About 2.7.0 Tag Route

[海洋]

Hi,


I'v found that 2.7.0 will support tag route. Where does the tag route be set?


Firstly, the TAG_KEY will be retrieved from the invocation. 
private <T> List<Invoker<T>> filterUsingStaticTag(List<Invoker<T>> invokers, 
URL url, Invocation invocation) {
    List<Invoker<T>> result = invokers;
// Dynamic param
String tag = StringUtils.isEmpty(invocation.getAttachment(TAG_KEY)) ? 
url.getParameter(TAG_KEY) :
            invocation.getAttachment(TAG_KEY);
The Invocation is created in InvokerInvocationHandler without attachment. I 
know that the RpcContext has the Attachment, and it will be copied to 
RpcInvocation in the filter chain, which behinds the Router. So, where to set 
it?
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws 
Throwable {
return invoker.invoke(createInvocation(method, args)).recreate();
}

private RpcInvocation createInvocation(Method method, Object[] args) {
    RpcInvocation invocation = new RpcInvocation(method, args);
    if (RpcUtils.hasFutureReturnType(method)) {
        invocation.setAttachment(Constants.FUTURE_RETURNTYPE_KEY, "true");
invocation.setAttachment(Constants.ASYNC_KEY, "true");
}
return invocation;
}