Executors 之 ScheduledExecutorService 代码片断

//1 thread for this pool private final ScheduledExecutorService healthCheckScheduler = Executors.newScheduledThreadPool(1); public void scheduleHealthCheck() {        //此处使用lambda        healthCheckScheduler.scheduleAtFixedRate(() -> {            HealthReport healthReport = createHealthReport();            latestHealth = new Health(healthReport);            if (healthReport.isAvailable()) {                String message = XXXXFormatter.toJson("health", 1);                log.info(message);                XXXClient.send(message);            }        }, 30, 900, TimeUnit.SECONDS);        log.info("Health check scheduler started with 15 minutes period");    }