Final State Machine
Vyacheslav N. Boyko
parent
9a0e88bd40
commit
9fa1b6b6a5
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@ -0,0 +1,14 @@
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group 'ru.bvn13'
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version '1.0'
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apply plugin: 'java'
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sourceCompatibility = 1.8
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repositories {
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mavenCentral()
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}
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dependencies {
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testCompile group: 'junit', name: 'junit', version: '4.12'
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}
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#!/usr/bin/env sh
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##############################################################################
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##
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## Gradle start up script for UN*X
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##
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##############################################################################
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# Attempt to set APP_HOME
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# Resolve links: $0 may be a link
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PRG="$0"
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# Need this for relative symlinks.
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while [ -h "$PRG" ] ; do
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ls=`ls -ld "$PRG"`
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link=`expr "$ls" : '.*-> \(.*\)$'`
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if expr "$link" : '/.*' > /dev/null; then
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PRG="$link"
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else
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PRG=`dirname "$PRG"`"/$link"
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fi
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done
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SAVED="`pwd`"
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cd "`dirname \"$PRG\"`/" >/dev/null
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APP_HOME="`pwd -P`"
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cd "$SAVED" >/dev/null
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APP_NAME="Gradle"
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APP_BASE_NAME=`basename "$0"`
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# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
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DEFAULT_JVM_OPTS=""
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# Use the maximum available, or set MAX_FD != -1 to use that value.
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MAX_FD="maximum"
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warn () {
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echo "$*"
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}
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die () {
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echo
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echo "$*"
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echo
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exit 1
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}
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# OS specific support (must be 'true' or 'false').
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cygwin=false
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msys=false
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darwin=false
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nonstop=false
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case "`uname`" in
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CYGWIN* )
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cygwin=true
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;;
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Darwin* )
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darwin=true
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;;
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MINGW* )
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msys=true
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;;
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NONSTOP* )
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nonstop=true
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;;
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esac
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CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
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# Determine the Java command to use to start the JVM.
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if [ -n "$JAVA_HOME" ] ; then
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if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
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# IBM's JDK on AIX uses strange locations for the executables
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JAVACMD="$JAVA_HOME/jre/sh/java"
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else
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JAVACMD="$JAVA_HOME/bin/java"
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fi
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if [ ! -x "$JAVACMD" ] ; then
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die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
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Please set the JAVA_HOME variable in your environment to match the
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location of your Java installation."
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fi
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else
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JAVACMD="java"
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which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
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Please set the JAVA_HOME variable in your environment to match the
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location of your Java installation."
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fi
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# Increase the maximum file descriptors if we can.
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if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
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MAX_FD_LIMIT=`ulimit -H -n`
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if [ $? -eq 0 ] ; then
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if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
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MAX_FD="$MAX_FD_LIMIT"
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fi
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ulimit -n $MAX_FD
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if [ $? -ne 0 ] ; then
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warn "Could not set maximum file descriptor limit: $MAX_FD"
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fi
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else
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warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
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fi
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fi
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# For Darwin, add options to specify how the application appears in the dock
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if $darwin; then
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GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
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fi
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# For Cygwin, switch paths to Windows format before running java
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if $cygwin ; then
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APP_HOME=`cygpath --path --mixed "$APP_HOME"`
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CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
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JAVACMD=`cygpath --unix "$JAVACMD"`
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# We build the pattern for arguments to be converted via cygpath
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ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
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SEP=""
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for dir in $ROOTDIRSRAW ; do
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ROOTDIRS="$ROOTDIRS$SEP$dir"
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SEP="|"
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done
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OURCYGPATTERN="(^($ROOTDIRS))"
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# Add a user-defined pattern to the cygpath arguments
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if [ "$GRADLE_CYGPATTERN" != "" ] ; then
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OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
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fi
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# Now convert the arguments - kludge to limit ourselves to /bin/sh
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i=0
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for arg in "$@" ; do
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CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
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CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
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if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
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eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
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else
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eval `echo args$i`="\"$arg\""
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fi
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i=$((i+1))
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done
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case $i in
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(0) set -- ;;
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(1) set -- "$args0" ;;
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(2) set -- "$args0" "$args1" ;;
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(3) set -- "$args0" "$args1" "$args2" ;;
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(4) set -- "$args0" "$args1" "$args2" "$args3" ;;
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(5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
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(6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
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(7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
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(8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
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(9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
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esac
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fi
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# Escape application args
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save () {
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for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
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echo " "
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}
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APP_ARGS=$(save "$@")
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# Collect all arguments for the java command, following the shell quoting and substitution rules
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eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
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# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
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if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
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cd "$(dirname "$0")"
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fi
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exec "$JAVACMD" "$@"
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@ -0,0 +1,84 @@
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@if "%DEBUG%" == "" @echo off
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@rem ##########################################################################
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@rem
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@rem Gradle startup script for Windows
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@rem
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@rem ##########################################################################
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@rem Set local scope for the variables with windows NT shell
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if "%OS%"=="Windows_NT" setlocal
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set DIRNAME=%~dp0
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if "%DIRNAME%" == "" set DIRNAME=.
