SingleUseSpringApplicationHook Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/SpringApplication.java lines 1678–1693

	private static final class SingleUseSpringApplicationHook implements SpringApplicationHook {

		private final AtomicBoolean used = new AtomicBoolean();

		private final SpringApplicationHook delegate;

		private SingleUseSpringApplicationHook(SpringApplicationHook delegate) {
			this.delegate = delegate;
		}

		@Override
		public @Nullable SpringApplicationRunListener getRunListener(SpringApplication springApplication) {
			return this.used.compareAndSet(false, true) ? this.delegate.getRunListener(springApplication) : null;
		}

	}