如何改进Observable中的thread.sleep？

Question

我想改进observable的doOnNext块里面的睡眠。

如果有更好的方法，请推荐一下。

Observable.from(sampleList)
                .buffer(5)
                .doOnNext(first -> {
                    // first Logic
                    try {
                        Thread.sleep(500);
                    } catch (InterruptedException e) {}
                })
                .buffer(2)
                .doOnNext(second -> {
                    // second Logic
                    try {
                        Thread.sleep(500);
                    } catch (InterruptedException e) {}
                })
                .buffer(2)
                .doOnNext(third -> {
                    // third Logic
                    try {
                        Thread.sleep(500);
                    } catch (InterruptedException e) {}
                })
                .subscribe();