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/*
* Copyright 2014-2021 Ping Identity Corporation
* All Rights Reserved.
*/
/*
* Copyright 2014-2021 Ping Identity Corporation
*
* Licensed 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.
*/
/*
* Copyright (C) 2014-2021 Ping Identity Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (GPLv2 only)
* or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see .
*/
package com.unboundid.util;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Reader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.regex.Pattern;
import com.unboundid.util.args.ArgumentException;
import com.unboundid.util.args.DurationArgument;
import static com.unboundid.util.UtilityMessages.*;
/**
* This class allows a FixedRateBarrier to change dynamically. The rate changes
* are governed by lines read from a {@code Reader} (typically backed by a
* file). The input starts with a header that provides some global options and
* then has a list of lines, where each line contains a single rate per second,
* a comma, and a duration to maintain that rate. Rates are specified as an
* absolute rate per second or as a rate relative to the base rate per second.
* The duration is an integer followed by a time unit (ms=milliseconds,
* s=seconds, m=minutes, h=hours, and d=days).
*
* The following simple example will run at a target rate of 1000 per second
* for one minute, and then 10000 per second for 10 seconds.
*
* # format=rate-duration
* 1000,1m
* 10000,10s
*
*
* The following example has a default duration of one minute, and will repeat
* the two intervals until this RateAdjustor is shut down. The first interval
* is run for the default of 1 minute at two and half times the base rate, and
* then run for 10 seconds at 10000 per second.
*
* A {@code RateAdjustor} is a daemon thread. It is necessary to call the
* {@code start()} method to start the thread and begin the rate changes.
* Once this finished processing the rates, the thread will complete.
* It can be stopped prematurely by calling {@code shutDown()}.
*
* The header can contain the following options:
*
*
{@code format} (required): This must currently have the value
* {@code rate-duration}.
*
{@code default-duration} (optional): This can specify a default
* duration for intervals that do not include a duration. The format
* is an integer followed by a time unit as described above.
*
{@code repeat} (optional): If this has a value of {@code true}, then
* the rates in the input will be repeated until {@code shutDown()} is
* called.
*
*/
@ThreadSafety(level = ThreadSafetyLevel.MOSTLY_THREADSAFE)
public final class RateAdjustor extends Thread
{
/**
* This starts a comment in the input.
*/
public static final char COMMENT_START = '#';
/**
* The text that must appear on a line by itself in order to denote that the
* end of the file header has been reached.
*/
@NotNull public static final String END_HEADER_TEXT = "END HEADER";
/**
* The header key that represents the default duration.
*/
@NotNull public static final String DEFAULT_DURATION_KEY = "default-duration";
/**
* The header key that represents the format of the file.
*/
@NotNull public static final String FORMAT_KEY = "format";
/**
* The value of the format key that represents a list of rates and durations
* within the input file.
*/
@NotNull public static final String FORMAT_VALUE_RATE_DURATION =
"rate-and-duration";
/**
* A list of all formats that we support.
*/
@NotNull public static final List FORMATS =
Collections.singletonList(FORMAT_VALUE_RATE_DURATION);
/**
* The header key that represents whether the input should be repeated.
*/
@NotNull public static final String REPEAT_KEY = "repeat";
/**
* A list of all header keys that we support.
*/
@NotNull public static final List KEYS =
Arrays.asList(DEFAULT_DURATION_KEY, FORMAT_KEY, REPEAT_KEY);
// Other headers to consider:
// * rate-multiplier, so you can easily proportionally increase or decrease
// every target rate without changing all the target rates directly.
// * duration-multiplier, so you can easily proportionally increase or
// decrease the length of time to spend at target rates.
// * rate-change-behavior, so you can specify the behavior that should be
// exhibited when transitioning from one rate to another (e.g., instant
// jump, linear acceleration, sine-based acceleration, etc.).
// * jitter, so we can introduce some amount of random jitter in the target
// rate (in which the actual target rate may be frequently adjusted to be
// slightly higher or lower than the designated target rate).
// * spike, so we can introduce periodic, substantial increases in the target
// rate.
// The barrier whose rate is adjusted.
@NotNull private final FixedRateBarrier barrier;
// A list of rates per second and the number of milliseconds that the
// specified rate should be maintained.
@NotNull private final List> ratesAndDurations;
// If this is true, then the ratesAndDurations will be repeated until this is
// shut down.
private final boolean repeat;
// Set to true when this should shut down.
private volatile boolean shutDown = false;
// This is used to make sure we set the initial rate before start() returns.
@NotNull private final CountDownLatch initialRateSetLatch =
new CountDownLatch(1);
// This allows us to interrupt when we are sleeping.
@NotNull private final WakeableSleeper sleeper = new WakeableSleeper();
/**
* Returns a new RateAdjustor with the specified parameters. See the
* class-level javadoc for more information.
*
* @param barrier The barrier to update based on the specified
* rates.
* @param baseRatePerSecond The baseline rate per second, or {@code null}
* if none was specified.
* @param rates A file containing a list of rates and durations
* as described in the class-level javadoc.
*
* @return A new RateAdjustor constructed from the specified parameters.
*
* @throws IOException If there is a problem reading from
* the rates Reader.
* @throws IllegalArgumentException If there is a problem with the rates
* input.
