public ShenyuServiceInstanceLists get(final String contextPath) {
        try {
            return cache.get(contextPath);
        } catch (ExecutionException e) {
            throw new ShenyuException(e.getCause());
        }
    }
Get shenyuServiceInstanceList.

@param contextPath contextPath
@return ShenyuServiceInstanceLists instances
shenyu-plugin/shenyu-plugin-proxy/shenyu-plugin-rpc/shenyu-plugin-grpc/src/main/java/org/apache/shenyu/plugin/grpc/cache/ApplicationConfigCache.java