java如何覆盖tapestry AlertManager

Question

我已创建扩展警报管理器： 接口

public interface AlertManagerExt extends AlertManager {
    void successCode(String messageCode, Object... args);
    void infoCode(String messageCode, Object... args);
    void warnCode(String messageCode, Object... args);
    void errorCode(String messageCode, Object... args);
}

和实施

public class AlertManagerExtImpl extends AlertManagerImpl implements AlertManagerExt {

    private final Messages messages;

    public AlertManagerExtImpl(ApplicationStateManager asm, Request request, AjaxResponseRenderer ajaxResponseRenderer,
            PerthreadManager perThreadManager, Messages messages) {
        super(asm, request, ajaxResponseRenderer, perThreadManager);
        this.messages = messages;
    }

    @Override
    public void successCode(String messageCode, Object... args) {
        success(getMessage(messageCode, args));
    }

    @Override
    public void infoCode(String messageCode, Object... args) {
        info(getMessage(messageCode, args));
    }

    @Override
    public void warnCode(String messageCode, Object... args) {
        warn(getMessage(messageCode, args));
    }

    @Override
    public void errorCode(String messageCode, Object... args) {
        error(getMessage(messageCode, args));
    }

    protected String getMessage(String code, Object... args) {
        if (args.length > 0) {
            return messages.format(code, args);
        }
        return messages.get(code);
    }
}

当我试图通过活页夹将其绑定时：

binder.bind(AlertManagerExt.class, AlertManagerExtImpl.class);

我有一个例外：

java.lang.RuntimeException: Service interface org.apache.tapestry5.alerts.AlertManager is matched by 2 services: AlertManager, AlertManagerExtImpl.  Automatic dependency resolution requires that exactly one service implement the interface.
at org.apache.tapestry5.ioc.internal.RegistryImpl.getServiceByTypeAlone(RegistryImpl.java:789)
at org.apache.tapestry5.ioc.internal.RegistryImpl.getServiceByTypeAndMarkers(RegistryImpl.java:797)
at org.apache.tapestry5.ioc.internal.RegistryImpl.getService(RegistryImpl.java:755)

我知道我可以从AlertManager复制和粘贴所有方法，而不扩展它。但可能有更好的办法吗

Answer 1

根据您的实际需要，您可以通过几种方式实现这一点。我请你阅读documentation和IoC cookbook

理解控制配置的反转非常重要，因为它是一个非常强大的模块

Answer 2

这是因为Tapestry IoC在您尝试仅按接口类型查找实现接口的所有服务时，会尝试查找这些服务。您的新AlertManagerExt还实现了AlertManager，因此存在歧义

这通常通过显式地指定服务ID或标记注释来解决，但这不适用于您的情况，因为tapestry的核心代码已经@Inject只通过接口AlertManager