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Change license to apache 2.0, add notice for opentelemetry code
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‎libs/exponential-histogram/LICENSE.txt‎

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Apache License
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Version 2.0, January 2004
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http://www.apache.org/licenses/
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‎libs/exponential-histogram/NOTICES.txt‎

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Elastic-exponential-histogram
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Copyright 2025 Elasticsearch B.V.
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--
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Licensed to Elasticsearch B.V. under one or more contributor
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license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright
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ownership. Elasticsearch B.V. licenses this file to you under
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the Apache License, Version 2.0 (the "License"); you may
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not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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This project is based on a modification of https://github.com/open-telemetry/opentelemetry-java which is licensed under the Apache 2.0 License.
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--

‎libs/exponential-histogram/build.gradle‎

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// this lib does not depend on core, so only jdk signatures should be checked
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replaceSignatureFiles 'jdk-signatures'
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}
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ext.projectLicenses.set(['The Apache Software License, Version 2.0': providers.provider(() -> 'http://www.apache.org/licenses/LICENSE-2.0')])
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licenseFile.set(layout.settingsDirectory.file('licenses/APACHE-LICENSE-2.0.txt').asFile)
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tasks.named("licenseHeaders").configure {
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approvedLicenses = ['Apache', 'Generated', 'Vendored']
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}
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‎libs/exponential-histogram/src/main/java/org/elasticsearch/exponentialhistogram/Base2ExponentialHistogramIndexer.java‎

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/*
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* Licensed to Elasticsearch B.V. under one or more contributor
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* license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright
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* ownership. Elasticsearch B.V. licenses this file to you under
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* the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*
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* This file is based on a modification of https://github.com/open-telemetry/opentelemetry-java which is licensed under the Apache 2.0 License.
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*/
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package org.elasticsearch.exponentialhistogram;
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/**
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* The code in this class was copied and slightly adapted from the
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* <a href="https://github.com/open-telemetry/opentelemetry-java/blob/78a917da2e8f4bc3645f4fb10361e3e844aab9fb/sdk/metrics/src/main/java/io/opentelemetry/sdk/metrics/internal/aggregator/Base2ExponentialHistogramIndexer.java">OpenTelemetry Base2ExponentialHistogramIndexer implementation</a>,
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* licensed under the Apache License 2.0.
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*/
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class Base2ExponentialHistogramIndexer {
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/**
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* Bit mask used to isolate exponent of IEEE 754 double precision number.
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*/
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private static final long EXPONENT_BIT_MASK = 0x7FF0000000000000L;
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/**
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* Bit mask used to isolate the significand of IEEE 754 double precision number.
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*/
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private static final long SIGNIFICAND_BIT_MASK = 0xFFFFFFFFFFFFFL;
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/**
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* Bias used in representing the exponent of IEEE 754 double precision number.
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*/
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private static final int EXPONENT_BIAS = 1023;
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/**
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* The number of bits used to represent the significand of IEEE 754 double precision number,
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* excluding the implicit bit.
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*/
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private static final int SIGNIFICAND_WIDTH = 52;
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/**
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* The number of bits used to represent the exponent of IEEE 754 double precision number.
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*/
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private static final int EXPONENT_WIDTH = 11;
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private static final double LOG_BASE2_E = 1D / Math.log(2);
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static long computeIndex(double value, int scale) {
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double absValue = Math.abs(value);
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// For positive scales, compute the index by logarithm, which is simpler but may be
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// inaccurate near bucket boundaries
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if (scale > 0) {
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return getIndexByLogarithm(absValue, scale);
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}
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// For scale zero, compute the exact index by extracting the exponent
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if (scale == 0) {
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return mapToIndexScaleZero(absValue);
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}
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// For negative scales, compute the exact index by extracting the exponent and shifting it to
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// the right by -scale
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return mapToIndexScaleZero(absValue) >> -scale;
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}
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/**
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* Compute the bucket index using a logarithm based approach.
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*
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* @see <a
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* href="https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/data-model.md#all-scales-use-the-logarithm-function">All
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* Scales: Use the Logarithm Function</a>
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*/
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private static long getIndexByLogarithm(double value, int scale) {
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return (long) Math.ceil(Math.scalb(Math.log(value) * LOG_BASE2_E, scale)) - 1;
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}
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/**
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* Compute the exact bucket index for scale zero by extracting the exponent.
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*
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* @see <a
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* href="https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/data-model.md#scale-zero-extract-the-exponent">Scale
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* Zero: Extract the Exponent</a>
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*/
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private static long mapToIndexScaleZero(double value) {
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long rawBits = Double.doubleToLongBits(value);
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long rawExponent = (rawBits & EXPONENT_BIT_MASK) >> SIGNIFICAND_WIDTH;
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long rawSignificand = rawBits & SIGNIFICAND_BIT_MASK;
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if (rawExponent == 0) {
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rawExponent -= Long.numberOfLeadingZeros(rawSignificand - 1) - EXPONENT_WIDTH - 1;
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}
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int ieeeExponent = (int) (rawExponent - EXPONENT_BIAS);
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if (rawSignificand == 0) {
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return ieeeExponent - 1;
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}
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return ieeeExponent;
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}
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}

‎libs/exponential-histogram/src/main/java/org/elasticsearch/exponentialhistogram/BucketIterator.java‎

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/*
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* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
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* or more contributor license agreements. Licensed under the "Elastic License
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* 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
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* Public License v 1"; you may not use this file except in compliance with, at
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* your election, the "Elastic License 2.0", the "GNU Affero General Public
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* License v3.0 only", or the "Server Side Public License, v 1".
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* Licensed to Elasticsearch B.V. under one or more contributor
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* license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright
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* ownership. Elasticsearch B.V. licenses this file to you under
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* the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*
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* This file is based on a modification of https://github.com/open-telemetry/opentelemetry-java which is licensed under the Apache 2.0 License.
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*/
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package org.elasticsearch.exponentialhistogram;

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