ex7_26.txt

j2ee core design patterns

Example 7.26 	Implementing Store Optimization

	...

	public void ejbStore() {
		try {
			// Load the mandatory data
			getResourceDAO().update(getResourceData());

			// Store optimization for dependent objects
			// check dirty and store
			// Check and store commitments
			if (skillSets != null) {
				// Get the DAO to use to store
				SkillSetDAO skillSetDAO = getSkillSetDAO();
				Iterator skillIter = skillSet.iterator();
				while (skillIter.hasNext()) {
					SkillSetTO skill = 
						(SkillSetTO) skillIter.next();
					if (skill.isNew()) {
						// This is a new dependent, insert it
						skillSetDAO.create(skill);
						skill.resetNew();
						skill.resetDirty();
					}
					else if (skill.isDeleted()) {
						// delete Skill
						skillSetDAO.delete(skill);
						// Remove from dependents list
						skillSets.remove(skill);
					} 
					else if (skill.isDirty()) {
						// Store Skill, it has been modified
						skillSetDAO.update(skill);
						// Saved, reset dirty.
						skill.resetDirty();
						skill.resetNew();
					}
				}
			}

			// Similarly, implement store optimization 
			// for other dependent objects such as 

			// BlockOutTime, ...
			...
		} catch (SkillSetException ex) {

			throw new EJBException("Reason:"+...);
		} catch (BlockOutTimeException ex) {
			throw new EJBException("Reason:"+...);
		} catch (CommitmentException ex) {
			throw new EJBException("Reason:"+...);
		}
	}

	...