This commit is contained in:
Tony Volpe
2024-06-17 14:41:24 -04:00
parent f885e93ca8
commit a00f379f7f
11158 changed files with 0 additions and 1781316 deletions

View File

@@ -1,208 +0,0 @@
<?php
/**
* WP Async Request
*
* @package WP-Background-Processing
*/
// phpcs:disable Generic.Commenting.DocComment.MissingShort
/** @noinspection PhpIllegalPsrClassPathInspection */
/** @noinspection AutoloadingIssuesInspection */
// phpcs:disable Generic.Commenting.DocComment.MissingShort
/**
* Abstract Imagify_WP_Async_Request class.
*
* @abstract
*/
abstract class Imagify_WP_Async_Request {
/**
* Prefix
*
* (default value: 'wp')
*
* @var string
* @access protected
*/
protected $prefix = 'wp';
/**
* Action
*
* (default value: 'async_request')
*
* @var string
* @access protected
*/
protected $action = 'async_request';
/**
* Identifier
*
* @var mixed
* @access protected
*/
protected $identifier;
/**
* Data
*
* (default value: array())
*
* @var array
* @access protected
*/
protected $data = array();
/**
* Initiate new async request.
*/
public function __construct() {
$this->identifier = $this->prefix . '_' . $this->action;
add_action( 'wp_ajax_' . $this->identifier, array( $this, 'maybe_handle' ) );
add_action( 'wp_ajax_nopriv_' . $this->identifier, array( $this, 'maybe_handle' ) );
}
/**
* Set data used during the request.
*
* @param array $data Data.
*
* @return $this
*/
public function data( $data ) {
$this->data = $data;
return $this;
}
/**
* Dispatch the async request.
*
* @return array|WP_Error|false HTTP Response array, WP_Error on failure, or false if not attempted.
*/
public function dispatch() {
$url = add_query_arg( $this->get_query_args(), $this->get_query_url() );
$args = $this->get_post_args();
return wp_remote_post( esc_url_raw( $url ), $args );
}
/**
* Get query args.
*
* @return array
*/
protected function get_query_args() {
if ( property_exists( $this, 'query_args' ) ) {
return $this->query_args;
}
$args = array(
'action' => $this->identifier,
'nonce' => wp_create_nonce( $this->identifier ),
);
/**
* Filters the post arguments used during an async request.
*
* @param array $url
*/
return apply_filters( $this->identifier . '_query_args', $args );
}
/**
* Get query URL.
*
* @return string
*/
protected function get_query_url() {
if ( property_exists( $this, 'query_url' ) ) {
return $this->query_url;
}
$url = admin_url( 'admin-ajax.php' );
/**
* Filters the post arguments used during an async request.
*
* @param string $url
*/
return apply_filters( $this->identifier . '_query_url', $url );
}
/**
* Get post args.
*
* @return array
*/
protected function get_post_args() {
if ( property_exists( $this, 'post_args' ) ) {
return $this->post_args;
}
$args = array(
'timeout' => 5,
'blocking' => false,
'body' => $this->data,
'cookies' => $_COOKIE, // Passing cookies ensures request is performed as initiating user.
'sslverify' => apply_filters( 'https_local_ssl_verify', false ), // Local requests, fine to pass false.
);
/**
* Filters the post arguments used during an async request.
*
* @param array $args
*/
return apply_filters( $this->identifier . '_post_args', $args );
}
/**
* Maybe handle a dispatched request.
*
* Check for correct nonce and pass to handler.
*
* @return void|mixed
*/
public function maybe_handle() {
// Don't lock up other requests while processing.
session_write_close();
check_ajax_referer( $this->identifier, 'nonce' );
$this->handle();
return $this->maybe_wp_die();
}
/**
* Should the process exit with wp_die?
*
* @param mixed $return What to return if filter says don't die, default is null.
*
* @return void|mixed
* @noinspection ForgottenDebugOutputInspection
*/
protected function maybe_wp_die( $return = null ) {
/**
* Should wp_die be used?
*
* @return bool
*/
if ( apply_filters( $this->identifier . '_wp_die', true ) ) {
wp_die();
}
return $return;
}
/**
* Handle a dispatched request.
*
* Override this method to perform any actions required
* during the async request.
*/
abstract protected function handle();
}