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set APP_BASE_NAME=%~n0
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set APP_HOME=%DIRNAME%
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@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
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set DEFAULT_JVM_OPTS=
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@rem Find java.exe
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if defined JAVA_HOME goto findJavaFromJavaHome
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set JAVA_EXE=java.exe
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%JAVA_EXE% -version >NUL 2>&1
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if "%ERRORLEVEL%" == "0" goto init
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echo.
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echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
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echo.
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echo Please set the JAVA_HOME variable in your environment to match the
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echo location of your Java installation.
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goto fail
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:findJavaFromJavaHome
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set JAVA_HOME=%JAVA_HOME:"=%
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set JAVA_EXE=%JAVA_HOME%/bin/java.exe
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if exist "%JAVA_EXE%" goto init
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echo.
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echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
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echo.
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echo Please set the JAVA_HOME variable in your environment to match the
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echo location of your Java installation.
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goto fail
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:init
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@rem Get command-line arguments, handling Windows variants
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if not "%OS%" == "Windows_NT" goto win9xME_args
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:win9xME_args
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@rem Slurp the command line arguments.
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set CMD_LINE_ARGS=
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set _SKIP=2
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:win9xME_args_slurp
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if "x%~1" == "x" goto execute
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set CMD_LINE_ARGS=%*
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:execute
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@rem Setup the command line
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set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
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@rem Execute Gradle
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"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
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:end
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@rem End local scope for the variables with windows NT shell
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if "%ERRORLEVEL%"=="0" goto mainEnd
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:fail
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rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
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rem the _cmd.exe /c_ return code!
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if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
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exit /b 1
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:mainEnd
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if "%OS%"=="Windows_NT" endlocal
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:omega
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@ -0,0 +1,2 @@
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rootProject.name = 'FinalStateMachine'
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package ru.bvn13.fsm;
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/**
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* Created by bvn13 on 28.12.2017.
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*/
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public class Condition implements ConditionBehaviour {
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private FSM fsm;
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protected void setFSM(FSM fsm) {
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this.fsm = fsm;
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}
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@Override
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public boolean check() {
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return false;
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}
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}
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package ru.bvn13.fsm;
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/**
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* Created by bvn13 on 28.12.2017.
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*/
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public interface ConditionBehaviour {
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boolean check();
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}
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package ru.bvn13.fsm.Exceptions;
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import java.util.List;
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/**
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* Created by bvn13 on 28.12.2017.
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*/
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public class AmbiguousTransitionException extends FSMException {
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public AmbiguousTransitionException(String message) {
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super(message);
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}
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public AmbiguousTransitionException(String from, List<String> next) {
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super("");
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String msg = "";
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for (String to : next) {
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msg += (msg.length() > 0 ? ", " : "") + to;
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}
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this.message = String.format("Ambiguous transition from state %s. Candidates are: %s", from, msg);
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}
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}
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package ru.bvn13.fsm.Exceptions;
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/**
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* Created by bvn13 on 28.12.2017.
