Performance optimizations for dynamic function execution.

- memoize dynamic function constructions so executions are statically typed after a single dynamic lookup instead of dynamic on every execution

Author: benjchristensen

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

@@ -52,6 +52,7 @@
 import rx.util.Func2;
 import rx.util.Func3;
 import rx.util.Func4;
+import rx.util.FuncN;
 import rx.util.Functions;
 
 /**
@@ -301,7 +302,7 @@ private static void handleError(Exception e) {
      * @param args
      */
     private void executeCallback(final Object callback, Object... args) {
-        Functions.execute(callback, args);
+        Functions.from(callback).call(args);
     }
 
     /**
@@ -395,11 +396,13 @@ public static <T> Observable<T> create(Func1<Observer<T>, Subscription> func) {
      * @return a Observable that, when a Observer subscribes to it, will execute the given function
      */
     public static <T> Observable<T> create(final Object callback) {
+        @SuppressWarnings("rawtypes")
+        final FuncN _f = Functions.from(callback);
         return create(new Func1<Observer<T>, Subscription>() {
 
             @Override
             public Subscription call(Observer<T> t1) {
-                return Functions.execute(callback, t1);
+                return (Subscription) _f.call(t1);
             }
 
         });
@@ -469,11 +472,13 @@ public static <T> Observable<T> filter(Observable<T> that, Func1<T, Boolean> pre
      *         evaluates as true
      */
     public static <T> Observable<T> filter(Observable<T> that, final Object function) {
+        @SuppressWarnings("rawtypes")
+        final FuncN _f = Functions.from(function);
         return filter(that, new Func1<T, Boolean>() {
 
             @Override
             public Boolean call(T t1) {
-                return Functions.execute(function, t1);
+                return (Boolean) _f.call(t1);
 
             }
 
@@ -597,11 +602,14 @@ public static <T, R> Observable<R> map(Observable<T> sequence, Func1<T, R> func)
      *         in the sequence emitted by the source Observable
      */
     public static <T, R> Observable<R> map(Observable<T> sequence, final Object function) {
+        @SuppressWarnings("rawtypes")
+        final FuncN _f = Functions.from(function);
         return map(sequence, new Func1<T, R>() {
 
+            @SuppressWarnings("unchecked")
             @Override
             public R call(T t1) {
-                return Functions.execute(function, t1);
+                return (R) _f.call(t1);
             }
 
         });
@@ -656,11 +664,14 @@ public static <T, R> Observable<R> mapMany(Observable<T> sequence, Func1<T, Obse
      *         Observables obtained from this transformation
      */
     public static <T, R> Observable<R> mapMany(Observable<T> sequence, final Object function) {
+        @SuppressWarnings("rawtypes")
+        final FuncN _f = Functions.from(function);
         return mapMany(sequence, new Func1<T, R>() {
 
+            @SuppressWarnings("unchecked")
             @Override
             public R call(T t1) {
-                return Functions.execute(function, t1);
+                return (R) _f.call(t1);
             }
 
         });
@@ -876,11 +887,14 @@ public static <T> Observable<T> onErrorResumeNext(final Observable<T> that, fina
      * @return the source Observable, with its behavior modified as described
      */
     public static <T> Observable<T> onErrorResumeNext(final Observable<T> that, final Object resumeFunction) {
+        @SuppressWarnings("rawtypes")
+        final FuncN _f = Functions.from(resumeFunction);
         return onErrorResumeNext(that, new Func1<Exception, Observable<T>>() {
 
+            @SuppressWarnings("unchecked")
             @Override
             public Observable<T> call(Exception e) {
-                return Functions.execute(resumeFunction, e);
+                return (Observable<T>) _f.call(e);
             }
         });
     }
@@ -999,11 +1013,14 @@ public static <T> Observable<T> reduce(Observable<T> sequence, Func2<T, T, T> ac
      * @see <a href="http://en.wikipedia.org/wiki/Fold_(higher-order_function)">Wikipedia: Fold (higher-order function)</a>
      */
     public static <T> Observable<T> reduce(final Observable<T> sequence, final Object accumulator) {
+        @SuppressWarnings("rawtypes")
+        final FuncN _f = Functions.from(accumulator);
         return reduce(sequence, new Func2<T, T, T>() {
 
