494 lines
24 KiB
JavaScript
494 lines
24 KiB
JavaScript
"use strict";
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/*
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* This is a TypeScript port of the original Java version, which was written by
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* Gil Tene as described in
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* https://github.com/HdrHistogram/HdrHistogram
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* and released to the public domain, as explained at
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* http://creativecommons.org/publicdomain/zero/1.0/
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.PackedArrayContext = exports.MINIMUM_INITIAL_PACKED_ARRAY_CAPACITY = void 0;
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/**
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* A packed-value, sparse array context used for storing 64 bit signed values.
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*
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* An array context is optimised for tracking sparsely set (as in mostly zeros) values that tend to not make
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* use pof the full 64 bit value range even when they are non-zero. The array context's internal representation
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* is such that the packed value at each virtual array index may be represented by 0-8 bytes of actual storage.
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*
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* An array context encodes the packed values in 8 "set trees" with each set tree representing one byte of the
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* packed value at the virtual index in question. The {@link #getPackedIndex(int, int, boolean)} method is used
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* to look up the byte-index corresponding to the given (set tree) value byte of the given virtual index, and can
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* be used to add entries to represent that byte as needed. As a succesful {@link #getPackedIndex(int, int, boolean)}
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* may require a resizing of the array, it can throw a {@link ResizeException} to indicate that the requested
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* packed index cannot be found or added without a resize of the physical storage.
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*
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*/
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exports.MINIMUM_INITIAL_PACKED_ARRAY_CAPACITY = 16;
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const MAX_SUPPORTED_PACKED_COUNTS_ARRAY_LENGTH = Math.pow(2, 13) - 1; //(Short.MAX_VALUE / 4); TODO ALEX why ???
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const SET_0_START_INDEX = 0;
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const NUMBER_OF_SETS = 8;
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const LEAF_LEVEL_SHIFT = 3;
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const NON_LEAF_ENTRY_SLOT_INDICATORS_OFFSET = 0;
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const NON_LEAF_ENTRY_HEADER_SIZE_IN_SHORTS = 1;
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const PACKED_ARRAY_GROWTH_INCREMENT = 16;
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const PACKED_ARRAY_GROWTH_FRACTION_POW2 = 4;
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const { pow, ceil, log2, max } = Math;
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const bitCount = (n) => {
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var bits = 0;
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while (n !== 0) {
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bits += bitCount32(n | 0);
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n /= 0x100000000;
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}
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return bits;
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};
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const bitCount32 = (n) => {
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n = n - ((n >> 1) & 0x55555555);
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n = (n & 0x33333333) + ((n >> 2) & 0x33333333);
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return (((n + (n >> 4)) & 0xf0f0f0f) * 0x1010101) >> 24;
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};
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class PackedArrayContext {
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constructor(virtualLength, initialPhysicalLength) {
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this.populatedShortLength = 0;
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this.topLevelShift = Number.MAX_VALUE; // Make it non-sensical until properly initialized.
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this.physicalLength = Math.max(initialPhysicalLength, exports.MINIMUM_INITIAL_PACKED_ARRAY_CAPACITY);
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this.isPacked =
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this.physicalLength <= MAX_SUPPORTED_PACKED_COUNTS_ARRAY_LENGTH;
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if (!this.isPacked) {
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this.physicalLength = virtualLength;
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}
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this.array = new ArrayBuffer(this.physicalLength * 8);
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this.initArrayViews(this.array);
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this.init(virtualLength);
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}
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initArrayViews(array) {
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this.byteArray = new Uint8Array(array);
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this.shortArray = new Uint16Array(array);
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this.longArray = new Float64Array(array);
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}
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init(virtualLength) {
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if (!this.isPacked) {
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// Deal with non-packed context init:
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this.virtualLength = virtualLength;
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return;
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}
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this.populatedShortLength = SET_0_START_INDEX + 8;
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// Populate empty root entries, and point to them from the root indexes:
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for (let i = 0; i < NUMBER_OF_SETS; i++) {
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this.setAtShortIndex(SET_0_START_INDEX + i, 0);
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}
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this.setVirtualLength(virtualLength);
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}
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clear() {
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this.byteArray.fill(0);
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this.init(this.virtualLength);
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}
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copyAndIncreaseSize(newPhysicalArrayLength, newVirtualArrayLength) {
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const ctx = new PackedArrayContext(newVirtualArrayLength, newPhysicalArrayLength);
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if (this.isPacked) {
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ctx.populateEquivalentEntriesWithEntriesFromOther(this);
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}
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return ctx;
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}
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getPopulatedShortLength() {
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return this.populatedShortLength;
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}
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getPopulatedLongLength() {
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return (this.getPopulatedShortLength() + 3) >> 2; // round up
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}
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setAtByteIndex(byteIndex, value) {
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this.byteArray[byteIndex] = value;
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}
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getAtByteIndex(byteIndex) {
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return this.byteArray[byteIndex];
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}
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/**
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* add a byte value to a current byte value in the array
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* @param byteIndex index of byte value to add to
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* @param valueToAdd byte value to add
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* @return the afterAddValue. ((afterAddValue & 0x100) != 0) indicates a carry.
