sebastianbrosch/VL-PAR-PROG
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

solution for smart bank

Browse Source
This commit is contained in:
Sebastian Brosch 2024-10-12 23:38:53 +02:00
commit 5683751a99
Signed by: sebastianbrosch
GPG Key ID: 66E3143B54A6CF10
14 changed files with 603 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
.editorconfig Normal file
View File

@ -0,0 +1,9 @@
root = true
[*]
charset = utf-8
indent_style = space
[*.java]
indent_size = 2
insert_final_newline = true

3
.gitignore vendored Normal file
View File

@ -0,0 +1,3 @@
.vscode/
.gradle/
build/

1
README.md Normal file
View File

@ -0,0 +1 @@
# VL-PAR-PROG

22
VL03-02-01/build.gradle Normal file
View File

@ -0,0 +1,22 @@
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
repositories {
mavenCentral()
}
dependencies {
implementation 'commons-lang:commons-lang:2.6'
testImplementation 'junit:junit:4.11'
testImplementation 'org.easytesting:fest-assert:1.4'
}

BIN
VL03-02-01/gradle/wrapper/gradle-wrapper.jar vendored Normal file
View File

Binary file not shown.

6
VL03-02-01/gradle/wrapper/gradle-wrapper.properties vendored Normal file
View File

@ -0,0 +1,6 @@
#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

164
VL03-02-01/gradlew vendored Normal file
View File

@ -0,0 +1,164 @@
#!/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 "$@"

90
VL03-02-01/gradlew.bat vendored Normal file
View File

@ -0,0 +1,90 @@
@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

37
VL03-02-01/src/main/java/de/dhbw/parprog/Account.java Normal file
View File

@ -0,0 +1,37 @@
package de.dhbw.parprog;
/**
* Class which represents a bank account.
*/
public class Account {
/**
* The lower limit of the balance.
*/
public static final long LOWER_LIMIT = 0;
/**
* The upper limit of the balance.
*/
public static final long UPPER_LIMIT = 100000;
/**
* The balance of the bank account.
*/
public long balance = 0;
/**
* The bank account number.
*/
public long number = 0;
/**
* Constructor to create a new bank account.
* @param number The bank account number.
* @param balance The initial balance of the bank account.
*/
public Account(long number, long balance) {
this.balance = balance;
this.number = number;
}
}

117
VL03-02-01/src/main/java/de/dhbw/parprog/Bank.java Normal file
View File

@ -0,0 +1,117 @@
package de.dhbw.parprog;
/**
* Class which represents a bank.
*/
public class Bank {
/**
* The next bank account number which can be used for a new bank account.
* This number is used to get distinct bank account numbers.
*/
private static int number = 100000;
/**
* Creates a new bank account.
* @return A new bank account.
*/
public synchronized Account createAccount() {
return new Account(Bank.number++, 0);
}
/**
* Gets the current balance of a bank account.
* @param account The bank account to get the balance.
* @return The current balance of the bank account.
* @throws IllegalArgumentException
*/
public long getBalance(Account account) throws IllegalArgumentException {
if (account == null) {
throw new IllegalArgumentException();
} else {
return account.balance;
}
}
/**
* Deposits an amount into a bank account.
* @param account The bank account to deposit the amount into.
* @param amount The amount to deposit into the bank account.
* @throws IllegalArgumentException
* @throws IllegalAccountStateException
*/
public void deposit(Account account, long amount) throws IllegalAccountStateException, IllegalArgumentException {
if (account == null || amount < 0) {
throw new IllegalArgumentException();
}
if ((this.getBalance(account) + amount) > Account.UPPER_LIMIT) {
throw new IllegalAccountStateException();
} else {
account.balance += amount;
}
}
/**
* Withdraws an amount from a bank account.
* @param account The bank account to withdraw the amount from.
* @param amount The amount to withdraw from the bank account.
* @throws IllegalArgumentException
* @throws IllegalAccountStateException
*/
public void withdraw(Account account, long amount) throws IllegalAccountStateException, IllegalArgumentException {
if (account == null || amount < 0) {
throw new IllegalArgumentException();
}
if ((this.getBalance(account) - amount) < Account.LOWER_LIMIT) {
throw new IllegalAccountStateException();
} else {
account.balance -= amount;
}
}
/**
* Transfers a amount between two bank accounts.
* @param fromAccount The bank account to withdraw from.
* @param toAccount The bank account to deposit into.
* @param amount The amount to transfer between the two bank accounts.
* @throws IllegalArgumentException
* @throws IllegalAccountStateException
*/
public void transfer(Account fromAccount, Account toAccount, long amount) throws IllegalAccountStateException, IllegalArgumentException {
if (fromAccount == null || toAccount == null || amount < 0) {
throw new IllegalArgumentException();
}
Account a, b;
// it is important to lock the accounts always in the same order.
// the bank account number is used to sort the bank accounts.
if (fromAccount.number > toAccount.number) {
a = fromAccount;
b = toAccount;
} else {
a = toAccount;
b = fromAccount;
}
// lock the two bank accounts to transfer the amount between them.
// a different thread should not be able to do changes while the transfer is running.
synchronized(a) {
synchronized(b) {
if ((this.getBalance(fromAccount) - amount) < Account.LOWER_LIMIT) {
throw new IllegalAccountStateException();
}
if ((this.getBalance(toAccount) + amount) > Account.UPPER_LIMIT) {
throw new IllegalAccountStateException();
}
this.deposit(fromAccount, amount);
this.withdraw(toAccount, amount);
}
}
}
}

