Github user ben-manes commented on a diff in the pull request: https://github.com/apache/jmeter/pull/291#discussion_r113822733 --- Diff: src/functions/org/apache/jmeter/functions/TimeShift.java --- @@ -0,0 +1,186 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + */ + +package org.apache.jmeter.functions; + +import java.time.Duration; +import java.time.Instant; +import java.time.LocalDateTime; +import java.time.Year; +import java.time.ZoneId; +import java.time.ZoneOffset; +import java.time.format.DateTimeFormatter; +import java.time.format.DateTimeFormatterBuilder; +import java.time.format.DateTimeParseException; +import java.time.temporal.ChronoField; +import java.util.Arrays; +import java.util.Collection; +import java.util.List; + +import org.apache.commons.lang3.StringUtils; +import org.apache.jmeter.engine.util.CompoundVariable; +import org.apache.jmeter.samplers.SampleResult; +import org.apache.jmeter.samplers.Sampler; +import org.apache.jmeter.threads.JMeterVariables; +import org.apache.jmeter.util.JMeterUtils; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import com.github.benmanes.caffeine.cache.Cache; +import com.github.benmanes.caffeine.cache.Caffeine; + +/** + * timeShifting Function permit to shift a date + * + * Parameters: - format date @see + * https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html + * (optional - defaults to epoch time in millisecond) - date to shift formated + * as first param (optional - defaults now) - amount of (seconds, minutes, + * hours, days or months ) to add (optional - default nothing is add ) - + * variable name ( optional ) + * + * Returns: a formatted date with the specified number of (seconds, minutes, + * hours, days or months ) added. - value is also saved in the variable for + * later re-use. + * + * @since 3.3 + */ +public class TimeShift extends AbstractFunction { + private static final Logger log = LoggerFactory.getLogger(TimeShift.class); + + private static final String KEY = "__timeShift"; // $NON-NLS-1$ + + private static final List<String> desc = Arrays.asList(JMeterUtils.getResString("time_format_shift"), + JMeterUtils.getResString("date_to_shift"), JMeterUtils.getResString("value_to_shift"), + JMeterUtils.getResString("function_name_paropt")); + + // Ensure that these are set, even if no paramters are provided + private String format = ""; //$NON-NLS-1$ + private String dateToShift = ""; //$NON-NLS-1$ + private String amountToShift = ""; //$NON-NLS-1$ + private String variableName = ""; //$NON-NLS-1$ + private ZoneId systemDefaultZoneID = ZoneId.systemDefault(); + + /** Date time format cache handler **/ + private Cache<Object, Object> dateTimeFormatterCache = null; + + public TimeShift() { + super(); + } + + /** {@inheritDoc} */ + @Override + public String execute(SampleResult previousResult, Sampler currentSampler) throws InvalidVariableException { + String dateString; + LocalDateTime localDateTimeToShift = LocalDateTime.now(systemDefaultZoneID); + DateTimeFormatter formatter = null; + if (!StringUtils.isEmpty(format)) { + try { + formatter = (DateTimeFormatter) dateTimeFormatterCache.get(format, key -> createFormatter((String)key)); + } catch (IllegalArgumentException ex) { + log.error("Format date pattern '{}' is invalid (see https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html)", format, ex); // $NON-NLS-1$ + return ""; + } + } + + if (!dateToShift.isEmpty()) { + try { + if (formatter != null) { + localDateTimeToShift = LocalDateTime.parse(dateToShift, formatter); + } else { + localDateTimeToShift = LocalDateTime.ofInstant(Instant.ofEpochMilli(Long.parseLong(dateToShift)), + ZoneId.systemDefault()); + } + } catch (DateTimeParseException | NumberFormatException ex) { + log.error("Failed to parse the date '{}' to shift", dateToShift, ex); // $NON-NLS-1$ + } + } + + // Check amount value to shift + if (!StringUtils.isEmpty(amountToShift)) { + try { + Duration duration = Duration.parse(amountToShift); + localDateTimeToShift = localDateTimeToShift.plus(duration); + } catch (DateTimeParseException ex) { + log.error("Failed to parse the amount duration '{}' to shift (see https://docs.oracle.com/javase/8/docs/api/java/time/Duration.html#parse-java.lang.CharSequence-) ", amountToShift, ex); // $NON-NLS-1$ + } + } + + if (formatter != null) { + dateString = localDateTimeToShift.format(formatter); + } else { + ZoneOffset offset = ZoneOffset.systemDefault().getRules().getOffset(localDateTimeToShift); + dateString = String.valueOf(localDateTimeToShift.toInstant(offset).toEpochMilli()); + } + + if (!StringUtils.isEmpty(variableName)) { + JMeterVariables vars = getVariables(); + if (vars != null) {// vars will be null on TestPlan + vars.put(variableName, dateString); + } + } + return dateString; + } + + private DateTimeFormatter createFormatter(String format) throws IllegalArgumentException { + + log.debug("Create a new instance of DateTimeFormatter for format '{}' in the cache", format); + return new DateTimeFormatterBuilder().appendPattern(format).parseDefaulting(ChronoField.NANO_OF_SECOND, 0) + .parseDefaulting(ChronoField.MILLI_OF_SECOND, 0).parseDefaulting(ChronoField.SECOND_OF_MINUTE, 0) + .parseDefaulting(ChronoField.MINUTE_OF_HOUR, 0).parseDefaulting(ChronoField.HOUR_OF_DAY, 0) + .parseDefaulting(ChronoField.DAY_OF_MONTH, 1).parseDefaulting(ChronoField.MONTH_OF_YEAR, 1) + .parseDefaulting(ChronoField.YEAR_OF_ERA, Year.now().getValue()).toFormatter(JMeterUtils.getLocale()); + } + + protected static Cache<Object, Object> buildCache() { --- End diff -- You can make this typesafe by returning `Cache<String, DateTimeFormatter>`. The generics are inferred at the `build()` step rather than construction, which might have caused confusion.
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