naming/src/main/java/com/alibaba/nacos/naming/core/v2/client/manager/impl/EphemeralIpPortClientManager.java [90:101]:
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    public boolean clientDisconnected(String clientId) {
        Loggers.SRV_LOG.info("Client connection {} disconnect, remove instances and subscribers", clientId);
        IpPortBasedClient client = clients.remove(clientId);
        if (null == client) {
            return true;
        }
        boolean isResponsible = isResponsibleClient(client);
        NotifyCenter.publishEvent(new ClientEvent.ClientDisconnectEvent(client, isResponsible));
        client.release();
        NotifyCenter.publishEvent(new ClientOperationEvent.ClientReleaseEvent(client, isResponsible));
        return true;
    }
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naming/src/main/java/com/alibaba/nacos/naming/core/v2/client/manager/impl/PersistentIpPortClientManager.java [79:90]:
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    public boolean clientDisconnected(String clientId) {
        Loggers.SRV_LOG.info("Persistent client connection {} disconnect", clientId);
        IpPortBasedClient client = clients.remove(clientId);
        if (null == client) {
            return true;
        }
        boolean isResponsible = isResponsibleClient(client);
        NotifyCenter.publishEvent(new ClientEvent.ClientDisconnectEvent(client, isResponsible));
        client.release();
        NotifyCenter.publishEvent(new ClientOperationEvent.ClientReleaseEvent(client, isResponsible));
        return true;
    }
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