On Mon, 19 Mar 2012 16:04:24 -0300, Ferran Maylinch
<ferranmayli...@gmail.com> wrote:
Hello,
Hi!
We have 6 "child" services that extend a "parent" service class. This
parent service class has 3 dependencies that are only needed in methods
inside that parent class. How would we configure these services?
Exactly the way you would in other scenarios: field inject (@Inject) or
constructor injection (my preferred).
One solution would be to add 3 innecessary parameters to the constructor
of each "child" service:
They aren't unnecessary at all. You're subclassing a class, let's call it
P, and P needs X, Y and Z. The subclasses of P *are* P instances, so they
do depend on P's dependencies. Just pass the parent dependencies in the
super() call to the parent constructor.
class Child extends P {
...
public Child(X x, Y y, Z z, ChildDependency childDependency) {
super(x, y, z);
this.childDependency = childDependency;
}
}
--
Thiago H. de Paula Figueiredo
Independent Java, Apache Tapestry 5 and Hibernate consultant, developer,
and instructor
Owner, Ars Machina Tecnologia da Informação Ltda.
http://www.arsmachina.com.br
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