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*/
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public class BrokenTransitionException extends FSMException {
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public BrokenTransitionException(String from) {
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super("Broken transition from: "+from);
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}
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}
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package ru.bvn13.fsm.Exceptions;
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/**
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* Created by bvn13 on 28.12.2017.
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*/
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public class ConditionExistsException extends FSMException {
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public ConditionExistsException(String from, String to) {
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super(String.format("Condition exists: %s -> %s", from, to));
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}
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}
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package ru.bvn13.fsm.Exceptions;
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import java.io.PrintWriter;
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import java.io.StringWriter;
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/**
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* Created by bvn13 on 28.12.2017.
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*/
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public class FSMException extends Exception {
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protected String message;
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public FSMException(String message) {
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this.message = message;
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}
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protected String getStackTraceString() {
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StringWriter sw = new StringWriter();
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PrintWriter pw = new PrintWriter(sw);
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this.printStackTrace(pw);
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return sw.toString();
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}
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public void printStackTrace() {
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System.out.println(String.format("FSMException: %s / %s", message, getStackTraceString()));
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}
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}
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package ru.bvn13.fsm.Exceptions;
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/**
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* Created by bvn13 on 28.12.2017.
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*/
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public class NotInitedException extends FSMException {
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public NotInitedException(String message) {
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super(message);
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}
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public NotInitedException() {
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super("FSM is not inited");
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}
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}
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package ru.bvn13.fsm.Exceptions;
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/**
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* Created by bvn13 on 28.12.2017.
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*/
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public class StateExistsException extends FSMException {
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public StateExistsException(String stateName) {
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super(String.format("State exist: %s", stateName));
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}
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}
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package ru.bvn13.fsm.Exceptions;
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/**
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* Created by bvn13 on 28.12.2017.
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*/
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public class TransitionMissedException extends FSMException {
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public TransitionMissedException(String from) {
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super(String.format("Missed conditions from: %s", from));
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}
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}
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package ru.bvn13.fsm;
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import ru.bvn13.fsm.Exceptions.*;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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/**
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* Created by bvn13 on 28.12.2017.
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*/
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public class FSM {
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private boolean done = false;
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private State initialState;
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private State currentState;
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private Map<String, State> states;
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private Map<String, Map<String, ConditionBehaviour>> transitions;
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public FSM() {
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this.states = new HashMap<>();
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this.transitions = new HashMap<>();
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}
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private void checkStateExist(String name) throws StateExistsException {
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if (this.states.containsKey(name)) {
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throw new StateExistsException(name);
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}
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}
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public void init() throws NotInitedException {
