I have a function that returns void
public interface IProductService {
void delete(String id);
}
Generic method
public interface IRequestHandler<C , R> {
R handler(C c);
Class<C> commandType();
}
Implementation of generic interface
@Singleton
public record DeleteProductCommandHandler(IProductService iProductService)
implements IRequestHandler<DeleteProductCommand, Void> {
@Override
public Void handler(DeleteProductCommand deleteProductCommand) {
return iProductService.delete(deleteProductCommand.id);
}
@Override
public Class<DeleteProductCommand> commandType() {
return DeleteProductCommand.class;
}
}
How can I use void in IRequestHandler<DeleteProductCommand, Void> so that I can map void from iProductService.delete(deleteProductCommand.id);
Just return null:
@Override
public Void handler(DeleteProductCommand deleteProductCommand) {
iProductService.delete(deleteProductCommand.id);
return null;
}
Update the IProductService::delete method to return something meaningful, e.g. a boolean value like Collection::remove does:
public interface IProductService {
boolean delete(String id);
}
@Singleton
public record DeleteProductCommandHandler(IProductService iProductService)
implements IRequestHandler<DeleteProductCommand, Boolean> {
@Override
public Boolean handler(DeleteProductCommand deleteProductCommand) {
return iProductService.delete(deleteProductCommand.id);
}
@Override
public Class<DeleteProductCommand> commandType() {
return DeleteProductCommand.class;
}
}