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<?php
/*
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
if (!defined('STATUSNET')) {
exit(1);
}
/**
* When we have a large batch of PuSH consumers, we break the data set
* into smaller chunks. Enqueue final destinations...
*
* @package Hub
* @author Brion Vibber <brion@status.net>
*/
class HubPrepQueueHandler extends QueueHandler
{
// Enqueue this many low-level distributions before re-queueing the rest
// of the batch to be processed later. Helps to keep latency down for other
// things happening during a particularly long OStatus delivery session.
//
// [Could probably ditch this if we had working message delivery priorities
// for queueing, but this isn't supported in ActiveMQ 5.3.]
const ROLLING_BATCH = 20;
function transport()
{
return 'hubprep';
}
function handle($data)
{
$topic = $data['topic'];
$atom = $data['atom'];
$pushCallbacks = $data['pushCallbacks'];
assert(is_string($atom));
assert(is_string($topic));
assert(is_array($pushCallbacks));
// Set up distribution for the first n subscribing sites...
// If we encounter an uncatchable error, queue handling should
// automatically re-run the batch, which could lead to some dupe
// distributions.
//
// Worst case is if one of these hubprep entries dies too many
// times and gets dropped; the rest of the batch won't get processed.
try {
$n = 0;
while (count($pushCallbacks) && $n < self::ROLLING_BATCH) {
$n++;
$callback = array_shift($pushCallbacks);
$sub = HubSub::staticGet($topic, $callback);
if (!$sub) {
common_log(LOG_ERR, "Skipping PuSH delivery for deleted(?) consumer $callback on $topic");
continue;
}
$sub->distribute($atom);
}
} catch (Exception $e) {
common_log(LOG_ERR, "Exception during PuSH batch out: " .
$e->getMessage() .
" prepping $topic to $callback");
}
// And re-queue the rest of the batch!
if (count($pushCallbacks) > 0) {
$sub = new HubSub();
$sub->topic = $topic;
$sub->bulkDistribute($atom, $pushCallbacks);
}
return true;
}
}
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