2.x: Fix refCount() not resetting when cross-canceled (#6629)

* 2.x: Fix refCount() not resetting when cross-canceled

* Undo test timeout comment

Author: akarnokd

Diff for: src/main/java/io/reactivex/internal/operators/flowable/FlowableRefCount.java

@@ -115,22 +115,42 @@ void cancel(RefConnection rc) {
 
     void terminated(RefConnection rc) {
         synchronized (this) {
-            if (connection != null && connection == rc) {
-                connection = null;
-                if (rc.timer != null) {
-                    rc.timer.dispose();
+            if (source instanceof FlowablePublishClassic) {
+                if (connection != null && connection == rc) {
+                    connection = null;
+                    clearTimer(rc);
                 }
-            }
-            if (--rc.subscriberCount == 0) {
-                if (source instanceof Disposable) {
-                    ((Disposable)source).dispose();
-                } else if (source instanceof ResettableConnectable) {
-                    ((ResettableConnectable)source).resetIf(rc.get());
+
+                if (--rc.subscriberCount == 0) {
+                    reset(rc);
+                }
+            } else {
+                if (connection != null && connection == rc) {
+                    clearTimer(rc);
+                    if (--rc.subscriberCount == 0) {
+                        connection = null;
+                        reset(rc);
+                    }
                 }
             }
         }
     }
 
+    void clearTimer(RefConnection rc) {
+        if (rc.timer != null) {
+            rc.timer.dispose();
+            rc.timer = null;
+        }
+    }
+
+    void reset(RefConnection rc) {
+        if (source instanceof Disposable) {
+            ((Disposable)source).dispose();
+        } else if (source instanceof ResettableConnectable) {
+            ((ResettableConnectable)source).resetIf(rc.get());
+        }
+    }
+
     void timeout(RefConnection rc) {
         synchronized (this) {
             if (rc.subscriberCount == 0 && rc == connection) {

Diff for: src/main/java/io/reactivex/internal/operators/observable/ObservableRefCount.java

@@ -112,22 +112,42 @@ void cancel(RefConnection rc) {
 
     void terminated(RefConnection rc) {
         synchronized (this) {
-            if (connection != null && connection == rc) {
-                connection = null;
-                if (rc.timer != null) {
-                    rc.timer.dispose();
+            if (source instanceof ObservablePublishClassic) {
+                if (connection != null && connection == rc) {
+                    connection = null;
+                    clearTimer(rc);
                 }
-            }
-            if (--rc.subscriberCount == 0) {
-                if (source instanceof Disposable) {
-                    ((Disposable)source).dispose();
-                } else if (source instanceof ResettableConnectable) {
-                    ((ResettableConnectable)source).resetIf(rc.get());
+
+                if (--rc.subscriberCount == 0) {
+                    reset(rc);
+                }
+            } else {
+                if (connection != null && connection == rc) {
+                    clearTimer(rc);
+                    if (--rc.subscriberCount == 0) {
+                        connection = null;
+                        reset(rc);
+                    }
                 }
             }
         }
     }
 
+    void clearTimer(RefConnection rc) {
+        if (rc.timer != null) {
+            rc.timer.dispose();
+            rc.timer = null;
+        }
+    }
+
+    void reset(RefConnection rc) {
+        if (source instanceof Disposable) {
+            ((Disposable)source).dispose();
+        } else if (source instanceof ResettableConnectable) {
+            ((ResettableConnectable)source).resetIf(rc.get());
+        }
+    }
+
     void timeout(RefConnection rc) {
         synchronized (this) {
             if (rc.subscriberCount == 0 && rc == connection) {

Diff for: src/test/java/io/reactivex/internal/operators/flowable/FlowableRefCountAltTest.java

@@ -1443,4 +1443,23 @@ public void publishRefCountShallBeThreadSafe() {
             .assertComplete();
         }
     }
+
+    @Test
+    public void upstreamTerminationTriggersAnotherCancel() throws Exception {
+        ReplayProcessor<Integer> rp = ReplayProcessor.create();
+        rp.onNext(1);
+        rp.onComplete();
+
+        Flowable<Integer> shared = rp.share();
+
+        shared
+        .buffer(shared.debounce(5, TimeUnit.SECONDS))
+        .test()
+        .assertValueCount(2);
+
+        shared
+        .buffer(shared.debounce(5, TimeUnit.SECONDS))
+        .test()
+        .assertValueCount(2);
+    }
 }

Diff for: src/test/java/io/reactivex/internal/operators/flowable/FlowableRefCountTest.java

@@ -14,6 +14,7 @@
 package io.reactivex.internal.operators.flowable;
 
 import static org.junit.Assert.*;
+import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.*;
 
 import java.io.IOException;
@@ -1436,4 +1437,23 @@ public void disconnectBeforeConnect() {
 
         flowable.take(1).test().assertResult(2);
     }
+
+    @Test
+    public void upstreamTerminationTriggersAnotherCancel() throws Exception {
+        ReplayProcessor<Integer> rp = ReplayProcessor.create();
+        rp.onNext(1);
+        rp.onComplete();
+
+        Flowable<Integer> shared = rp.share();
+
+        shared
+        .buffer(shared.debounce(5, TimeUnit.SECONDS))
+        .test()
+        .assertValueCount(2);
+
+        shared
+        .buffer(shared.debounce(5, TimeUnit.SECONDS))
+        .test()
+        .assertValueCount(2);
+    }
 }

Diff for: src/test/java/io/reactivex/internal/operators/observable/ObservableRefCountAltTest.java

@@ -1399,4 +1399,23 @@ public void publishRefCountShallBeThreadSafe() {
             .assertComplete();
         }
     }
+
+    @Test
+    public void upstreamTerminationTriggersAnotherCancel() throws Exception {
+        ReplaySubject<Integer> rs = ReplaySubject.create();
+        rs.onNext(1);
+        rs.onComplete();
+
+        Observable<Integer> shared = rs.share();
+
+        shared
+        .buffer(shared.debounce(5, TimeUnit.SECONDS))
+        .test()
+        .assertValueCount(2);
+
+        shared
+        .buffer(shared.debounce(5, TimeUnit.SECONDS))
+        .test()
+        .assertValueCount(2);
+    }
 }

Diff for: src/test/java/io/reactivex/internal/operators/observable/ObservableRefCountTest.java

@@ -1380,4 +1380,23 @@ public void disconnectBeforeConnect() {
 
         observable.take(1).test().assertResult(2);
     }
+
+    @Test
+    public void upstreamTerminationTriggersAnotherCancel() throws Exception {
+        ReplaySubject<Integer> rs = ReplaySubject.create();
+        rs.onNext(1);
+        rs.onComplete();
+
+        Observable<Integer> shared = rs.share();
+
+        shared
+        .buffer(shared.debounce(5, TimeUnit.SECONDS))
+        .test()
+        .assertValueCount(2);
+
+        shared
+        .buffer(shared.debounce(5, TimeUnit.SECONDS))
+        .test()
+        .assertValueCount(2);
+    }
 }