- [ ] I have searched the
[issues](https://github.com/apache/incubator-dubbo/issues) of this repository
and believe that this is not a duplicate.
- [ ] I have checked the
[FAQ](https://github.com/apache/incubator-dubbo/blob/master/FAQ.md) of this
repository and believe that this is not a duplicate.
### Environment
* Dubbo version: Latest
* Operating System version: win10
* Java version: 1.8
### Steps to reproduce this issue
```java
private static <T> Invoker<T> buildInvokerChain(final Invoker<T> invoker,
String key, String group) {
Invoker<T> last = invoker;
List<Filter> filters =
ExtensionLoader.getExtensionLoader(Filter.class).getActivateExtension(invoker.getUrl(),
key, group);
if (!filters.isEmpty()) {
for (int i = filters.size() - 1; i >= 0; i--) {
final Filter filter = filters.get(i);
final Invoker<T> next = last;
last = new Invoker<T>() {
...........
@Override
public Result invoke(Invocation invocation) throws
RpcException {
return filter.invoke(next, invocation);
}
...........
};
}
}
return last;
}
```
it will creates the same number of the **anonymous Invoker class** as **filters
size** when refer() or export(...) every time, it's a linked structure
Pls. provide [GitHub address] to reproduce this issue.
### Expected Result
use one **anonymous Invoker class** to instead of it
use one **for** call to instead of **linked** call
### Actual Result
NONE
[ Full content available at:
https://github.com/apache/incubator-dubbo/issues/2726 ]
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