Example 8.19 Implementing Lazy Loading Strategy

...
public Collection getSkillSetsData() {
throws SkillSetException {
  checkSkillSetLoad();
  return skillSets;
}

private void checkSkillSetLoad() 
throws SkillSetException {
  try {
    // Lazy Load strategy...Load on demand
    if (skillSets == null)
      skillSets = 
        getSkillSetDAO(resourceId).loadAll();
  } catch(Exception exception) {
    // No skills, throw an exception 
    throw new SkillSetException(...);
  }
}

...

public void ejbLoad() {
  try {
    // load the resource info from
    ResourceDAO resourceDAO = new 
      ResourceDAO(employeeId);
    setResourceData((ResourceVO)resourceDAO.load());
      
    // If the lazy loaded objects are already
    // loaded, they need to be reloaded.
    // If there are not loaded, do not load them
    // here...lazy load will load them later.
    if (skillSets != null) {
      reloadSkillSets();
    }
    if (blockOutTimes != null) {
      reloadBlockOutTimes();
    }
    ...
    throw new EJBException("Reason:"+...);
  }
}


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