5.3.4
27 Sandbox
This library is unstable;
compatibility will not be maintained.
See Unstable: May Change Without Warning for more information.
| (require unstable/sandbox) |
procedure
(make-log-based-eval log-file mode) → (-> any/c any)
log-file : path-string? mode : (or/c 'record 'replay)
Creates an evaluator (like make-base-eval) that uses a log
file to either record or replay evaluations.
If mode is 'record, the evaluator records every interaction to log-file, replacing log-file if it already exists. The result of each interaction must be serializable.
If mode is 'replay, the evaluator uses the contents of log-file instead of actually performing evaluatings. For each interaction, it compares the term to evaluate against the next interaction recorded in log-file. If the term matches, the stored result is returned; if not, the evaluator raises an error indicating that it is out of sync with log-file.
Use make-log-based-eval to document libraries when the embedded examples rely on external features that may not be present or appropriately configured on all machines.