tardieu commented on a change in pull request #3202: Support action
continuations in the controller
URL:
https://github.com/apache/incubator-openwhisk/pull/3202#discussion_r166486764
##########
File path:
core/controller/src/main/scala/whisk/core/controller/actions/PrimitiveActions.scala
##########
@@ -140,6 +200,387 @@ protected[actions] trait PrimitiveActions {
}
}
+ /**
+ * Mutable cumulative accounting of what happened during the execution of a
composition.
+ *
+ * Compositions are aborted if the number of action invocations exceeds a
limit.
+ * The permitted max is n component invocations plus 2n+1 conductor
invocations (where n is the actionSequenceLimit).
+ * The max is chosen to permit a sequence with up to n primitive actions.
+ *
+ * NOTE:
+ * A sequence invocation counts as one invocation irrespective of the number
of action invocations in the sequence.
+ * If one component of a composition is also a composition, the caller and
callee share the same accounting object.
+ * The counts are shared between callers and callees so the limit applies
globally.
+ *
+ * @param components the current count of component actions already invoked
+ * @param conductors the current count of conductor actions already invoked
+ */
+ private case class CompositionAccounting(var components: Int = 0, var
conductors: Int = 0)
+
+ /**
+ * A mutable session object to keep track of the execution of one
composition.
+ *
+ * NOTE:
+ * The session object is not shared between callers and callees.
+ * A callee has a reference to the session object for the caller.
+ * This permits the callee to return to the caller when done.
+ *
+ * @param activationId the activationId for the composition (ie the
activation record for the composition)
+ * @param start the start time for the composition
+ * @param action the conductor action responsible for the execution of the
composition
+ * @param cause the cause of the composition (activationId of the enclosing
sequence or composition if any)
+ * @param duration the "user" time so far executing the composition (sum of
durations for
+ * all actions invoked so far which is different from the total time
spent executing the composition)
+ * @param maxMemory the maximum memory annotation observed so far for the
conductor action and components
+ * @param state the json state object to inject in the parameter object of
the next conductor invocation
+ * @param accounting the global accounting object used to abort compositions
requiring too many action invocations
+ * @param logs a mutable buffer that is appended with new activation ids as
the composition unfolds
+ * (in contrast with sequences, the logs of a hierarchy of
compositions is not flattened)
+ * @param caller the session object for the parent composition (caller) if
any
+ * @param result a placeholder for returning the result of the composition
invocation (blocking invocation only)
+ */
+ private case class Session(activationId: ActivationId,
+ start: Instant,
+ action: ExecutableWhiskActionMetaData,
+ cause: Option[ActivationId],
+ var duration: Long,
+ var maxMemory: Int,
+ var state: Option[JsObject],
+ accounting: CompositionAccounting,
+ logs: Buffer[ActivationId],
+ caller: Option[Session],
+ result: Option[Promise[Either[ActivationId,
WhiskActivation]]])
Review comment:
Ok I'll replace the promise with a future.
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