Add ThreadPool

.gitignore

@@ -30,3 +30,4 @@ bin/
 
 /gradle/
 /.gradle/
+/build/

.idea/gradle.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>

.idea/misc.xml

@@ -1,4 +1,3 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
   <component name="FrameworkDetectionExcludesConfiguration">

src/main/java/Main.java

@@ -0,0 +1,42 @@
+import de.dhbw.parprog.JavaPipe;
+import smartBank.TransferSpam;
+
+import java.io.IOException;
+
+public class Main {
+    public static void main(String[] args) throws IOException {
+        JavaPipe.PipeMain();
+        //TransferSpam.main();
+    }
+}
+
+class RecursiveMath{
+    public static int add(int a, int b){
+        if(b < 1){
+            return a;
+        }
+        return add(a+1, b-1);
+    }
+
+    public static int multiply(int a, int b) {
+        if (b < 0) {
+            return -multiply(a, -b);
+        } else if (b == 0) {
+            return 0;
+        } else {
+            return add(a, multiply(a, b - 1));
+        }
+    }
+
+    public static int expo(int a, int b){
+        if (b==0){
+            return 1;
+        }else if (b == 1) {
+            return a;
+        }
+        return multiply(a, expo(a, b-1));
+    }
+    public static void main(String[] args) {
+        System.out.println(expo(2,6));
+    }
+}

src/main/java/Threadpool/ThreadPool.java

@@ -0,0 +1,42 @@
+package Threadpool;
+
+import java.util.Vector;
+import java.util.concurrent.*;
+import static java.util.concurrent.Executors.newFixedThreadPool;
+
+public class ThreadPool {
+    private class Calculation implements Callable{
+        @Override
+        public Object call() throws Exception {
+            Thread.sleep(1000);
+            return 42;
+        }
+    }
+    public int doCalculation() throws ExecutionException, InterruptedException {
+        int totalResult = 0;
+        int threadPoolSize = 5;
+        int numberOfCalculations = 10;
+
+        Vector<Future<Integer>> allResults = new Vector<>();
+        ExecutorService threadpool = newFixedThreadPool(threadPoolSize);
+
+        for (int i = 0; i < numberOfCalculations; i++) {
+            Future<Integer> oneResult = threadpool.submit(new Calculation());
+            allResults.add(oneResult);
+        }
+
+        for (Future<Integer> result : allResults) {
+            totalResult += result.get();
+        }
+
+        threadpool.shutdown();
+        return totalResult;
+    }
+
+    public static void main(String[] args) throws ExecutionException, InterruptedException {
+        ThreadPool test = new ThreadPool();
+        System.out.println("Calculation started");
+        int result = test.doCalculation();
+        System.out.println("Result: " + result);
+    }
+}

src/main/java/de/dhbw/parprog/JavaPipe.java

@@ -2,15 +2,10 @@ package de.dhbw.parprog;
 
 import de.dhbw.parprog.processemu.Pipe;
 import de.dhbw.parprog.processemu.ProcessEmu;
-import org.apache.commons.lang.NotImplementedException;
 
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
-import java.nio.file.AccessMode;
-import java.sql.SQLOutput;
-import java.util.List;
-import java.util.Vector;
 
 
 public class JavaPipe {
@@ -19,7 +14,7 @@ public class JavaPipe {
        BufferedReader in = new BufferedReader(new InputStreamReader(inputstream));
      */
 
-    public static void main(String[] args) throws IOException {
+    public static void PipeMain() throws IOException {
         int Amount = 42;
         int[] allResults = new int[Amount];
         Pipe[] pipes = new Pipe[Amount];
@@ -36,11 +31,16 @@ public class JavaPipe {
         System.out.println("sup nerd");
 
         int sum = 0;
-        for(int i = 0; i<allResults.length; i++){
-            sum += allResults[i];
-            System.out.println("Got a return of " + allResults[i]);
+        for (int Result : allResults) {
+            sum += Result;
+            System.out.println("Got a return of " + Result);
         }
 
