added solution for completionstage

This commit is contained in:
Sebastian Brosch 2024-10-24 18:30:42 +02:00
parent b0f40f726e
commit ff9ad018ff
Signed by: sebastianbrosch
GPG Key ID: 66E3143B54A6CF10
46 changed files with 445 additions and 0 deletions

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VL03-04-01/build.gradle Normal file
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apply plugin: 'java'
apply plugin: 'eclipse'
// Run 'gradlew eclipse' for the eclipse project
apply plugin: 'idea'
// Run 'gradle idea' for the IntelliJ idea project (no longer necessary in idea 13)
// Netbeans: See http://plugins.netbeans.org/plugin/44510/gradle-support
apply plugin:'application'
// Rung 'gradle run' to execute main program
mainClassName = "de.dhbw.parprog.DirSize"
repositories {
mavenCentral()
}
dependencies {
implementation 'commons-lang:commons-lang:2.6'
testImplementation 'junit:junit:4.11'
testImplementation 'org.easytesting:fest-assert:1.4'
}

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#Sun Mar 15 22:48:49 CET 2015
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip

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VL03-04-01/gradlew vendored Normal file
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#!/usr/bin/env bash
##############################################################################
##
## Gradle start up script for UN*X
##
##############################################################################
# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS=""
APP_NAME="Gradle"
APP_BASE_NAME=`basename "$0"`
# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD="maximum"
warn ( ) {
echo "$*"
}
die ( ) {
echo
echo "$*"
echo
exit 1
}
# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
case "`uname`" in
CYGWIN* )
cygwin=true
;;
Darwin* )
darwin=true
;;
MINGW* )
msys=true
;;
esac
# For Cygwin, ensure paths are in UNIX format before anything is touched.
if $cygwin ; then
[ -n "$JAVA_HOME" ] && JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
fi
# Attempt to set APP_HOME
# Resolve links: $0 may be a link
PRG="$0"
# Need this for relative symlinks.
while [ -h "$PRG" ] ; do
ls=`ls -ld "$PRG"`
link=`expr "$ls" : '.*-> \(.*\)$'`
if expr "$link" : '/.*' > /dev/null; then
PRG="$link"
else
PRG=`dirname "$PRG"`"/$link"
fi
done
SAVED="`pwd`"
cd "`dirname \"$PRG\"`/" >&-
APP_HOME="`pwd -P`"
cd "$SAVED" >&-
CLASSPATH=$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: $JAVA_HOME
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
else
JAVACMD="java"
which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
# Increase the maximum file descriptors if we can.
if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then
MAX_FD_LIMIT=`ulimit -H -n`
if [ $? -eq 0 ] ; then
if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
MAX_FD="$MAX_FD_LIMIT"
fi
ulimit -n $MAX_FD
if [ $? -ne 0 ] ; then
warn "Could not set maximum file descriptor limit: $MAX_FD"
fi
else
warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
fi
fi
# For Darwin, add options to specify how the application appears in the dock
if $darwin; then
GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
fi
# For Cygwin, switch paths to Windows format before running java
if $cygwin ; then
APP_HOME=`cygpath --path --mixed "$APP_HOME"`
CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
# We build the pattern for arguments to be converted via cygpath
ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
SEP=""
for dir in $ROOTDIRSRAW ; do
ROOTDIRS="$ROOTDIRS$SEP$dir"
SEP="|"
done
OURCYGPATTERN="(^($ROOTDIRS))"
# Add a user-defined pattern to the cygpath arguments
if [ "$GRADLE_CYGPATTERN" != "" ] ; then
OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
fi
# Now convert the arguments - kludge to limit ourselves to /bin/sh
i=0
for arg in "$@" ; do
CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
else
eval `echo args$i`="\"$arg\""
fi
i=$((i+1))
done
case $i in
(0) set -- ;;
(1) set -- "$args0" ;;
(2) set -- "$args0" "$args1" ;;
(3) set -- "$args0" "$args1" "$args2" ;;
(4) set -- "$args0" "$args1" "$args2" "$args3" ;;
(5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
(6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
(7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
(8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
(9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
esac
fi
# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
function splitJvmOpts() {
JVM_OPTS=("$@")
}
eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"

