Enpower SpiderSDK with Master/Agent mode.

1 build a RPC framewrok using Netty.
2 build Master/Agent with the framework.

1 classic cs mode:
client --> request rpc --> server --> response rpc --> client
2 request transmit mode:if server can't handle the request,it will find one of the so-called providers to handle request.
client --> request rpc --> server --> request rpc --> providers(client) --> response rpc --> server --> response rpc --> client

1 agent register to master
2 agent send heartbeat to master
3 agent report self status(working fine,blocked,switching proxy) to master
4 agent request proxy from master
5 master monit all agents's states

check out the project to know details~