48 lines
1.4 KiB
JavaScript
48 lines
1.4 KiB
JavaScript
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'use strict';
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var Cell = require('./cell'),
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Pledge = require('./pledge');
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var Pipeline = function(sessions) {
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this._cells = sessions.map(function(session) { return new Cell(session) });
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this._stopped = {incoming: false, outgoing: false};
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};
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Pipeline.prototype.processIncomingMessage = function(message, callback, context) {
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if (this._stopped.incoming) return;
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this._loop('incoming', this._cells.length - 1, -1, -1, message, callback, context);
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};
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Pipeline.prototype.processOutgoingMessage = function(message, callback, context) {
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if (this._stopped.outgoing) return;
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this._loop('outgoing', 0, this._cells.length, 1, message, callback, context);
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};
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Pipeline.prototype.close = function(callback, context) {
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this._stopped = {incoming: true, outgoing: true};
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var closed = this._cells.map(function(a) { return a.close() });
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if (callback)
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Pledge.all(closed).then(function() { callback.call(context) });
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};
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Pipeline.prototype._loop = function(direction, start, end, step, message, callback, context) {
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var cells = this._cells,
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n = cells.length,
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self = this;
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while (n--) cells[n].pending(direction);
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var pipe = function(index, error, msg) {
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if (index === end) return callback.call(context, error, msg);
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cells[index][direction](error, msg, function(err, m) {
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if (err) self._stopped[direction] = true;
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pipe(index + step, err, m);
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});
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};
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pipe(start, null, message);
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};
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module.exports = Pipeline;
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