+            @SuppressWarnings("unchecked")
             @Override
             public T call(T t1, T t2) {
-                return Functions.execute(accumulator, t1, t2);
+                return (T) _f.call(t1, t2);
             }
 
         });
@@ -1071,11 +1088,14 @@ public static <T> Observable<T> reduce(Observable<T> sequence, T initialValue, F
      * @see <a href="http://en.wikipedia.org/wiki/Fold_(higher-order_function)">Wikipedia: Fold (higher-order function)</a>
      */
     public static <T> Observable<T> reduce(final Observable<T> sequence, final T initialValue, final Object accumulator) {
+        @SuppressWarnings("rawtypes")
+        final FuncN _f = Functions.from(accumulator);
         return reduce(sequence, initialValue, new Func2<T, T, T>() {
 
+            @SuppressWarnings("unchecked")
             @Override
             public T call(T t1, T t2) {
-                return Functions.execute(accumulator, t1, t2);
+                return (T) _f.call(t1, t2);
             }
 
         });
@@ -1126,11 +1146,14 @@ public static <T> Observable<T> scan(Observable<T> sequence, Func2<T, T, T> accu
      * @see <a href="http://msdn.microsoft.com/en-us/library/hh211665(v%3Dvs.103).aspx">MSDN: Observable.Scan</a>
      */
     public static <T> Observable<T> scan(final Observable<T> sequence, final Object accumulator) {
+        @SuppressWarnings("rawtypes")
+        final FuncN _f = Functions.from(accumulator);
         return scan(sequence, new Func2<T, T, T>() {
 
+            @SuppressWarnings("unchecked")
             @Override
             public T call(T t1, T t2) {
-                return Functions.execute(accumulator, t1, t2);
+                return (T) _f.call(t1, t2);
             }
 
         });
@@ -1185,11 +1208,14 @@ public static <T> Observable<T> scan(Observable<T> sequence, T initialValue, Fun
      * @see <a href="http://msdn.microsoft.com/en-us/library/hh211665(v%3Dvs.103).aspx">MSDN: Observable.Scan</a>
      */
     public static <T> Observable<T> scan(final Observable<T> sequence, final T initialValue, final Object accumulator) {
+        @SuppressWarnings("rawtypes")
+        final FuncN _f = Functions.from(accumulator);
         return scan(sequence, initialValue, new Func2<T, T, T>() {
 
+            @SuppressWarnings("unchecked")
             @Override
             public T call(T t1, T t2) {
-                return Functions.execute(accumulator, t1, t2);
+                return (T) _f.call(t1, t2);
             }
 
         });
@@ -1359,11 +1385,13 @@ public static <T> Observable<List<T>> toSortedList(Observable<T> sequence, Func2
      * @return
      */
     public static <T> Observable<List<T>> toSortedList(Observable<T> sequence, final Object sortFunction) {
+        @SuppressWarnings("rawtypes")
+        final FuncN _f = Functions.from(sortFunction);
         return OperationToObservableSortedList.toSortedList(sequence, new Func2<T, T, Integer>() {
 
             @Override
             public Integer call(T t1, T t2) {
-                return Functions.execute(sortFunction, t1, t2);
+                return (Integer) _f.call(t1, t2);
             }
 
         });
@@ -1422,11 +1450,14 @@ public static <R, T0, T1> Observable<R> zip(Observable<T0> w0, Observable<T1> w1
      * @return a Observable that emits the zipped results
      */
     public static <R, T0, T1> Observable<R> zip(Observable<T0> w0, Observable<T1> w1, final Object function) {
+        @SuppressWarnings("rawtypes")
+        final FuncN _f = Functions.from(function);
         return zip(w0, w1, new Func2<T0, T1, R>() {
 
+            @SuppressWarnings("unchecked")
             @Override
             public R call(T0 t0, T1 t1) {
-                return Functions.execute(function, t0, t1);
+                return (R) _f.call(t0, t1);
             }
 