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currentState = initialState;
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if (currentState == null) {
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throw new NotInitedException();
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}
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done = false;
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currentState.beforeEvent();
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currentState.process();
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}
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public State getCurrentState() {
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return currentState;
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}
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public void next() throws FSMException {
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if (done) {
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return;
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}
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currentState.afterEvent();
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if (currentState.isFinish()) {
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done = true;
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return;
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}
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if (!transitions.containsKey(currentState.getName())) {
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throw new TransitionMissedException(currentState.getName());
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}
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Map<String, ConditionBehaviour> conditions = transitions.get(currentState.getName());
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List<String> nextStates = new ArrayList<>();
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for (String key : conditions.keySet()) {
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if (conditions.get(key) == null) {
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nextStates.add(key);
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} else if(conditions.get(key).check()) {
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nextStates.add(key);
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}
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}
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if (nextStates.size() > 1) {
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throw new AmbiguousTransitionException(currentState.getName(), nextStates);
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}
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if (nextStates.size() == 0) {
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throw new BrokenTransitionException(currentState.getName());
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}
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State nextState = states.get(nextStates.get(0));
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nextState(nextState);
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}
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private void nextState(State state) {
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state.beforeEvent();
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currentState = state;
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currentState.process();
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}
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public void initState(State state) throws FSMException {
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state.setFSM(this);
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addState(state);
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initialState = state;
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}
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public void addState(State state) throws FSMException {
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checkStateExist(state.getName());
|
||||
this.states.put(state.getName(), state);
|
||||
}
|
||||
|
||||
public void addTransition(String fromState, String toState) throws FSMException {
|
||||
storeTransition(fromState, toState, null);
|
||||
}
|
||||
|
||||
public void addTransition(String fromState, String toState, Condition condition) throws FSMException {
|
||||
condition.setFSM(this);
|
||||
storeTransition(fromState, toState, condition);
|
||||
}
|
||||
|
||||
public void addTransition(String fromState, State toState) throws FSMException {
|
||||
addState(toState);
|
||||
addTransition(fromState, toState.getName());
|
||||
}
|
||||
|
||||
public void addTransition(String fromState, State toState, Condition condition) throws FSMException {
|
||||
addState(toState);
|
||||
addTransition(fromState, toState.getName(), condition);
|
||||
}
|
||||
|
||||
private void storeTransition(String fromState, String toState, Condition condition) throws FSMException {
|
||||
if (!transitions.containsKey(fromState)) {
|
||||
transitions.put(fromState, new HashMap<>());
|
||||
}
|
||||
if (transitions.get(fromState).containsKey(toState)) {
|
||||
throw new ConditionExistsException(fromState, toState);
|
||||
}
|
||||
transitions.get(fromState).put(toState, condition);
|
||||
}
|
||||
|
||||
}
|
||||
|
|
@ -0,0 +1,32 @@
|
|||
package ru.bvn13.fsm;
|
||||
|
||||
/**
|
||||
* Created by bvn13 on 28.12.2017.
|
||||
*/
|
||||
public class State implements StateBehaviour {
|
||||
|
||||
private String name;
|
||||
private boolean finish;
|
||||
|
||||
private FSM fsm;
|
||||
public void setFSM(FSM fsm) {
|
||||
this.fsm = fsm;
|
||||
}
|
||||
|
||||
public State(String name) {
|
||||
this.name = name;
|
||||
}
|
||||
public State(String name, boolean finish) {
|
||||
this.name = name;
|
||||
this.finish = finish;
|
||||
}
|
||||
|
||||
public String getName() {
|
||||
return this.name;
|
||||
}
|
||||
|
||||
public boolean isFinish() {
|
||||
return finish;
|
||||
}
|
||||
|
||||
}
|
||||
|
|
@ -0,0 +1,20 @@
|
|||
package ru.bvn13.fsm;
|
||||
|
||||
/**
|
||||
* Created by bvn13 on 28.12.2017.
|
||||
*/
|
||||
public interface StateBehaviour {
|
||||
|
||||
default void beforeEvent() {
|
||||
|
||||
}
|
||||
|
||||
default void afterEvent() {
|
||||
|
||||
}
|
||||
|
||||
default void process() {
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
|
@ -0,0 +1,108 @@
|
|||
package ru.bvn13.fsm.examples;
|
||||
|
||||
import ru.bvn13.fsm.Condition;
|
||||
import ru.bvn13.fsm.Exceptions.FSMException;
|
||||
import ru.bvn13.fsm.Exceptions.NotInitedException;
|
||||
import ru.bvn13.fsm.FSM;
|
||||
import ru.bvn13.fsm.State;
|
||||
|
||||
import java.io.BufferedReader;
|
||||
import java.io.IOException;
|
||||
import java.io.InputStreamReader;
|
||||
|
||||
/**
|
||||
* Created by bvn13 on 28.12.2017.
