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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
var Timer = process.binding('timer').Timer;
var L = require('_linklist');
var assert = require('assert').ok;
var debug;
if (process.env.NODE_DEBUG && /timer/.test(process.env.NODE_DEBUG)) {
debug = function() { require('util').error.apply(this, arguments); };
} else {
debug = function() { };
}
// IDLE TIMEOUTS
//
// Because often many sockets will have the same idle timeout we will not
// use one timeout watcher per item. It is too much overhead. Instead
// we'll use a single watcher for all sockets with the same timeout value
// and a linked list. This technique is described in the libev manual:
// http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#Be_smart_about_timeouts
// Object containing all lists, timers
// key = time in milliseconds
// value = list
var lists = {};
// the main function - creates lists on demand and the watchers associated
// with them.
function insert(item, msecs) {
item._idleStart = new Date();
item._idleTimeout = msecs;
if (msecs < 0) return;
var list;
if (lists[msecs]) {
list = lists[msecs];
} else {
list = new Timer();
L.init(list);
lists[msecs] = list;
list.callback = function() {
debug('timeout callback ' + msecs);
// TODO - don't stop and start the watcher all the time.
// just set its repeat
var now = new Date();
debug('now: ' + now);
var first;
while (first = L.peek(list)) {
var diff = now - first._idleStart;
if (diff + 1 < msecs) {
list.again(msecs - diff);
debug(msecs + ' list wait because diff is ' + diff);
return;
} else {
L.remove(first);
assert(first !== L.peek(list));
if (first._onTimeout) first._onTimeout();
}
}
debug(msecs + ' list empty');
assert(L.isEmpty(list));
list.stop();
};
}
if (L.isEmpty(list)) {
// if empty (re)start the timer
list.again(msecs);
}
L.append(list, item);
assert(!L.isEmpty(list)); // list is not empty
}
var unenroll = exports.unenroll = function(item) {
L.remove(item);
var list = lists[item._idleTimeout];
// if empty then stop the watcher
debug('unenroll');
if (list && L.isEmpty(list)) {
debug('unenroll: list empty');
list.stop();
}
};
// Does not start the time, just sets up the members needed.
exports.enroll = function(item, msecs) {
// if this item was already in a list somewhere
// then we should unenroll it from that
if (item._idleNext) unenroll(item);
item._idleTimeout = msecs;
L.init(item);
};
// call this whenever the item is active (not idle)
// it will reset its timeout.
exports.active = function(item) {
var msecs = item._idleTimeout;
if (msecs >= 0) {
var list = lists[msecs];
if (item._idleNext == item) {
insert(item, msecs);
} else {
item._idleStart = new Date();
L.append(list, item);
}
}
};
/*
* DOM-style timers
*/
exports.setTimeout = function(callback, after) {
var timer;
if (after <= 0) {
// Use the slow case for after == 0
timer = new Timer();
timer.callback = callback;
} else {
timer = { _idleTimeout: after, _onTimeout: callback };
timer._idlePrev = timer;
timer._idleNext = timer;
}
/*
* Sometimes setTimeout is called with arguments, EG
*
* setTimeout(callback, 2000, "hello", "world")
*
* If that's the case we need to call the callback with
* those args. The overhead of an extra closure is not
* desired in the normal case.
*/
if (arguments.length > 2) {
var args = Array.prototype.slice.call(arguments, 2);
var c = function() {
callback.apply(timer, args);
};
if (timer instanceof Timer) {
timer.callback = c;
} else {
timer._onTimeout = c;
}
}
if (timer instanceof Timer) {
timer.start(0, 0);
} else {
exports.active(timer);
}
return timer;
};
exports.clearTimeout = function(timer) {
if (timer && (timer.callback || timer._onTimeout)) {
timer.callback = timer._onTimeout = null;
exports.unenroll(timer);
if (timer instanceof Timer) timer.stop(); // for after === 0
}
};
exports.setInterval = function(callback, repeat) {
var timer = new Timer();
if (arguments.length > 2) {
var args = Array.prototype.slice.call(arguments, 2);
timer.callback = function() {
callback.apply(timer, args);
};
} else {
timer.callback = callback;
}
timer.start(repeat, repeat ? repeat : 1);
return timer;
};
exports.clearInterval = function(timer) {
if (timer instanceof Timer) {
timer.callback = null;
timer.stop();
}
};
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