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@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
@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=
set DIRNAME=%~dp0
if "%DIRNAME%" == "" set DIRNAME=.
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%
@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome
set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if "%ERRORLEVEL%" == "0" goto init
echo.
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
if exist "%JAVA_EXE%" goto init
echo.
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:init
@rem Get command-line arguments, handling Windowz variants
if not "%OS%" == "Windows_NT" goto win9xME_args
if "%@eval[2+2]" == "4" goto 4NT_args
:win9xME_args
@rem Slurp the command line arguments.
set CMD_LINE_ARGS=
set _SKIP=2
:win9xME_args_slurp
if "x%~1" == "x" goto execute
set CMD_LINE_ARGS=%*
goto execute
:4NT_args
@rem Get arguments from the 4NT Shell from JP Software
set CMD_LINE_ARGS=%$
: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 %CMD_LINE_ARGS%
:end
@rem End local scope for the variables with windows NT shell
if "%ERRORLEVEL%"=="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!
if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
exit /b 1
:mainEnd
if "%OS%"=="Windows_NT" endlocal
:omega

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package de.dhbw.parprog;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Collectors;
/**
* Class to get the directory size and file count using Completion Stages.
*/
public class DirSize {
/**
* This is a helper method to convert a list of future to a future of list using
* the same type.
*
* @param <T> The type of list and future.
* @param futures The list of futures to be converted.
* @return The future of list.
*/
public static <T> CompletableFuture<List<T>> sequence(List<CompletableFuture<T>> futures) {
CompletableFuture<Void> allDoneFuture = CompletableFuture
.allOf(futures.toArray(new CompletableFuture[futures.size()]));
return allDoneFuture.thenApply(v -> futures.stream()
.map(future -> future.join())
.collect(Collectors.<T>toList()));
}
/**
* Method to get stats of a directory.
*
* @param dir The directory to get the stats of.
* @return A future with stats of the directory.
*/
public CompletableFuture<DirStats> dirStats(File dir) {
CompletableFuture<List<CompletableFuture<DirStats>>> folder = CompletableFuture.supplyAsync(() -> {
DirStats folderStats = new DirStats();
List<CompletableFuture<DirStats>> listDirStats = new ArrayList<>();
File[] contents = dir.listFiles();
if (contents != null) {
for (File file : contents) {
if (file.isDirectory()) {
if (!file.getName().equals(".")) {
listDirStats.add(dirStats(file));
}
} else {
folderStats.fileCount++;
folderStats.totalSize += file.length();
}
}
}
listDirStats.add(CompletableFuture.completedFuture(folderStats));
return listDirStats;
});
CompletableFuture<List<DirStats>> flattened = folder.thenCompose(future -> {
return sequence(future);
});
return flattened.thenApply(list -> {
DirStats sum = new DirStats();
for (DirStats stats : list) {
sum.fileCount += stats.fileCount;
sum.totalSize += stats.totalSize;
}
return sum;
});
}
public static void main(String[] args) throws Exception {
if (args.length < 1) {
System.out.println("Benötigter Parameter: Startverzeichnis");
System.exit(1);
}
File startDir = new File(args[0]);
if (!startDir.isDirectory()) {
System.out.println("Dies ist kein Verzeichnis!");
System.exit(1);
}
DirSize test = new DirSize();
DirStats result = test.dirStats(startDir).get();
System.out.println(result.fileCount + " Dateien, " + result.totalSize + " Bytes.");
}
}

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package de.dhbw.parprog;
/**
* Class representing stats for a directory.
*/
public class DirStats {
/**
* The count of files.
*/
int fileCount;
/**
* The total size of all files.
*/
long totalSize;
/**
* Creates a new instance for stats.
*/
public DirStats() {
fileCount = 0;
totalSize = 0;
}
/**
* Creates a new instance for stats with values.
* @param fileCount The count of files.
* @param totalSize The size of all files.
*/
public DirStats(int fileCount, long totalSize) {
this.fileCount = fileCount;
this.totalSize = totalSize;
}
/**
* Gets the string representation of the stats.
* @return The string with stats of directory.
*/
@Override
public String toString() {
return "DirStats(fileCount=" + fileCount + ", totalSize=" + totalSize + ")";
}
}

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package de.dhbw.parprog;
import static org.fest.assertions.Assertions.assertThat;
import java.io.File;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
@RunWith(JUnit4.class)
public class DirStatTests {
@Test
public void correctStatsInTestdir() throws Exception {
File testDir = new File("src/test/resources/testdir");
assertThat(testDir.isDirectory()).isTrue();
DirSize test = new DirSize();
DirStats stats = test.dirStats(testDir).get();
assertThat(stats.fileCount).isEqualTo(38);
assertThat(stats.totalSize).isEqualTo(3230);
}
}

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