Initial State Machine commit

This commit is contained in:
Maximilian Walz 2025-04-15 16:05:59 +02:00
commit 93aba73e97
16 changed files with 718 additions and 0 deletions

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/gradlew text eol=lf
*.bat text eol=crlf
*.jar binary

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HELP.md
.gradle
build/
!gradle/wrapper/gradle-wrapper.jar
!**/src/main/**/build/
!**/src/test/**/build/
### STS ###
.apt_generated
.classpath
.factorypath
.project
.settings
.springBeans
.sts4-cache
bin/
!**/src/main/**/bin/
!**/src/test/**/bin/
### IntelliJ IDEA ###
.idea
*.iws
*.iml
*.ipr
out/
!**/src/main/**/out/
!**/src/test/**/out/
### NetBeans ###
/nbproject/private/
/nbbuild/
/dist/
/nbdist/
/.nb-gradle/
### VS Code ###
.vscode/

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build.gradle Normal file
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plugins {
id 'java'
id 'org.springframework.boot' version '3.4.4'
id 'io.spring.dependency-management' version '1.1.7'
}
group = 'de.w665.pr'
version = '0.0.1-SNAPSHOT'
java {
toolchain {
languageVersion = JavaLanguageVersion.of(21)
}
}
configurations {
compileOnly {
extendsFrom annotationProcessor
}
}
repositories {
mavenCentral()
}
dependencies {
implementation 'org.springframework.boot:spring-boot-starter-web'
compileOnly 'org.projectlombok:lombok'
annotationProcessor 'org.projectlombok:lombok'
testImplementation 'org.springframework.boot:spring-boot-starter-test'
testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
// https://mvnrepository.com/artifact/org.springframework.statemachine/spring-statemachine-core
implementation 'org.springframework.statemachine:spring-statemachine-core:4.0.0'
}
tasks.named('test') {
useJUnitPlatform()
}

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distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
networkTimeout=10000
validateDistributionUrl=true
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists

