diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..6c234cdb79640f2147fad6b43c5394692e20ba67
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,40 @@
+# Created by .ignore support plugin (hsz.mobi)
+### Gradle template
+.gradle
+/build/
+
+# Ignore Gradle GUI config
+gradle-app.setting
+
+# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
+!gradle-wrapper.jar
+
+# Cache of project
+.gradletasknamecache
+
+# User-specific stuff:
+**/.idea/
+
+# CMake
+cmake-build-debug/
+
+## File-based project format:
+*.iws
+*.iml
+
+## Plugin-specific files:
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000000000000000000000000000000000000..1a567fa0a6d22ae1b897c5a97def33c3e2d325e5
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,44 @@
+buildscript {
+ repositories {
+ mavenCentral()
+ jcenter()
+ }
+
+ dependencies {
+ classpath "com.github.ben-manes:gradle-versions-plugin:$gradle_versions_plugin_version"
+ classpath "org.junit.platform:junit-platform-gradle-plugin:$gradle_junit_plugin_version"
+ }
+}
+
+apply plugin: 'java'
+apply plugin: 'application'
+apply plugin: 'com.github.ben-manes.versions'
+apply plugin: 'org.junit.platform.gradle.plugin'
+
+repositories {
+ mavenLocal()
+ jcenter()
+ mavenCentral()
+}
+
+dependencies {
+ /* Commons Lang3 */
+ compile "org.apache.commons:commons-lang3:$commons_lang_version"
+
+ /* Retrofit */
+ compile "com.squareup.retrofit2:retrofit:$retrofit2_version"
+ compile "com.squareup.retrofit2:converter-gson:$retrofit2_version"
+ compile "com.squareup.retrofit2:adapter-java8:$retrofit2_version"
+
+ /* JUnit 5 */
+ testCompile("org.junit.jupiter:junit-jupiter-api:${junitJupiterVersion}")
+ testRuntime("org.junit.jupiter:junit-jupiter-engine:${junitJupiterVersion}")
+ testRuntime("org.junit.platform:junit-platform-launcher:${junitPlatformVersion}")
+ testRuntime("org.apache.logging.log4j:log4j-core:${log4jVersion}")
+ testRuntime("org.apache.logging.log4j:log4j-jul:${log4jVersion}")
+}
+
+mainClassName = 'de.fhro.inf.prg3.a12.App'
+
+sourceCompatibility = 1.8
+targetCompatibility = 1.8
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 0000000000000000000000000000000000000000..03f07ffd4e95a4a130f1e5963ca4b81260df3da9
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1,8 @@
+gradle_versions_plugin_version=0.17.0
+gradle_junit_plugin_version=1.1.0-M1
+
+commons_lang_version=3.7
+retrofit2_version=2.3.0
+junitPlatformVersion = 1.1.0-M1
+junitJupiterVersion = 5.1.0-M1
+log4jVersion = 2.10.0
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000000000000000000000000000000000000..01b8bf6b1f99cad9213fc495b33ad5bbab8efd20
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000000000000000000000000000000000000..933b6473ce1ea83ca681969501e2c05453c313a1
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-bin.zip
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000000000000000000000000000000000000..cccdd3d517fc5249beaefa600691cf150f2fa3e6
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+## Gradle start up script for UN*X
+##
+##############################################################################
+
+# 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\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+ echo "$*"
+}
+
+die () {
+ echo
+ echo "$*"
+ echo
+ exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+ CYGWIN* )
+ cygwin=true
+ ;;
+ Darwin* )
+ darwin=true
+ ;;
+ MINGW* )
+ msys=true
+ ;;
+ NONSTOP* )
+ nonstop=true
+ ;;
+esac
+
+CLASSPATH=$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: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+ fi
+else
+ JAVACMD="java"
+ which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "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 "$CLASSPATH"`
+ JAVACMD=`cygpath --unix "$JAVACMD"`
+
+ # 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
+
+# Escape application args
+save () {
+ for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+ echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+ cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000000000000000000000000000000000000..f9553162f122c71b34635112e717c3e733b5b212
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,84 @@
+@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=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@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=
+
+@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 Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_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=%*
+
+: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
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000000000000000000000000000000000000..b2b6e8f8abbef65bdb75b9742536e77191c8a48c
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,18 @@
+/*
+ * This settings file was generated by the Gradle 'init' task.