*/
@NotNull()
public static RateAdjustor newInstance(
@NotNull final FixedRateBarrier barrier,
@Nullable final Integer baseRatePerSecond,
@NotNull final File rates)
throws IOException, IllegalArgumentException
{
final Reader reader = new FileReader(rates);
return new RateAdjustor(
barrier,
(baseRatePerSecond == null) ? 0 : baseRatePerSecond,
reader);
}
/**
* Retrieves a string that may be used as the description of the argument that
* specifies the path to a variable rate data file for use in conjunction with
* this rate adjustor.
*
* @param genArgName The name of the argument that may be used to generate a
* sample variable rate data file.
*
* @return A string that may be used as the description of the argument that
* specifies the path to a variable rate data file for use in
* conjunction with this rate adjustor.
*/
@Nullable()
public static String getVariableRateDataArgumentDescription(
@NotNull final String genArgName)
{
return INFO_RATE_ADJUSTOR_VARIABLE_RATE_DATA_ARG_DESCRIPTION.get(
genArgName);
}
/**
* Retrieves a string that may be used as the description of the argument that
* generates a sample variable rate data file that serves as documentation of
* the variable rate data format.
*
* @param dataFileArgName The name of the argument that specifies the path
* to a file
*
* @return A string that may be used as the description of the argument that
* generates a sample variable rate data file that serves as
* documentation of the variable rate data format.
*/
@Nullable()
public static String getGenerateSampleVariableRateFileDescription(
@NotNull final String dataFileArgName)
{
return INFO_RATE_ADJUSTOR_GENERATE_SAMPLE_RATE_FILE_ARG_DESCRIPTION.get(
dataFileArgName);
}
/**
* Writes a sample variable write data file to the specified location.
*
* @param f The path to the file to be written.
*
* @throws IOException If a problem is encountered while writing to the
* specified file.
*/
public static void writeSampleVariableRateFile(@NotNull final File f)
throws IOException
{
final PrintWriter w = new PrintWriter(f);
try
{
w.println("# This is an example variable rate data file. All blank " +
"lines will be ignored.");
w.println("# All lines starting with the '#' character are considered " +
"comments and will");
w.println("# also be ignored.");
w.println();
w.println("# The beginning of the file must be a header containing " +
"properties pertaining");
w.println("# to the variable rate data. All headers must be in the " +
"format 'name=value',");
w.println("# in which any spaces surrounding the equal sign will be " +
"ignored.");
w.println();
w.println("# The first header should be the 'format' header, which " +
"specifies the format");
w.println("# for the variable rate data file. This header is " +
"required. At present, the");
w.println("# only supported format is 'rate-and-duration', although " +
"additional formats may");
w.println("# be added in the future.");
w.println("format = rate-and-duration");
w.println();
w.println("# The optional 'default-duration' header may be used to " +
"specify a duration that");
w.println("# will be used for any interval that does not explicitly " +
"specify a duration.");
w.println("# The duration must consist of a positive integer value " +
"followed by a time");
w.println("# unit (with zero or more spaces separating the integer " +
"value from the unit).");
w.println("# The supported time units are:");
w.println("#");
w.println("# - nanoseconds, nanosecond, nanos, nano, ns");
w.println("# - microseconds, microseconds, micros, micro, us");
w.println("# - milliseconds, millisecond, millis, milli, ms");
w.println("# - seconds, second, secs, sec, s");
w.println("# - minutes, minute, mins, min, m");
w.println("# - hours, hour, hrs, hr, h");
w.println("# - days, day, d");
w.println("#");
w.println("# If no 'default-duration' header is present, then every " +
"data interval must");
w.println("# include an explicitly-specified duration.");
w.println("default-duration = 10 seconds");
w.println();
w.println("# The optional 'repeat' header may be used to indicate how " +
"the tool should");
w.println("# behave once the end of the variable rate data definitions " +
"has been reached.");
w.println("# If the 'repeat' header is present with a value of 'true', " +
"then the tool will");
w.println("# operate in an endless loop, returning to the beginning of " +
"the variable rate");
w.println("# definitions once the end has been reached. If the " +
"'repeat' header is present");
w.println("# with a value of 'false', or if the 'repeat' header is " +
"absent, then the tool");
w.println("# will exit after it has processed all of the variable " +
"rate definitions.");
w.println("repeat = true");
w.println();
w.println("# After all header properties have been specified, the end " +
"of the header must");
w.println("# be signified with a line containing only the text 'END " +
"HEADER'.");
w.println("END HEADER");
w.println();
