多线程环境下添加EventProcessor报错

[xzc-coder]

Describe the bug
当多线程环境下添加EventProcessor时，会报数组越界异常

Expected behavior

当多线程环境下调用com.alipay.remoting.rpc.RpcClient#addConnectionEventProcessor 应该正常添加

Actual behavior

当多线程环境下调用com.alipay.remoting.rpc.RpcClient#addConnectionEventProcessor 报数组越界异常

Steps to reproduce

Minimal yet complete reproducer code (or GitHub URL to code)

com.alipay.remoting.ConnectionEventListener#addConnectionEventProcessor

ArrayList不是线程安全的

Environment

• SOFABolt version:1.6.5
• JVM version (e.g. java -version):1.8
• OS version (e.g. uname -a):windows
• Maven version:3.6.2
• IDE version:idea 2020

[chuailiwu]

Looks like not considered concurrency，can you fix it？

[chuailiwu]

has fixed by #321

[OrezzerO]

PR #321 's unit test can not reproduce the bug. So i wonder there may be other bugs in this situation.