+ *
+ * The settings file is used to specify which projects to include in your build.
+ * In a single project build this file can be empty or even removed.
+ *
+ * Detailed information about configuring a multi-project build in Gradle can be found
+ * in the user guide at https://docs.gradle.org/4.4/userguide/multi_project_builds.html
+ */
+
+/*
+// To declare projects as part of a multi-project build use the 'include' method
+include 'shared'
+include 'api'
+include 'services:webservice'
+*/
+
+rootProject.name = '12-functional-cli'
diff --git a/src/main/java/de/fhro/inf/prg3/a12/App.java b/src/main/java/de/fhro/inf/prg3/a12/App.java
new file mode 100644
index 0000000000000000000000000000000000000000..6d2d31d0e3960fb1b47e3ac3289eee4851f0c8e9
--- /dev/null
+++ b/src/main/java/de/fhro/inf/prg3/a12/App.java
@@ -0,0 +1,83 @@
+package de.fhro.inf.prg3.a12;
+
+import de.fhro.inf.prg3.a12.icndb.JokeGenerator;
+import de.fhro.inf.prg3.a12.model.JokeDto;
+import de.fhro.inf.prg3.a12.model.ResponseWrapper;
+
+import java.util.Scanner;
+import java.util.stream.Stream;
+
+public abstract class App {
+
+ private static final Scanner inputScanner = new Scanner(System.in);
+ private static final JokeGenerator jokeGenerator = new JokeGenerator();
+
+ public static void main(String[] args) {
+ boolean shouldQuit = false;
+ int jokeCount;
+ int skipCount;
+ do {
+ jokeCount = readInt("How many jokes do you want?");
+ skipCount = readInt("How many jokes do you want to skip");
+
+ Stream<ResponseWrapper<JokeDto>> jokesSource;
+ switch (readJokeSource()) {
+ case Random:
+ jokesSource = jokeGenerator.randomJokesStream();
+ break;
+ default:
+ jokesSource = jokeGenerator.jokesStream();
+ }
+
+ /* TODO consume the `jokesSource`
+ * filter it for non null objects
+ * use `skip` and `limit` to retrieve the required elements
+ * use `map` to unwrap the ResponseWrapper value
+ * and print the jokes to the STDOUT */
+
+ System.out.println("If you want to quit press [Q] otherwise press [C] to continue.");
+ String input = inputScanner.next();
+ if (input.equals("q") || input.equals("Q")) {
+ shouldQuit = true;
+ }
+ } while (!shouldQuit);
+ System.exit(0);
+ }
+
+ private static int readInt(String message) {
+ System.out.println(message);
+ do {
+ try {
+ int input = inputScanner.nextInt();
+ if (input >= 0) return input;
+ } catch (Exception e) {
+ System.out.println("Error while reading integer.");
+ }
+ } while (true);
+ }
+
+ private static JokeSource readJokeSource() {
+ System.out.println("Which joke source do you want to use?");
+ System.out.println("1) Random jokes");
+ System.out.println("2) Linear by id");
+
+ do {
+ try {
+ int selection = inputScanner.nextInt();
+ switch (selection) {
+ case 1:
+ return JokeSource.Random;
+ default:
+ return JokeSource.Linear;
+ }
+ } catch (Exception e) {
+ System.out.println("No valid selection");
+ }
+ } while (true);
+ }
+
+ enum JokeSource {
+ Random,
+ Linear
+ }
+}
diff --git a/src/main/java/de/fhro/inf/prg3/a12/icndb/ICNDBApi.java b/src/main/java/de/fhro/inf/prg3/a12/icndb/ICNDBApi.java
new file mode 100644
index 0000000000000000000000000000000000000000..6693eede88a3e7763407c4ce3927787eb65d78b1
--- /dev/null
+++ b/src/main/java/de/fhro/inf/prg3/a12/icndb/ICNDBApi.java
@@ -0,0 +1,29 @@
+package de.fhro.inf.prg3.a12.icndb;
+
+import de.fhro.inf.prg3.a12.model.JokeDto;
+import de.fhro.inf.prg3.a12.model.ResponseWrapper;
+import retrofit2.http.GET;
+import retrofit2.http.Path;
+import retrofit2.http.Query;
+
+import java.util.concurrent.CompletableFuture;
+
+/**
+ * @author Peter Kurfer
+ * Created on 12/28/17.
