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Completed first draft of spec

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README.md
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# 12-functional-cli
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_This is an assignment to the class [Programmieren 3](https://hsro-inf-prg3.github.io) at the [University of Applied Sciences Rosenheim](http://www.fh-rosenheim.de)._
# Assignment 12: Functional - CLI variant
This assignment covers the basics of the Java 8 `Stream` API.
Streams are a functional concept and are relatively new in Java but they are very useful in combination with all kinds of _iterable_ data sources.
Streams may look a little bit complicated but when you got the concept they improve the readability of your code because they are more _data pipeline_ oriented as normal Java code is where you always have to iterate a collection with any kind of loop.
## Setup
1. Create a fork of this repository (button in the right upper corner)
1. Clone the project (get the link by clicking the green _Clone or download button_)
1. Import the project to your **IntelliJ**
_Remark: the given test suite will not completely succeed until you completed the first part of the assignment._
## Generators
A generator is component that creates a `Stream`.
There are two kinds of streams:
* finite
* infinite
A stream based on a list of objects is a finite stream as there are only a discrete number of elements that can be iterated.
Infinite streams are seaming to be a little bit weard but they are also very useful.
Think of a pseudo random number generator.
An infinite stream may be used to produce as many random numbers as required.
This generator may be implemented like this:
```java
public abstract class PseudoRandomNumberGenerator {
private PseudoRandomNumberGenerator() {
}
public static Stream<Integer> createStream() {
return Stream.generate(new PseudoRandomNumberSupplier());
}
private static class PseudoRandomNumberSupplier implements Supplier<Integer> {
private final Random random = new Random();
@Override
public Integer get() {
return random.nextInt();
}
}
}
```
The stream may be used like this:
```java
Stream<Integer> prngStream = createStream();
prngStream
.limit(10)
.forEach(System.out::println);
```
_Note that the `limit(...)` operation is mandatory because the stream is infinite and otherwise the whole operation will not terminate!_
In this part of the assignment you have to implement two generators as shown in the following UML:
![Generator spec](./assets/images/GeneratorSpec.svg)
_Remark: the UML is incomplete and is meant as implementation hint!_
1. Implement the `RandomJokeSupplier` - this supplier returns a random joke everytime it is used.
1. Implement the `AllJokesSupplier` - this supplier iterates all jokes in an infinite loop i.e. if all jokes were retrieved it continues with the first joke.
1. Implement the `JokeGenerator` - the generator returns infinite streams based on the implemented suppliers.
Note that the class structure is already there.
_Side note: when you have completed the implementation of the suppliers and the generator you can test your implementation with the given test suite._
## Using the generators
The given class `App` already implements a basic _CLI_ interface.
To complete the assignment implement the required code marked with a _TODO_.
The following flow diagram explains how to use the `jokesSource`:
![Stream flow](./assets/images/StreamFlow.svg)
Every chart element corresponds to a single method call on the stream of jokes.
For further reading about the Java 8 streams have a look at [this article](http://winterbe.com/posts/2014/07/31/java8-stream-tutorial-examples/).
_Remark: this part is technically an one-liner. To improve the readability add line breaks after every stream transformation. That should result in 5-6 lines of code._
If you want to improve your knowledge about streams you could extend the assignment by asking the user if he wants to filter the jokes for a specific category and if so which category (read the category as string).
Then `filter` the stream after the _unwrap_ transformation for the chosen category.
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@startuml GeneratorSpec
package java.util.function {
interface Supplier<T> {
T get();
}
}
package de.fhro.inf.prg3.a12.icndb {
class JokeGenerator {
+randomJokesStream(): Stream<ResponseWrapper<JokeDto>>
+jokesStream(): Stream<ResponseWrapper<JokeDto>>
}
package suppliers {
class AllJokesSupplier implements Supplier {
}
class RandomJokeSupplier implements Supplier {
}
}
JokeGenerator - - AllJokesSupplier : "uses"
JokeGenerator - - RandomJokeSupplier : "uses"
}
@enduml
PlantUML version 1.2017.20(Mon Dec 11 17:57:05 CET 2017)
(GPL source distribution)
Java Runtime: OpenJDK Runtime Environment
JVM: OpenJDK 64-Bit Server VM
Java Version: 1.8.0_144-b01
Operating System: Linux
OS Version: 4.14.8-1-ARCH
Default Encoding: UTF-8
Language: en
Country: US
--></g></svg>