         System.out.println("The sum is " + sum);
+
+/*
+        BufferedReader reader = new BufferedReader(new InputStreamReader(pipes[0].getIn()));
+        String result = reader.readLine();
+  */
     }
 }

src/main/java/smartBank/Account.java

@@ -0,0 +1,72 @@
+package smartBank;
+
+
+public class Account {
+    public static long LOWER_LIMIT = 0;
+    public static long UPPER_LIMIT = 100000;
+
+    private long balance;
+    private final long accountNumber;
+
+    public Account(long AccountNumber){
+        this(AccountNumber, 0);
+    }
+    public Account(long Accountnumber, long initialBalance){
+        this.balance = initialBalance;
+        this.accountNumber = Accountnumber;
+    }
+
+
+    public long getBalance() {
+        return balance;
+    }
+
+    public void setBalance(long balance) {
+        if (balance < LOWER_LIMIT){
+            throw new IllegalAccountStateException();
+        }
+        if (balance > UPPER_LIMIT){
+            throw new IllegalAccountStateException();
+        }
+
+        this.balance = balance;
+    }
+
+    public void withdraw(long amount) throws IllegalAccountStateException{
+        if (amount > this.balance){
+            throw new IllegalAccountStateException();
+        }
+
+        this.setBalance( (this.getBalance() - amount) );
+    }
+
+    public void deposit(long amount) throws IllegalAccountStateException{
+        if((this.getBalance()+amount) > UPPER_LIMIT){
+            throw new IllegalAccountStateException();
+        }
+
+        this.setBalance( (this.getBalance()+amount) );
+    }
+
+    public static Account getLowerIdAccount(Account a1, Account a2){
+        if ((a1 != a2) && (a1.accountNumber == a2.accountNumber)){
+            throw new RuntimeException("2 Accounts with Same ID");
+        }
+        if (a1 == a2){
+            throw new IllegalArgumentException();
+        }
+
+        if (a1.accountNumber < a2.accountNumber){
+            return a1;
+        }
+        return a2;
+    }
+
+    public static Account getHigherIdAccount(Account a1, Account a2){
+        if (getLowerIdAccount(a1, a2) == a1){
+            return a2;
+        }else {
+            return a1;
+        }
+    }
+}

