Method waitLeaderReady

ZezeJava/ZezeJava/src/main/java/Zeze/Raft/Raft.java:565–578

true，IsLeader && LeaderReady; false, !IsLeader

()

	 * false, !IsLeader
	 */
	boolean waitLeaderReady() {
		lock();
		try {
			var volatileTmp = leaderReadyFuture; // 每次只等待一轮的选举，不考虑中间Leader发生变化。
			while (isLeader()) {
				if (volatileTmp.isDone())
					return volatileTmp.get();
				await();
			}
		} finally {
			unlock();
		}
		return false;
	}

	public boolean isReadyLeader() {
		lock();