Function getGeneration

fdbclient/PaxosConfigTransaction.actor.cpp:223–228

	                             Optional<Version> const& lastSeenLiveVersion = {})
	  : ctis(ctis), lastSeenLiveVersion(lastSeenLiveVersion) {}
	Future<ConfigGeneration> getGeneration() {
		if (!getGenerationFuture.isValid()) {
			getGenerationFuture = getGenerationActor(this);
		}
		return getGenerationFuture;
	}
	bool isReady() const {
		return getGenerationFuture.isValid() && getGenerationFuture.isReady() && !getGenerationFuture.isError();
	}