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The Validate Tool project contains software for validating PDS4 product labels and product data.

There is a newer version: 3.6.3

package gov.nasa.pds.web.ui.utils;

/*
 * This class is primarily for checking that we have enough memory to continue a
 * process. However, the information provided isn't currently useful on windows
 * due to how memory allocation works. Forums indicate that you'll need to use
 * an OS specific program to get this information. It may be enough to have a
 * flag for doing this check and only implementing something that would work on
 * the deployed environments. HOWEVER, some people may choose to install locally
 * and we can't control what environment they're on... More research should
 * happen before this gets implemented in the app.
 */
public class SystemUtils {

	private static final long MEGABYTE = 1024L * 1024L;

	public static long bytesToMeg(long bytes) {
		return bytes / MEGABYTE;
	}

	public static long megsToBytes(long megs) {
		return megs * MEGABYTE;
	}

	public static long getTotalMemory() {
		return Runtime.getRuntime().maxMemory();
	}

	public static long getAvailableMemory() {
		Runtime r = Runtime.getRuntime();
		return r.freeMemory() + (r.maxMemory() - r.totalMemory());
	}

	public static double getPercentMemoryFree() {
		return (double) getAvailableMemory() / (double) getTotalMemory() * 100;
	}

	public static void checkAvailableMemory() throws RuntimeException {
		checkAvailableMemory(8);
		checkAvailableMemory(10.0);
	}

	@SuppressWarnings("nls")
	public static void checkAvailableMemory(final long megsFree)
			throws RuntimeException {
		final long availableMemory = bytesToMeg(getAvailableMemory());
		if (availableMemory < megsFree) {
			throw new RuntimeException("Insufficient memory for process. "
					+ availableMemory + " megs are free.");
		}
	}

	@SuppressWarnings("nls")
	public static void checkAvailableMemory(final double percentFree)
			throws RuntimeException {
		final double availPercentFree = getPercentMemoryFree();
		if (availPercentFree < percentFree) {
			throw new RuntimeException("Insufficient memory for process. "
					+ availPercentFree + " percent free.");
		}
	}
}