w.println();
w.println("# After the header is complete, the variable rate " +
"definitions should be");
w.println("# provided. Each definition should be given on a line by " +
"itself, and should");
w.println("# contain a target rate per second and an optional length " +
"of time to maintain");
w.println("# that rate.");
w.println("#");
w.println("# The target rate must always be present in a variable " +
"rate definition. It may");
w.println("# be either a positive integer value that specifies the " +
"absolute target rate");
w.println("# per second (e.g., a value of '1000' indicates a target " +
"rate of 1000");
w.println("# operations per second), or it may be a floating-point " +
"value followed by the");
w.println("# letter 'x' to indicate that it is a multiplier of the " +
"value specified by the");
w.println("# '--ratePerSecond' argument (e.g., if the " +
"'--ratePerSecond' argument is");
w.println("# present with a value of 1000, then a target rate value " +
"of '0.75x' indicates a");
w.println("# target rate that is 75% of the '--ratePerSecond' value, " +
"or 750 operations per");
w.println("# second). If the latter format is used, then the " +
"'--ratePerSecond' argument");
w.println("# must be provided.");
w.println("#");
w.println("# The duration may optionally be present in a variable " +
"rate definition. If");
w.println("# present, it must be separated from the target rate by a " +
"comma (and there may");
w.println("# be zero or more spaces on either side of the comma). " +
"The duration must be in");
w.println("# the same format as specified in the description of the " +
"'default-duration'");
w.println("# header above (i.e., a positive integer followed by a " +
"time unit). If a");
w.println("# variable rate definition does not include a duration, " +
"then the");
w.println("# 'default-duration' header must have been specified, and " +
"that default duration");
w.println("# will be used for that variable rate definition.");
w.println("#");
w.println("# The following variable rate definitions may be used to " +
"stairstep the target");
w.println("# rate from 1000 operations per second to 10000 operations " +
"per second, in");
w.println("# increments of 1000 operations per second, spending one " +
"minute at each level.");
w.println("# If the 'repeat' header is present with a value of 'true', " +
"then the process");
w.println("# will start back over at 1000 operations per second after " +
"completing one");
w.println("# minute at 10000 operations per second. Otherwise, the " +
"tool will exit after");
w.println("# completing the 10000 operation-per-second interval.");
w.println("1000, 1 minute");
w.println("2000, 1 minute");
w.println("3000, 1 minute");
w.println("4000, 1 minute");
w.println("5000, 1 minute");
w.println("6000, 1 minute");
w.println("7000, 1 minute");
w.println("8000, 1 minute");
w.println("9000, 1 minute");
w.println("10000, 1 minute");
w.println();
w.println();
w.println("# Additional sample rate definitions that represent common " +
"load patterns are");
w.println("# provided below. Each of these patterns makes use of the " +
"relative format for");
w.println("# the target rate and therefore require the " +
"'--ratePerSecond' argument to");
w.println("# specify the target rate. These sample rate definitions " +
"are commented out to");
w.println("# prevent them from being interpreted by default.");
w.println();
w.println();
w.println("# Example: Square Rate");
w.println("#");
w.println("# This pattern starts with a rate of zero operations per " +
"second, then");
w.println("# immediately jumps to a rate of 100% of the target rate. " +
"A graph of the load");
w.println("# generated by repeating iterations of this pattern " +
"represents a series of");
w.println("# squares that are alternately missing the top and bottom " +
"edges.");
w.println("#");
w.println("#0.00x");
w.println("#1.00x");
w.println();
w.println();
w.println("# Example: Stairstep Rate");
w.println("#");
w.println("# This pattern starts with a rate that is 10% of the target " +
"rate, then jumps to");
w.println("# 20% of the target rate, then 30%, 40%, 50%, etc. until it " +
"reaches 100% of the");
w.println("# target rate. A graph of the load generated by a single " +
"iteration of this");
w.println("# pattern represents a series of stair steps.");
w.println("#");
w.println("#0.1x");
w.println("#0.2x");
w.println("#0.3x");
w.println("#0.4x");
w.println("#0.5x");
w.println("#0.6x");
w.println("#0.7x");
w.println("#0.8x");
w.println("#0.9x");
w.println("#1.0x");
w.println();
w.println();
w.println("# Example: Sine Rate");
w.println("#");
w.println("# This pattern starts with a rate of zero operations per " +
"second and increases");
w.println("# to # 100% of the target rate in a pattern that is gradual " +
"at first, rapid in");
w.println("# the middle, and then gradual again at the end, and then " +
"decreases back to");
