@orbit/coordinator
Version:
A coordinator and set of coordination strategies for managing data flow and keeping @orbit/data sources in sync.
73 lines • 9.61 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.LogTruncationStrategy = void 0;
const strategy_1 = require("../strategy");
class LogTruncationStrategy extends strategy_1.Strategy {
constructor(options = {}) {
super({
...options,
name: options.name || 'log-truncation'
});
this._transformListeners = {};
}
async activate(coordinator, options = {}) {
await super.activate(coordinator, options);
this._transformListeners = {};
for (let source of this._sources) {
this._connectSource(source);
}
}
async deactivate() {
await super.deactivate();
for (let source of this._sources) {
this._disconnectSource(source);
}
this._transformListeners = {};
}
async _review(source) {
let sources = this._sources;
let transformId = source.transformLog.head;
if (transformId && sources.length > 1) {
let match = true;
for (let i = 0; i < sources.length; i++) {
let s = sources[i];
if (s !== source) {
if (!s.requestQueue.empty ||
!s.syncQueue.empty ||
!s.transformLog.contains(transformId)) {
match = false;
break;
}
}
}
if (match) {
return this._truncateSources(transformId, 0);
}
}
}
_truncateSources(transformId, relativePosition) {
return this._sources.reduce((chain, source) => {
return chain.then(() => source.transformLog.truncate(transformId, relativePosition));
}, Promise.resolve());
}
_connectSource(source) {
const listener = async () => {
if (source.requestQueue.empty && source.syncQueue.empty) {
return this._review(source);
}
};
const sourceName = this.getSourceName(source);
this._transformListeners[sourceName] = listener;
source.syncQueue.on('complete', listener);
source.requestQueue.on('complete', listener);
}
_disconnectSource(source) {
const sourceName = this.getSourceName(source);
const listener = this._transformListeners[sourceName];
source.syncQueue.off('complete', listener);
source.requestQueue.off('complete', listener);
delete this._transformListeners[sourceName];
}
}
exports.LogTruncationStrategy = LogTruncationStrategy;
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