我有一個回傳 void 的函式
public interface IProductService {
void delete(String id);
}
通用方法
public interface IRequestHandler<C , R> {
R handler(C c);
Class<C> commandType();
}
通用介面的實作
@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;
}
}
我如何使用 void inIRequestHandler<DeleteProductCommand, Void>以便我可以從中映射 voidiProductService.delete(deleteProductCommand.id);
uj5u.com熱心網友回復：
選項1：
只需回傳null：
@Override
public Void handler(DeleteProductCommand deleteProductCommand) {
iProductService.delete(deleteProductCommand.id);
return null;
}
選項 2：
更新IProductService::delete方法以回傳一些有意義的東西，例如boolean像Collection::remove這樣的值：
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;
}
}
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