w.println("# zero in a mirror image of the ascent. A graph of the " +
"load generated by this");
w.println("# pattern resembles a sine wave, but starting at the " +
"lowest point in the trough");
w.println("# of the wave (mathematically, represented by the function " +
"'y=sin(x-pi/2)+1').");
w.println("#");
w.println("#0.000x");
w.println("#0.001x");
w.println("#0.002x");
w.println("#0.004x");
w.println("#0.006x");
w.println("#0.009x");
w.println("#0.012x");
w.println("#0.016x");
w.println("#0.020x");
w.println("#0.024x");
w.println("#0.030x");
w.println("#0.035x");
w.println("#0.041x");
w.println("#0.048x");
w.println("#0.054x");
w.println("#0.062x");
w.println("#0.070x");
w.println("#0.078x");
w.println("#0.086x");
w.println("#0.095x");
w.println("#0.105x");
w.println("#0.115x");
w.println("#0.125x");
w.println("#0.136x");
w.println("#0.146x");
w.println("#0.158x");
w.println("#0.169x");
w.println("#0.181x");
w.println("#0.194x");
w.println("#0.206x");
w.println("#0.219x");
w.println("#0.232x");
w.println("#0.245x");
w.println("#0.259x");
w.println("#0.273x");
w.println("#0.287x");
w.println("#0.301x");
w.println("#0.316x");
w.println("#0.331x");
w.println("#0.345x");
w.println("#0.361x");
w.println("#0.376x");
w.println("#0.391x");
w.println("#0.406x");
w.println("#0.422x");
w.println("#0.437x");
w.println("#0.453x");
w.println("#0.469x");
w.println("#0.484x");
w.println("#0.500x");
w.println("#0.500x");
w.println("#0.516x");
w.println("#0.531x");
w.println("#0.547x");
w.println("#0.563x");
w.println("#0.578x");
w.println("#0.594x");
w.println("#0.609x");
w.println("#0.624x");
w.println("#0.639x");
w.println("#0.655x");
w.println("#0.669x");
w.println("#0.684x");
w.println("#0.699x");
w.println("#0.713x");
w.println("#0.727x");
w.println("#0.741x");
w.println("#0.755x");
w.println("#0.768x");
w.println("#0.781x");
w.println("#0.794x");
w.println("#0.806x");
w.println("#0.819x");
w.println("#0.831x");
w.println("#0.842x");
w.println("#0.854x");
w.println("#0.864x");
w.println("#0.875x");
w.println("#0.885x");
w.println("#0.895x");
w.println("#0.905x");
w.println("#0.914x");
w.println("#0.922x");
w.println("#0.930x");
w.println("#0.938x");
w.println("#0.946x");
w.println("#0.952x");
w.println("#0.959x");
w.println("#0.965x");
w.println("#0.970x");
w.println("#0.976x");
w.println("#0.980x");
w.println("#0.984x");
w.println("#0.988x");
w.println("#0.991x");
w.println("#0.994x");
w.println("#0.996x");
w.println("#0.998x");
w.println("#0.999x");
w.println("#1.000x");
w.println("#1.000x");
w.println("#1.000x");
w.println("#0.999x");
w.println("#0.998x");
w.println("#0.996x");
w.println("#0.994x");
w.println("#0.991x");
w.println("#0.988x");
w.println("#0.984x");
w.println("#0.980x");
w.println("#0.976x");
w.println("#0.970x");
w.println("#0.965x");
w.println("#0.959x");
w.println("#0.952x");
w.println("#0.946x");
w.println("#0.938x");
w.println("#0.930x");
w.println("#0.922x");
w.println("#0.914x");
w.println("#0.905x");
w.println("#0.895x");
w.println("#0.885x");
w.println("#0.875x");
w.println("#0.864x");
w.println("#0.854x");
w.println("#0.842x");
w.println("#0.831x");
w.println("#0.819x");
w.println("#0.806x");
w.println("#0.794x");
w.println("#0.781x");
w.println("#0.768x");
w.println("#0.755x");
w.println("#0.741x");
w.println("#0.727x");
w.println("#0.713x");
w.println("#0.699x");
w.println("#0.684x");
w.println("#0.669x");
w.println("#0.655x");
w.println("#0.639x");
w.println("#0.624x");
w.println("#0.609x");
w.println("#0.594x");
w.println("#0.578x");
w.println("#0.563x");
w.println("#0.547x");
w.println("#0.531x");
w.println("#0.516x");
w.println("#0.500x");
w.println("#0.484x");
w.println("#0.469x");
w.println("#0.453x");
w.println("#0.437x");
w.println("#0.422x");
w.println("#0.406x");
w.println("#0.391x");
w.println("#0.376x");
w.println("#0.361x");
w.println("#0.345x");
w.println("#0.331x");
w.println("#0.316x");
w.println("#0.301x");
w.println("#0.287x");
w.println("#0.273x");
w.println("#0.259x");
w.println("#0.245x");
w.println("#0.232x");
w.println("#0.219x");
w.println("#0.206x");
w.println("#0.194x");
w.println("#0.181x");
w.println("#0.169x");
w.println("#0.158x");
w.println("#0.146x");
w.println("#0.136x");
w.println("#0.125x");
w.println("#0.115x");
w.println("#0.105x");
w.println("#0.095x");
w.println("#0.086x");
w.println("#0.078x");
w.println("#0.070x");
w.println("#0.062x");
w.println("#0.054x");
w.println("#0.048x");
w.println("#0.041x");
w.println("#0.035x");
w.println("#0.030x");
w.println("#0.024x");
w.println("#0.020x");
w.println("#0.016x");
w.println("#0.012x");
w.println("#0.009x");
w.println("#0.006x");
w.println("#0.004x");
w.println("#0.002x");
w.println("#0.001x");
w.println("#0.000x");
w.println();
w.println();
w.println("# Example: Sawtooth Rate");
w.println("#");
w.println("# This pattern starts with a rate of zero operations per " +
"second and increases");
w.println("# linearly to 100% of the target rate. A graph of the load " +
