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Post a Comment. Tuesday, April 17, Introducing DCell: Celluloid is an actor library I wrote for Ruby which exposes concurrent Ruby objects that "quack" just like any other Ruby object. DCell takes the asynchronous messaging protocol from Celluloid and exposes it to distributed networks of Ruby interpreters by marshaling Celluloid's messages as strings and sending them to other nodes over 0MQ.
Before I talk about DCell I'd like to talk a little bit about the history behind distributed objects in general and the ideas that DCell draws upon. A Brief History of Distributed Objects. Erlang uses this method within individual VMs as the basis of its concurrency model. Erlang actors a. However, Erlang also supports distribution using the exact same primitives it uses for concurrency.
It doesn't matter which type of actor you're talking to in Erlang, they "quack" the same, and thus Erlang has you model your problem in a way that provides both concurrency and distribution using the same abstraction. Distributed Erlang offers several features aimed at building robust distributed systems. The underlying messaging protocol is asynchronous , allowing many more messaging patterns than traditional RPC systems e.
In addition, Erlang processes can link to each other and receive events whenever a remote actor exits i. This allows you to build robust systems that can detect errors and take action accordingly. Erlang emphasizes a "fail early" philosophy where actors are encouraged not to try to handle errors but instead crash and restart in a clean state.
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Linking allows groups of interdependent actors to be taken down en masse, with all of them restarting in a clean state afterward. Exit events can also be handled, which is useful in distributed system for things like leader election.
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DCell provides all of these features. When you create an actor with Celluloid, a proxy object to the actor is returned. This proxy lets you use the method protocol to communicate with an actor using messages. Unlike DRb, DCell also exposes asynchronous behaviors, such as executing method calls in the background, and also using futures to schedule method invocation in advance then waiting for the result later.
DCell also lets distributed actors to link to each other and be informed when a remote actor terminates. It's been seen in many other distributed actor frameworks, including the Akka framework in Scala and the Jobim framework in Clojure.
Bringing Erlang's ideas over to Ruby. I have a long history of projects that try to cross-pollenate Ruby and Erlang. My first attempt was Revactor , my previous attempt at an actor library which provided a very raw and low-level API which is almost identical to the Rubinius Actor API. Revactor modeled each actor as a Fiber and thus provided no true concurrency. Another of my projects, Reia , tried to bring a more friendly syntax and OO semantics to Erlang. With Celluloid I've come full circle, trying to implement Erlang's ideas on Ruby again. Only this time, Celluloid makes working with actors easy and intuitive by embracing the uniform access principle and allowing you to build concurrent systems that you can talk to just like any other Ruby object.
Celluloid also provides asynchronous calls what Erlang would call a "cast" where a method is invoked on the receiver but the caller doesn't wait for a response. In addition to that Celluloid provides futures, which allow you to kick off a method on a remote actor and obtain the value returned from the call at some point in the future. In addition Celluloid embraces many of Erlang's ideas about fault tolerance, including a "crash early" philosophy. Celluloid lets you link groups of interdependent actors together so if any one fails you can crash an entire group.
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Supervisors and supervision trees automatically restart actors in a clean state whenever they crash. Celluloid does all of this using an asynchronous message protocol. Actors communicate with other actors by sending asynchronous messages. A message might say an actor has crashed, or another actor is requesting a method should be invoked, or that a method invocation is complete and the response is a given value.
All of the heavy lifting for building robust, fault-tolerant systems is baked into Celluloid. When programs are factored this way, adding distribution is easy.
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DCell takes the existing primitives Celluloid has built up for building concurrent programs and exposes them onto the network. DCell itself acts as little more than a message router, and the majority of the work in adding fault tolerance is still handled by Celluloid. This is an example of a cluster with 5 nodes: In this picture the green nodes represent individual Ruby VMs.
The links between the nodes are shown in black or gray to illustrate actively connected or potentially connected nodes. DCell makes connections between nodes lazily as actors request them.