Startup Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/SpringApplication.java lines 1744–1778

	abstract static class Startup {

		private @Nullable Duration timeTakenToStarted;

		protected abstract long startTime();

		protected abstract @Nullable Long processUptime();

		protected abstract String action();

		final Duration started() {
			long now = System.currentTimeMillis();
			this.timeTakenToStarted = Duration.ofMillis(now - startTime());
			return this.timeTakenToStarted;
		}

		Duration timeTakenToStarted() {
			Assert.state(this.timeTakenToStarted != null,
					"timeTakenToStarted is not set. Make sure to call started() before this method");
			return this.timeTakenToStarted;
		}

		private Duration ready() {
			long now = System.currentTimeMillis();
			return Duration.ofMillis(now - startTime());
		}

		static Startup create() {
			ClassLoader classLoader = Startup.class.getClassLoader();
			return (ClassUtils.isPresent("jdk.crac.management.CRaCMXBean", classLoader)
					&& ClassUtils.isPresent("org.crac.management.CRaCMXBean", classLoader))
							? new CoordinatedRestoreAtCheckpointStartup() : new StandardStartup();
		}

	}