|
||||
*/
|
||||
public class Application {
|
||||
|
||||
public static class DialogFSM extends FSM {
|
||||
public String command;
|
||||
private BufferedReader br = null;
|
||||
|
||||
public void readCommand() {
|
||||
System.out.print("Command: ");
|
||||
br = new BufferedReader(new InputStreamReader(System.in));
|
||||
try {
|
||||
command = br.readLine();
|
||||
} catch (IOException e) {
|
||||
e.printStackTrace();
|
||||
System.exit(-1);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
public static void main(String argc[]) {
|
||||
|
||||
DialogFSM fsm = new DialogFSM();
|
||||
|
||||
try {
|
||||
fsm.initState(new State("greeting") {
|
||||
@Override
|
||||
public void beforeEvent() {
|
||||
System.out.println("Welcome!");
|
||||
}
|
||||
@Override
|
||||
public void process() {
|
||||
fsm.readCommand();
|
||||
try {
|
||||
fsm.next();
|
||||
} catch (FSMException e) {
|
||||
e.printStackTrace();
|
||||
System.exit(-1);
|
||||
}
|
||||
}
|
||||
@Override
|
||||
public void afterEvent() {
|
||||
System.out.println("Your command: "+fsm.command);
|
||||
}
|
||||
});
|
||||
} catch (FSMException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
|
||||
try {
|
||||
fsm.addTransition("greeting", new State("hello", true) {
|
||||
@Override
|
||||
public void beforeEvent() {
|
||||
System.out.println("Hello!");
|
||||
}
|
||||
@Override
|
||||
public void process() {
|
||||
|
||||
}
|
||||
@Override
|
||||
public void afterEvent() {
|
||||
System.out.println("DONE");
|
||||
}
|
||||
}, new Condition() {
|
||||
@Override
|
||||
public boolean check() {
|
||||
return fsm.command.equalsIgnoreCase("hello");
|
||||
}
|
||||
});
|
||||
} catch (FSMException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
|
||||
|
||||
try {
|
||||
fsm.addTransition("greeting", "greeting", new Condition() {
|
||||
@Override
|
||||
public boolean check() {
|
||||
return !fsm.command.equalsIgnoreCase("hello");
|
||||
}
|
||||
});
|
||||
} catch (FSMException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
|
||||
|
||||
try {
|
||||
fsm.init();
|
||||
} catch (NotInitedException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
|
@ -0,0 +1,87 @@
|
|||
package ru.bvn13.fsm.tests;
|
||||
|
||||
import org.junit.Assert;
|
||||
import org.junit.Test;
|
||||
import ru.bvn13.fsm.Exceptions.FSMException;
|
||||
import ru.bvn13.fsm.Exceptions.NotInitedException;
|
||||
import ru.bvn13.fsm.FSM;
|
||||
import ru.bvn13.fsm.State;
|
||||
|
||||
/**
|
||||
* Created by bvn13 on 28.12.2017.
|
||||
*/
|
||||
public class Tests {
|
||||
|
||||
public static class NamedFSM extends FSM {
|
||||
|
||||
public NamedFSM() {
|
||||
super();
|
||||
}
|
||||
|
||||
private String name;
|
||||
public NamedFSM setName(String name) {
|
||||
this.name = name;
|
||||
return this;
|
||||
}
|
||||
|
||||
public String toString() {
|
||||
return this.name;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
@Test
|
||||
public void creatingFSM() {
|
||||
|
||||
NamedFSM fsm = (new NamedFSM()).setName("TEST FSM");
|
||||
Assert.assertNotNull(fsm);
|
||||
|
||||
try {
|
||||
fsm.initState(new State("init") {
|
||||
@Override
|
||||
public void process() {
|
||||
System.out.println("" + fsm + " -> " + getName() + ": processed init");
|
||||
try {
|
||||
fsm.next();
|
||||
} catch (FSMException e) {
|
||||
e.printStackTrace();
|
||||
Assert.fail();
|
||||
}
|
||||
}
|
||||
});
|
||||
} catch (FSMException e) {
|
||||
e.printStackTrace();
|
||||
Assert.fail();
|
||||
}
|
||||
|
||||
try {
|
||||
fsm.addTransition("init", new State("first", true) {
|
||||
@Override
|
||||
public void process() {
|
||||
System.out.println("" + fsm + " -> " + getName() + ": processed first");
|
||||
try {
|
||||
fsm.next();
|
||||
} catch (FSMException e) {
|
||||
e.printStackTrace();
|
||||
Assert.fail();
|
||||
}
|
||||
}
|
||||
});
|
||||
} catch (FSMException e) {
|
||||
e.printStackTrace();
|
||||
Assert.fail();
|
||||
}
|
||||
|
||||
try {
|
||||
fsm.init();
|
||||
} catch (NotInitedException e) {
|
||||
e.printStackTrace();
|
||||
Assert.fail();
|
||||
}
|
||||
|
||||
Assert.assertTrue(fsm.getCurrentState().getName().equals("first"));
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue