in src/main/java/com/googlesource/gerrit/plugins/pubsub/local/LocalSubscriberProvider.java [53:61]
public Subscriber get(String topic, MessageReceiver receiver) throws IOException {
TransportChannelProvider channelProvider = createChannelProvider();
createTopic(channelProvider, pubSubProperties.getGCloudProject(), topic);
return Subscriber.newBuilder(getOrCreateSubscription(topic).getName(), receiver)
.setChannelProvider(channelProvider)
.setExecutorProvider(FixedExecutorProvider.create(executor))
.setCredentialsProvider(credentials)
.build();
}