Remove unnecessary Observable constructor

- fixed unit tests that relied on it

Author: benjchristensen

rxjava-core/src/main/java/rx/Observable.java

@@ -102,17 +102,15 @@
  * <p>
  * <img width="640" src="https://github.com/Netflix/RxJava/wiki/images/rx-operators/legend.png">
  * <p>
- * For more information see the <a href="https://github.com/Netflix/RxJava/wiki/Observable">RxJava
- * Wiki</a>
+ * For more information see the <a href="https://github.com/Netflix/RxJava/wiki/Observable">RxJava Wiki</a>
  * 
  * @param <T>
  */
 public class Observable<T> {
 
-    //TODO use a consistent parameter naming scheme (for example: for all operators that modify a source Observable, the parameter representing that source Observable should have the same name, e.g. "source" -- currently such parameters are named any of "sequence", "that", "source", "items", or "observable")
-
-    private final static RxJavaObservableExecutionHook hook = RxJavaPlugins.getInstance().getObservableExecutionHook();
-
+    /**
+     * Executed when 'subscribe' is invoked.
+     */
     private final OnSubscribeFunc<T> onSubscribe;
 
     /**
@@ -125,7 +123,7 @@ public static interface OnSubscribeFunc<T> extends Function {
         public Subscription onSubscribe(Observer<? super T> t1);
 
     }
-    
+
     /**
      * Observable with Function to execute when subscribed to.
      * <p>
@@ -139,10 +137,8 @@ protected Observable(OnSubscribeFunc<T> onSubscribe) {
         this.onSubscribe = onSubscribe;
     }
 
-    protected Observable() {
-        this(null);
-        //TODO should this be made private to prevent it? It really serves no good purpose and only confuses things. Unit tests are incorrectly using it today
-    }
+    private final static RxJavaObservableExecutionHook hook = RxJavaPlugins.getInstance().getObservableExecutionHook();
+
 
     /**
      * An {@link Observer} must call an Observable's {@code subscribe} method in order to

rxjava-core/src/main/java/rx/observables/BlockingObservable.java

@@ -64,14 +64,6 @@ protected BlockingObservable(OnSubscribeFunc<T> onSubscribe) {
         super(onSubscribe);
     }
 
-    /**
-     * Used to prevent public instantiation
-     */
-    @SuppressWarnings("unused")
-    private BlockingObservable() {
-        // prevent public instantiation
-    }
-
     /**
      * Convert an Observable into a BlockingObservable.
      */

rxjava-core/src/main/java/rx/operators/OperationCombineLatest.java

@@ -362,7 +362,7 @@ public void testCombineLatestWithFunctionThatThrowsAnException() {
             TestObservable w1 = new TestObservable();
             TestObservable w2 = new TestObservable();
 
-            Observable<String> combined = Observable.create(combineLatest(w1, w2, new Func2<String, String, String>() {
+            Observable<String> combined = Observable.create(combineLatest(Observable.create(w1), Observable.create(w2), new Func2<String, String, String>() {
                 @Override
                 public String call(String v1, String v2) {
                     throw new RuntimeException("I don't work.");
@@ -387,7 +387,7 @@ public void testCombineLatestDifferentLengthObservableSequences1() {
             TestObservable w2 = new TestObservable();
             TestObservable w3 = new TestObservable();
 
-            Observable<String> combineLatestW = Observable.create(combineLatest(w1, w2, w3, getConcat3StringsCombineLatestFunction()));
+            Observable<String> combineLatestW = Observable.create(combineLatest(Observable.create(w1), Observable.create(w2), Observable.create(w3), getConcat3StringsCombineLatestFunction()));
             combineLatestW.subscribe(w);
 
             /* simulate sending data */
@@ -425,7 +425,7 @@ public void testCombineLatestDifferentLengthObservableSequences2() {
             TestObservable w2 = new TestObservable();
             TestObservable w3 = new TestObservable();
 
-            Observable<String> combineLatestW = Observable.create(combineLatest(w1, w2, w3, getConcat3StringsCombineLatestFunction()));
+            Observable<String> combineLatestW = Observable.create(combineLatest(Observable.create(w1), Observable.create(w2), Observable.create(w3), getConcat3StringsCombineLatestFunction()));
             combineLatestW.subscribe(w);
 