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*/
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addAtByteIndex(byteIndex, valueToAdd) {
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const newValue = this.byteArray[byteIndex] + valueToAdd;
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this.byteArray[byteIndex] = newValue;
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return newValue;
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}
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setPopulatedLongLength(newPopulatedLongLength) {
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this.populatedShortLength = newPopulatedLongLength << 2;
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}
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getVirtualLength() {
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return this.virtualLength;
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}
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length() {
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return this.physicalLength;
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}
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setAtShortIndex(shortIndex, value) {
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this.shortArray[shortIndex] = value;
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}
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setAtLongIndex(longIndex, value) {
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this.longArray[longIndex] = value;
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}
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getAtShortIndex(shortIndex) {
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return this.shortArray[shortIndex];
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}
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getIndexAtShortIndex(shortIndex) {
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return this.shortArray[shortIndex];
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}
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setPackedSlotIndicators(entryIndex, newPackedSlotIndicators) {
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this.setAtShortIndex(entryIndex + NON_LEAF_ENTRY_SLOT_INDICATORS_OFFSET, newPackedSlotIndicators);
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}
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getPackedSlotIndicators(entryIndex) {
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return (this.shortArray[entryIndex + NON_LEAF_ENTRY_SLOT_INDICATORS_OFFSET] &
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0xffff);
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}
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getIndexAtEntrySlot(entryIndex, slot) {
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return this.getAtShortIndex(entryIndex + NON_LEAF_ENTRY_HEADER_SIZE_IN_SHORTS + slot);
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}
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setIndexAtEntrySlot(entryIndex, slot, newIndexValue) {
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this.setAtShortIndex(entryIndex + NON_LEAF_ENTRY_HEADER_SIZE_IN_SHORTS + slot, newIndexValue);
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}
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expandArrayIfNeeded(entryLengthInLongs) {
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const currentLength = this.length();
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if (currentLength < this.getPopulatedLongLength() + entryLengthInLongs) {
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const growthIncrement = max(entryLengthInLongs, PACKED_ARRAY_GROWTH_INCREMENT, this.getPopulatedLongLength() >> PACKED_ARRAY_GROWTH_FRACTION_POW2);
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this.resizeArray(currentLength + growthIncrement);
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}
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}
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newEntry(entryLengthInShorts) {
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// Add entry at the end of the array:
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const newEntryIndex = this.populatedShortLength;
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this.expandArrayIfNeeded((entryLengthInShorts >> 2) + 1);
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this.populatedShortLength = newEntryIndex + entryLengthInShorts;
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for (let i = 0; i < entryLengthInShorts; i++) {
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this.setAtShortIndex(newEntryIndex + i, -1); // Poison value -1. Must be overriden before reads
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}
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return newEntryIndex;
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}
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newLeafEntry() {
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// Add entry at the end of the array:
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let newEntryIndex;
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newEntryIndex = this.getPopulatedLongLength();
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this.expandArrayIfNeeded(1);
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this.setPopulatedLongLength(newEntryIndex + 1);
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this.setAtLongIndex(newEntryIndex, 0);
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return newEntryIndex;
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}
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/**
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* Consolidate entry with previous entry verison if one exists
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*
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* @param entryIndex The shortIndex of the entry to be consolidated
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* @param previousVersionIndex the index of the previous version of the entry
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*/
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consolidateEntry(entryIndex, previousVersionIndex) {
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const previousVersionPackedSlotsIndicators = this.getPackedSlotIndicators(previousVersionIndex);
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// Previous version exists, needs consolidation
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const packedSlotsIndicators = this.getPackedSlotIndicators(entryIndex);
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const insertedSlotMask = packedSlotsIndicators ^ previousVersionPackedSlotsIndicators; // the only bit that differs
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const slotsBelowBitNumber = packedSlotsIndicators & (insertedSlotMask - 1);
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const insertedSlotIndex = bitCount(slotsBelowBitNumber);
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const numberOfSlotsInEntry = bitCount(packedSlotsIndicators);
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// Copy the entry slots from previous version, skipping the newly inserted slot in the target:
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let sourceSlot = 0;
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for (let targetSlot = 0; targetSlot < numberOfSlotsInEntry; targetSlot++) {
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if (targetSlot !== insertedSlotIndex) {
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const indexAtSlot = this.getIndexAtEntrySlot(previousVersionIndex, sourceSlot);
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if (indexAtSlot !== 0) {
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this.setIndexAtEntrySlot(entryIndex, targetSlot, indexAtSlot);
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}
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sourceSlot++;
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}
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}
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}
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/**
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* Expand entry as indicated.
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*
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* @param existingEntryIndex the index of the entry
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* @param entryPointerIndex index to the slot pointing to the entry (needs to be fixed up)
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* @param insertedSlotIndex realtive [packed] index of slot being inserted into entry
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* @param insertedSlotMask mask value fo slot being inserted
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* @param nextLevelIsLeaf the level below this one is a leaf level
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* @return the updated index of the entry (-1 if epansion failed due to conflict)
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* @throws RetryException if expansion fails due to concurrent conflict, and caller should try again.
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*/
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expandEntry(existingEntryIndex, entryPointerIndex, insertedSlotIndex, insertedSlotMask, nextLevelIsLeaf) {
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let packedSlotIndicators = this.getAtShortIndex(existingEntryIndex) & 0xffff;
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packedSlotIndicators |= insertedSlotMask;
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const numberOfslotsInExpandedEntry = bitCount(packedSlotIndicators);
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if (insertedSlotIndex >= numberOfslotsInExpandedEntry) {
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throw new Error("inserted slot index is out of range given provided masks");
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}
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const expandedEntryLength = numberOfslotsInExpandedEntry + NON_LEAF_ENTRY_HEADER_SIZE_IN_SHORTS;
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// Create new next-level entry to refer to from slot at this level:
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let indexOfNewNextLevelEntry = 0;
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if (nextLevelIsLeaf) {
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indexOfNewNextLevelEntry = this.newLeafEntry(); // Establish long-index to new leaf entry
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}
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else {
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// TODO: Optimize this by creating the whole sub-tree here, rather than a step that will immediaterly expand
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// Create a new 1 word (empty, no slots set) entry for the next level:
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indexOfNewNextLevelEntry = this.newEntry(NON_LEAF_ENTRY_HEADER_SIZE_IN_SHORTS); // Establish short-index to new leaf entry
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this.setPackedSlotIndicators(indexOfNewNextLevelEntry, 0);
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}
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const insertedSlotValue = indexOfNewNextLevelEntry;
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const expandedEntryIndex = this.newEntry(expandedEntryLength);
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// populate the packed indicators word:
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this.setPackedSlotIndicators(expandedEntryIndex, packedSlotIndicators);
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// Populate the inserted slot with the index of the new next level entry:
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this.setIndexAtEntrySlot(expandedEntryIndex, insertedSlotIndex, insertedSlotValue);
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this.setAtShortIndex(entryPointerIndex, expandedEntryIndex);
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this.consolidateEntry(expandedEntryIndex, existingEntryIndex);
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return expandedEntryIndex;
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}
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//
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// ###### ######## ######## ## ## ### ## ## #### ## ## ######## ######## ## ##
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// ## ## ## ## ## ## ## ## ## ## ## ### ## ## ## ## ## ##
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// ## ## ## ## ## ## ## ## ## ## #### ## ## ## ## ## ##
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// ## #### ###### ## ## ## ## ## ## ## ## ## ## ## ## ## ###### ###
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// ## ## ## ## ## ## ######### ## ## ## ## #### ## ## ## ## ##
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// ## ## ## ## ## ## ## ## ## ## ## ## ### ## ## ## ## ##
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// ###### ######## ## ### ## ## ######## ## #### ## ## ######## ######## ## ##
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//
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getRootEntry(setNumber, insertAsNeeded = false) {
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const entryPointerIndex = SET_0_START_INDEX + setNumber;
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let entryIndex = this.getIndexAtShortIndex(entryPointerIndex);
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if (entryIndex == 0) {
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if (!insertAsNeeded) {
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return 0; // Index does not currently exist in packed array;
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}
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entryIndex = this.newEntry(NON_LEAF_ENTRY_HEADER_SIZE_IN_SHORTS);
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// Create a new empty (no slots set) entry for the next level:
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this.setPackedSlotIndicators(entryIndex, 0);
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this.setAtShortIndex(entryPointerIndex, entryIndex);
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}
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return entryIndex;
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}
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/**
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* Get the byte-index (into the packed array) corresponding to a given (set tree) value byte of given virtual index.