"generated by a");
w.println("# single iteration of this pattern resembles the hypotenuse " +
"of a right");
w.println("# triangle, and a graph of multiple iterations resembles " +
"the teeth of a saw");
w.println("# blade.");
w.println("#");
w.println("#0.00x");
w.println("#0.01x");
w.println("#0.02x");
w.println("#0.03x");
w.println("#0.04x");
w.println("#0.05x");
w.println("#0.06x");
w.println("#0.07x");
w.println("#0.08x");
w.println("#0.09x");
w.println("#0.10x");
w.println("#0.11x");
w.println("#0.12x");
w.println("#0.13x");
w.println("#0.14x");
w.println("#0.15x");
w.println("#0.16x");
w.println("#0.17x");
w.println("#0.18x");
w.println("#0.19x");
w.println("#0.20x");
w.println("#0.21x");
w.println("#0.22x");
w.println("#0.23x");
w.println("#0.24x");
w.println("#0.25x");
w.println("#0.26x");
w.println("#0.27x");
w.println("#0.28x");
w.println("#0.29x");
w.println("#0.30x");
w.println("#0.31x");
w.println("#0.32x");
w.println("#0.33x");
w.println("#0.34x");
w.println("#0.35x");
w.println("#0.36x");
w.println("#0.37x");
w.println("#0.38x");
w.println("#0.39x");
w.println("#0.40x");
w.println("#0.41x");
w.println("#0.42x");
w.println("#0.43x");
w.println("#0.44x");
w.println("#0.45x");
w.println("#0.46x");
w.println("#0.47x");
w.println("#0.48x");
w.println("#0.49x");
w.println("#0.50x");
w.println("#0.51x");
w.println("#0.52x");
w.println("#0.53x");
w.println("#0.54x");
w.println("#0.55x");
w.println("#0.56x");
w.println("#0.57x");
w.println("#0.58x");
w.println("#0.59x");
w.println("#0.60x");
w.println("#0.61x");
w.println("#0.62x");
w.println("#0.63x");
w.println("#0.64x");
w.println("#0.65x");
w.println("#0.66x");
w.println("#0.67x");
w.println("#0.68x");
w.println("#0.69x");
w.println("#0.70x");
w.println("#0.71x");
w.println("#0.72x");
w.println("#0.73x");
w.println("#0.74x");
w.println("#0.75x");
w.println("#0.76x");
w.println("#0.77x");
w.println("#0.78x");
w.println("#0.79x");
w.println("#0.80x");
w.println("#0.81x");
w.println("#0.82x");
w.println("#0.83x");
w.println("#0.84x");
w.println("#0.85x");
w.println("#0.86x");
w.println("#0.87x");
w.println("#0.88x");
w.println("#0.89x");
w.println("#0.90x");
w.println("#0.91x");
w.println("#0.92x");
w.println("#0.93x");
w.println("#0.94x");
w.println("#0.95x");
w.println("#0.96x");
w.println("#0.97x");
w.println("#0.98x");
w.println("#0.99x");
w.println("#1.00x");
w.println();
w.println();
w.println("# Example: Triangle Rate");
w.println("#");
w.println("# This pattern starts with a rate of zero operations per " +
"second and increases");
w.println("# linearly to 100% of the target rate before decreasing " +
"linearly back to 0%.");
w.println("# A graph of the load generated by a single iteration of " +
"this tool is like that");
w.println("# of the sawtooth pattern above followed immediately by its " +
"mirror image.");
w.println("#");
w.println("#0.00x");
w.println("#0.01x");
w.println("#0.02x");
w.println("#0.03x");
w.println("#0.04x");
w.println("#0.05x");
w.println("#0.06x");
w.println("#0.07x");
w.println("#0.08x");
w.println("#0.09x");
w.println("#0.10x");
w.println("#0.11x");
w.println("#0.12x");
w.println("#0.13x");
w.println("#0.14x");
w.println("#0.15x");
w.println("#0.16x");
w.println("#0.17x");
w.println("#0.18x");
w.println("#0.19x");
w.println("#0.20x");
w.println("#0.21x");
w.println("#0.22x");
w.println("#0.23x");
w.println("#0.24x");
w.println("#0.25x");
w.println("#0.26x");
w.println("#0.27x");
w.println("#0.28x");
w.println("#0.29x");
w.println("#0.30x");
w.println("#0.31x");
w.println("#0.32x");
w.println("#0.33x");
w.println("#0.34x");
w.println("#0.35x");
w.println("#0.36x");
w.println("#0.37x");
w.println("#0.38x");
w.println("#0.39x");
w.println("#0.40x");
w.println("#0.41x");
w.println("#0.42x");
w.println("#0.43x");
w.println("#0.44x");
w.println("#0.45x");
w.println("#0.46x");
w.println("#0.47x");
w.println("#0.48x");
w.println("#0.49x");
w.println("#0.50x");
w.println("#0.51x");
w.println("#0.52x");
w.println("#0.53x");
w.println("#0.54x");
w.println("#0.55x");
w.println("#0.56x");
w.println("#0.57x");
w.println("#0.58x");
w.println("#0.59x");
w.println("#0.60x");
w.println("#0.61x");
w.println("#0.62x");
w.println("#0.63x");
w.println("#0.64x");
w.println("#0.65x");
w.println("#0.66x");
w.println("#0.67x");
w.println("#0.68x");
w.println("#0.69x");
w.println("#0.70x");
w.println("#0.71x");
w.println("#0.72x");
w.println("#0.73x");
w.println("#0.74x");
w.println("#0.75x");
w.println("#0.76x");
w.println("#0.77x");
w.println("#0.78x");
w.println("#0.79x");
w.println("#0.80x");
w.println("#0.81x");
w.println("#0.82x");
w.println("#0.83x");
w.println("#0.84x");
w.println("#0.85x");
w.println("#0.86x");
w.println("#0.87x");
w.println("#0.88x");
w.println("#0.89x");
w.println("#0.90x");
w.println("#0.91x");
w.println("#0.92x");
w.println("#0.93x");
w.println("#0.94x");
w.println("#0.95x");
w.println("#0.96x");
w.println("#0.97x");
w.println("#0.98x");