             /* simulate sending data */
@@ -461,7 +461,7 @@ public void testCombineLatestWithInterleavingSequences() {
             TestObservable w2 = new TestObservable();
             TestObservable w3 = new TestObservable();
 
-            Observable<String> combineLatestW = Observable.create(combineLatest(w1, w2, w3, getConcat3StringsCombineLatestFunction()));
+            Observable<String> combineLatestW = Observable.create(combineLatest(Observable.create(w1), Observable.create(w2), Observable.create(w3), getConcat3StringsCombineLatestFunction()));
             combineLatestW.subscribe(w);
 
             /* simulate sending data */
@@ -936,12 +936,12 @@ private static String getStringValue(Object o) {
             }
         }
 
-        private static class TestObservable extends Observable<String> {
+        private static class TestObservable implements OnSubscribeFunc<String> {
 
             Observer<? super String> observer;
 
             @Override
-            public Subscription subscribe(Observer<? super String> observer) {
+            public Subscription onSubscribe(Observer<? super String> observer) {
                 // just store the variable where it can be accessed so we can manually trigger it
                 this.observer = observer;
                 return Subscriptions.empty();

rxjava-core/src/main/java/rx/operators/OperationConcat.java

@@ -255,7 +255,7 @@ public void testSimpleAsyncConcat() {
             TestObservable<String> o1 = new TestObservable<String>("one", "two", "three");
             TestObservable<String> o2 = new TestObservable<String>("four", "five", "six");
 
-            Observable.concat(o1, o2).subscribe(observer);
+            Observable.concat(Observable.create(o1), Observable.create(o2)).subscribe(observer);
 
             try {
                 // wait for async observables to complete
@@ -301,12 +301,12 @@ public void run() {
                                 // emit first
                                 if (!s.isUnsubscribed()) {
                                     System.out.println("Emit o1");
-                                    observer.onNext(o1);
+                                    observer.onNext(Observable.create(o1));
                                 }
                                 // emit second
                                 if (!s.isUnsubscribed()) {
                                     System.out.println("Emit o2");
-                                    observer.onNext(o2);
+                                    observer.onNext(Observable.create(o2));
                                 }
 
                                 // wait until sometime later and emit third
@@ -317,7 +317,7 @@ public void run() {
                                 }
                                 if (!s.isUnsubscribed()) {
                                     System.out.println("Emit o3");
-                                    observer.onNext(o3);
+                                    observer.onNext(Observable.create(o3));
                                 }
 
                             } catch (Throwable e) {
@@ -404,7 +404,7 @@ public void testBlockedObservableOfObservables() {
             final CountDownLatch callOnce = new CountDownLatch(1);
             final CountDownLatch okToContinue = new CountDownLatch(1);
             TestObservable<Observable<String>> observableOfObservables = new TestObservable<Observable<String>>(callOnce, okToContinue, odds, even);
-            OnSubscribeFunc<String> concatF = concat(observableOfObservables);
+            OnSubscribeFunc<String> concatF = concat(Observable.create(observableOfObservables));
             Observable<String> concat = Observable.create(concatF);
             concat.subscribe(observer);
             try {
@@ -443,8 +443,8 @@ public void testConcatConcurrentWithInfinity() {
             @SuppressWarnings("unchecked")
             Observer<String> aObserver = mock(Observer.class);
             @SuppressWarnings("unchecked")
-            TestObservable<Observable<String>> observableOfObservables = new TestObservable<Observable<String>>(w1, w2);
-            OnSubscribeFunc<String> concatF = concat(observableOfObservables);
+            TestObservable<Observable<String>> observableOfObservables = new TestObservable<Observable<String>>(Observable.create(w1), Observable.create(w2));
+            OnSubscribeFunc<String> concatF = concat(Observable.create(observableOfObservables));
 
             Observable<String> concat = Observable.create(concatF);
 
