35 lines
1.2 KiB
Racket
35 lines
1.2 KiB
Racket
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#lang racket/base
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;; Keep track of actor hierarchy, e.g. for
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;; - naming specific actors in traces, or
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;; - injecting events from the outside world to specific locations in the tree
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(provide current-actor-path-rev
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current-actor-path
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call/extended-actor-path
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gen:actor-hierarchy-node
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actor-hierarchy-node-deliver)
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(require racket/generic)
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;; Parameterof (Listof Any)
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;; Path to the active leaf in the process tree. The car end is the
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;; leaf; the cdr end, the root.
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(define current-actor-path-rev (make-parameter '()))
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;; Retrieves current-actor-path-rev, but reversed, for use with
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;; actor-hierarchy-node-deliver.
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(define (current-actor-path) (reverse (current-actor-path-rev)))
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;; Any (-> Any) -> Any
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;; Pushes pid on current-actor-path for the duration of the call to thunk.
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(define (call/extended-actor-path pid thunk)
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(parameterize ((current-actor-path-rev (cons pid (current-actor-path-rev))))
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(thunk)))
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;; Generic interface for non-leaf nodes in the hierarchy.
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(define-generics actor-hierarchy-node
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;; Deliver an event to a specific node in the hierarchy.
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(actor-hierarchy-node-deliver actor-hierarchy-node
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relative-path
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event))
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