{"id":21144,"date":"2014-01-30T10:00:07","date_gmt":"2014-01-30T08:00:07","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/?p=21144"},"modified":"2014-01-29T08:22:55","modified_gmt":"2014-01-29T06:22:55","slug":"simple-message-queue-using-redis","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2014\/01\/simple-message-queue-using-redis.html","title":{"rendered":"Simple Message Queue using Redis"},"content":{"rendered":"

In this posts we will use Redis as a simple message queue, using list commands.<\/p>\n

Let\u2019s say we have an application that allows the users to upload a photo. Then in the application we display the photo in different sizes like Thumb, Medium and Large.<\/p>\n

In a first implementation we could have the task of processing the uploaded image in the same request. As it is an expensive task, it would make our requests slow.<\/p>\n

A possible solution for this it to make this processing asynchronous by using a Message Queue(MQ), there are a lot of well known MQs like ActiveMQ, RabbitMQ, IBM MQ and other. In the examples below we will be using Redis as a message queue using the LIST structure.<\/p>\n

The idea is to have a LIST where the producer will put the messages to be processed and some consumers that will watch the LIST to process the messages sent.<\/p>\n

Basically, the producers will add the messages into the end of the list with \u201cRPUSH queue message<\/em>\u201d and the consumers will read the messages in the beginning of the list with \u201cLPOP queue<\/em>\u201d configuring a FIFO processing.<\/p>\n

The client will always be looking for a new message, for this purpose we will use the BLPOP command that is a blocking version of the LPOP command. Basically there will be a while loop calling BLPOP to get a new message to process.<\/p>\n

Considering the image upload example, let\u2019s say we have a class ImageUploader that is responsible for uploading the image to the server, it will add a new message in the queue, indicating there is an image to be processed, a message could be a JSON string like this:<\/p>\n

{\u201cimagePath\u201d:\u201d\/path\/to\/image\u201d, \u201cuser\u201d:\u201duserid\u201d}<\/pre>\n
The ImageUploder class could be like this:
 
<\/div> <\/div><\/p>\n
public class ImageUploader {\r\n\r\n  public void uploadImage(HttpServletRequest request){\r\n\r\n    String imagePath = saveImage(request);\r\n    String jsonPayload = createJsonPayload(request, imagePath);\r\n    jedis.rpush(\"queue\", jsonPayload);\r\n    \/\/... keep with the processing\r\n  }\r\n\r\n  \/\/.... other methods in the class\r\n}<\/pre>\n
It is just an example on how the producer would work. In this case we have decoupled the image processing from the ImageUploader class. We just create a new message in the queue, so the consumers would process them.<\/p>\n
The message consumer could be something like this:<\/p>\n
package br.com.xicojunior.redistest;\r\n\r\nimport java.util.List;\r\n\r\nimport redis.clients.jedis.Jedis;\r\n\r\npublic class MessageConsumer \r\n{\r\n    public static void main( String[] args )\r\n    {\r\n        Jedis jedis = new Jedis(\"localhost\");   \r\n        List<String> messages = null;\r\n        while(true){\r\n          System.out.println(\"Waiting for a message in the queue\");\r\n          messages = jedis.blpop(0,\"queue\");\r\n          System.out.println(\"Got the message\");\r\n          System.out.println(\"KEY:\" + messages.get(0) + \" VALUE:\" + messages.get(1));\r\n          String payload = messages.get(1);\r\n          \/\/Do some processing with the payload\r\n          System.out.println(\"Message received:\" + payload);\r\n        }\r\n\r\n    }\r\n}<\/pre>\n
This consumer code could be running in a different process or even a different machine. This consumers code is runnable we can compile it and run it using eclipse or java command.<\/p>\n
For this code we used the jedis.blpop<\/em> method, it returns a List with 2 Strings, (0) \u2013 The key, (1) \u2013 The value that was returned. The method also receives an integer, it indicates the timeout. We passed 0 indicating there will be no timeout.<\/p>\n
When we run this code and there is no value in the list, in the console we will see just the message<\/p>\n
\"Waiting for a message in the queue\".<\/pre>\n
Then if a client adds a element in the list \u201cqueue\u201d our consumer class will get its value. We can simulate a test by using the redis-cli or even another class that will add elements in the queue like the one below:<\/p>\n
package br.com.xicojunior.redistest;\r\n\r\nimport redis.clients.jedis.Jedis;\r\n\r\npublic class MessageProducer {\r\n\r\n  public static void main(String[] args) {\r\n    Jedis jedis = new Jedis(\"localhost\");\r\n\r\n    jedis.rpush(\"queue\", \"Value 1\");\r\n    jedis.rpush(\"queue\", \"Value 2\");\r\n    jedis.rpush(\"queue\", \"Value 3\");\r\n\r\n  }\r\n\r\n}<\/pre>\n
If we run the MessageProducer class after the MessageConsumer class is already running we will see this output in the console:<\/p>\n
Waiting for a message in the queue\r\nGot the message\r\nKEY:queue VALUE:Value 1\r\nMessage received:Value 1\r\nWaiting for a message in the queue\r\nGot the message\r\nKEY:queue VALUE:Value 2\r\nMessage received:Value 2\r\nWaiting for a message in the queue\r\nGot the message\r\nKEY:queue VALUE:Value 3\r\nMessage received:Value 3\r\nWaiting for a message in the queue<\/pre>\n
So, message queue would be another possible use case for Redis. There are some queues built on top of redis like RestMQ<\/a>, Resque<\/a> \u2013 a Job Queue and other.
\n <\/p>\n
Reference: <\/i><\/b>Simple Message Queue using Redis<\/a> from our JCG partner<\/a> Francisco Ribeiro Junior at the XICO JUNIOR’S WEBLOG<\/a> blog.<\/div>\n","protected":false},"excerpt":{"rendered":"
In this posts we will use Redis as a simple message queue, using list commands. Let\u2019s say we have an application that allows the users to upload a photo. Then in the application we display the photo in different sizes like Thumb, Medium and Large. In a first implementation we could have the task of …<\/p>\n","protected":false},"author":504,"featured_media":223,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[117],"class_list":["post-21144","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-redis"],"yoast_head":"\nCan you Learn and Improve without Agile Retrospectives? Of course you can...<\/title>\n<meta name=\"description\" content=\"In this posts we will use Redis as a simple message queue, using list commands. 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