Get all beans implementing a common interface in Spring

Question

How to get a link for all beans that implement a specific common interface (e.g. Filter <TestEvent>) in Spring?

This is what I want to achieve with a minimum number of lines:

public interface Filter<T extends Event> {

    boolean approve(T event);

}


public class TestEventFilter implements Filter<TestEvent> {

    public boolean approve(TestEvent event){
        return false;
    }

}

public class EventHandler{
    private ApplicationContext context;

    public void Eventhandler(DomainEvent event) {
        // I want to do something like following, but this is not valid code
        Map<String, Filter> filters = context.getBeansOfType(Filter<event.getClass()>.class);
        for(Filter filter: filters.values()){
            if (!filter.approve(event)) {
                return;  // abort if a filter does not approve the event
            }
        }
        //...
    }

}

My current implementation uses reflection to determine if filter.approve accepts an event before it is called. For instance.

        Map<String, Filter> filters = context.getBeansOfType(Filter.class);
        for(Filter filter: filters.values()){
            if (doesFilterAcceptEventAsArgument(filter, event)) {
                if (!filter.approve(event)) {
                    return;  // abort if a filter does not approve the event
                }
            }
        }

Where makeFilterAcceptEventAsArgument does all the ugly work I'd like to slip away with. Any suggestions?

Answer 1

: " Spring ", "". , ( beans , ).

, , . , , .

- , ; doesFilterAcceptEventAsArgument. OO ( ):

protected abstract Class<E> getEventClass();

public boolean acceptsEvent(Object event) // or an appropriate class for event
{
    return getEventClass().isAssignableFrom(event.getClass());
}

, getEventClass() , , . , , .

, .

Answer 2

, , , :

    Map<String, Filter> filters = context.getBeansOfType(Filter.class);
    for(Filter filter: filters.values()){
        try {
            if (!filter.approve(event)) {
                return;  // abort if a filter does not approve the event.
            }
        } catch (ClassCastException ignored){ }
    }

.