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