From 39bc85bf5592ef1ca4e7c7e3f107f50141f58218 Mon Sep 17 00:00:00 2001
From: Gustavo Martin Morcuende <gu.martinm@gmail.com>
Date: Fri, 2 Dec 2016 23:44:05 +0100
Subject: [PATCH] RxJava: using flatMap method

---
 .../src/main/java/de/rxjava/tests/MainRxJava.java  |  6 +--
 .../rxjava/tests/service/impl/AsyncHTTPClient.java |  7 ++-
 .../rxjava/tests/service/impl/FlatMapTestImpl.java | 61 ++++++++++++++++++++++
 3 files changed, 67 insertions(+), 7 deletions(-)
 create mode 100644 Allgemeines/RxJava/src/main/java/de/rxjava/tests/service/impl/FlatMapTestImpl.java

diff --git a/Allgemeines/RxJava/src/main/java/de/rxjava/tests/MainRxJava.java b/Allgemeines/RxJava/src/main/java/de/rxjava/tests/MainRxJava.java
index 09c0d70..1999493 100644
--- a/Allgemeines/RxJava/src/main/java/de/rxjava/tests/MainRxJava.java
+++ b/Allgemeines/RxJava/src/main/java/de/rxjava/tests/MainRxJava.java
@@ -1,12 +1,12 @@
 package de.rxjava.tests;
 
 import de.rxjava.tests.service.impl.AsyncHTTPClient;
+import de.rxjava.tests.service.impl.FlatMapTestImpl;
 
 public class MainRxJava {
 
 	public static void main(String[] args) {
-		AsyncHTTPClient asyncHTTPClient = new AsyncHTTPClient();
-		
-		asyncHTTPClient.getPages();
+		new AsyncHTTPClient().getPages();
+		new FlatMapTestImpl().getWords();
 	}
 }
diff --git a/Allgemeines/RxJava/src/main/java/de/rxjava/tests/service/impl/AsyncHTTPClient.java b/Allgemeines/RxJava/src/main/java/de/rxjava/tests/service/impl/AsyncHTTPClient.java
index 331356d..0a0f11e 100644
--- a/Allgemeines/RxJava/src/main/java/de/rxjava/tests/service/impl/AsyncHTTPClient.java
+++ b/Allgemeines/RxJava/src/main/java/de/rxjava/tests/service/impl/AsyncHTTPClient.java
@@ -1,7 +1,6 @@
 package de.rxjava.tests.service.impl;
 
 import java.io.IOException;
-import java.net.MalformedURLException;
 import java.net.URL;
 
 import de.rxjava.tests.httpclient.CustomHTTPClient;
@@ -27,7 +26,7 @@ public class AsyncHTTPClient {
 		});
 		
 		
-		System.out.println("YOU SEE ME FIRST!!!!");
+		System.out.println("AsyncHTTPClient: YOU SEE ME FIRST!!!!");
 		
 		
     	try {	
@@ -42,7 +41,7 @@ public class AsyncHTTPClient {
 	private Observable<String> getDataAsync(String uri) {
         return getDataSync(uri)
         		.subscribeOn(Schedulers.io());  // Creates a pool of threads for us which will run the code implemented below :)
-                                                // THIE METHOD DOES NOT START TO RUN MY CODE!!! IT IS DONE BY subscribe METHOD!!!
+                                                // THIS METHOD DOES NOT START TO RUN MY CODE!!! IT IS DONE BY subscribe METHOD!!!
     }
 	
 	private Observable<String> getDataSync(String uri) {
@@ -52,7 +51,7 @@ public class AsyncHTTPClient {
         	try {
 				data = CustomHTTPClient.newInstance("RxJavaTest").retrieveDataAsString(new URL(uri));
 				
-				// Making it slower as if having a bad connection :)
+				// Making it slower as if I had a bad connection :)
 				Thread.sleep(2000);
 			} catch (InterruptedException exception) {
 				// Do not forget good patterns when dealing with InterruptedException :(
diff --git a/Allgemeines/RxJava/src/main/java/de/rxjava/tests/service/impl/FlatMapTestImpl.java b/Allgemeines/RxJava/src/main/java/de/rxjava/tests/service/impl/FlatMapTestImpl.java
new file mode 100644
index 0000000..a06bf33
--- /dev/null
+++ b/Allgemeines/RxJava/src/main/java/de/rxjava/tests/service/impl/FlatMapTestImpl.java
@@ -0,0 +1,61 @@
+package de.rxjava.tests.service.impl;
+
+import java.util.Arrays;
+import java.util.List;
+
+import rx.Observable;
+import rx.schedulers.Schedulers;
+
+public class FlatMapTestImpl {
+
+	
+	public void getWords() {
+		
+		getWordsAsync()
+		.flatMap(words -> {                // flatmap method enables us to return one Observable. The subscribe method does not have such feature.
+			return Observable.from(words);
+		})
+		.subscribe(word -> {               //Unlike JavaScript Promises, we can call many times the same promise without resolving it.
+			                               //This stuff would be impossible in JavaScript :)
+			System.out.println(word);
+		});
+		
+		System.out.println("FlatMapTestImpl: YOU SEE ME FIRST!!!!");
+		
+    	try {	
+			Thread.sleep(30000);
+		} catch (InterruptedException exception) {
+			// Do not forget good patterns when dealing with InterruptedException :(
+			Thread.currentThread().interrupt();
+		}
+
+	}
+	
+	private Observable<List<String>> getWordsAsync() {
+        return getWordsSync()
+        		.subscribeOn(Schedulers.io());  // Creates a pool of threads for us which will run the code implemented below :)
+                                                // THIS METHOD DOES NOT START TO RUN MY CODE!!! IT IS DONE BY subscribe METHOD!!!
+    }
+	
+	private Observable<List<String>> getWordsSync() {
+        return Observable.create(observer -> {
+        	System.out.println(Thread.currentThread().getName());
+        	
+        	String[] words = { "gus", "stuff", "given", "no", "way" };
+        	try {
+				// Making it slower as if having a bad connection :)
+				Thread.sleep(2000);
+			} catch (InterruptedException exception) {
+				// Do not forget good patterns when dealing with InterruptedException :(
+				Thread.currentThread().interrupt();
+				
+				observer.onError(exception);
+			}
+
+        	// When do you use this stuff?
+        	// observer.onCompleted();
+        	
+            observer.onNext(Arrays.asList(words));    
+        });
+    }
+}
-- 
2.1.4