Properly handle unsubscriptions and close our PathChildrenCache object out

src/main/java/com/github/reiseburo/rx/curator/PathChildren.java

@@ -6,6 +6,9 @@ import org.apache.curator.framework.recipes.cache.PathChildrenCacheEvent;
 import org.apache.curator.framework.recipes.cache.PathChildrenCacheListener;
 import rx.Observable;
 import rx.Subscriber;
+import rx.functions.Action0;
+
+import java.io.IOException;
 
 /**
  * PathChildren is an {@code Observable} which takes events from a {@code PathChildrenCache}
@@ -49,8 +52,7 @@ public class PathChildren {
                 cache = new PathChildrenCache(curatorFramework, znodePath, true);
                 try {
                     cache.start(PathChildrenCache.StartMode.POST_INITIALIZED_EVENT);
-                }
-                catch (Exception ex) {
+                } catch (Exception ex) {
                     subscriber.onError(ex);
                 }
 
@@ -61,6 +63,19 @@ public class PathChildren {
                     }
                 });
             }
+        }).doOnUnsubscribe(new Action0() {
+            @Override
+            public void call() {
+                /* properly close out our cache object when our subscriber leaves */
+                if (cache instanceof PathChildrenCache) {
+                    try {
+                        cache.close();
+                    } catch (IOException exception) {
+                        /* Swallow, we don't need this exception */
+                    }
+                }
+
+            }
         });
     }
 }

src/test/groovy/com/github/reiseburo/rx/curator/PathChildrenSpec.groovy

@@ -58,12 +58,14 @@ class PathChildrenIntegrationSpec extends Specification {
     def "an initialization event should be received"() {
         given:
         boolean received = false
+        Subscription subscription
         Observable<PathChildrenCacheEvent> observable = PathChildren.with(curator).watch('/')
 
         when:
-        observable.subscribe { PathChildrenCacheEvent ev ->
+        subscription = observable.subscribe { PathChildrenCacheEvent ev ->
             if (ev.type == PathChildrenCacheEvent.Type.INITIALIZED) {
                 received = true
+                subscription.unsubscribe()
             }
         }