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* Inserts new set tree nodes as needed if indicated.
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*
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* @param setNumber The set tree number (0-7, 0 corresponding with the LSByte set tree)
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* @param virtualIndex The virtual index into the PackedArray
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* @param insertAsNeeded If true, will insert new set tree nodes as needed if they do not already exist
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* @return the byte-index corresponding to the given (set tree) value byte of the given virtual index
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*/
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getPackedIndex(setNumber, virtualIndex, insertAsNeeded) {
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if (virtualIndex >= this.virtualLength) {
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throw new Error(`Attempting access at index ${virtualIndex}, beyond virtualLength ${this.virtualLength}`);
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}
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let entryPointerIndex = SET_0_START_INDEX + setNumber; // TODO init needed ?
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let entryIndex = this.getRootEntry(setNumber, insertAsNeeded);
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if (entryIndex == 0) {
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return -1; // Index does not currently exist in packed array;
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}
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// Work down the levels of non-leaf entries:
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for (let indexShift = this.topLevelShift; indexShift >= LEAF_LEVEL_SHIFT; indexShift -= 4) {
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const nextLevelIsLeaf = indexShift === LEAF_LEVEL_SHIFT;
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// Target is a packedSlotIndicators entry
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const packedSlotIndicators = this.getPackedSlotIndicators(entryIndex);
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const slotBitNumber = (virtualIndex / pow(2, indexShift)) & 0xf; //(virtualIndex >>> indexShift) & 0xf;
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const slotMask = 1 << slotBitNumber;
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const slotsBelowBitNumber = packedSlotIndicators & (slotMask - 1);
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const slotNumber = bitCount(slotsBelowBitNumber);
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if ((packedSlotIndicators & slotMask) === 0) {
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// The entryIndex slot does not have the contents we want
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if (!insertAsNeeded) {
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return -1; // Index does not currently exist in packed array;
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}
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// Expand the entry, adding the index to new entry at the proper slot:
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entryIndex = this.expandEntry(entryIndex, entryPointerIndex, slotNumber, slotMask, nextLevelIsLeaf);
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}
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// Next level's entry pointer index is in the appropriate slot in in the entries array in this entry:
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entryPointerIndex =
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entryIndex + NON_LEAF_ENTRY_HEADER_SIZE_IN_SHORTS + slotNumber;
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entryIndex = this.getIndexAtShortIndex(entryPointerIndex);
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}
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// entryIndex is the long-index of a leaf entry that contains the value byte for the given set
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const byteIndex = (entryIndex << 3) + (virtualIndex & 0x7); // Determine byte index offset within leaf entry
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return byteIndex;
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}
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determineTopLevelShiftForVirtualLength(virtualLength) {
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const sizeMagnitude = ceil(log2(virtualLength));
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const eightsSizeMagnitude = sizeMagnitude - 3;
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let multipleOfFourSizeMagnitude = ceil(eightsSizeMagnitude / 4) * 4;
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multipleOfFourSizeMagnitude = max(multipleOfFourSizeMagnitude, 8);
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const topLevelShiftNeeded = multipleOfFourSizeMagnitude - 4 + 3;
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return topLevelShiftNeeded;
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}
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setVirtualLength(virtualLength) {
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if (!this.isPacked) {
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throw new Error("Should never be adjusting the virtual size of a non-packed context");
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}
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this.topLevelShift = this.determineTopLevelShiftForVirtualLength(virtualLength);
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this.virtualLength = virtualLength;
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}
