aaac7fed
 liuqimichale
add
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'use strict';
var RingBuffer = require('./ring_buffer');
var Functor = function(session, method) {
this._session = session;
this._method = method;
this._queue = new RingBuffer(Functor.QUEUE_SIZE);
this._stopped = false;
this.pending = 0;
};
Functor.QUEUE_SIZE = 8;
Functor.prototype.call = function(error, message, callback, context) {
if (this._stopped) return;
var record = {error: error, message: message, callback: callback, context: context, done: false},
called = false,
self = this;
this._queue.push(record);
if (record.error) {
record.done = true;
this._stop();
return this._flushQueue();
}
var handler = function(err, msg) {
if (!(called ^ (called = true))) return;
if (err) {
self._stop();
record.error = err;
record.message = null;
} else {
record.message = msg;
}
record.done = true;
self._flushQueue();
};
try {
this._session[this._method](message, handler);
} catch (err) {
handler(err);
}
};
Functor.prototype._stop = function() {
this.pending = this._queue.length;
this._stopped = true;
};
Functor.prototype._flushQueue = function() {
var queue = this._queue, record;
while (queue.length > 0 && queue.peek().done) {
record = queue.shift();
if (record.error) {
this.pending = 0;
queue.clear();
} else {
this.pending -= 1;
}
record.callback.call(record.context, record.error, record.message);
}
};
module.exports = Functor;
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