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InnerContextAccess Capacity

The built-in capacity InnerContextAccess provides access to the inner context of the agent. This is a key feature for creating holonic agent implementation. The context supported by this built-in capacity is the “inner context,” illustrated by the bottom context in the figure above.

1. Retrieving the Inner Context

For retrieving the inner context of an agent, this built-in capacity provides the following function:

def getInnerContext : AgentContext

Example:

agent A {
	uses InnerContextAccess
	var c : AgentContext
	def myaction {
		c = getInnerContext
	}
}

2. Retrieving the Default Space of the Inner Context

For retrieving the default space of the inner context, this built-in capacity provides the following function:

def getInnerDefaultSpace : EventSpace

Example:

agent A {
	uses InnerContextAccess
	var s : EventSpace
	def myaction {
		s = getInnerDefaultSpace
	}
}

3. Members of an Agent

For retrieving information on the member agents of the current agent, several functions are provided by this built-in capacity. A member agent is an agent that is not the calling agent, and is a member of at least one space of the inner context.

The first function replies if the calling agent has other agents as members of its inner context:

def hasMemberAgent : boolean

The second function replies the number of agents that are members of the inner context of the calling agent:

def getMemberAgentCount : int

The third function replies all the member agents in the inner context:

def getMemberAgents : ConcurrentSet<UUID>

Examples:

agent A {
	uses InnerContextAccess
	var b : boolean
	var n : int
	var m : ConcurrentSet<UUID>
	def myaction {
		b = hasMemberAgent
		n = getMemberAgentCount
		m = getMemberAgents
	}
}

The InnerContextAccess provides a collection of utility functions that test if their parameters are related to the inner context.

Function Explanation
isInnerDefaultSpace(Space) tests if the given space is the default space of the inner context.
isInnerDefaultSpace(SpaceID) tests if the default space of the inner context has the given identifier.
isInnerDefaultSpace(UUID) tests if the default space of the inner context has the given identifier.
isInInnerDefaultSpace(Event) tests if the given event was emitted in the default space of the inner context.

The following example illustrates the use of the isInInnerDefaultSpace function in the guard of an behavior unit. In this example, the behavior unit is run only if the event of type AnEvent was emitted in the default space of the inner context.

Note According to the General Syntax Reference, the event.isInnerDefaultSpace is equivalent to isInnerDefaultSpace(event).

on AnEvent [ occurrence.inInnerDefaultSpace ] {
	// Do something with the event when it was emitted in the inner default space
}

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