w.println("#0.99x");
w.println("#1.00x");
w.println("#0.99x");
w.println("#0.98x");
w.println("#0.97x");
w.println("#0.96x");
w.println("#0.95x");
w.println("#0.94x");
w.println("#0.93x");
w.println("#0.92x");
w.println("#0.91x");
w.println("#0.90x");
w.println("#0.89x");
w.println("#0.88x");
w.println("#0.87x");
w.println("#0.86x");
w.println("#0.85x");
w.println("#0.84x");
w.println("#0.83x");
w.println("#0.82x");
w.println("#0.81x");
w.println("#0.80x");
w.println("#0.79x");
w.println("#0.78x");
w.println("#0.77x");
w.println("#0.76x");
w.println("#0.75x");
w.println("#0.74x");
w.println("#0.73x");
w.println("#0.72x");
w.println("#0.71x");
w.println("#0.70x");
w.println("#0.69x");
w.println("#0.68x");
w.println("#0.67x");
w.println("#0.66x");
w.println("#0.65x");
w.println("#0.64x");
w.println("#0.63x");
w.println("#0.62x");
w.println("#0.61x");
w.println("#0.60x");
w.println("#0.59x");
w.println("#0.58x");
w.println("#0.57x");
w.println("#0.56x");
w.println("#0.55x");
w.println("#0.54x");
w.println("#0.53x");
w.println("#0.52x");
w.println("#0.51x");
w.println("#0.50x");
w.println("#0.49x");
w.println("#0.48x");
w.println("#0.47x");
w.println("#0.46x");
w.println("#0.45x");
w.println("#0.44x");
w.println("#0.43x");
w.println("#0.42x");
w.println("#0.41x");
w.println("#0.40x");
w.println("#0.39x");
w.println("#0.38x");
w.println("#0.37x");
w.println("#0.36x");
w.println("#0.35x");
w.println("#0.34x");
w.println("#0.33x");
w.println("#0.32x");
w.println("#0.31x");
w.println("#0.30x");
w.println("#0.29x");
w.println("#0.28x");
w.println("#0.27x");
w.println("#0.26x");
w.println("#0.25x");
w.println("#0.24x");
w.println("#0.23x");
w.println("#0.22x");
w.println("#0.21x");
w.println("#0.20x");
w.println("#0.19x");
w.println("#0.18x");
w.println("#0.17x");
w.println("#0.16x");
w.println("#0.15x");
w.println("#0.14x");
w.println("#0.13x");
w.println("#0.12x");
w.println("#0.11x");
w.println("#0.10x");
w.println("#0.09x");
w.println("#0.08x");
w.println("#0.07x");
w.println("#0.06x");
w.println("#0.05x");
w.println("#0.04x");
w.println("#0.03x");
w.println("#0.02x");
w.println("#0.01x");
w.println("#0.00x");
w.println();
w.println();
w.println("# Example: 'Hockey Stick' Rate");
w.println("#");
w.println("# This pattern starts with a rate of zero operations per " +
"second and increases");
w.println("# slowly at first before ramping up much more quickly. A " +
"graph of the load");
w.println("# generated by a single iteration of this pattern vaguely " +
"resembles a hockey");
w.println("# stick.");
w.println("#");
w.println("#0.000x");
w.println("#0.000x");
w.println("#0.000x");
w.println("#0.000x");
w.println("#0.000x");
w.println("#0.000x");
w.println("#0.000x");
w.println("#0.000x");
w.println("#0.001x");
w.println("#0.001x");
w.println("#0.001x");
w.println("#0.001x");
w.println("#0.002x");
w.println("#0.002x");
w.println("#0.003x");
w.println("#0.003x");
w.println("#0.004x");
w.println("#0.005x");
w.println("#0.006x");
w.println("#0.007x");
w.println("#0.008x");
w.println("#0.009x");
w.println("#0.011x");
w.println("#0.012x");
w.println("#0.014x");
w.println("#0.016x");
w.println("#0.018x");
w.println("#0.020x");
w.println("#0.022x");
w.println("#0.024x");
w.println("#0.027x");
w.println("#0.030x");
w.println("#0.033x");
w.println("#0.036x");
w.println("#0.039x");
w.println("#0.043x");
w.println("#0.047x");
w.println("#0.051x");
w.println("#0.055x");
w.println("#0.059x");
w.println("#0.064x");
w.println("#0.069x");
w.println("#0.074x");
w.println("#0.080x");
w.println("#0.085x");
w.println("#0.091x");
w.println("#0.097x");
w.println("#0.104x");
w.println("#0.111x");
w.println("#0.118x");
w.println("#0.125x");
w.println("#0.133x");
w.println("#0.141x");
w.println("#0.149x");
w.println("#0.157x");
w.println("#0.166x");
w.println("#0.176x");
w.println("#0.185x");
w.println("#0.195x");
w.println("#0.205x");
w.println("#0.216x");
w.println("#0.227x");
w.println("#0.238x");
w.println("#0.250x");
w.println("#0.262x");
w.println("#0.275x");
w.println("#0.287x");
w.println("#0.301x");
w.println("#0.314x");
w.println("#0.329x");
w.println("#0.343x");
w.println("#0.358x");
w.println("#0.373x");
w.println("#0.389x");
w.println("#0.405x");
w.println("#0.422x");
w.println("#0.439x");
w.println("#0.457x");
w.println("#0.475x");
w.println("#0.493x");
w.println("#0.512x");
w.println("#0.531x");
w.println("#0.551x");
w.println("#0.572x");
w.println("#0.593x");
w.println("#0.614x");
w.println("#0.636x");
w.println("#0.659x");
w.println("#0.681x");
w.println("#0.705x");
w.println("#0.729x");
w.println("#0.754x");
w.println("#0.779x");
w.println("#0.804x");
w.println("#0.831x");
w.println("#0.857x");
w.println("#0.885x");
w.println("#0.913x");
w.println("#0.941x");
w.println("#0.970x");
w.println("#1.000x");
w.println();
}
finally
{
w.close();
}
}
/**
* Constructs a new RateAdjustor with the specified parameters. See the
* class-level javadoc for more information.