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getTopLevelShift() {
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return this.topLevelShift;
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}
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//
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// ## ## ######## ####### ######## ## ## ## ### ######## ########
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// ## ## ## ## ## ## ## ## ## ## ## ## ## ## ##
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// ## ## ## ## ## ## ## ## ## ## ## ## ## ## ##
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// ### ####### ######## ## ## ######## ## ## ## ## ## ## ######
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// ## ## ## ## ## ## ## ## ## ######### ## ##
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// ## ## ## ## ## ## ## ## ## ## ## ## ##
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// ## ## ## ####### ## ####### ######## ## ## ## ########
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//
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resizeArray(newLength) {
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const tmp = new Uint8Array(newLength * 8);
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tmp.set(this.byteArray);
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this.array = tmp.buffer;
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this.initArrayViews(this.array);
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this.physicalLength = newLength;
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}
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populateEquivalentEntriesWithEntriesFromOther(other) {
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if (this.virtualLength < other.getVirtualLength()) {
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throw new Error("Cannot populate array of smaller virtual length");
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}
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for (let i = 0; i < NUMBER_OF_SETS; i++) {
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const otherEntryIndex = other.getAtShortIndex(SET_0_START_INDEX + i);
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if (otherEntryIndex == 0)
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continue; // No tree to duplicate
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let entryIndexPointer = SET_0_START_INDEX + i;
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for (let i = this.topLevelShift; i > other.topLevelShift; i -= 4) {
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// for each inserted level:
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// Allocate entry in other:
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const sizeOfEntry = NON_LEAF_ENTRY_HEADER_SIZE_IN_SHORTS + 1;
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const newEntryIndex = this.newEntry(sizeOfEntry);
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// Link new level in.
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this.setAtShortIndex(entryIndexPointer, newEntryIndex);
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// Populate new level entry, use pointer to slot 0 as place to populate under:
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this.setPackedSlotIndicators(newEntryIndex, 0x1); // Slot 0 populated
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entryIndexPointer =
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newEntryIndex + NON_LEAF_ENTRY_HEADER_SIZE_IN_SHORTS; // Where the slot 0 index goes.
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}
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this.copyEntriesAtLevelFromOther(other, otherEntryIndex, entryIndexPointer, other.topLevelShift);
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}
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}
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copyEntriesAtLevelFromOther(other, otherLevelEntryIndex, levelEntryIndexPointer, otherIndexShift) {
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const nextLevelIsLeaf = otherIndexShift == LEAF_LEVEL_SHIFT;
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const packedSlotIndicators = other.getPackedSlotIndicators(otherLevelEntryIndex);
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const numberOfSlots = bitCount(packedSlotIndicators);
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const sizeOfEntry = NON_LEAF_ENTRY_HEADER_SIZE_IN_SHORTS + numberOfSlots;
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const entryIndex = this.newEntry(sizeOfEntry);
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this.setAtShortIndex(levelEntryIndexPointer, entryIndex);
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this.setAtShortIndex(entryIndex + NON_LEAF_ENTRY_SLOT_INDICATORS_OFFSET, packedSlotIndicators);
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for (let i = 0; i < numberOfSlots; i++) {
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if (nextLevelIsLeaf) {
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// Make leaf in other:
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const leafEntryIndex = this.newLeafEntry();
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this.setIndexAtEntrySlot(entryIndex, i, leafEntryIndex);
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// OPTIM
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// avoid iteration on all the values of the source ctx
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const otherNextLevelEntryIndex = other.getIndexAtEntrySlot(otherLevelEntryIndex, i);
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this.longArray[leafEntryIndex] =
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other.longArray[otherNextLevelEntryIndex];
