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authorJim Hahn <jrh3@att.com>2020-10-16 14:17:43 +0000
committerGerrit Code Review <gerrit@onap.org>2020-10-16 14:17:43 +0000
commit5190c58837149c4599182d211d8ae5bd83003d34 (patch)
tree6186091f088a43623a2b9ebf9b203fc33e90825a /src/site-docs/adoc/fragments/apex-policy-model/concept-state.adoc
parentc293413c1c46d3c59ff8a855d683f4614bbe644a (diff)
parent0cf967c0239a8ab9c8b8831b700b72d9a08f7b03 (diff)
Merge "Remove apex asciidoc documents"
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-//
-// ============LICENSE_START=======================================================
-// Copyright (C) 2016-2018 Ericsson. All rights reserved.
-// ================================================================================
-// This file is licensed under the CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE
-// Full license text at https://creativecommons.org/licenses/by/4.0/legalcode
-//
-// SPDX-License-Identifier: CC-BY-4.0
-// ============LICENSE_END=========================================================
-//
-// @author Sven van der Meer (sven.van.der.meer@ericsson.com)
-//
-
-== Concept: State
-
-The __State__ concept represents a phase or a stage in a policy, with a policy being composed of a series of states.
-Each state has at least one but may have many tasks and, on each run of execution, a state executes one and only one of its tasks.
-If a state has more than one task, then its task selection logic is used to select which task to execute.
-Task selection logic is programmable logic provided by the state designer.
-That logic can use incoming, policy, global, and external context to select which task best accomplishes the purpose of the state in a give situation if more than one task has been specified on a state.
-A state calls one and only one task when it is executed.
-
-Each state is triggered by an event, which means that all tasks of a state must also be triggered by that same event.
-The set of output events for a state is the union of all output events from all tasks for that task.
-In practice at the moment, because a state can only have a single input event, a state that is not the final state of a policy
-may only output a single event and all tasks of that state may also only output that single event.
-In future work, the concept of having a less restrictive trigger pattern will be examined.
-
-A __State__ concept is keyed with a `ReferenceKey` key, which references the __Policy__ concept that owns the state.
-The __LocalName__ field of the `ReferenceKey` holds the name of the state.
-As a state is part of a chain of states, the __NextState__ field of a state holds the `ReferenceKey` key of the state in the policy to execute after this state.
-
-The __Trigger__ field of a state holds the `ArtifactKey` of the event that triggers this state.
-The __OutgoingEvents__ field holds the `ArtifactKey` references of all possible events that may be output from the state.
-This is a set that is the union of all output events of all tasks of the state.
-
-The __Task__ concepts that hold the definitions of the task for the state are held as a set of `ArtifactKey` references in the state.
-The __DefaultTask__ field holds a reference to the default task for the state, a task that is executed if no task selection logic is
-specified.
-If the state has only one task, that task is the default task.
-
-The __Logic__ concept referenced by a state holds the task selection logic for a state.
-The task selection logic uses the incoming context (parameters of the incoming event) and other context to determine the best task to use to execute its goals.
-The state holds a set of references to __ContextItem__ and __ContextItemTemplate__ definitions for the context used by its task selection logic.
-