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use custom date parser

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A specialized date parser that can only handle ISO-8601 like dates
(2011-12-03T10:15:30.123Z or 2011-12-03T10:15:30+01:00) but does this
roughly 10 times faster than DateTimeFormatter and 5 times
faster than the FastDateParser of commons-lang3.
This commit is contained in:
Andreas Huber
2018-11-19 19:23:57 +01:00
parent 6f48a25d53
commit 218ea9ed68
5 changed files with 169 additions and 6 deletions
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6
pdb-ui/src/main/java/org/lucares/pdbui/CsvToEntryTransformer.java
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@@ -2,13 +2,13 @@ package org.lucares.pdbui;
import java.io.IOException;
import java.time.OffsetDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Optional;
import java.util.regex.Pattern;
import org.lucares.pdb.api.Entry;
import org.lucares.pdb.api.Tags;
import org.lucares.pdb.api.TagsBuilder;
import org.lucares.pdbui.date.FastISODateParser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@@ -28,7 +28,7 @@ public class CsvToEntryTransformer implements LineToEntryTransformer {
try {
final String[] columns = splitPattern.split(line);
if (columns.length == headers.length) {
if (columns.length == headers.length && !columns[0].startsWith("@")) {
result = createEntry(columns);
@@ -51,7 +51,7 @@ public class CsvToEntryTransformer implements LineToEntryTransformer {
switch (headers[i]) {
case "@timestamp":
date = OffsetDateTime.parse(columns[i], DateTimeFormatter.ISO_ZONED_DATE_TIME);
date = FastISODateParser.parse(columns[i]);
break;
case "duration":
duration = Long.parseLong(columns[i]);

4
pdb-ui/src/main/java/org/lucares/pdbui/JsonToEntryTransformer.java
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@@ -2,13 +2,13 @@ package org.lucares.pdbui;
import java.io.IOException;
import java.time.OffsetDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Map;
import java.util.Optional;
import org.lucares.pdb.api.Entry;
import org.lucares.pdb.api.Tags;
import org.lucares.pdb.api.TagsBuilder;
import org.lucares.pdbui.date.FastISODateParser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@@ -86,7 +86,7 @@ public class JsonToEntryTransformer implements LineToEntryTransformer {
private OffsetDateTime getDate(final Map<String, Object> map) {
final String timestamp = (String) map.get("@timestamp");
final OffsetDateTime date = OffsetDateTime.parse(timestamp, DateTimeFormatter.ISO_ZONED_DATE_TIME);
final OffsetDateTime date = FastISODateParser.parse(timestamp);
return date;
}

77
pdb-ui/src/main/java/org/lucares/pdbui/date/FastISODateParser.java Normal file
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@@ -0,0 +1,77 @@
package org.lucares.pdbui.date;
import java.time.OffsetDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
/**
* A specialized date parser that can only handle ISO-8601 like dates
* (2011-12-03T10:15:30.123Z or 2011-12-03T10:15:30+01:00) but does this roughly
* 10 times faster than {@link DateTimeFormatter} and 5 times faster than the
* FastDateParser of commons-lang3.
*/
public class FastISODateParser {
/**
* Parsing ISO-8601 like dates, e.g. 2011-12-03T10:15:30.123Z or
* 2011-12-03T10:15:30+01:00.
*
* @param date in ISO-8601 format
* @return {@link OffsetDateTime}
*/
public static OffsetDateTime parse(final String date) {
try {
final int year = Integer.parseInt(date, 0, 4, 10);
final int month = Integer.parseInt(date, 5, 7, 10);
final int dayOfMonth = Integer.parseInt(date, 8, 10, 10);
final int hour = Integer.parseInt(date, 11, 13, 10);
final int minute = Integer.parseInt(date, 14, 16, 10);
final int second = Integer.parseInt(date, 17, 19, 10);
final int[] nanosAndCharsRead = parseMilliseconds(date, 19);
final int nanos = nanosAndCharsRead[0];
final int offsetTimezone = 19 + nanosAndCharsRead[1];
final ZoneOffset offset = date.charAt(offsetTimezone) == 'Z' ? ZoneOffset.UTC
: parseZone(date.subSequence(offsetTimezone, date.length()));
return OffsetDateTime.of(year, month, dayOfMonth, hour, minute, second, nanos, offset);
} catch (final RuntimeException e) {
throw new IllegalArgumentException("'" + date + "' is not an ISO-8601 that can be parsed with "
+ FastISODateParser.class.getCanonicalName(), e);
}
}
private static int[] parseMilliseconds(final String date, final int start) {
int result = 0;
int i = start;
while (i < date.length()) {
final char c = date.charAt(i);
i++;
if (c == '.') {
continue;
}
if (c < '0' || c > '9') {
break;
}
result = result * 10 + (c - '0');
}
final int readChars = i - start - 1;
while (i <= start + 10) {
result *= 10;
i++;
}
return new int[] { result, readChars };
}
private static ZoneOffset parseZone(final CharSequence zoneString) {
final int hours = Integer.parseInt(zoneString, 0, 3, 10);
int minutes = Integer.parseInt(zoneString, 4, 6, 10);
// if hours is negative,then minutes must be too
minutes = (hours < 0 ? -1 : 1) * minutes;
return ZoneOffset.ofHoursMinutes(hours, minutes);
}
}