src/main/java/smartBank/Bank.java

@@ -0,0 +1,82 @@
+package smartBank;
+
+import java.util.Vector;
+
+
+public class Bank {
+    static long AccountsInUse = 0;
+    public Vector<Account> allAccounts = new Vector<Account>();
+
+    /**
+     * Erzeugt ein neues Konto mit initialem Kontostand 0.
+     * @return das neue Konto
+     */
+	public synchronized Account createAccount() {
+        Account newAccount = new Account(AccountsInUse++);
+        allAccounts.add(newAccount);
+        return newAccount;
+    }
+
+    public void setAllBalances(long value){
+        for (Account account : this.allAccounts) {
+            account.setBalance(value);
+        }
+    }
+
+    /**
+     * Ruft den aktuellen Kontostand ab
+     * @param account Konto, dessen Kontostand bestimmt werden soll
+     * @return der aktuelle Kontostand
+     * @throws IllegalArgumentException bei ungültigen Parametern
+     */
+	public long getBalance(Account account) throws IllegalArgumentException {
+        return account.getBalance();
+    }
+
+    /**
+     * Einzahlen eines bestimmten Betrags
+     * @param account das Konto, auf den der Betrag eingezahlt werden soll
+     * @param amount der Betrag (muß >=0 sein)
+     * @throws IllegalArgumentException bei ungültigen Parametern
+     * @throws IllegalAccountStateException falls der Kontostand außerhalb des gültigen Wertebereichs geraten würde
+     */
+	public void deposit(Account account, long amount) throws IllegalAccountStateException, IllegalArgumentException {
+        account.deposit(amount);
+    }
+
+    /**
+     * Abheben eines bestimmten Betrags
+     * @param account das Konto, von dem der Betrag abgehoben werden soll
+     * @param amount der Betrag (muß >=0 sein)
+     * @throws IllegalArgumentException bei ungültigen Parametern
+     * @throws IllegalAccountStateException falls der Kontostand außerhalb des gültigen Wertebereichs geraten würde
+     */
+	public void withdraw(Account account, long amount) throws IllegalAccountStateException, IllegalArgumentException {
+        account.withdraw(amount);
+    }
+
+    /**
+     * Überweisen eines Betrags von einem Konto auf ein anderes
+     * @param fromAccount Konto, von dem abgebucht werden soll
+     * @param toAccount Konto, auf das gutgeschrieben werden soll
+     * @param amount der zu transferierende Betrag (muß >=0 sein)
+     * @throws IllegalArgumentException bei ungültigen Parametern
+     * @throws IllegalAccountStateException falls einer der Kontostände außerhalb des gültigen Wertebereichs geraten würde
+     */
+	public void transfer(Account fromAccount, Account toAccount, long amount) throws IllegalAccountStateException, IllegalArgumentException {
+        fromAccount.withdraw(amount);
+        toAccount.deposit(amount);
+
+    }
+
+    public String toString() {
+        String[] alphabet = {"A", "B", "C", "D", "E", "F", "G", "H"};
+        String result = "";
+
+        for (int i = 0; i < this.allAccounts.size(); i++) {
+            result += (alphabet[i] + " " + allAccounts.get(i).getBalance() + " ");
+        }
+
+        return result;
+    }
+}

src/main/java/smartBank/IllegalAccountStateException.java

@@ -0,0 +1,5 @@
+package smartBank;
+
+
+public class IllegalAccountStateException extends RuntimeException {
+}

src/main/java/smartBank/TransferSpam.java

@@ -0,0 +1,57 @@
+package smartBank;
+
+import java.util.Random;
+
+public class TransferSpam extends Thread{
+        Bank bank;
+        Account sender;
+        Account receiver;
+
+    public TransferSpam(Bank bank, Account sender, Account receiver){
+        this.bank = bank;
+        this.sender = sender;
+        this.receiver = receiver;
+    }
+
+    @Override
+    public void run() {
+        for (int i = 0; i < 25; i++) {
+            try {
+                Thread.sleep((int) (Math.random()*500));
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e);
+            }
+
+            synchronized (bank){ // To make Console prettier? very bad to sync the actual transactions
+            synchronized (Account.getLowerIdAccount(this.sender, this.receiver)) {
+                synchronized (Account.getHigherIdAccount(this.sender, this.receiver)) {
+                    bank.transfer(this.sender, this.receiver, 1);
+                    System.out.println(bank);
+                }
+            }
+            }
+        }
+    }
+
+    public static void main() {
+        Bank bank = new Bank();
+        bank.createAccount();
+        bank.createAccount();
+        bank.createAccount();
+        bank.createAccount();
+        bank.createAccount();
+        bank.setAllBalances(1000);
+
+        TransferSpam t1 = new TransferSpam(bank, bank.allAccounts.get(0), bank.allAccounts.get(1));
+        TransferSpam t2 = new TransferSpam(bank, bank.allAccounts.get(1), bank.allAccounts.get(0));
+        TransferSpam t3 = new TransferSpam(bank, bank.allAccounts.get(2), bank.allAccounts.get(4));
+        TransferSpam t4 = new TransferSpam(bank, bank.allAccounts.get(1), bank.allAccounts.get(3));
+        TransferSpam t5 = new TransferSpam(bank, bank.allAccounts.get(3), bank.allAccounts.get(2));
+
+        t1.start();
+        t2.start();
+        t3.start();
+        t4.start();
+        t5.start();
+    }
+}