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#!/bin/sh
#
# Copyright © 2015-2021 the original authors.
#
# 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
#
# https://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.
#
# SPDX-License-Identifier: Apache-2.0
#
##############################################################################
#
# Gradle start up script for POSIX generated by Gradle.
#
# Important for running:
#
# (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
# noncompliant, but you have some other compliant shell such as ksh or
# bash, then to run this script, type that shell name before the whole
# command line, like:
#
# ksh Gradle
#
# Busybox and similar reduced shells will NOT work, because this script
# requires all of these POSIX shell features:
# * functions;
# * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
# «${var#prefix}», «${var%suffix}», and «$( cmd )»;
# * compound commands having a testable exit status, especially «case»;
# * various built-in commands including «command», «set», and «ulimit».
#
# Important for patching:
#
# (2) This script targets any POSIX shell, so it avoids extensions provided
# by Bash, Ksh, etc; in particular arrays are avoided.
#
# The "traditional" practice of packing multiple parameters into a
# space-separated string is a well documented source of bugs and security
# problems, so this is (mostly) avoided, by progressively accumulating
# options in "$@", and eventually passing that to Java.
#
# Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
# and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
# see the in-line comments for details.
#
# There are tweaks for specific operating systems such as AIX, CygWin,
# Darwin, MinGW, and NonStop.
#
# (3) This script is generated from the Groovy template
# https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
# within the Gradle project.
#
# You can find Gradle at https://github.com/gradle/gradle/.
#
##############################################################################
# Attempt to set APP_HOME
# Resolve links: $0 may be a link
app_path=$0
# Need this for daisy-chained symlinks.
while
APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path
[ -h "$app_path" ]
do
ls=$( ls -ld "$app_path" )
link=${ls#*' -> '}
case $link in #(
/*) app_path=$link ;; #(
*) app_path=$APP_HOME$link ;;
esac
done
# This is normally unused
# shellcheck disable=SC2034
APP_BASE_NAME=${0##*/}
# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD=maximum
warn () {
echo "$*"
} >&2
die () {
echo
echo "$*"
echo
exit 1
} >&2
# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "$( uname )" in #(
CYGWIN* ) cygwin=true ;; #(
Darwin* ) darwin=true ;; #(
MSYS* | MINGW* ) msys=true ;; #(
NONSTOP* ) nonstop=true ;;
esac
CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
# IBM's JDK on AIX uses strange locations for the executables
JAVACMD=$JAVA_HOME/jre/sh/java
else
JAVACMD=$JAVA_HOME/bin/java
fi
if [ ! -x "$JAVACMD" ] ; then
die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
else
JAVACMD=java
if ! command -v java >/dev/null 2>&1
then
die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
fi
# Increase the maximum file descriptors if we can.
if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
case $MAX_FD in #(
max*)
# In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
# shellcheck disable=SC2039,SC3045
MAX_FD=$( ulimit -H -n ) ||
warn "Could not query maximum file descriptor limit"
esac
case $MAX_FD in #(
'' | soft) :;; #(
*)
# In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
# shellcheck disable=SC2039,SC3045
ulimit -n "$MAX_FD" ||
warn "Could not set maximum file descriptor limit to $MAX_FD"
esac
fi
# Collect all arguments for the java command, stacking in reverse order:
# * args from the command line
# * the main class name
# * -classpath
# * -D...appname settings
# * --module-path (only if needed)
# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
# For Cygwin or MSYS, switch paths to Windows format before running java
if "$cygwin" || "$msys" ; then
APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
JAVACMD=$( cygpath --unix "$JAVACMD" )
# Now convert the arguments - kludge to limit ourselves to /bin/sh
for arg do
if
case $arg in #(
-*) false ;; # don't mess with options #(
/?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath
[ -e "$t" ] ;; #(
*) false ;;
esac
then
arg=$( cygpath --path --ignore --mixed "$arg" )
fi
# Roll the args list around exactly as many times as the number of
# args, so each arg winds up back in the position where it started, but
# possibly modified.
#
# NB: a `for` loop captures its iteration list before it begins, so
# changing the positional parameters here affects neither the number of
# iterations, nor the values presented in `arg`.
shift # remove old arg
set -- "$@" "$arg" # push replacement arg
done
fi
# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
# Collect all arguments for the java command:
# * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
# and any embedded shellness will be escaped.
# * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
# treated as '${Hostname}' itself on the command line.
set -- \
"-Dorg.gradle.appname=$APP_BASE_NAME" \
-classpath "$CLASSPATH" \
org.gradle.wrapper.GradleWrapperMain \
"$@"
# Stop when "xargs" is not available.
if ! command -v xargs >/dev/null 2>&1
then
die "xargs is not available"
fi
# Use "xargs" to parse quoted args.
#
# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
#
# In Bash we could simply go:
#
# readarray ARGS < <( xargs -n1 <<<"$var" ) &&
# set -- "${ARGS[@]}" "$@"
#
# but POSIX shell has neither arrays nor command substitution, so instead we
# post-process each arg (as a line of input to sed) to backslash-escape any
# character that might be a shell metacharacter, then use eval to reverse
# that process (while maintaining the separation between arguments), and wrap
# the whole thing up as a single "set" statement.
#
# This will of course break if any of these variables contains a newline or
# an unmatched quote.
#
eval "set -- $(
printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
xargs -n1 |
sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
tr '\n' ' '
)" '"$@"'
exec "$JAVACMD" "$@"

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@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem https://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem
@rem SPDX-License-Identifier: Apache-2.0
@rem
@if "%DEBUG%"=="" @echo off
@rem ##########################################################################
@rem
@rem Gradle startup script for Windows
@rem
@rem ##########################################################################
@rem Set local scope for the variables with windows NT shell
if "%OS%"=="Windows_NT" setlocal
set DIRNAME=%~dp0
if "%DIRNAME%"=="" set DIRNAME=.
@rem This is normally unused
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%
@rem Resolve any "." and ".." in APP_HOME to make it shorter.
for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome
set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if %ERRORLEVEL% equ 0 goto execute
echo. 1>&2
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
echo. 1>&2
echo Please set the JAVA_HOME variable in your environment to match the 1>&2
echo location of your Java installation. 1>&2
goto fail
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
if exist "%JAVA_EXE%" goto execute
echo. 1>&2
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
echo. 1>&2
echo Please set the JAVA_HOME variable in your environment to match the 1>&2
echo location of your Java installation. 1>&2
goto fail
:execute
@rem Setup the command line
set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
:end
@rem End local scope for the variables with windows NT shell
if %ERRORLEVEL% equ 0 goto mainEnd
:fail
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
rem the _cmd.exe /c_ return code!
set EXIT_CODE=%ERRORLEVEL%
if %EXIT_CODE% equ 0 set EXIT_CODE=1
if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
exit /b %EXIT_CODE%
:mainEnd
if "%OS%"=="Windows_NT" endlocal
:omega

