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+<?php
+/**
+ * Laconica, the distributed open-source microblogging tool
+ *
+ * Base class for making daemons that can do several tasks in parallel.
+ *
+ * PHP version 5
+ *
+ * LICENCE: 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/>.
+ *
+ * @category Daemon
+ * @package Laconica
+ * @author Zach Copley <zach@controlyourself.ca>
+ * @author Evan Prodromou <evan@controlyourself.ca>
+ * @copyright 2009 Control Yourself, Inc.
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link http://laconi.ca/
+ */
+
+if (!defined('LACONICA')) {
+ exit(1);
+}
+
+declare(ticks = 1);
+
+/**
+ * Daemon able to spawn multiple child processes to do work in parallel
+ *
+ * @category Daemon
+ * @package Laconica
+ * @author Zach Copley <zach@controlyourself.ca>
+ * @author Evan Prodromou <evan@controlyourself.ca>
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link http://laconi.ca/
+ */
+
+class ParallelizingDaemon extends Daemon
+{
+ private $_children = array();
+ private $_interval = 0; // seconds
+ private $_max_children = 0; // maximum number of children
+ private $_debug = false;
+
+ /**
+ * Constructor
+ *
+ * @param string $id the name/id of this daemon
+ * @param int $interval sleep this long before doing everything again
+ * @param int $max_children maximum number of child processes at a time
+ * @param boolean $debug debug output flag
+ *
+ * @return void
+ *
+ **/
+
+ function __construct($id = null, $interval = 60, $max_children = 2,
+ $debug = null)
+ {
+ parent::__construct(true); // daemonize
+
+ $this->_interval = $interval;
+ $this->_max_children = $max_children;
+ $this->_debug = $debug;
+
+ if (isset($id)) {
+ $this->set_id($id);
+ }
+ }
+
+ /**
+ * Run the daemon
+ *
+ * @return void
+ */
+
+ function run()
+ {
+ if (isset($this->_debug)) {
+ echo $this->name() . " - Debugging output enabled.\n";
+ }
+
+ do {
+
+ $objects = $this->getObjects();
+
+ foreach ($objects as $o) {
+
+ // Fork a child for each object
+
+ $pid = pcntl_fork();
+
+ if ($pid == -1) {
+ die ($this->name() . ' - Couldn\'t fork!');
+ }
+
+ if ($pid) {
+
+ // Parent
+
+ if (isset($this->_debug)) {
+ echo $this->name() .
+ " - Forked new child - pid $pid.\n";
+
+ }
+
+ $this->_children[] = $pid;
+
+ } else {
+
+ // Child
+
+ // Do something with each object
+
+ $this->childTask($o);
+
+ exit();
+ }
+
+ // Remove child from ps list as it finishes
+
+ while (($c = pcntl_wait($status, WNOHANG OR WUNTRACED)) > 0) {
+
+ if (isset($this->_debug)) {
+ echo $this->name() . " - Child $c finished.\n";
+ }
+
+ $this->removePs($this->_children, $c);
+ }
+
+ // Wait! We have too many damn kids.
+
+ if (sizeof($this->_children) >= $this->_max_children) {
+
+ if (isset($this->_debug)) {
+ echo $this->name() . " - Too many children. Waiting...\n";
+ }
+
+ if (($c = pcntl_wait($status, WUNTRACED)) > 0) {
+
+ if (isset($this->_debug)) {
+ echo $this->name() .
+ " - Finished waiting for child $c.\n";
+ }
+
+ $this->removePs($this->_children, $c);
+ }
+ }
+ }
+
+ // Remove all children from the process list before restarting
+ while (($c = pcntl_wait($status, WUNTRACED)) > 0) {
+
+ if (isset($this->_debug)) {
+ echo $this->name() . " - Child $c finished.\n";
+ }
+
+ $this->removePs($this->_children, $c);
+ }
+
+ // Rest for a bit
+
+ if (isset($this->_debug)) {
+ echo $this->name() . ' - Waiting ' . $this->_interval .
+ " secs before running again.\n";
+ }
+
+ if ($this->_interval > 0) {
+ sleep($this->_interval);
+ }
+
+ } while (true);
+ }
+
+ /**
+ * Remove a child process from the list of children
+ *
+ * @param array &$plist array of processes
+ * @param int $ps process id
+ *
+ * @return void
+ */
+
+ function removePs(&$plist, $ps)
+ {
+ for ($i = 0; $i < sizeof($plist); $i++) {
+ if ($plist[$i] == $ps) {
+ unset($plist[$i]);
+ $plist = array_values($plist);
+ break;
+ }
+ }
+ }
+
+ /**
+ * Get a list of objects to work on in parallel
+ *
+ * @return array An array of objects to work on
+ */
+
+ function getObjects()
+ {
+ die('Implement ParallelizingDaemon::getObjects().');
+ }
+
+ /**
+ * Do something with each object in parallel
+ *
+ * @param mixed $object data to work on
+ *
+ * @return void
+ */
+
+ function childTask($object)
+ {
+ die("Implement ParallelizingDaemon::childTask($object).");
+ }
+
+} \ No newline at end of file