SpringMVC源码解析AbstractHandlerMethodAdapter

public abstract class AbstractHandlerMethodAdapter extends WebContentGenerator implements HandlerAdapter, Ordered {  
    private int order = Ordered.LOWEST_PRECEDENCE;  
    public AbstractHandlerMethodAdapter() {  
        // no restriction of HTTP methods by default  
        super(false);  
    }  
    @Override  
    public final boolean supports(Object handler) {  
        return (handler instanceof HandlerMethod && supportsInternal((HandlerMethod) handler));  
    }  
    protected abstract boolean supportsInternal(HandlerMethod handlerMethod);  

    @Override  
    public final long getLastModified(HttpServletRequest request, Object handler) {  
        return getLastModifiedInternal(request, (HandlerMethod) handler);  
    }  
    //提供order功能
    public void setOrder(int order) {  
        this.order = order;  
    }  
    @Override  
    public int getOrder() {  
        return this.order;  
    }  
    protected abstract long getLastModifiedInternal(HttpServletRequest request, HandlerMethod handlerMethod);  
  
}