syndicate-js/packages/core/examples/box-and-client.js

#!/usr/bin/env node
/// SPDX-License-Identifier: GPL-3.0-or-later
/// SPDX-FileCopyrightText: Copyright © 2016-2021 Tony Garnock-Jones <tonyg@leastfixedpoint.com>

const { bootModule, Dataspace, Skeleton, Ground, Record, Discard, Capture, Observe } = require('..');
const __ = Discard._instance;
const _$ = Capture(__);

const BoxState = Record.makeConstructor()(Symbol.for('BoxState'), ['value']);
const SetBox = Record.makeConstructor()(Symbol.for('SetBox'), ['newValue']);

const N = 100000;

console.time('box-and-client-' + N.toString());

function boot(thisFacet) {
  thisFacet.spawn('box', function (thisFacet) {
    thisFacet.declareField(this, 'value', 0);
    thisFacet.addEndpoint(() => {
      // console.log('recomputing published BoxState', this.value);
      return { assertion: BoxState(this.value), analysis: null };
    });
    thisFacet.addDataflow(() => {
      // console.log('dataflow saw new value', this.value);
      if (this.value === N) {
        thisFacet.stop(() => {
          console.log('terminated box root facet');
        });
      }
    });
    thisFacet.addEndpoint(() => {
      let analysis = Skeleton.analyzeAssertion(SetBox(_$));
      analysis.callback = thisFacet.wrap((thisFacet, evt, vs) => {
        if (evt === Skeleton.EventType.MESSAGE) {
          thisFacet.scheduleScript(() => {
            this.value = vs[0];
            // console.log('box updated value', vs[0]);
          });
        }
      });
      return { assertion: Observe(SetBox(_$)), analysis };
    });
  });

  thisFacet.spawn('client', function (thisFacet) {
    thisFacet.addEndpoint(() => {
      let analysis = Skeleton.analyzeAssertion(BoxState(_$));
      analysis.callback = thisFacet.wrap((thisFacet, evt, [v]) => {
        if (evt === Skeleton.EventType.ADDED) {
          thisFacet.scheduleScript(() => {
            // console.log('client sending SetBox', v + 1);
            thisFacet.send(SetBox(v + 1));
          });
        }
      });
      return { assertion: Observe(BoxState(_$)), analysis };
    });
    thisFacet.addEndpoint(() => {
      let analysis = Skeleton.analyzeAssertion(BoxState(__));
      analysis.callback = thisFacet.wrap((thisFacet, evt, _vs) => {
        if (evt === Skeleton.EventType.REMOVED) {
          thisFacet.scheduleScript(() => {
            console.log('box gone');
          });
        }
      });
      return { assertion: Observe(BoxState(__)), analysis };
    });
  });

  thisFacet.actor.dataspace.ground().addStopHandler(() =>
    console.timeEnd('box-and-client-' + N.toString()));
}

bootModule(boot);