Emesary is a simple and efficient class based interobject communcation system to allow decoupled disparate parts of a system to function together without knowing about each. It allows decoupling and removal of dependencies by using notifications to cause actions or to query values.
Emesary is all about decoupling and removing dependecies, and improving the structure of code. Using Emesary you can more easily define the what rather than the how. By using what is essential an event driven system it is easy to add or remove modules, and also for extra modules to be inserted that the rest of the aircraft knows nothing about (e.g. FGCamera or the Walker).
see: http://chateau-logic.com/content/emesary-nasal-implementation-flightgear
Emesary Multiplayer Bridge
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There is also support for transmitting messages over MP which allows models to communicate with each other in a decoupled method using notifications. What happens is that bridged messags simply arrive at the Receive method of recipients in other models on other running instances without the need to do anything special.
see: http://chateau-logic.com/content/emesary-multiplayer-bridge-flightgear
AN/SPN-46 ACLS
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The AN/SPN-46 is an ACLS implementation using Emesary. ACLS is the Navy's version of ILS.
The carriers have all been modified to have an AN/SPN-46 transmitter. The F-14 will be revised shortly to support this; for the F-14 it is a non-breaking change as the F-14 currently uses the TACAN channel and does it's own ACLS calculations. When the F-14 is revised it will mean that when approaching any carrier it is not necessary to retune the TACAN to get ACLS.
The AN/SPN-46 and ARA-63 (receiver) implementations both support the use of channels; but for the moment this is preset to use channel 2.
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