1. non-simplify mode:
```
dubbo://120.0.0.1:20880/org.apache.dubbo.demo.DemoService?key=value
```
the store path of ZK will be: `/dubbo/porg.apache.dubbo.demo.DemoService/url`

2. simplify mode:
```
dubbo://120.0.0.1:20880/org.apache.dubbo.demo.DemoService?key=value
```
the store path of ZK will be: `/dubbo/porg.apache.dubbo.demo.DemoService/url`

3. simplify mode with path specified:
```
dubbo://120.0.0.1:20880/path-value?key=value
```
the store path of ZK will be: `/dubbo/path-value/url`
private final Invoker<T> originInvoker;
        private Exporter<T> exporter;
        private URL subscribeUrl;
        private URL registerUrl;
        public ExporterChangeableWrapper(Exporter<T> exporter, Invoker<T> originInvoker) {
            this.exporter = exporter;
            this.originInvoker = originInvoker;
        }
        public Invoker<T> getOriginInvoker() {
            return originInvoker;
        }
        @Override
        public Invoker<T> getInvoker() {
            return exporter.getInvoker();
        }
        public void setExporter(Exporter<T> exporter) {
            this.exporter = exporter;
        }
        @Override
        public void unexport() {
            String key = getCacheKey(this.originInvoker);
            bounds.remove(key);
            Registry registry = RegistryProtocol.INSTANCE.getRegistry(originInvoker);
            try {
                registry.unregister(registerUrl);
            } catch (Throwable t) {
                logger.warn(t.getMessage(), t);
            }
            try {
                NotifyListener listener = RegistryProtocol.INSTANCE.overrideListeners.remove(subscribeUrl);