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Create a custom parser for parsing ISO8601 datetime variants (elastic…
…#106486) This adds a hand-written parser for parsing fixed ISO8601 datetime strings, for the `iso8601`, `strict_date_optional_time`, and `strict_date_optional_time_nanos` date formats. If the new parser fails to parse a string, the existing parsers are then tried, so existing behaviour is maintained. There is a new JVM option added that can force use of the existing parsers, if that is needed for any reason.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| pr: 106486 | ||
| summary: Create custom parser for ISO-8601 datetimes | ||
| area: Infra/Core | ||
| type: enhancement | ||
| issues: | ||
| - 102063 | ||
| highlight: | ||
| title: New custom parser for ISO-8601 datetimes | ||
| body: |- | ||
| This introduces a new custom parser for ISO-8601 datetimes, for the `iso8601`, `strict_date_optional_time`, and | ||
| `strict_date_optional_time_nanos` built-in date formats. This provides a performance improvement over the | ||
| default Java date-time parsing. Whilst it maintains much of the same behaviour, | ||
| the new parser does not accept nonsensical date-time strings that have multiple fractional seconds fields | ||
| or multiple timezone specifiers. If the new parser fails to parse a string, it will then use the previous parser | ||
| to parse it. If a large proportion of the input data consists of these invalid strings, this may cause | ||
| a small performance degradation. If you wish to force the use of the old parsers regardless, | ||
| set the JVM property `es.datetime.java_time_parsers=true` on all ES nodes. |
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server/src/main/java/org/elasticsearch/common/time/CharSubSequence.java
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| /* | ||
| * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| * or more contributor license agreements. Licensed under the Elastic License | ||
| * 2.0 and the Server Side Public License, v 1; you may not use this file except | ||
| * in compliance with, at your election, the Elastic License 2.0 or the Server | ||
| * Side Public License, v 1. | ||
| */ | ||
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| package org.elasticsearch.common.time; | ||
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| import java.util.stream.IntStream; | ||
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| /** | ||
| * A CharSequence that provides a subsequence of another CharSequence without allocating a new backing array (as String does) | ||
| */ | ||
| class CharSubSequence implements CharSequence { | ||
| private final CharSequence wrapped; | ||
| private final int startOffset; // inclusive | ||
| private final int endOffset; // exclusive | ||
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| CharSubSequence(CharSequence wrapped, int startOffset, int endOffset) { | ||
| if (startOffset < 0) throw new IllegalArgumentException(); | ||
| if (endOffset > wrapped.length()) throw new IllegalArgumentException(); | ||
| if (endOffset < startOffset) throw new IllegalArgumentException(); | ||
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| this.wrapped = wrapped; | ||
| this.startOffset = startOffset; | ||
| this.endOffset = endOffset; | ||
| } | ||
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| @Override | ||
| public int length() { | ||
| return endOffset - startOffset; | ||
| } | ||
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| @Override | ||
| public char charAt(int index) { | ||
| int adjustedIndex = index + startOffset; | ||
| if (adjustedIndex < startOffset || adjustedIndex >= endOffset) throw new IndexOutOfBoundsException(index); | ||
| return wrapped.charAt(adjustedIndex); | ||
| } | ||
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| @Override | ||
| public boolean isEmpty() { | ||
| return startOffset == endOffset; | ||
| } | ||
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| @Override | ||
| public CharSequence subSequence(int start, int end) { | ||
| int adjustedStart = start + startOffset; | ||
| int adjustedEnd = end + startOffset; | ||
| if (adjustedStart < startOffset) throw new IndexOutOfBoundsException(start); | ||
| if (adjustedEnd > endOffset) throw new IndexOutOfBoundsException(end); | ||
| if (adjustedStart > adjustedEnd) throw new IndexOutOfBoundsException(); | ||
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| return wrapped.subSequence(adjustedStart, adjustedEnd); | ||
| } | ||
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| @Override | ||
| public IntStream chars() { | ||
| return wrapped.chars().skip(startOffset).limit(endOffset - startOffset); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return wrapped.subSequence(startOffset, endOffset).toString(); | ||
| } | ||
| } |
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