gRPC - Debug - Channel ManagedChannelImpl was not shut down properly

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问题描述
解决方案（可能的）
参考文献

问题描述

生产代码报错：

2022-10-31T09:06:46,530 [portRiskService-1002-2950@168-63-70-238:8] ERROR io.grpc.internal.ManagedChannelOrphanWrapper - *~*~*~ Channel ManagedChannelImpl{logId=7, target=168.63.18.186:50057} was not shutdown properly!!! ~*~*~*
    Make sure to call shutdown()/shutdownNow() and wait until awaitTermination() returns true.
java.lang.RuntimeException: ManagedChannel allocation site
        at io.grpc.internal.ManagedChannelOrphanWrapper$ManagedChannelReference.<init>(ManagedChannelOrphanWrapper.java:93)
        at io.grpc.internal.ManagedChannelOrphanWrapper.<init>(ManagedChannelOrphanWrapper.java:53)
        at io.grpc.internal.ManagedChannelOrphanWrapper.<init>(ManagedChannelOrphanWrapper.java:44)
        at io.grpc.internal.ManagedChannelImplBuilder.build(ManagedChannelImplBuilder.java:596)
        at io.grpc.internal.AbstractManagedChannelImplBuilder.build(AbstractManagedChannelImplBuilder.java:261)
        at com.huatai.quant.history.request.RiskReqHandler.<init>(RiskReqHandler.java:100)
        at com.huatai.quant.service.PortRiskNatsService.riskReqHandler(PortRiskNatsService.java:453)
        at com.huatai.nats.api.impl.client.Client.lambda$subscribe$0(Client.java:306)
        at io.nats.client.impl.NatsDispatcher.run(NatsDispatcher.java:98)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)

源码：

每来一个请求，都会new一个这个RiskReqHandler,那么每次都会新建这样一个channel

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解决方案（可能的）

注意：该方案并没有实践验证，只是理论

每次用完channel后，手动shutdown。

shutdown()是初始化一个“秩序井然”的关闭操作 -- 意味着当前已经存在的调用preexisting call会继续，担心新调用new call会被立刻取消

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参考文献

Channel ManagedChannelImpl was not shut down properly：https://stackoverflow.com/questions/57481760/channel-managedchannelimpl-was-not-shut-down-properly#

GRPC简介：https://www.cnblogs.com/resentment/p/6714610.html