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From vlsi <...@git.apache.org>
Subject [GitHub] jmeter pull request #291: Add time shifting function
Date Thu, 27 Apr 2017 13:51:36 GMT
Github user vlsi commented on a diff in the pull request:

    https://github.com/apache/jmeter/pull/291#discussion_r113697784
  
    --- Diff: src/functions/org/apache/jmeter/functions/TimeShift.java ---
    @@ -0,0 +1,188 @@
    +/*
    + * 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.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 java.util.regex.Matcher;
    +import java.util.regex.Pattern;
    +
    +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;
    +
    +/**
    + * 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 Pattern pattern = Pattern.compile("(?:((?:[+-])?\\d+)([MdHms]))");
    +    
    +    public TimeShift() {
    +        super();
    +    }
    +
    +    /** {@inheritDoc} */
    +    @Override
    +    public String execute(SampleResult previousResult, Sampler currentSampler) throws
InvalidVariableException {
    +        String dateString;
    +        LocalDateTime localDateTimeToShift = LocalDateTime.now(ZoneId.systemDefault());
    --- End diff --
    
    `ZoneId.systemDefault` is not a trivial method, so it makes sense to cache the outcome
at least for the duration of the method


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