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package jdk.nashorn.internal.ir.debug;

import java.util.Comparator;

Class histogram element for IR / Java object instrumentation
/** * Class histogram element for IR / Java object instrumentation */
public final class ClassHistogramElement {
Instance comparator
/** * Instance comparator */
public static final Comparator<ClassHistogramElement> COMPARE_INSTANCES = new Comparator<ClassHistogramElement>() { @Override public int compare(final ClassHistogramElement o1, final ClassHistogramElement o2) { return (int)Math.abs(o1.instances - o2.instances); } };
Bytes comparator
/** * Bytes comparator */
public static final Comparator<ClassHistogramElement> COMPARE_BYTES = new Comparator<ClassHistogramElement>() { @Override public int compare(final ClassHistogramElement o1, final ClassHistogramElement o2) { return (int)Math.abs(o1.bytes - o2.bytes); } };
Classname comparator
/** * Classname comparator */
public static final Comparator<ClassHistogramElement> COMPARE_CLASSNAMES = new Comparator<ClassHistogramElement>() { @Override public int compare(final ClassHistogramElement o1, final ClassHistogramElement o2) { return o1.clazz.getCanonicalName().compareTo(o2.clazz.getCanonicalName()); } }; private final Class<?> clazz; private long instances; private long bytes;
Constructor
Params:
  • clazz – class for which to construct histogram
/** * Constructor * @param clazz class for which to construct histogram */
public ClassHistogramElement(final Class<?> clazz) { this.clazz = clazz; }
Add an instance
Params:
  • sizeInBytes – byte count
/** * Add an instance * @param sizeInBytes byte count */
public void addInstance(final long sizeInBytes) { instances++; this.bytes += sizeInBytes; }
Get size in bytes
Returns:size in bytes
/** * Get size in bytes * @return size in bytes */
public long getBytes() { return bytes; }
Get class
Returns:class
/** * Get class * @return class */
public Class<?> getClazz() { return clazz; }
Get number of instances
Returns:number of instances
/** * Get number of instances * @return number of instances */
public long getInstances() { return instances; } @Override public String toString() { return "ClassHistogramElement[class=" + clazz.getCanonicalName() + ", instances=" + instances + ", bytes=" + bytes + "]"; } }