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There is certainly no denying that Starling is a remarkably easy-to-use distributed message queue That is why it has been so prominent in the Ruby community for several years It is fast and effective If Starling has a downside, it is that you have to constantly poll it to find out if any new messages need processing Systems such as RabbitMQ allow you to subscribe to a queue that notifies you when a message is available for processing We will talk about RabbitMQ in 8, AMQP/RabbitMQ In addition to lacking a subscription/callback system, Starling lacks a few other nice-to-have features But the lack of those features certainly does not stop Starling from being a great tool to add to your arsenal, especially if you want quick setup and ease of use
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Endnotes
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1 http://githubcom/starling/starling/tree/master 2 http://wwwdangacom/memcached/ 3 http://wwwyamlorg/ 4 This is not entirely accurate The set method actually takes four parameters The third parameter is how long, in seconds, you want the object to live By default this is 0, meaning it will live forever The last parameter is called raw By default this value is false When it is set to false, the object is marshaled before being placed into Memcached If it is set to true, the object is not marshaled There is a third variation on this If you set the raw parameter to :yaml, the object is dumped to YAML before being sent to Memcached This is useful if you plan on using other languages in addition to Ruby to access your queues
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C HAPTER 8 AMQP/RabbitMQ
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In the preceding chapter on Starling, you learned about distributed message queues and how and when they can be advantageous to use I also said that Starling has been a mainstay in the Ruby community for several years Recently a new contender to the throne has arisen: RabbitMQ1 Here is what the developers of RabbitMQ have to say about it: RabbitMQ is a complete and highly reliable Enterprise Messaging system The RabbitMQ client libraries and broker daemon can be used together to create an AMQP network, or used individually to bring the benefits of RabbitMQ to established networks In short, they are saying that it is a distributed messaging queue, not too dissimilar from Starling, but it implements the AMQP2 protocol instead of the Memcached protocol that Starling implemented It allows implementations of a few other interesting architectural designs that can prove to be useful in the world of distributed programming
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What Is AMQP
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AMQP stands for Advanced Message Queuing Protocol AMQP is being designed as a common queuing protocol for enterprise systems to use The protocol was designed by Cisco, Microsoft, Novell, and Red Hat, to name just a few The goal of the project
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8 AMQP/RabbitMQ
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is to have a stable, fast, and reliable system that can be run on multiple environments and that is accessible from any language The AMQP website answers the questions of why and what quite nicely: Though many networking protocol needs have been addressed, a large gap exists in common guaranteed-delivery messaging middleware AMQP fills that gap AMQP enables complete interoperability for messaging middleware; both the networking protocol and the semantics of broker services are defined in AMQP When working with an AMQP-compatible server, you should be aware of three main parts The first is the exchange, which inspects the incoming message and finds the appropriate binding for it The binding tells the exchange which message queue the message should be delivered to Figure 8-1 shows this interaction
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Binding
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Message Queue
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Figure 8-1
The typical flow of an AMQP-compatible server
Installation
To help clarify what these different parts of the server do, the team developing AMQP use the example of an email system This metaphor is quite nice and easy to understand: A message is analogous to an email message A message queue is similar to that of an email mailbox for a particular email address The exchange acts in much the same way that a mail transfer agent (MTA) would It inspects the message and decides, based on routing keys and tables, to which message queue the message should be delivered This is similar to how an MTA inspects the email and decides to which email mailbox it should be delivered based on things like the To: and Cc: address A routing key is much like an email address attached to an email It is important to note that domain information, like in an email address, is unnecessary, because all routing is done entirely internal to an AMQP server A binding is like an entry in an MTA routing table Because this is just a high-level introduction to idea of the AMQP, I won t go into much more detail If you are interested in knowing about the fundamentals of AMQP, I strongly encourage you to read the great specifications document posted on the AMQP site It goes into much detail about the inner workings of the AMQP protocol to a level that isn t covered in this book