Add pub/sub example.

example_pub_sub.js

@@ -0,0 +1,33 @@
+var redis = require("redis"),
+    client1 = redis.createClient(), msg_count = 0,
+    client2 = redis.createClient();
+
+redis.debug_mode = false;
+
+client1.on("subscribe", function (channel, count) {
+    console.log("client1 subscribed to " + channel + ", " + count + " total subscriptions");
+    if (count === 2) {
+        client2.publish("a nice channel", "I am sending a message.");
+        client2.publish("another one", "I am sending a second message.");
+        client2.publish("a nice channel", "I am sending my last message.");
+    }
+});
+
+client1.on("unsubscribe", function (channel, count) {
+    console.log("client1 unsubscribed from " + channel + ", " + count + " total subscriptions");
+    if (count === 0) {
+        client2.end();
+        client1.end();
+    }
+});
+
+client1.on("message", function (channel, message) {
+    console.log("client1 channel " + channel + ": " + message);
+    msg_count += 1;
+    if (msg_count === 3) {
+        client1.unsubscribe();
+    }
+});
+
+client1.incr("did a thing");
+client1.subscribe("a nice channel", "another one");