers
.eivind