86
pdb-ui/src/test/java/org/lucares/pdbui/date/FastISODateParserTest.java Normal file
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@@ -0,0 +1,86 @@
package org.lucares.pdbui.date;
import java.time.OffsetDateTime;
import java.time.format.DateTimeFormatter;
import org.testng.Assert;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
@Test
public class FastISODateParserTest {
@DataProvider(name = "providerValidDate")
public Object[][] providerValidDate() {
return new Object[][] { //
{ "2018-11-18T14:42:49.123456789Z" }, //
{ "2018-11-18T14:42:49.123456789+12:34" }, //
{ "2018-11-18T14:42:49.12345678Z" }, //
{ "2018-11-18T14:42:49.12345678+12:34" }, //
{ "2018-11-18T14:42:49.1234567Z" }, //
{ "2018-11-18T14:42:49.1234567+12:34" }, //
{ "2018-11-18T14:42:49.123456Z" }, //
{ "2018-11-18T14:42:49.123456+12:34" }, //
{ "2018-11-18T14:42:49.33256Z" }, //
{ "2018-11-18T14:42:49.33256+12:34" }, //
{ "2018-11-18T14:42:49.3325Z" }, //
{ "2018-11-18T14:42:49.3325+12:34" }, //
{ "2018-11-18T14:42:49.332Z" }, //
{ "2018-11-18T14:42:49.332+00:00" }, //
{ "2018-11-18T14:42:49.332+12:34" }, //
{ "2018-11-18T14:42:49.332-01:23" }, //
{ "2018-11-18T14:55:49.44Z" }, //
{ "2018-11-18T14:55:49.55-01:23" }, //
{ "2018-11-18T14:55:49.4Z" }, //
{ "2018-11-18T14:55:49.5-01:23" }, //
{ "2018-11-18T14:55:49.Z" }, //
{ "2018-11-18T14:55:49.-01:23" }, //
{ "2018-11-18T14:55:49Z" }, //
{ "2018-11-18T14:55:49-01:23" },//
};
}
@Test(dataProvider = "providerValidDate")
public void testParseValidDate(final String date) {
final OffsetDateTime actualDate = FastISODateParser.parse(date);
final OffsetDateTime expectedDate = OffsetDateTime.from(DateTimeFormatter.ISO_DATE_TIME.parse(date));
Assert.assertEquals(actualDate, expectedDate);
}
@DataProvider(name = "providerParseInvalidDate")
public Object[][] providerParseInvalidDate() {
return new Object[][] { //
{ "a2018-11-18T14:42:49.332Z" }, //
{ "a018-11-18T14:42:49.332Z" }, //
{ "2a18-11-18T14:42:49.332Z" }, //
{ "20a8-11-18T14:42:49.332Z" }, //
{ "201a-11-18T14:42:49.332Z" }, //
{ "2018-a1-18T14:42:49.332Z" }, //
{ "2018-1a-18T14:42:49.332Z" }, //
{ "2018-11-a8T14:42:49.332Z" }, //
{ "2018-11-1aT14:42:49.332Z" }, //
{ "2018-11-18Ta4:42:49.332Z" }, //
{ "2018-11-18T1a:42:49.332Z" }, //
{ "2018-11-18T14:a2:49.332Z" }, //
{ "2018-11-18T14:4a:49.332Z" }, //
{ "2018-11-18T14:42:a9.332Z" }, //
{ "2018-11-18T14:42:4a.332Z" }, //
{ "2018-11-18T14:42:49.a32Z" }, //
{ "2018-11-18T14:42:49.3a2Z" }, //
{ "2018-11-18T14:42:49.33aZ" }, //
{ "2018-11-18T14:42:49.332a" }, //
{ "2018-11-18T14:42:49.332a00:00" }, //
{ "2018-11-18T14:42:49.332+a0:00" }, //
{ "2018-11-18T14:42:49.332+0a:00" }, //
{ "2018-11-18T14:42:49.332+00:a0" }, //
{ "2018-11-18T14:42:49.332+00:0a" }//
};
}
@Test(expectedExceptions = IllegalArgumentException.class, dataProvider = "providerParseInvalidDate")
public void testParseInvalidDate(final String invalidDate) {
FastISODateParser.parse(invalidDate);
}
}