         });
@@ -1493,11 +1524,14 @@ public static <R, T0, T1, T2> Observable<R> zip(Observable<T0> w0, Observable<T1
      * @return a Observable that emits the zipped results
      */
     public static <R, T0, T1, T2> Observable<R> zip(Observable<T0> w0, Observable<T1> w1, Observable<T2> w2, final Object function) {
+        @SuppressWarnings("rawtypes")
+        final FuncN _f = Functions.from(function);
         return zip(w0, w1, w2, new Func3<T0, T1, T2, R>() {
 
+            @SuppressWarnings("unchecked")
             @Override
             public R call(T0 t0, T1 t1, T2 t2) {
-                return Functions.execute(function, t0, t1, t2);
+                return (R) _f.call(t0, t1, t2);
             }
 
         });
@@ -1566,11 +1600,14 @@ public static <R, T0, T1, T2, T3> Observable<R> zip(Observable<T0> w0, Observabl
      * @return a Observable that emits the zipped results
      */
     public static <R, T0, T1, T2, T3> Observable<R> zip(Observable<T0> w0, Observable<T1> w1, Observable<T2> w2, Observable<T3> w3, final Object function) {
+        @SuppressWarnings("rawtypes")
+        final FuncN _f = Functions.from(function);
         return zip(w0, w1, w2, w3, new Func4<T0, T1, T2, T3, R>() {
 
+            @SuppressWarnings("unchecked")
             @Override
             public R call(T0 t0, T1 t1, T2 t2, T3 t3) {
-                return Functions.execute(function, t0, t1, t2, t3);
+                return (R) _f.call(t0, t1, t2, t3);
             }
 
         });
@@ -1588,7 +1625,7 @@ public R call(T0 t0, T1 t1, T2 t2, T3 t3) {
      * @return a Observable that emits only those items in the original Observable that the filter
      *         evaluates as <code>true</code>
      */
-    public Observable<T> filter(Func1<Boolean, T> predicate) {
+    public Observable<T> filter(Func1<T, Boolean> predicate) {
         return filter(this, predicate);
     }
 
@@ -1605,10 +1642,12 @@ public Observable<T> filter(Func1<Boolean, T> predicate) {
      *         evaluates as "true"
      */
     public Observable<T> filter(final Object callback) {
+        @SuppressWarnings("rawtypes")
+        final FuncN _f = Functions.from(callback);
         return filter(this, new Func1<T, Boolean>() {
 
             public Boolean call(T t1) {
-                return Functions.execute(callback, t1);
+                return (Boolean) _f.call(t1);
             }
         });
     }
@@ -1638,7 +1677,7 @@ public Observable<T> last() {
      * @return a Observable that emits a sequence that is the result of applying the transformation
      *         closure to each item in the sequence emitted by the input Observable.
      */
-    public <R> Observable<R> map(Func1<R, T> func) {
+    public <R> Observable<R> map(Func1<T, R> func) {
         return map(this, func);
     }
 
@@ -1655,10 +1694,13 @@ public <R> Observable<R> map(Func1<R, T> func) {
      *         closure to each item in the sequence emitted by the input Observable.
      */
     public <R> Observable<R> map(final Object callback) {
+        @SuppressWarnings("rawtypes")
+        final FuncN _f = Functions.from(callback);
         return map(this, new Func1<T, R>() {
 
+            @SuppressWarnings("unchecked")
             public R call(T t1) {
-                return Functions.execute(callback, t1);
+                return (R) _f.call(t1);
             }
         });
     }
@@ -1698,10 +1740,13 @@ public <R> Observable<R> mapMany(Func1<T, Observable<R>> func) {
      *         Observables obtained from this transformation.
      */
     public <R> Observable<R> mapMany(final Object callback) {
+        @SuppressWarnings("rawtypes")
+        final FuncN _f = Functions.from(callback);
         return mapMany(this, new Func1<T, Observable<R>>() {
 
