| ----------------- \ _---------------- / /
| | chain::Access | \ / | ChainMonitor |---------------
| ----------------- \ / ----------------
- | | \ /
-(as RoutingMessageHandler) v v
- \ -------------------- ---------
- -----------------> | NetGraphMsgHandler | | Event |
- -------------------- ---------
+ | | \ / |
+(as RoutingMessageHandler) v v v
+ \ -------------------- --------- -----------------
+ -----------------> | NetGraphMsgHandler | | Event | | chain::Filter |
+ -------------------- --------- -----------------
```