From 0444fe2c504cd5d14370d56614bdf7cf74b9c669 Mon Sep 17 00:00:00 2001
From: Nikita Koksharov <nkoksharov@redisson.pro>
Date: Mon, 5 Nov 2018 14:20:02 +0300
Subject: [PATCH] RedissonTopicRx added

---
 .../java/org/redisson/rx/RedissonTopicRx.java | 80 +++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 redisson/src/main/java/org/redisson/rx/RedissonTopicRx.java

diff --git a/redisson/src/main/java/org/redisson/rx/RedissonTopicRx.java b/redisson/src/main/java/org/redisson/rx/RedissonTopicRx.java
new file mode 100644
index 000000000..95a807227
--- /dev/null
+++ b/redisson/src/main/java/org/redisson/rx/RedissonTopicRx.java
@@ -0,0 +1,80 @@
+/**
+ * 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 org.redisson.api.RFuture;
+import org.redisson.api.RTopic;
+import org.redisson.api.listener.MessageListener;
+
+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
+ *
+ */
+public class RedissonTopicRx {
+
+    private final RTopic topic;
+    
+    public RedissonTopicRx(RTopic topic) {
+        this.topic = topic;
+    }
+
+    public <M> Flowable<M> getMessages(final Class<M> type) {
+        final ReplayProcessor<M> p = ReplayProcessor.create();
+        return p.doOnRequest(new LongConsumer() {
+            @Override
+            public void accept(long n) throws Exception {
+                final AtomicLong counter = new AtomicLong(n);
+                RFuture<Integer> t = topic.addListenerAsync(type, new MessageListener<M>() {
+                    @Override
+                    public void onMessage(CharSequence channel, M msg) {
+                        p.onNext(msg);
+                        if (counter.decrementAndGet() == 0) {
+                            topic.removeListenerAsync(this);
+                            p.onComplete();
+                        }
+                    }
+                });
+                t.addListener(new FutureListener<Integer>() {
+                    @Override
+                    public void operationComplete(Future<Integer> future) throws Exception {
+                        if (!future.isSuccess()) {
+                            return;
+                        }
+                        
+                        final Integer id = future.getNow();
+                        p.doOnCancel(new Action() {
+                            @Override
+                            public void run() throws Exception {
+                                topic.removeListenerAsync(id);
+                            }
+                        });
+                    }
+                });
+            }
+        });
+    }
+    
+}