37
VL03-02-01/src/main/java/de/dhbw/parprog/Example.java Normal file
View File

@ -0,0 +1,37 @@
package de.dhbw.parprog;
/**
* Class which represents an example / demo.
*/
public class Example {
public static void main(String[] args) {
// initialize the bank and two bank accounts with initial balance.
Bank bank = new Bank();
Account a = bank.createAccount();
Account b = bank.createAccount();
bank.deposit(a, 10000);
bank.deposit(b, 10000);
// output the balance of the bank accounts before running some transfers.
System.out.println("Account A=" + a.number + ", Account B=" + b.number);
System.out.println("Start Balance: A=" + bank.getBalance(a) + ", B=" + bank.getBalance(b));
// create and start two threads transfering an amount between the two bank accounts.
Thread t1 = new Thread(new Transfer(bank, a, b, 10, 1000));
Thread t2 = new Thread(new Transfer(bank, b, a, 10, 1000));
t1.start();
t2.start();
// wait until the threads are finished.
try {
t1.join();
t2.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
// output the balance of the bank accounts after finishing the transfers.
System.out.println("End Balance: A=" + bank.getBalance(a) + ", B=" + bank.getBalance(b));
}
}

5
VL03-02-01/src/main/java/de/dhbw/parprog/IllegalAccountStateException.java Normal file
View File

@ -0,0 +1,5 @@
package de.dhbw.parprog;
public class IllegalAccountStateException extends RuntimeException {
}

57
VL03-02-01/src/main/java/de/dhbw/parprog/Transfer.java Normal file
View File

@ -0,0 +1,57 @@
package de.dhbw.parprog;
/**
* Class which represents a transfer between two bank accounts.
*/
public class Transfer implements Runnable {
/**
* The bank of the two bank accounts.
*/
Bank bank;
/**
* The bank account to transfer from.
*/
Account fromAccount;
/**
* The bank account to transfer into.
*/
Account toAccount;
/**
* The amount to transfer between the two bank accounts.
*/
long amount;
/**
* The number of transfers between the two bank accounts.
*/
int count;
/**
* Constructor to create a new transfer between two bank accounts.
* @param bank The bank of the bank accounts.
* @param fromAccount The bank account to transfer from.
* @param toAccount The bank account to transfer into.
* @param amount The amount to transfer between the two bank accounts.
* @param count The number of transfers between the two bank acocunts.
*/
Transfer(Bank bank, Account fromAccount, Account toAccount, long amount, int count) {
this.bank = bank;
this.fromAccount = fromAccount;
this.toAccount = toAccount;
this.amount = amount;
this.count = count;
}
/**
* The method to do the multiple transfers with a given amount.
*/
public void run() {
for (int i = 0; i < this.count; i++) {
this.bank.transfer(this.fromAccount, this.toAccount, this.amount);
}
}
}

55
VL03-02-01/src/test/java/de/dhbw/parprog/AccountStateTests.java Normal file
View File

@ -0,0 +1,55 @@
package de.dhbw.parprog;
import static org.fest.assertions.Assertions.assertThat;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
@RunWith(JUnit4.class)
public class AccountStateTests {
Bank bank;
@Rule
public ExpectedException thrown = ExpectedException.none();
@Before
public void setupTest() {
bank = new Bank();
}
@Test
public void newAccountHasNoCredits() {
Account a = bank.createAccount();
assertThat(bank.getBalance(a)).isEqualTo(0);
}
@Test
public void canDepositAndWithdraw() throws IllegalAccountStateException {
Account a = bank.createAccount();
bank.deposit(a, 10);
bank.withdraw(a, 5);
}
@Test
public void cantDepositMoreThanMaximum() throws IllegalAccountStateException {
Account a = bank.createAccount();
bank.deposit(a, Account.UPPER_LIMIT);
thrown.expect(IllegalAccountStateException.class);
bank.deposit(a, 1);
Assert.fail("Should have caused an exception");
}
@Test
public void cantWithdrawBelowMinimum() throws IllegalAccountStateException {
Account a = bank.createAccount();
thrown.expect(IllegalAccountStateException.class);
bank.withdraw(a, 1);
Assert.fail("Should have caused an exception");
}
}