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}
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else {
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const otherNextLevelEntryIndex = other.getIndexAtEntrySlot(otherLevelEntryIndex, i);
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this.copyEntriesAtLevelFromOther(other, otherNextLevelEntryIndex, entryIndex + NON_LEAF_ENTRY_HEADER_SIZE_IN_SHORTS + i, otherIndexShift - 4);
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}
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}
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}
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getAtUnpackedIndex(index) {
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return this.longArray[index];
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}
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setAtUnpackedIndex(index, newValue) {
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this.longArray[index] = newValue;
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}
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lazysetAtUnpackedIndex(index, newValue) {
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this.longArray[index] = newValue;
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}
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incrementAndGetAtUnpackedIndex(index) {
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this.longArray[index]++;
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return this.longArray[index];
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}
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addAndGetAtUnpackedIndex(index, valueToAdd) {
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this.longArray[index] += valueToAdd;
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return this.longArray[index];
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}
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//
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// ######## ####### ###### ######## ######## #### ## ## ######
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// ## ## ## ## ## ## ## ## ## ### ## ## ##
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// ## ## ## ## ## ## ## ## #### ## ##
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|
// ## ## ## ####### ###### ## ######## ## ## ## ## ## ####
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// ## ## ## ## ## ## ## ## ## #### ## ##
|
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// ## ## ## ## ## ## ## ## ## ## ### ## ##
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// ## ####### ###### ## ## ## #### ## ## ######
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//
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nonLeafEntryToString(entryIndex, indexShift, indentLevel) {
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let output = "";
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for (let i = 0; i < indentLevel; i++) {
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output += " ";
|
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}
|
|
try {
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const packedSlotIndicators = this.getPackedSlotIndicators(entryIndex);
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output += `slotIndiators: 0x${toHex(packedSlotIndicators)}, prevVersionIndex: 0: [ `;
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const numberOfslotsInEntry = bitCount(packedSlotIndicators);
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for (let i = 0; i < numberOfslotsInEntry; i++) {
|
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output += this.getIndexAtEntrySlot(entryIndex, i);
|
|
if (i < numberOfslotsInEntry - 1) {
|
|
output += ", ";
|
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}
|
|
}
|
|
output += ` ] (indexShift = ${indexShift})\n`;
|
|
const nextLevelIsLeaf = indexShift == LEAF_LEVEL_SHIFT;
|
|
for (let i = 0; i < numberOfslotsInEntry; i++) {
|
|
const nextLevelEntryIndex = this.getIndexAtEntrySlot(entryIndex, i);
|
|
if (nextLevelIsLeaf) {
|
|
output += this.leafEntryToString(nextLevelEntryIndex, indentLevel + 4);
|
|
}
|
|
else {
|
|
output += this.nonLeafEntryToString(nextLevelEntryIndex, indexShift - 4, indentLevel + 4);
|
|
}
|
|
}
|
|
}
|
|
catch (ex) {
|
|
output += `Exception thrown at nonLeafEnty at index ${entryIndex} with indexShift ${indexShift}\n`;
|
|
}
|
|
return output;
|
|
}
|
|
leafEntryToString(entryIndex, indentLevel) {
|
|
let output = "";
|
|
for (let i = 0; i < indentLevel; i++) {
|
|
output += " ";
|
|
}
|
|
try {
|
|
output += "Leaf bytes : ";
|
|
for (let i = 0; i < 8; i++) {
|
|
output += `0x${toHex(this.byteArray[entryIndex * 8 + i])} `;
|
|
}
|
|
output += "\n";
|
|
}
|
|
catch (ex) {
|
|
output += `Exception thrown at leafEnty at index ${entryIndex}\n`;
|
|
}
|
|
return output;
|
|
}
|
|
toString() {
|
|
let output = "PackedArrayContext:\n";
|
|
if (!this.isPacked) {
|
|
return output + "Context is unpacked:\n"; // unpackedToString();
|
|
}
|
|
for (let setNumber = 0; setNumber < NUMBER_OF_SETS; setNumber++) {
|
|
try {
|
|
const entryPointerIndex = SET_0_START_INDEX + setNumber;
|
|
const entryIndex = this.getIndexAtShortIndex(entryPointerIndex);
|
|
output += `Set ${setNumber}: root = ${entryIndex} \n`;
|
|
if (entryIndex == 0)
|
|
continue;
|
|
output += this.nonLeafEntryToString(entryIndex, this.topLevelShift, 4);
|
|
}
|
|
catch (ex) {
|
|
output += `Exception thrown in set ${setNumber}%d\n`;
|
|
}
|
|
}
|
|
//output += recordedValuesToString();
|
|
return output;
|
|
}
|
|
}
|
|
exports.PackedArrayContext = PackedArrayContext;
|
|
const toHex = (n) => {
|
|
return Number(n)
|
|
.toString(16)
|
|
.padStart(2, "0");
|
|
};
|
|
//# sourceMappingURL=PackedArrayContext.js.map
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