ResourceCalculator { public abstract float ratio(Resource a, Resource b);  abstract int compare(
      Resource clusterResource, Resource lhs, Resource rhs, boolean singleType); int compare(Resource clusterResource, Resource lhs, Resource rhs); static int divideAndCeil(int a, int b); static int divideAndCeil(int a, float b); static long divideAndCeil(long a, long b); static long divideAndCeil(long a, float b); static float divideSafelyAsFloat(long lhs, long rhs); static int roundUp(int a, int b); static long roundUp(long a, long b); static long roundDown(long a, long b); static int roundDown(int a, int b); abstract long computeAvailableContainers(
      Resource available, Resource required); abstract Resource multiplyAndNormalizeUp(
      Resource r, double by, Resource stepFactor); abstract Resource multiplyAndNormalizeUp(
      Resource r, double[] by, Resource stepFactor); abstract Resource multiplyAndNormalizeDown(
      Resource r, double by, Resource stepFactor); abstract Resource normalize(Resource r, Resource minimumResource,
      Resource maximumResource, Resource stepFactor); abstract Resource roundUp(Resource r, Resource stepFactor); abstract Resource roundDown(Resource r, Resource stepFactor); abstract float divide(
      Resource clusterResource, Resource numerator, Resource denominator); abstract boolean isInvalidDivisor(Resource r); abstract float ratio(Resource a, Resource b); abstract Resource divideAndCeil(Resource numerator, int denominator); abstract Resource divideAndCeil(Resource numerator, float denominator); abstract boolean fitsIn(Resource smaller, Resource bigger); abstract boolean isAnyMajorResourceZeroOrNegative(Resource resource); abstract Resource normalizeDown(Resource r, Resource stepFactor); abstract boolean isAnyMajorResourceAboveZero(Resource resource); abstract Set<String> getInsufficientResourceNames(Resource required,
      Resource available);  }
@Test public void testDivisionByZeroRatioDenominatorIsZero() { float ratio = resourceCalculator.ratio(newResource(1, 1), newResource(0, 0)); assertEquals(Float.POSITIVE_INFINITY, ratio, 0.00001); }
@Test public void testDivisionByZeroRatioNumeratorAndDenominatorIsZero() { float ratio = resourceCalculator.ratio(newResource(0, 0), newResource(0, 0)); assertEquals(0.0, ratio, 0.00001); }
@Test public void testRatioWithNoExtraResource() { Resource resource1 = newResource(1, 1); Resource resource2 = newResource(2, 1); float ratio = resourceCalculator.ratio(resource1, resource2); if (resourceCalculator instanceof DefaultResourceCalculator) { double ratioOfMemories = 0.5; assertEquals(ratioOfMemories, ratio, 0.00001); } else if (resourceCalculator instanceof DominantResourceCalculator) { double ratioOfCPUs = 1.0; assertEquals(ratioOfCPUs, ratio, 0.00001); } }
@Test public void testRatioWithExtraResource() { setupExtraResource(); Resource resource1 = newResource(1, 1, 2); Resource resource2 = newResource(2, 1, 1); float ratio = resourceCalculator.ratio(resource1, resource2); if (resourceCalculator instanceof DefaultResourceCalculator) { double ratioOfMemories = 0.5; assertEquals(ratioOfMemories, ratio, 0.00001); } else if (resourceCalculator instanceof DominantResourceCalculator) { double ratioOfExtraResources = 2.0; assertEquals(ratioOfExtraResources, ratio, 0.00001); } }