I have an interface as following:
public interface Solver {
void execute(final String definition);
}
I have several solver implementations. For example:
@Qualifier("naive")
@Service
public class NaiveSolver implements Solver {
@Override
public void execute(final String definition) {
}
}
@Qualifier("optimal")
@Service
public class OptimalSolver implements Solver {
@Override
public void execute(final String definition) {
}
}
Now, in my database I have the data for these solvers as following:
type: textual - examples: simple, naive
definition: textual
When fetching this data, I need to map the type column to the actual service instance, so it can solve the provided definition.
So, my question boils down to this: how can I, given a type string, get the instance of the corresponding Solver service instance of which the qualifier is equal to that type? I believe that @Autowired cannot be used here, as I need to find beans dynamically at runtime.
Since Spring 4 you can autowire multiple implemetations into a Map where bean qualifier is a key, and the bean itself is a value
@Autowired
private Map<String, Solver> solvers;
void doStuff() {
String type = ... // obtain type
Solver solver = solvers.get(type);
solver.execute(...)
}
Update
Correct way of naming a bean is not
@Qualifier("naive")
@Service
but
@Service("naive")
@Qualifier is used along with @Autowired to ensure the correct bean is injected
@Autowired
@Qualifier("naive")
private Solver naiveSolver;