+ */
+public interface ICNDBApi {
+
+ @GET("/jokes/count")
+ CompletableFuture<ResponseWrapper<Integer>> getJokeCount();
+
+ @GET("/jokes/random")
+ CompletableFuture<ResponseWrapper<JokeDto>> getRandomJoke();
+
+ @GET("/jokes/random")
+ CompletableFuture<ResponseWrapper<JokeDto>> getRandomJoke(@Query("firstName") String firstName, @Query("lastName") String lastName);
+
+ @GET("/jokes/{id}")
+ CompletableFuture<ResponseWrapper<JokeDto>> getJoke(@Path("id") int number);
+
+}
diff --git a/src/main/java/de/fhro/inf/prg3/a12/icndb/ICNDBService.java b/src/main/java/de/fhro/inf/prg3/a12/icndb/ICNDBService.java
new file mode 100644
index 0000000000000000000000000000000000000000..d443be6bc1585792515bae8f21f13b9bf2799029
--- /dev/null
+++ b/src/main/java/de/fhro/inf/prg3/a12/icndb/ICNDBService.java
@@ -0,0 +1,55 @@
+package de.fhro.inf.prg3.a12.icndb;
+
+import de.fhro.inf.prg3.a12.model.JokeDto;
+import de.fhro.inf.prg3.a12.model.ResponseWrapper;
+import retrofit2.Retrofit;
+import retrofit2.adapter.java8.Java8CallAdapterFactory;
+import retrofit2.converter.gson.GsonConverterFactory;
+
+import java.util.concurrent.CompletableFuture;
+
+/**
+ * @author Peter Kurfer
+ * Created on 12/28/17.
+ */
+public final class ICNDBService implements ICNDBApi {
+
+ private static final ICNDBService instance = new ICNDBService();
+
+ private final ICNDBApi icndbApi;
+
+ public static ICNDBService getInstance() {
+ return instance;
+ }
+
+ private ICNDBService() {
+ /* Initialize Retrofit */
+ Retrofit retrofit = new Retrofit.Builder()
+ .baseUrl("http://api.icndb.com")
+ .addConverterFactory(GsonConverterFactory.create())
+ .addCallAdapterFactory(Java8CallAdapterFactory.create())
+ .build();
+
+ icndbApi = retrofit.create(ICNDBApi.class);
+ }
+
+ @Override
+ public CompletableFuture<ResponseWrapper<Integer>> getJokeCount() {
+ return icndbApi.getJokeCount();
+ }
+
+ @Override
+ public CompletableFuture<ResponseWrapper<JokeDto>> getRandomJoke() {
+ return icndbApi.getRandomJoke();
+ }
+
+ @Override
+ public CompletableFuture<ResponseWrapper<JokeDto>> getRandomJoke(String firstName, String lastName) {
+ return icndbApi.getRandomJoke(firstName, lastName);
+ }
+
+ @Override
+ public CompletableFuture<ResponseWrapper<JokeDto>> getJoke(int number) {
+ return icndbApi.getJoke(number);
+ }
+}
diff --git a/src/main/java/de/fhro/inf/prg3/a12/icndb/JokeGenerator.java b/src/main/java/de/fhro/inf/prg3/a12/icndb/JokeGenerator.java
new file mode 100644
index 0000000000000000000000000000000000000000..e22479a12d921f1720b34f159e676390437c6889
--- /dev/null
+++ b/src/main/java/de/fhro/inf/prg3/a12/icndb/JokeGenerator.java
@@ -0,0 +1,24 @@
+package de.fhro.inf.prg3.a12.icndb;
+
+import java.util.stream.Stream;
+
+import de.fhro.inf.prg3.a12.model.JokeDto;
+import de.fhro.inf.prg3.a12.model.ResponseWrapper;
+import org.apache.commons.lang3.NotImplementedException;
+
+/**
+ * @author Peter Kurfer
+ */
+
+public final class JokeGenerator {
+
+ public Stream<ResponseWrapper<JokeDto>> randomJokesStream() {
+ /* TODO create new Stream of random jokes */
+ throw new NotImplementedException("Method `randomJokeStream()` is not implemented");
+ }
+
+ public Stream<ResponseWrapper<JokeDto>> jokesStream() {
+ /* TODO create a new Stream of all jokes */
+ throw new NotImplementedException("Method `jokesStream()` is not implemented");
+ }
+}