@@ -485,8 +485,8 @@ public void testConcatNonBlockingObservables() {
                 @Override
                 public Subscription onSubscribe(Observer<? super Observable<String>> observer) {
                     // simulate what would happen in an observable
-                    observer.onNext(w1);
-                    observer.onNext(w2);
+                    observer.onNext(Observable.create(w1));
+                    observer.onNext(Observable.create(w2));
                     observer.onCompleted();
 
                     return new Subscription() {
@@ -540,7 +540,7 @@ public void testConcatUnsubscribe() {
             @SuppressWarnings("unchecked")
             final Observer<String> aObserver = mock(Observer.class);
             @SuppressWarnings("unchecked")
-            final Observable<String> concat = Observable.create(concat(w1, w2));
+            final Observable<String> concat = Observable.create(concat(Observable.create(w1), Observable.create(w2)));
             final SafeObservableSubscription s1 = new SafeObservableSubscription();
 
             try {
@@ -583,8 +583,8 @@ public void testConcatUnsubscribeConcurrent() {
             @SuppressWarnings("unchecked")
             Observer<String> aObserver = mock(Observer.class);
             @SuppressWarnings("unchecked")
-            TestObservable<Observable<String>> observableOfObservables = new TestObservable<Observable<String>>(w1, w2);
-            OnSubscribeFunc<String> concatF = concat(observableOfObservables);
+            TestObservable<Observable<String>> observableOfObservables = new TestObservable<Observable<String>>(Observable.create(w1), Observable.create(w2));
+            OnSubscribeFunc<String> concatF = concat(Observable.create(observableOfObservables));
 
             Observable<String> concat = Observable.create(concatF);
 
@@ -616,7 +616,7 @@ public void testConcatUnsubscribeConcurrent() {
             verify(aObserver, never()).onError(any(Throwable.class));
         }
 
-        private static class TestObservable<T> extends Observable<T> {
+        private static class TestObservable<T> implements OnSubscribeFunc<T> {
 
             private final Subscription s = new Subscription() {
 
@@ -656,7 +656,7 @@ public TestObservable(T seed, int size) {
             }
 
             @Override
-            public Subscription subscribe(final Observer<? super T> observer) {
+            public Subscription onSubscribe(final Observer<? super T> observer) {
                 t = new Thread(new Runnable() {
 
                     @Override

rxjava-core/src/main/java/rx/operators/OperationMaterialize.java

@@ -93,7 +93,7 @@ public void testMaterialize1() {
             final TestAsyncErrorObservable o1 = new TestAsyncErrorObservable("one", "two", null, "three");
 
             TestObserver Observer = new TestObserver();
-            Observable<Notification<String>> m = Observable.create(materialize(o1));
+            Observable<Notification<String>> m = Observable.create(materialize(Observable.create(o1)));
             m.subscribe(Observer);
 
             try {
@@ -118,7 +118,7 @@ public void testMaterialize2() {
             final TestAsyncErrorObservable o1 = new TestAsyncErrorObservable("one", "two", "three");
 
             TestObserver Observer = new TestObserver();
-            Observable<Notification<String>> m = Observable.create(materialize(o1));
+            Observable<Notification<String>> m = Observable.create(materialize(Observable.create(o1)));
             m.subscribe(Observer);
 
             try {
@@ -143,7 +143,7 @@ public void testMaterialize2() {
         public void testMultipleSubscribes() throws InterruptedException, ExecutionException {
             final TestAsyncErrorObservable o = new TestAsyncErrorObservable("one", "two", null, "three");
 
-            Observable<Notification<String>> m = Observable.create(materialize(o));
+            Observable<Notification<String>> m = Observable.create(materialize(Observable.create(o)));
 
             assertEquals(3, m.toList().toBlockingObservable().toFuture().get().size());
             assertEquals(3, m.toList().toBlockingObservable().toFuture().get().size());
@@ -174,7 +174,7 @@ public void onNext(Notification<String> value) {
 
     }
 
-    private static class TestAsyncErrorObservable extends Observable<String> {
+    private static class TestAsyncErrorObservable implements OnSubscribeFunc<String> {
 
         String[] valuesToReturn;
 
@@ -185,7 +185,7 @@ private static class TestAsyncErrorObservable extends Observable<String> {
         volatile Thread t;
 
         @Override
-        public Subscription subscribe(final Observer<? super String> observer) {
+        public Subscription onSubscribe(final Observer<? super String> observer) {
             t = new Thread(new Runnable() {
 
                 @Override