in impl/src/main/java/org/apache/rocketmq/remoting/impl/netty/ClientChannelManager.java [60:66]
Channel createIfAbsent(final String addr) {
RemotingChannelFuture cw = this.channelTables.get(addr);
if (cw != null && cw.isActive()) {
return cw.getChannel();
}
return this.createChannel(addr);
}