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  • §

    Workstore

    import { makeAnimation } from '../factory/animation.js';
    import { _isFinite, _keys, _now } from './shared-vars.js';
  • §

    workstore, workstoreLastAccessed - Scrawl-canvas maintains a semi-permanent storage space for some processing objects that are computationally expensive, for instance grids, matrix reference data objects, etc. The engine also maintains a record of when each of these processing objects was last accessed and will remove objects if they have not been accessed in the last few seconds.

    const workstore = {};
    const workstoreLastAccessed = {};
  • §

    lifetimeLength - measure in milliseconds before an entry in the workstore goes stale and gets removed from the workstore

    let lifetimeLength = 1000;
  • §

    setWorkstoreLifetimeLength

    export const setWorkstoreLifetimeLength = (val) => {
    
        if (_isFinite(val) && val >= 200 && val <= 10000) lifetimeLength = val;
    };
  • §

    setFilterMemoizationChoke - DEPRECATED in favour of setWorkstoreLifetimeLength

    export const setFilterMemoizationChoke = (val) => {
    
        if (_isFinite(val) && val >= 200 && val <= 10000) lifetimeLength = val;
    };
  • §

    checkForWorkstoreItem - returns a boolean: true if item exists in workstore

    export const checkForWorkstoreItem = (identifier) => !!workstore[identifier];
  • §

    getWorkstoreItem, setWorkstoreItem - retrieve, or set, the value stored at the identifier key

    export const getWorkstoreItem = (identifier) => {
    
        if (workstore[identifier]) {
    
            workstoreLastAccessed[identifier] = _now();
            return workstore[identifier];
        }
        return null;
    };
    
    export const setWorkstoreItem = (identifier, value) => {
    
        workstore[identifier] = value;
        workstoreLastAccessed[identifier] = _now();
    };
  • §

    getOrAddWorkstoreItem - retrieves the value stored at the identifier key. If the key does not exist, create and populate it with the value array/object, then return that value;

    export const getOrAddWorkstoreItem = function (identifier, value = []) {
    
        const now = _now();
    
        if (workstore[identifier]) {
    
            workstoreLastAccessed[identifier] = now;
            return workstore[identifier];
        }
    
        workstore[identifier] = value;
        workstoreLastAccessed[identifier] = now;
        return workstore[identifier];
    };
  • §

    setAndReturnWorkstoreItem - create or set the value stored at the identifier key, then return that value;

    export const setAndReturnWorkstoreItem = function (identifier, value = []) {
    
        workstore[identifier] = value;
        workstoreLastAccessed[identifier] = _now();
        return workstore[identifier];
    };
  • §

    Workstore hygeine

    purgeChoke, purgeLastPerformed - minimum time between purge runs, and when the last purge took place

    let purgeChoke = 200;
    let purgeLastPerformed = 0;
  • §

    setWorkstorePurgeChoke

    export const setWorkstorePurgeChoke = (val) => {
    
        if (_isFinite(val) && val >= 10 && val <= 5000) purgeChoke = val;
    };
  • §

    purgeWorkstore - internal function

    const purgeWorkstore = () => {
    
        const now = _now(),
            choke = now - purgeChoke;
    
        if (purgeLastPerformed < choke) {
    
            const workstoreKeys = _keys(workstore),
                workstoreChoke = now - lifetimeLength;
    
            for (let i = 0, iz = workstoreKeys.length, s; i < iz; i++) {
    
                s = workstoreKeys[i];
    
                if (workstoreLastAccessed[s] < workstoreChoke) {
    
                    delete workstore[s];
                    delete workstoreLastAccessed[s];
                }
            }
            purgeLastPerformed = now;
        }
    };
  • §

    core-workstore-hygeine animation object runs every RAF cycle

    makeAnimation({
    
        name: 'SC-core-workstore-hygiene',
        order: 998,
        fn: () => purgeWorkstore(),
    });