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<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" contentScriptType="application/ecmascript" contentStyleType="text/css" height="469px" preserveAspectRatio="none" style="width:355px;height:469px;" version="1.1" viewBox="0 0 355 469" width="355px" zoomAndPan="magnify"><defs><filter height="300%" id="f9zskfbuzy97j" width="300%" x="-1" y="-1"><feGaussianBlur result="blurOut" stdDeviation="2.0"/><feColorMatrix in="blurOut" result="blurOut2" type="matrix" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .4 0"/><feOffset dx="4.0" dy="4.0" in="blurOut2" result="blurOut3"/><feBlend in="SourceGraphic" in2="blurOut3" mode="normal"/></filter></defs><g><ellipse cx="175" cy="18" fill="#000000" filter="url(#f9zskfbuzy97j)" rx="10" ry="10" style="stroke: none; stroke-width: 1.0;"/><rect fill="#FEFECE" filter="url(#f9zskfbuzy97j)" height="33.9688" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="176" x="87" y="68"/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="156" x="97" y="89.1387">Filter for non null objects</text><rect fill="#FEFECE" filter="url(#f9zskfbuzy97j)" height="33.9688" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="222" x="64" y="142"/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="202" x="74" y="163.1387">Skip as many values as required</text><rect fill="#FEFECE" filter="url(#f9zskfbuzy97j)" height="33.9688" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="338" x="6" y="216"/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="318" x="16" y="237.1387">Limit the stream to the required count of elements</text><rect fill="#FEFECE" filter="url(#f9zskfbuzy97j)" height="33.9688" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="309" x="20.5" y="290"/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="289" x="30.5" y="311.1387">use `map` to unwrap the `ResponseWrapper`</text><rect fill="#FEFECE" filter="url(#f9zskfbuzy97j)" height="33.9688" rx="12.5" ry="12.5" style="stroke: #A80036; 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stroke-width: 1.0;"/><!--link use `map` to unwrap the `ResponseWrapper` to Print the jokes to the STDOUT--><path d="M175,324.1631 C175,334.4368 175,347.6075 175,358.6831 " fill="none" id="use `map` to unwrap the `ResponseWrapper`-Print the jokes to the STDOUT" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="175,363.93,179,354.93,175,358.93,171,354.93,175,363.93" style="stroke: #A80036; stroke-width: 1.0;"/><!--link Print the jokes to the STDOUT to end--><path d="M175,398.2542 C175,408.9518 175,422.5657 175,432.8464 " fill="none" id="Print the jokes to the STDOUT-end" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="175,437.8855,179,428.8855,175,432.8855,171,428.8855,175,437.8855" style="stroke: #A80036; stroke-width: 1.0;"/><!--
@startuml StreamFlow
(*) - -> "Filter for non null objects"
- -> "Skip as many values as required"
- -> "Limit the stream to the required count of elements"
- -> "use `map` to unwrap the `ResponseWrapper`"
- -> "Print the jokes to the STDOUT"
- -> (*)
@enduml
PlantUML version 1.2017.20(Mon Dec 11 17:57:05 CET 2017)
(GPL source distribution)
Java Runtime: OpenJDK Runtime Environment
JVM: OpenJDK 64-Bit Server VM
Java Version: 1.8.0_144-b01
Operating System: Linux
OS Version: 4.14.8-1-ARCH
Default Encoding: UTF-8
Language: en
Country: US
--></g></svg>
\ No newline at end of file
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+ 27
− 0
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@startuml GeneratorSpec
package java.util.function {
interface Supplier<T> {
T get();
}
}
package de.fhro.inf.prg3.a12.icndb {
class JokeGenerator {
+randomJokesStream(): Stream<ResponseWrapper<JokeDto>>
+jokesStream(): Stream<ResponseWrapper<JokeDto>>
}
package suppliers {
class AllJokesSupplier implements Supplier {
}
class RandomJokeSupplier implements Supplier {
}
}
JokeGenerator -- AllJokesSupplier : "uses"
JokeGenerator -- RandomJokeSupplier : "uses"
}
@enduml
\ No newline at end of file
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+ 10
− 0
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@startuml StreamFlow
(*) --> "Filter for non null objects"
--> "Skip as many values as required"
--> "Limit the stream to the required count of elements"
--> "use `map` to unwrap the `ResponseWrapper`"
--> "Print the jokes to the STDOUT"
--> (*)
@enduml
\ No newline at end of file
src/main/java/de/fhro/inf/prg3/a12/icndb/JokeGenerator.java
+ 2
− 2
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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;
import java.util.stream.Stream;
/**
* @author Peter Kurfer
*/
......
src/main/java/de/fhro/inf/prg3/a12/icndb/suppliers/AllJokesSupplier.java
+ 1
− 2
View file @ 4cf944a3
......@@ -12,7 +12,7 @@ import org.apache.commons.lang3.NotImplementedException;
* @author Peter Kurfer
*/
public final class AllJokesSupplier implements Supplier<ResponseWrapper<JokeDto>> {
public final class AllJokesSupplier {
private final ICNDBApi icndbApi;
......@@ -22,7 +22,6 @@ public final class AllJokesSupplier implements Supplier<ResponseWrapper<JokeDto>
* 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
......
src/main/java/de/fhro/inf/prg3/a12/icndb/suppliers/RandomJokeSupplier.java
+ 1
− 2
View file @ 4cf944a3
......@@ -12,7 +12,7 @@ import org.apache.commons.lang3.NotImplementedException;
* @author Peter Kurfer
*/
public final class RandomJokeSupplier implements Supplier<ResponseWrapper<JokeDto>> {
public final class RandomJokeSupplier {
private final ICNDBApi icndbApi;
......@@ -20,7 +20,6 @@ public final class RandomJokeSupplier implements Supplier<ResponseWrapper<JokeDt
icndbApi = ICNDBService.getInstance();
}
@Override
public ResponseWrapper<JokeDto> get() {
/* TODO fetch a random joke synchronously
* if an exception occurs return null */
......
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