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-rw-r--r--lib/queuehandler.php77
1 files changed, 77 insertions, 0 deletions
diff --git a/lib/queuehandler.php b/lib/queuehandler.php
index 8c65a97c6..cd43b1e09 100644
--- a/lib/queuehandler.php
+++ b/lib/queuehandler.php
@@ -27,6 +27,22 @@ define('CLAIM_TIMEOUT', 1200);
define('QUEUE_HANDLER_MISS_IDLE', 10);
define('QUEUE_HANDLER_HIT_IDLE', 0);
+/**
+ * Base class for queue handlers.
+ *
+ * As extensions of the Daemon class, each queue handler has the ability
+ * to launch itself in the background, at which point it'll pass control
+ * to the configured QueueManager class to poll for updates.
+ *
+ * Subclasses must override at least the following methods:
+ * - transport
+ * - start
+ * - finish
+ * - handle_notice
+ *
+ * Some subclasses will also want to override the idle handler:
+ * - idle
+ */
class QueueHandler extends Daemon
{
@@ -39,6 +55,14 @@ class QueueHandler extends Daemon
}
}
+ /**
+ * How many seconds a polling-based queue manager should wait between
+ * checks for new items to handle.
+ *
+ * Defaults to 60 seconds; override to speed up or slow down.
+ *
+ * @return int timeout in seconds
+ */
function timeout()
{
return 60;
@@ -54,24 +78,69 @@ class QueueHandler extends Daemon
return strtolower($this->class_name().'.'.$this->get_id());
}
+ /**
+ * Return transport keyword which identifies items this queue handler
+ * services; must be defined for all subclasses.
+ *
+ * Must be 8 characters or less to fit in the queue_item database.
+ * ex "email", "jabber", "sms", "irc", ...
+ *
+ * @return string
+ */
function transport()
{
return null;
}
+ /**
+ * Initialization, run when the queue handler starts.
+ * If this function indicates failure, the handler run will be aborted.
+ *
+ * @fixme run() will abort if this doesn't return true,
+ * but some subclasses don't bother.
+ * @return boolean true on success, false on failure
+ */
function start()
{
}
+ /**
+ * Cleanup, run when the queue handler ends.
+ * If this function indicates failure, a warning will be logged.
+ *
+ * @fixme run() will throw warnings if this doesn't return true,
+ * but many subclasses don't bother.
+ * @return boolean true on success, false on failure
+ */
function finish()
{
}
+ /**
+ * Here's the meat of your queue handler -- you're handed a Notice
+ * object, which you may do as you will with.
+ *
+ * If this function indicates failure, a warning will be logged
+ * and the item is placed back in the queue to be re-run.
+ *
+ * @param Notice $notice
+ * @return boolean true on success, false on failure
+ */
function handle_notice($notice)
{
return true;
}
+ /**
+ * Setup and start of run loop for this queue handler as a daemon.
+ * Most of the heavy lifting is passed on to the QueueManager's service()
+ * method, which passes control back to our handle_notice() method for
+ * each notice that comes in on the queue.
+ *
+ * Most of the time this won't need to be overridden in a subclass.
+ *
+ * @return boolean true on success, false on failure
+ */
function run()
{
if (!$this->start()) {
@@ -100,6 +169,14 @@ class QueueHandler extends Daemon
return true;
}
+ /**
+ * Called by QueueHandler after each handled item or empty polling cycle.
+ * This is a good time to e.g. service your XMPP connection.
+ *
+ * Doesn't need to be overridden if there's no maintenance to do.
+ *
+ * @param int $timeout seconds to sleep if there's nothing to do
+ */
function idle($timeout=0)
{
if ($timeout > 0) {