Tuple space is an implementation of the associative memory paradigm for distributed computing. It provides a repository of tuples that can be accessed concurrently.

Orleans is a framework that provides a straight-forward approach to building distributed high-scale computing applications, without the need to learn and apply complex concurrency or other scaling patterns.

OrleanSpaces is a package that brings the power of the tuple space programming model into the .NET world, by using Orleans as the backbone.

Much the same way as actors in Orleans, the tuple space in OrleanSpaces can't be explicitly created or destroyed, it always exists, virtually! Its existence transcends the lifetime of any of its in-memory instantiations, and thus the lifetime of any particular server. This alleviates the developer from a lot of ceremonial/infrastructural work that would have been neccessary.

The IN and RD operations in the tuple space paradigm, are inherently blocking operations. If there is no matching tuple found in the space, then the process which has called these operations, has to wait until it gets a matching tuple. This, intrinsically has an impact on the general availability of the whole system. In OrleanSpaces these operations are done in a fully-asynchronous way, via callback channels.

When I say that IN and RD are implemented in a fully-asynchronous way, I am not referring to the non-blocking versions INP and RDP! These are sepparate concepts, which by the way are also implemented in OrleanSpaces.

While the tuple space paradigm offers unparalled computing capabilities, it is quite the feat to get it right! A proper implementation ideally should support capabilities like:

• Scalability
• Availability
• Resiliency
• Persistence
• Transactions
• Concurrency
• Location transparancy

Hobby implementations of the tuple space fail to deliver on a lot of those, and while enterprise solutions (JavaSpaces, GigaSpaces, IBM TSpaces, etc.) do a better job at it, they usually come with a price, and put the burden of managing the spaces' state to the developer.

All of the above-mentioned capabilities come out-of-the-box with Orleans. The idea was not to reinvent the wheel, but instead leverage Orleans, while providing an abstraction to the client, and build features upon it.

Package	Description	NuGet Version	Test Coverage
OrleanSpaces	Main library.
OrleanSpaces.Analyzers	Code analysis and fixes for OrleanSpaces.

• OrleanSpaces
• OrleanSpaces.Analyzers

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Copyright © Ledjon Behluli