*
* @param barrier The barrier to update based on the specified
* rates.
* @param baseRatePerSecond The baseline rate per second, or 0 if none was
* specified.
* @param rates A list of rates and durations as described in
* the class-level javadoc. The reader will
* always be closed before this method returns.
*
* @throws IOException If there is a problem reading from
* the rates Reader.
* @throws IllegalArgumentException If there is a problem with the rates
* input.
*/
public RateAdjustor(@NotNull final FixedRateBarrier barrier,
final long baseRatePerSecond,
@NotNull final Reader rates)
throws IOException, IllegalArgumentException
{
// Read the header first.
final List lines;
try
{
Validator.ensureNotNull(barrier, rates);
setDaemon(true);
this.barrier = barrier;
lines = readLines(rates);
}
finally
{
rates.close();
}
final Map header = consumeHeader(lines);
final Set invalidKeys = new LinkedHashSet<>(header.keySet());
invalidKeys.removeAll(KEYS);
if (! invalidKeys.isEmpty())
{
throw new IllegalArgumentException(
ERR_RATE_ADJUSTOR_INVALID_KEYS.get(invalidKeys, KEYS));
}
final String format = header.get(FORMAT_KEY);
if (format == null)
{
throw new IllegalArgumentException(ERR_RATE_ADJUSTOR_MISSING_FORMAT.get(
FORMAT_KEY, FORMATS, COMMENT_START));
}
if (! format.equals(FORMAT_VALUE_RATE_DURATION))
{
// For now this is the only format that we support.
throw new IllegalArgumentException(
ERR_RATE_ADJUSTOR_INVALID_FORMAT.get(format, FORMAT_KEY, FORMATS));
}
repeat = Boolean.parseBoolean(header.get(REPEAT_KEY));
// This will be non-zero if it's set in the input.
long defaultDurationMillis = 0;
final String defaultDurationStr = header.get(DEFAULT_DURATION_KEY);
if (defaultDurationStr != null)
{
try
{
defaultDurationMillis = DurationArgument.parseDuration(
defaultDurationStr, TimeUnit.MILLISECONDS);
}
catch (final ArgumentException e)
{
Debug.debugException(e);
throw new IllegalArgumentException(
ERR_RATE_ADJUSTOR_INVALID_DEFAULT_DURATION.get(
defaultDurationStr, e.getExceptionMessage()),
e);
}
}
// Now parse out the rates and durations, which will look like this:
// 1000,1s
// 1.5,1d
// 0.5X, 1m
// # Duration can be omitted if default-duration header was included.
// 1000
final List> ratesAndDurationList =
new ArrayList<>(10);
final Pattern splitPattern = Pattern.compile("\\s*,\\s*");
for (final String fullLine: lines)
{
// Strip out comments and white space.
String line = fullLine;
final int commentStart = fullLine.indexOf(COMMENT_START);
if (commentStart >= 0)
{
line = line.substring(0, commentStart);
}
line = line.trim();
if (line.isEmpty())
{
continue;
}
final String[] fields = splitPattern.split(line);
if (!((fields.length == 2) ||
((fields.length == 1) && defaultDurationMillis != 0)))
{
throw new IllegalArgumentException(ERR_RATE_ADJUSTOR_INVALID_LINE.get(
fullLine, DEFAULT_DURATION_KEY));
}
String rateStr = fields[0];
boolean isRateMultiplier = false;
if (rateStr.endsWith("X") || rateStr.endsWith("x"))
{
rateStr = rateStr.substring(0, rateStr.length() - 1).trim();
isRateMultiplier = true;
}
double rate;
try
{
rate = Double.parseDouble(rateStr);
}
catch (final NumberFormatException e)
{
Debug.debugException(e);
throw new IllegalArgumentException(
ERR_RATE_ADJUSTOR_INVALID_RATE.get(rateStr, fullLine), e);
}
// Values that look like 2X are a multiplier on the base rate.
if (isRateMultiplier)
{
if (baseRatePerSecond <= 0)
{
throw new IllegalArgumentException(
ERR_RATE_ADJUSTOR_RELATIVE_RATE_WITHOUT_BASELINE.get(
rateStr, fullLine));
}
rate *= baseRatePerSecond;
}
final long durationMillis;
if (fields.length < 2)
{
durationMillis = defaultDurationMillis;
}
else
{
final String duration = fields[1];
try
{
durationMillis = DurationArgument.parseDuration(
duration, TimeUnit.MILLISECONDS);
}
catch (final ArgumentException e)
{
Debug.debugException(e);
throw new IllegalArgumentException(
ERR_RATE_ADJUSTOR_INVALID_DURATION.get(duration, fullLine,
e.getExceptionMessage()),
e);
}
}
ratesAndDurationList.add(new ObjectPair<>(rate, durationMillis));
}
ratesAndDurations = Collections.unmodifiableList(ratesAndDurationList);
}
/**
* Starts this thread and waits for the initial rate to be set.
*/
@Override
public void start()
{
super.start();
// Wait until the initial rate is set. Assuming the caller starts this
// RateAdjustor before the FixedRateBarrier is used by other threads,
// this will guarantee that the initial rate is in place before the
// barrier is used.
try
{
initialRateSetLatch.await();
}
catch (final InterruptedException e)
{
Debug.debugException(e);
Thread.currentThread().interrupt();
}
}
/**
* Adjusts the rate in FixedRateBarrier as described in the rates.