diff --git a/src/main/java/de/fhro/inf/prg3/a12/icndb/suppliers/AllJokesSupplier.java b/src/main/java/de/fhro/inf/prg3/a12/icndb/suppliers/AllJokesSupplier.java
new file mode 100644
index 0000000000000000000000000000000000000000..ea247cc17f87ac7d88cf03182dbfe7d5d3978bb5
--- /dev/null
+++ b/src/main/java/de/fhro/inf/prg3/a12/icndb/suppliers/AllJokesSupplier.java
@@ -0,0 +1,35 @@
+package de.fhro.inf.prg3.a12.icndb.suppliers;
+
+import java.util.function.Supplier;
+
+import de.fhro.inf.prg3.a12.icndb.ICNDBApi;
+import de.fhro.inf.prg3.a12.icndb.ICNDBService;
+import de.fhro.inf.prg3.a12.model.JokeDto;
+import de.fhro.inf.prg3.a12.model.ResponseWrapper;
+import org.apache.commons.lang3.NotImplementedException;
+
+/**
+ * @author Peter Kurfer
+ */
+
+public final class AllJokesSupplier implements Supplier<ResponseWrapper<JokeDto>> {
+
+ private final ICNDBApi icndbApi;
+
+ public AllJokesSupplier() {
+ icndbApi = ICNDBService.getInstance();
+ /* TODO fetch the total count of jokes the API is aware of
+ * to determine when all jokes are iterated and the counters have to be reset */
+ }
+
+ @Override
+ public ResponseWrapper<JokeDto> get() {
+ /* TODO retrieve the next joke
+ * note that there might be IDs that are not present in the database
+ * you have to catch an exception and continue if no joke was retrieved to an ID
+ * if you retrieved all jokes (count how many jokes you successfully fetched from the API)
+ * reset the counters and continue at the beginning */
+ throw new NotImplementedException("Method `get()` is not implemented");
+ }
+
+}
diff --git a/src/main/java/de/fhro/inf/prg3/a12/icndb/suppliers/RandomJokeSupplier.java b/src/main/java/de/fhro/inf/prg3/a12/icndb/suppliers/RandomJokeSupplier.java
new file mode 100644
index 0000000000000000000000000000000000000000..7c35ad496a7669fbd33db3e9479614f2b5ae52e5
--- /dev/null
+++ b/src/main/java/de/fhro/inf/prg3/a12/icndb/suppliers/RandomJokeSupplier.java
@@ -0,0 +1,29 @@
+package de.fhro.inf.prg3.a12.icndb.suppliers;
+
+import java.util.function.Supplier;
+
+import de.fhro.inf.prg3.a12.icndb.ICNDBApi;
+import de.fhro.inf.prg3.a12.icndb.ICNDBService;
+import de.fhro.inf.prg3.a12.model.JokeDto;
+import de.fhro.inf.prg3.a12.model.ResponseWrapper;
+import org.apache.commons.lang3.NotImplementedException;
+
+/**
+ * @author Peter Kurfer
+ */
+
+public final class RandomJokeSupplier implements Supplier<ResponseWrapper<JokeDto>> {
+
+ private final ICNDBApi icndbApi;
+
+ public RandomJokeSupplier() {
+ icndbApi = ICNDBService.getInstance();
+ }
+
+ @Override
+ public ResponseWrapper<JokeDto> get() {
+ /* TODO fetch a random joke synchronously
+ * if an exception occurs return null */
+ throw new NotImplementedException("Method `get()` is not implemented");
+ }
+}
diff --git a/src/main/java/de/fhro/inf/prg3/a12/model/JokeDto.java b/src/main/java/de/fhro/inf/prg3/a12/model/JokeDto.java
new file mode 100644
index 0000000000000000000000000000000000000000..9998c87437a0a7f819a5c5ef3d5149ac30f870da
--- /dev/null
+++ b/src/main/java/de/fhro/inf/prg3/a12/model/JokeDto.java
@@ -0,0 +1,82 @@
+package de.fhro.inf.prg3.a12.model;
+
+import org.apache.commons.lang3.builder.EqualsBuilder;
+import org.apache.commons.lang3.builder.HashCodeBuilder;
+import org.apache.commons.lang3.builder.ToStringBuilder;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @author Peter Kurfer
+ * Created on 12/28/17.
