RedissonBlockingQueueRx added

redisson/src/main/java/org/redisson/rx/RedissonBlockingQueueRx.java

@@ -0,0 +1,84 @@
+/**
+ * Copyright 2018 Nikita Koksharov
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.redisson.rx;
+
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.concurrent.atomic.AtomicReference;
+
+import org.redisson.RedissonBlockingQueue;
+import org.redisson.api.RFuture;
+
+import io.netty.util.concurrent.Future;
+import io.netty.util.concurrent.FutureListener;
+import io.reactivex.Flowable;
+import io.reactivex.functions.Action;
+import io.reactivex.functions.LongConsumer;
+import io.reactivex.processors.ReplayProcessor;
+
+/**
+ * 
+ * @author Nikita Koksharov
+ *
+ * @param <V> - value type
+ */
+public class RedissonBlockingQueueRx<V> extends RedissonListRx<V> {
+
+    private final RedissonBlockingQueue<V> queue;
+    
+    public RedissonBlockingQueueRx(RedissonBlockingQueue<V> queue) {
+        super(queue);
+        this.queue = queue;
+    }
+
+    public Flowable<V> takeElements() {
+        final ReplayProcessor<V> p = ReplayProcessor.create();
+        return p.doOnRequest(new LongConsumer() {
+            @Override
+            public void accept(long n) throws Exception {
+                final AtomicLong counter = new AtomicLong(n);
+                final AtomicReference<RFuture<V>> futureRef = new AtomicReference<RFuture<V>>();
+                take(p, counter, futureRef);
+                p.doOnCancel(new Action() {
+                    @Override
+                    public void run() throws Exception {
+                        futureRef.get().cancel(true);
+                    }
+                });
+            }
+        });
+    }
+    
+    private void take(final ReplayProcessor<V> p, final AtomicLong counter, final AtomicReference<RFuture<V>> futureRef) {
+        RFuture<V> future = queue.takeAsync();
+        futureRef.set(future);
+        future.addListener(new FutureListener<V>() {
+            @Override
+            public void operationComplete(Future<V> future) throws Exception {
+                if (!future.isSuccess()) {
+                    p.onError(future.cause());
+                    return;
+                }
+                
+                p.onNext(future.getNow());
+                if (counter.decrementAndGet() == 0) {
+                    p.onComplete();
+                }
+                
+                take(p, counter, futureRef);
+            }
+        });
+    }
+}