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Generic Evolver utility classes

There is a newer version: 3.5.0

package fi.evolver.utils.timing;

public class TimingUtils {
	private static final ThreadLocal watchHolder = new ThreadLocal<>();

	private static final int MAX_DEPTH = 10;


	private TimingUtils() { }


	private static GroupingStopWatch getWatch() {
		GroupingStopWatch watch = watchHolder.get();
		if (watch == null) {
			watch = new GroupingStopWatch();
			watchHolder.set(watch);
		}
		return watch;
	}


	public static GroupingStopWatch destroyTimer() {
		GroupingStopWatch watch = getWatch();
		watch.end();
		watchHolder.remove();
		return watch;
	}


	public static AutoCloser createTimer() {
		watchHolder.remove();
		return new AutoCloser(getWatch(), 0);
	}


	public static AutoCloser begin(String task, String... subTasks) {
		GroupingStopWatch watch = getWatch();
		int depth = watch.getDepth();
		if (depth < MAX_DEPTH)
			watch.begin(task);

		for (String subTask: subTasks) {
			if (depth >= MAX_DEPTH)
				break;
			watch.begin(subTask);
		}

		return new AutoCloser(watch, depth);
	}


	public static class AutoCloser implements AutoCloseable {
		private final GroupingStopWatch watch;
		private final int targetDepth;

		public AutoCloser(GroupingStopWatch watch, int targetDepth) {
			this.watch = watch;
			this.targetDepth = targetDepth;
		}


		@Override
		public void close() {
			while (watch.getDepth() > targetDepth)
				watch.end();
		}

	}

}