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# PowerShell script to send 100 GET requests to http://localhost/traffic/next using parallel execution
# This script uses runspaces for maximum performance
# Target URL
$url = "http://localhost/traffic/next"
# Number of requests to send
$requestCount = 1000
# Maximum number of concurrent threads
$maxThreads = 32 # Adjust based on your system's capabilities
Write-Host "Sending $requestCount GET requests to $url using parallel execution..."
# Create runspace pool
$runspacePool = [runspacefactory]::CreateRunspacePool(1, $maxThreads)
$runspacePool.Open()
# Create a script block for making the request
$scriptBlock = {
param($url, $id)
# Use Stopwatch for more precise timing
$stopwatch = [System.Diagnostics.Stopwatch]::StartNew()
try {
$response = Invoke-WebRequest -Uri $url -Method Get -UseBasicParsing -ErrorAction Stop
$stopwatch.Stop()
$timeMs = $stopwatch.Elapsed.TotalMilliseconds
# Return result object
[PSCustomObject]@{
RequestId = $id
StatusCode = $response.StatusCode
ResponseTimeMs = $timeMs
Success = $true
Error = $null
}
}
catch {
$stopwatch.Stop()
$timeMs = $stopwatch.Elapsed.TotalMilliseconds
# Return error object
[PSCustomObject]@{
RequestId = $id
StatusCode = 0
ResponseTimeMs = $timeMs
Success = $false
Error = $_.Exception.Message
}
}
}
# Measure total execution time
$totalStopwatch = [System.Diagnostics.Stopwatch]::StartNew()
# Create array for runspace jobs
$runspaces = @()
# Start all requests in parallel
for ($i = 1; $i -le $requestCount; $i++) {
$runspace = [powershell]::Create().AddScript($scriptBlock).AddArgument($url).AddArgument($i)
$runspace.RunspacePool = $runspacePool
$runspaces += [PSCustomObject]@{
Runspace = $runspace
Status = $runspace.BeginInvoke()
Id = $i
}
}
# Collect results
$results = @()
do {
# Check for completed runspaces
foreach ($runspace in ($runspaces | Where-Object { $_.Status.IsCompleted -eq $true })) {
$result = $runspace.Runspace.EndInvoke($runspace.Status)
$results += $result
# Remove from pending runspaces
$runspaces = $runspaces | Where-Object { $_.Id -ne $runspace.Id }
# Display result (optional)
if ($result.Success) {
Write-Host "Request $($result.RequestId) complete: $($result.ResponseTimeMs.ToString("0.00")) ms" -ForegroundColor Green
}
else {
Write-Host "Request $($result.RequestId) failed: $($result.Error)" -ForegroundColor Red
}
}
# Small sleep to prevent CPU thrashing
Start-Sleep -Milliseconds 10
} while ($runspaces.Count -gt 0)
# Stop timing
$totalStopwatch.Stop()
$totalTimeSeconds = $totalStopwatch.Elapsed.TotalSeconds
# Calculate statistics
$successResults = $results | Where-Object { $_.Success -eq $true }
$failureCount = ($results | Where-Object { $_.Success -eq $false }).Count
$successCount = $successResults.Count
if ($successCount -gt 0) {
$avgResponseTime = ($successResults | Measure-Object -Property ResponseTimeMs -Average).Average
$minResponseTime = ($successResults | Measure-Object -Property ResponseTimeMs -Minimum).Minimum
$maxResponseTime = ($successResults | Measure-Object -Property ResponseTimeMs -Maximum).Maximum
$requestsPerSecond = $requestCount / $totalTimeSeconds
}
# Display summary
Write-Host "`n--- Performance Summary ---"
Write-Host "Total Requests: $requestCount"
Write-Host "Successful: $successCount" -ForegroundColor Green
if ($failureCount -gt 0) {
Write-Host "Failed: $failureCount" -ForegroundColor Red
}
Write-Host "Total Time: $($totalTimeSeconds.ToString("0.00")) seconds"
Write-Host "Requests/second: $($requestsPerSecond.ToString("0.00"))"
if ($successCount -gt 0) {
Write-Host "`n--- Response Time (ms) ---"
Write-Host "Average: $($avgResponseTime.ToString("0.00")) ms"
Write-Host "Minimum: $($minResponseTime.ToString("0.00")) ms"
Write-Host "Maximum: $($maxResponseTime.ToString("0.00")) ms"
}
# Clean up resources
$runspacePool.Close()
$runspacePool.Dispose()

