@zonghaishang
I simply read the code.
@version 2.7.0
```java
private Optional<List<Router>> toRouters(List<URL> urls) {
if (urls == null || urls.isEmpty()) {
return Optional.empty();
}
List<Router> routers = new ArrayList<>();
for (URL url : urls) {
if (Constants.EMPTY_PROTOCOL.equals(url.getProtocol())) {
continue;
}
String routerType = url.getParameter(Constants.ROUTER_KEY);
if (routerType != null && routerType.length() > 0) {
url = url.setProtocol(routerType);
}
try {
######### Router looks like a single extension rather than The Filter Design
Pattern############
Router router = routerFactory.getRouter(url);
if (!routers.contains(router)) {
routers.add(router);
}
} catch (Throwable t) {
logger.error("convert router url to router error, url: " + url,
t);
}
}
return Optional.of(routers);
}
```
[ Full content available at:
https://github.com/apache/incubator-dubbo/issues/1861 ]
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