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73 lines
1.5 KiB
73 lines
1.5 KiB
'use strict';
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var RingBuffer = require('./ring_buffer');
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var Functor = function(session, method) {
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this._session = session;
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this._method = method;
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this._queue = new RingBuffer(Functor.QUEUE_SIZE);
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this._stopped = false;
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this.pending = 0;
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};
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Functor.QUEUE_SIZE = 8;
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Functor.prototype.call = function(error, message, callback, context) {
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if (this._stopped) return;
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var record = { error: error, message: message, callback: callback, context: context, done: false },
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called = false,
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self = this;
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this._queue.push(record);
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if (record.error) {
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record.done = true;
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this._stop();
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return this._flushQueue();
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}
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var handler = function(err, msg) {
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if (!(called ^ (called = true))) return;
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if (err) {
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self._stop();
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record.error = err;
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record.message = null;
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} else {
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record.message = msg;
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}
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record.done = true;
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self._flushQueue();
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};
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try {
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this._session[this._method](message, handler);
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} catch (err) {
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handler(err);
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}
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};
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Functor.prototype._stop = function() {
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this.pending = this._queue.length;
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this._stopped = true;
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};
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Functor.prototype._flushQueue = function() {
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var queue = this._queue, record;
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while (queue.length > 0 && queue.peek().done) {
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record = queue.shift();
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if (record.error) {
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this.pending = 0;
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queue.clear();
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} else {
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this.pending -= 1;
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}
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record.callback.call(record.context, record.error, record.message);
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}
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};
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module.exports = Functor;
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