+            @SuppressWarnings("unchecked")
             public Observable<R> call(T t1) {
-                return Functions.execute(callback, t1);
+                return (Observable<R>) _f.call(t1);
             }
         });
     }
@@ -1771,10 +1816,13 @@ public Observable<T> onErrorResumeNext(final Func1<Exception, Observable<T>> res
      * @return the original Observable with appropriately modified behavior
      */
     public Observable<T> onErrorResumeNext(final Object resumeFunction) {
+        @SuppressWarnings("rawtypes")
+        final FuncN _f = Functions.from(resumeFunction);
         return onErrorResumeNext(this, new Func1<Exception, Observable<T>>() {
 
+            @SuppressWarnings("unchecked")
             public Observable<T> call(Exception e) {
-                return Functions.execute(resumeFunction, e);
+                return (Observable<T>) _f.call(e);
             }
         });
     }
@@ -1857,10 +1905,13 @@ public Observable<T> onErrorReturn(Func1<Exception, T> resumeFunction) {
      * @return the original Observable with appropriately modified behavior
      */
     public Observable<T> onErrorReturn(final Object resumeFunction) {
+        @SuppressWarnings("rawtypes")
+        final FuncN _f = Functions.from(resumeFunction);
         return onErrorReturn(this, new Func1<Exception, T>() {
 
+            @SuppressWarnings("unchecked")
             public T call(Exception e) {
-                return Functions.execute(resumeFunction, e);
+                return (T) _f.call(e);
             }
         });
     }

rxjava-core/src/main/java/rx/observables/operations/AtomicObserver.java

@@ -47,7 +47,7 @@
 /* package */final class AtomicObserver<T> implements Observer<T> {
 
     /** Allow changing between forcing single or allowing multi-threaded execution of onNext */
-    private static boolean allowMultiThreaded = true;
+    private static boolean allowMultiThreaded = false;
     static {
         String v = System.getProperty("rx.onNext.multithreaded.enabled");
         if (v != null) {

rxjava-core/src/main/java/rx/util/Action0.java

@@ -15,6 +15,6 @@
  */
 package rx.util;
 
-public interface Action0 {
+public interface Action0 extends Function {
     public void call();
 }

rxjava-core/src/main/java/rx/util/Action1.java

@@ -15,6 +15,6 @@
  */
 package rx.util;
 
-public interface Action1<T1> {
+public interface Action1<T1> extends Function {
     public void call(T1 t1);
 }

rxjava-core/src/main/java/rx/util/Action2.java

@@ -15,6 +15,6 @@
  */
 package rx.util;
 
-public interface Action2<T1, T2> {
+public interface Action2<T1, T2> extends Function {
     public void call(T1 t1, T2 t2);
 }

rxjava-core/src/main/java/rx/util/Action3.java

@@ -15,6 +15,6 @@
  */
 package rx.util;
 
-public interface Action3<T1, T2, T3> {
+public interface Action3<T1, T2, T3> extends Function {
     public void call(T1 t1, T2 t2, T3 t3);
 }

rxjava-core/src/main/java/rx/util/Func0.java

@@ -15,6 +15,6 @@
  */
 package rx.util;
 
-public interface Func0<R> {
+public interface Func0<R> extends Function {
     public R call();
 }

rxjava-core/src/main/java/rx/util/Func1.java

@@ -15,6 +15,6 @@
  */
 package rx.util;
 
-public interface Func1<T1, R> {
+public interface Func1<T1, R> extends Function {
     public R call(T1 t1);
 }

rxjava-core/src/main/java/rx/util/Func2.java

@@ -15,6 +15,6 @@
  */
 package rx.util;
 
-public interface Func2<T1, T2, R> {
+public interface Func2<T1, T2, R> extends Function {
     public R call(T1 t1, T2 t2);
 }

rxjava-core/src/main/java/rx/util/Func3.java

@@ -15,6 +15,6 @@
  */
 package rx.util;
 
-public interface Func3<T1, T2, T3, R> {
+public interface Func3<T1, T2, T3, R> extends Function {
     public R call(T1 t1, T2 t2, T3 t3);
 }