*/
@Override
public void run()
{
try
{
if (ratesAndDurations.isEmpty())
{
return;
}
do
{
final List> ratesAndEndTimes =
new ArrayList<>(ratesAndDurations.size());
long endTime = System.currentTimeMillis();
for (final ObjectPair rateAndDuration : ratesAndDurations)
{
endTime += rateAndDuration.getSecond();
ratesAndEndTimes.add(new ObjectPair<>(rateAndDuration.getFirst(),
endTime));
}
for (final ObjectPair rateAndEndTime: ratesAndEndTimes)
{
if (shutDown)
{
return;
}
final double rate = rateAndEndTime.getFirst();
final long intervalMillis = barrier.getTargetRate().getFirst();
final int perInterval = calculatePerInterval(intervalMillis, rate);
barrier.setRate(intervalMillis, perInterval);
// Signal start() that we've set the initial rate.
if (initialRateSetLatch.getCount() > 0)
{
initialRateSetLatch.countDown();
}
// Hold at this rate for the specified duration.
final long durationMillis =
rateAndEndTime.getSecond() - System.currentTimeMillis();
if (durationMillis > 0L)
{
sleeper.sleep(durationMillis);
}
}
}
while (repeat);
}
finally
{
// Just in case we happened to be shutdown before we were started.
// We still want start() to be able to return.
if (initialRateSetLatch.getCount() > 0)
{
initialRateSetLatch.countDown();
}
}
}
/**
* Signals this to shut down.
*/
public void shutDown()
{
shutDown = true;
sleeper.wakeup();
}
/**
* Returns the of rates and durations. This is primarily here for testing
* purposes.
*
* @return The list of rates and durations.
*/
@NotNull()
List> getRatesAndDurations()
{
return ratesAndDurations;
}
/**
* Calculates the rate per interval given the specified interval width
* and the target rate per second. (This is static and non-private so that
* it can be unit tested.)
*
* @param intervalDurationMillis The duration of the interval in
* milliseconds.
* @param ratePerSecond The target rate per second.
*
* @return The rate per interval, which will be at least 1.
*/
static int calculatePerInterval(final long intervalDurationMillis,
final double ratePerSecond)
{
final double intervalDurationSeconds = intervalDurationMillis / 1000.0;
final double ratePerInterval = ratePerSecond * intervalDurationSeconds;
return (int)Math.max(1, Math.round(ratePerInterval));
}
/**
* This reads the header at the start of the file. All blank lines and
* comment lines will be ignored. The end of the header will be signified by
* a line containing only the text "END HEADER". All non-blank, non-comment
* lines in the header must be in the format "name=value", where there may be
* zero or more spaces on either side of the equal sign, the name must not
* contain either the space or the equal sign character, and the value must
* not begin or end with a space. Header lines must not contain partial-line
* comments.
*
* @param lines The lines of input that include the header.
*
* @return A map of key/value pairs extracted from the header.
*
* @throws IllegalArgumentException If a problem is encountered while
* parsing the header (e.g., a malformed
* header line is encountered, multiple
* headers have the same key, there is no
* end of header marker, etc.).
*/
@NotNull()
static Map consumeHeader(@NotNull final List lines)
throws IllegalArgumentException
{
// The header will look like this:
// key1=value1
// key2 = value2
// END HEADER
boolean endHeaderFound = false;
final Map headerMap = new
LinkedHashMap<>(StaticUtils.computeMapCapacity(3));
final Iterator lineIter = lines.iterator();
while (lineIter.hasNext())
{
final String line = lineIter.next().trim();
lineIter.remove();
if (line.isEmpty() || line.startsWith(String.valueOf(COMMENT_START)))
{
continue;
}
if (line.equalsIgnoreCase(END_HEADER_TEXT))
{
endHeaderFound = true;
break;
}
final int equalPos = line.indexOf('=');
if (equalPos < 0)
{
throw new IllegalArgumentException(
ERR_RATE_ADJUSTOR_HEADER_NO_EQUAL.get(line));
}
final String key = line.substring(0, equalPos).trim();
if (key.isEmpty())
{
throw new IllegalArgumentException(
ERR_RATE_ADJUSTOR_HEADER_EMPTY_KEY.get(line));
}
final String newValue = line.substring(equalPos+1).trim();
final String existingValue = headerMap.get(key);
if (existingValue != null)
{
throw new IllegalArgumentException(
ERR_RATE_ADJUSTOR_DUPLICATE_HEADER_KEY.get(key, existingValue,
newValue));
}
headerMap.put(key, newValue);
}
if (! endHeaderFound)
{
// This means we iterated across all lines without finding the end header
// marker.
throw new IllegalArgumentException(
ERR_RATE_ADJUSTOR_NO_END_HEADER_FOUND.get(END_HEADER_TEXT));
}
return headerMap;
}
/**
* Returns a list of the lines read from the specified Reader.
*
* @param reader The Reader to read from.
*
* @return A list of the lines read from the specified Reader.
*
* @throws IOException If there is a problem reading from the Reader.
*/
@NotNull()
private static List readLines(@NotNull final Reader reader)
throws IOException
{
final BufferedReader bufferedReader = new BufferedReader(reader);
// We remove items from the front of the list, so a linked list works best.
final List lines = new LinkedList<>();
String line;
while ((line = bufferedReader.readLine()) != null)
{
lines.add(line);
}
return lines;
}
}
