Hello,
I have a question regarding MongoDB, Morphia, wicket-guice and injection. I try
to understand the injection of a UserDAO class in an ExampleClass. I do not
understand the following point:
The UserDAO class extends BasicDAO. BasicDAO needs a constructor with a
Datastore variable.
Question: How does wicket-guice inject the UserDAO class when the constructor
needs a Datastore?
The project would look as follows:
pom.xml
---------------------------
wicket-guice
<dependency>
<groupId>org.apache.wicket</groupId>
<artifactId>wicket-guice</artifactId>
<version>6.6.0</version>
</dependency>
User
---------------------------
@Entity("users")
public class user {
@Id
private ObjectID id;
private name;
[...]
}
public interface IUserDAO {
}
UserDAO
---------------------------
public class userDAO extends BasicDAO<User, ObjectId> implements IUserDAO {
public UserDAO(Datastore ds) {
super(ds);
}
[...]
}
MongoResource
----------------------------
public enum MongoResource {
INSTANCE;
private MongoClient mongoClient;
private MongoResource () {
mongoClient = new MongoClient(properties.getProperty("host",
properties.getProperty("port")));
}
public Datastore getDatastore() {
return new Morphia().map(User.class).createDatastore(mongoClient,"mydb");
}
}
Application
-----------------------------
public class Application extends WebApplication {
@Override
protected void init()
{
addComponentInstantiationListener(
new GuiceComponentInjector(this, new GuiceModule()));
}
}
GuiceModule
-----------------------------
public class GuiceModule extends AbstractModule
{
@Override
protected void configure()
{
// Business object bindings go here.
bind(MyDAO.class).to(UserDAO.class);
}
}
ExampleClass
-----------------------------
public ExampleClass {
@Inject
private IUserDAO userDAO;
public ExampleClass() {
super();
userDAO.doSomething();
}
}
Without injection I would initialize the UserDAO class as follows:
ExampleClass
-----------------------------
public ExampleClass {
private UserDAO userDAO;
public ExampleClass() {
super();
Datastore ds = MongoResource.INSTANCE.getDatastore();
userDAO = new UserDAO(ds);
userDAO.doSomething();
}
}
I would like to use injection. Can someone tell me how I have to do that?
That would be great.
Andre
--
Andre Schütz <[email protected]>
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