MemoryInfo Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/info/ProcessInfo.java lines 261–354

	public static class MemoryInfo {

		private static final MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();

		private static final List<GarbageCollectorMXBean> garbageCollectorMXBeans = ManagementFactory
			.getGarbageCollectorMXBeans();

		private final MemoryUsageInfo heap;

		private final MemoryUsageInfo nonHeap;

		private final List<GarbageCollectorInfo> garbageCollectors;

		MemoryInfo() {
			this.heap = new MemoryUsageInfo(memoryMXBean.getHeapMemoryUsage());
			this.nonHeap = new MemoryUsageInfo(memoryMXBean.getNonHeapMemoryUsage());
			this.garbageCollectors = garbageCollectorMXBeans.stream().map(GarbageCollectorInfo::new).toList();
		}

		public MemoryUsageInfo getHeap() {
			return this.heap;
		}

		public MemoryUsageInfo getNonHeap() {
			return this.nonHeap;
		}

		/**
		 * Garbage Collector information for the process. This list provides details about
		 * the currently used GC algorithms selected by the user or JVM ergonomics. It
		 * might not be trivial to know the used GC algorithms since that usually depends
		 * on the {@link Runtime#availableProcessors()} (see:
		 * {@link ProcessInfo#getCpus()}) and the available memory (see:
		 * {@link MemoryUsageInfo}).
		 * @return {@link List} of {@link GarbageCollectorInfo}.
		 * @since 3.5.0
		 */
		public List<GarbageCollectorInfo> getGarbageCollectors() {
			return this.garbageCollectors;
		}

		public static class MemoryUsageInfo {

			private final MemoryUsage memoryUsage;

			MemoryUsageInfo(MemoryUsage memoryUsage) {
				this.memoryUsage = memoryUsage;
			}

			public long getInit() {
				return this.memoryUsage.getInit();
			}

			public long getUsed() {
				return this.memoryUsage.getUsed();
			}

			public long getCommitted() {
				return this.memoryUsage.getCommitted();
			}

			public long getMax() {
				return this.memoryUsage.getMax();
			}

		}

		/**
		 * Garbage collection information.
		 *
		 * @since 3.5.0
		 */
		public static class GarbageCollectorInfo {

			private final String name;

			private final long collectionCount;

			GarbageCollectorInfo(GarbageCollectorMXBean garbageCollectorMXBean) {
				this.name = garbageCollectorMXBean.getName();
				this.collectionCount = garbageCollectorMXBean.getCollectionCount();
			}

			public String getName() {
				return this.name;
			}

			public long getCollectionCount() {
				return this.collectionCount;
			}

		}

	}