+ */
+public class JokeDto {
+
+ private int id;
+ private String joke;
+ private List<String> categories;
+
+ public JokeDto() {
+ categories = new ArrayList<>();
+ }
+
+ public int getId() {
+ return id;
+ }
+
+ public void setId(int id) {
+ this.id = id;
+ }
+
+ public String getJoke() {
+ return joke;
+ }
+
+ public void setJoke(String joke) {
+ this.joke = joke;
+ }
+
+ public List<String> getCategories() {
+ return categories;
+ }
+
+ public void setCategories(List<String> categories) {
+ if(categories == null) return;
+ this.categories = categories;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) return true;
+
+ if (!(o instanceof JokeDto)) return false;
+
+ JokeDto joke1 = (JokeDto) o;
+
+ return new EqualsBuilder()
+ .append(getId(), joke1.getId())
+ .append(getJoke(), joke1.getJoke())
+ .append(getCategories(), joke1.getCategories())
+ .isEquals();
+ }
+
+ @Override
+ public int hashCode() {
+ return new HashCodeBuilder(17, 37)
+ .append(getId())
+ .append(getJoke())
+ .append(getCategories())
+ .toHashCode();
+ }
+
+ @Override
+ public String toString() {
+ return new ToStringBuilder(this)
+ .append("id", id)
+ .append("joke", joke)
+ .append("categories", categories)
+ .toString();
+ }
+
+}
diff --git a/src/main/java/de/fhro/inf/prg3/a12/model/ResponseWrapper.java b/src/main/java/de/fhro/inf/prg3/a12/model/ResponseWrapper.java
new file mode 100644
index 0000000000000000000000000000000000000000..bba5378bb1fbb44cd326c458d739914e8d783292
--- /dev/null
+++ b/src/main/java/de/fhro/inf/prg3/a12/model/ResponseWrapper.java
@@ -0,0 +1,62 @@
+package de.fhro.inf.prg3.a12.model;
+
+import org.apache.commons.lang3.builder.EqualsBuilder;
+import org.apache.commons.lang3.builder.HashCodeBuilder;
+
+/**
+ * @author Peter Kurfer
+ * Created on 12/28/17.
+ */
+public class ResponseWrapper<T> {
+
+ private String type;
+
+ private T value;
+
+ public ResponseWrapper() {
+ type = "error";
+ }
+
+ public String getType() {
+ return type;
+ }
+
+ public void setType(String type) {
+ this.type = type;
+ }
+
+ public T getValue() {
+ return value;
+ }
+
+ public void setValue(T value) {
+ this.value = value;
+ }
+
+ public boolean isSuccessfull() {
+ return type != null && type.equals("success");
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) return true;
+
+ if (!(o instanceof ResponseWrapper)) return false;
+
+ ResponseWrapper<?> that = (ResponseWrapper<?>) o;
+
+ return new EqualsBuilder()
+ .append(getType(), that.getType())
+ .append(getValue(), that.getValue())
+ .isEquals();
+ }
+
+ @Override
+ public int hashCode() {
+ return new HashCodeBuilder(17, 37)
+ .append(getType())
+ .append(getValue())
+ .toHashCode();
+ }
+
+}
diff --git a/src/test/java/de/fhro/inf/prg3/a12/icndb/ICNDBTests.java b/src/test/java/de/fhro/inf/prg3/a12/icndb/ICNDBTests.java
new file mode 100644
index 0000000000000000000000000000000000000000..80cd1d6e8176bb10bf669b00eba3d145efdcfd6e
--- /dev/null
+++ b/src/test/java/de/fhro/inf/prg3/a12/icndb/ICNDBTests.java
@@ -0,0 +1,87 @@
+package de.fhro.inf.prg3.a12.icndb;
+
+import de.fhro.inf.prg3.a12.model.JokeDto;
+import de.fhro.inf.prg3.a12.model.ResponseWrapper;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.logging.Logger;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * @author Peter Kurfer
+ */
+
+public class ICNDBTests {