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rootProject.name = 'statemachine'

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package de.w665.pr.statemachine;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class StatemachineApplication {
public static void main(String[] args) {
SpringApplication.run(StatemachineApplication.class, args);
}
}

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package de.w665.pr.statemachine.trafficlight;
import jakarta.annotation.PostConstruct;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.statemachine.StateMachine;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/traffic")
public class TrafficLightController {
private int requestCount = 0;
@Autowired
private StateMachine<TrafficLightStates, TrafficLightEvents> stateMachine;
@PostConstruct
public void init() {
stateMachine.startReactively().subscribe();
}
@GetMapping("/state")
public String getCurrentState() {
requestCount++;
return stateMachine.getState().getId().toString() + " | Total requests: " + requestCount;
}
@GetMapping("/next")
public String triggerNextState() {
requestCount++;
stateMachine.sendEvent(TrafficLightEvents.TIMER);
return "Triggered TIMER event. New state: " + stateMachine.getState().getId() + " | Total requests: " + requestCount;
}
}

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package de.w665.pr.statemachine.trafficlight;
public enum TrafficLightEvents {
TIMER
}

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package de.w665.pr.statemachine.trafficlight;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.statemachine.action.Action;
import org.springframework.statemachine.config.EnableStateMachine;
import org.springframework.statemachine.config.StateMachineConfigurerAdapter;
import org.springframework.statemachine.config.builders.StateMachineStateConfigurer;
import org.springframework.statemachine.config.builders.StateMachineTransitionConfigurer;
import java.util.EnumSet;
@Slf4j
@Configuration
@EnableStateMachine
public class TrafficLightStateMachineConfig extends StateMachineConfigurerAdapter<TrafficLightStates, TrafficLightEvents> {
@Override
public void configure(StateMachineStateConfigurer<TrafficLightStates, TrafficLightEvents> states) throws Exception{
states
.withStates()
.initial(TrafficLightStates.RED)
.state(TrafficLightStates.RED, redEntryAction(), redExitAction())
.state(TrafficLightStates.YELLOW, yellowEntryAction(), yellowExitAction())
.state(TrafficLightStates.GREEN, greenEntryAction(), greenExitAction())
.states(EnumSet.allOf(TrafficLightStates.class)); // Do I need this line? Aren't all the states configured in the line above?
}
@Override
public void configure(StateMachineTransitionConfigurer<TrafficLightStates, TrafficLightEvents> transitions) throws Exception {
transitions
.withExternal()
.source(TrafficLightStates.RED)
.target(TrafficLightStates.GREEN)
.event(TrafficLightEvents.TIMER)
.and()
.withExternal()
.source(TrafficLightStates.GREEN)
.target(TrafficLightStates.YELLOW)
.event(TrafficLightEvents.TIMER)
.and()
.withExternal()
.source(TrafficLightStates.YELLOW)
.target(TrafficLightStates.RED)
.event(TrafficLightEvents.TIMER);
}
@Bean
public Action<TrafficLightStates, TrafficLightEvents> redEntryAction() {
return context -> log.info("Red light ON");
}
@Bean
Action<TrafficLightStates, TrafficLightEvents> redExitAction() {
return context -> log.info("Red light OFF");
}
@Bean
Action<TrafficLightStates, TrafficLightEvents> yellowEntryAction() {
return context -> log.info("Yellow light ON");
}
@Bean
Action<TrafficLightStates, TrafficLightEvents> yellowExitAction() {
return context -> log.info("Yellow light OFF");
}
@Bean
Action<TrafficLightStates, TrafficLightEvents> greenEntryAction() {
return context -> log.info("Green light ON");
}
@Bean
Action<TrafficLightStates, TrafficLightEvents> greenExitAction() {
return context -> log.info("Green light OFF");
}
}

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package de.w665.pr.statemachine.trafficlight;
public enum TrafficLightStates {
RED,
YELLOW,
GREEN
}

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spring.application.name=statemachine
server.port=80

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package de.w665.pr.statemachine;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
@SpringBootTest
class StatemachineApplicationTests {
@Test
void contextLoads() {
}
}