+ private static final Logger logger = Logger.getLogger(ICNDBTests.class.getName());
+ private static final int REQUEST_COUNT = 100;
+
+ private ICNDBApi icndbApi;
+
+ public ICNDBTests() {
+ this.icndbApi = ICNDBService.getInstance();
+ }
+
+ @Test
+ void testCollision() throws ExecutionException, InterruptedException {
+ Set<Integer> jokeNumbers = new HashSet<>();
+ int requests = 0;
+ boolean collision = false;
+
+ while (requests++ < REQUEST_COUNT) {
+ CompletableFuture<ResponseWrapper<JokeDto>> jokeCall = icndbApi.getRandomJoke();
+ JokeDto joke = jokeCall.get().getValue();
+
+ if(jokeNumbers.contains(joke.getId())) {
+ logger.info(String.format("Collision at joke %s", joke.getId()));
+ collision = true;
+ break;
+ }
+
+ jokeNumbers.add(joke.getId());
+ logger.info(joke.toString());
+ }
+
+ assertTrue(collision, String.format("Completed %d requests without collision; consider increasing REQUEST_COUNT", requests));
+ }
+
+ @Test
+ void testGetRandomJokeWithChangedName() throws ExecutionException, InterruptedException {
+ JokeDto j = icndbApi.getRandomJoke("Bruce", "Wayne").get().getValue();
+ assertNotNull(j);
+ assertFalse(j.getJoke().contains("Chuck"));
+ assertFalse(j.getJoke().contains("Norris"));
+ logger.info(j.toString());
+ }
+
+ @Test
+ void testGetJokeById() throws ExecutionException, InterruptedException {
+
+ List<Integer> randomIds = new ArrayList<>(10);
+
+ for(int i = 0; i < 10; i++) {
+ randomIds.add(icndbApi.getRandomJoke().get().getValue().getId());
+ }
+
+ for(Integer id : randomIds) {
+ JokeDto j = icndbApi.getJoke(id).get().getValue();
+ assertNotNull(j);
+ assertTrue(randomIds.contains(j.getId()));
+ logger.info(j.toString());
+ }
+ }
+
+ @Test
+ void testGetJokeCount() throws ExecutionException, InterruptedException {
+ int jokeCount = icndbApi.getJokeCount().get().getValue();
+
+ assertNotEquals(0, jokeCount);
+ }
+
+}
diff --git a/src/test/java/de/fhro/inf/prg3/a12/icndb/JokesGeneratorTests.java b/src/test/java/de/fhro/inf/prg3/a12/icndb/JokesGeneratorTests.java
new file mode 100644
index 0000000000000000000000000000000000000000..688c710457a44a32a5c5b456d7e5df051a73a107
--- /dev/null
+++ b/src/test/java/de/fhro/inf/prg3/a12/icndb/JokesGeneratorTests.java
@@ -0,0 +1,55 @@
+package de.fhro.inf.prg3.a12.icndb;
+
+import de.fhro.inf.prg3.a12.model.JokeDto;
+import de.fhro.inf.prg3.a12.model.ResponseWrapper;
+import org.junit.jupiter.api.Test;
+
+import java.time.Duration;
+import java.util.Objects;
+import java.util.stream.Stream;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTimeout;
+
+/**
+ * @author Peter Kurfer
+ * Created on 12/28/17.
+ */
+class JokesGeneratorTests {
+
+ private JokeGenerator jokeGenerator = new JokeGenerator();
+
+ @Test
+ void testRandomStream() {
+ assertTimeout(Duration.ofSeconds(5L), () -> {
+ Stream<ResponseWrapper<JokeDto>> randomJokesStream = jokeGenerator.randomJokesStream();
+
+ randomJokesStream
+ .filter(Objects::nonNull)
+ .map(ResponseWrapper::getValue)
+ .skip(3)
+ .limit(5)
+ .forEach(j -> {
+ assertNotNull(j.getJoke());
+ System.out.println(j.getJoke());
+ });
+ });
+ }
+
+
+ @Test
+ void testJokesStream() {
+ assertTimeout(Duration.ofMinutes(1L), () -> {
+ jokeGenerator.jokesStream()
+ .filter(Objects::nonNull)
+ .map(ResponseWrapper::getValue)
+ .skip(200L)
+ .limit(400L)
+ .forEach(j -> {
+ assertNotNull(j.getJoke());
+ System.out.println(j.getJoke());
+ });
+ });
+ }
+
+}