View File

@@ -1,739 +0,0 @@
<?php
/**
* WP Background Process
*
* @package WP-Background-Processing
*/
// phpcs:disable Generic.Commenting.DocComment.MissingShort
/** @noinspection PhpIllegalPsrClassPathInspection */
/** @noinspection AutoloadingIssuesInspection */
// phpcs:disable Generic.Commenting.DocComment.MissingShort
/**
* Abstract Imagify_WP_Background_Process class.
*
* @abstract
* @extends Imagify_WP_Async_Request
*/
abstract class Imagify_WP_Background_Process extends Imagify_WP_Async_Request {
/**
* Action
*
* (default value: 'background_process')
*
* @var string
* @access protected
*/
protected $action = 'background_process';
/**
* Start time of current process.
*
* (default value: 0)
*
* @var int
* @access protected
*/
protected $start_time = 0;
/**
* Cron_hook_identifier
*
* @var string
* @access protected
*/
protected $cron_hook_identifier;
/**
* Cron_interval_identifier
*
* @var string
* @access protected
*/
protected $cron_interval_identifier;
/**
* The status set when process is cancelling.
*
* @var int
*/
const STATUS_CANCELLED = 1;
/**
* The status set when process is paused or pausing.
*
* @var int;
*/
const STATUS_PAUSED = 2;
/**
* Initiate new background process.
*/
public function __construct() {
parent::__construct();
$this->cron_hook_identifier = $this->identifier . '_cron';
$this->cron_interval_identifier = $this->identifier . '_cron_interval';
add_action( $this->cron_hook_identifier, array( $this, 'handle_cron_healthcheck' ) );
// phpcs:ignore WordPress.WP.CronInterval.ChangeDetected
add_filter( 'cron_schedules', array( $this, 'schedule_cron_healthcheck' ) );
}
/**
* Schedule the cron healthcheck and dispatch an async request to start processing the queue.
*
* @access public
* @return array|WP_Error|false HTTP Response array, WP_Error on failure, or false if not attempted.
*/
public function dispatch() {
if ( $this->is_processing() ) {
// Process already running.
return false;
}
// Schedule the cron healthcheck.
$this->schedule_event();
// Perform remote post.
return parent::dispatch();
}
/**
* Push to the queue.
*
* Note, save must be called in order to persist queued items to a batch for processing.
*
* @param mixed $data Data.
*
* @return $this
*/
public function push_to_queue( $data ) {
$this->data[] = $data;
return $this;
}
/**
* Save the queued items for future processing.
*
* @return $this
*/
public function save() {
$key = $this->generate_key();
if ( ! empty( $this->data ) ) {
update_site_option( $key, $this->data );
}
// Clean out data so that new data isn't prepended with closed session's data.
$this->data = array();
return $this;
}
/**
* Update a batch's queued items.
*
* @param string $key Key.
* @param array $data Data.
*
* @return $this
*/
public function update( $key, $data ) {
if ( ! empty( $data ) ) {
update_site_option( $key, $data );
}
return $this;
}
/**
* Delete a batch of queued items.
*
* @param string $key Key.
*
* @return $this
*/
public function delete( $key ) {
delete_site_option( $key );
return $this;
}
/**
* Delete entire job queue.
*/
public function delete_all() {
$batches = $this->get_batches();
foreach ( $batches as $batch ) {
$this->delete( $batch->key );
}
delete_site_option( $this->get_status_key() );
$this->cancelled();
}
/**
* Cancel job on next batch.
*/
public function cancel() {
update_site_option( $this->get_status_key(), self::STATUS_CANCELLED );
// Just in case the job was paused at the time.
$this->dispatch();
}
/**
* Has the process been cancelled?
*
* @return bool
*/
public function is_cancelled() {
$status = get_site_option( $this->get_status_key(), 0 );
return absint( $status ) === self::STATUS_CANCELLED;
}
/**
* Called when background process has been cancelled.
*/
protected function cancelled() {
do_action( $this->identifier . '_cancelled' );
}
/**
* Pause job on next batch.
*/
public function pause() {
update_site_option( $this->get_status_key(), self::STATUS_PAUSED );
}
/**
* Is the job paused?
*
* @return bool
*/
public function is_paused() {
$status = get_site_option( $this->get_status_key(), 0 );
return absint( $status ) === self::STATUS_PAUSED;
}
/**
* Called when background process has been paused.
*/
protected function paused() {
do_action( $this->identifier . '_paused' );
}
/**
* Resume job.
*/
public function resume() {
delete_site_option( $this->get_status_key() );
$this->schedule_event();
$this->dispatch();
$this->resumed();
}
/**
* Called when background process has been resumed.
*/
protected function resumed() {
do_action( $this->identifier . '_resumed' );
}
/**
* Is queued?
*
* @return bool
*/
public function is_queued() {
return ! $this->is_queue_empty();
}
/**
* Is the tool currently active, e.g. starting, working, paused or cleaning up?
*
* @return bool
*/
public function is_active() {
return $this->is_queued() || $this->is_processing() || $this->is_paused() || $this->is_cancelled();
}
/**
* Generate key for a batch.
*
* Generates a unique key based on microtime. Queue items are
* given a unique key so that they can be merged upon save.
*
* @param int $length Optional max length to trim key to, defaults to 64 characters.
* @param string $key Optional string to append to identifier before hash, defaults to "batch".
*
* @return string
*/
protected function generate_key( $length = 64, $key = 'batch' ) {
$unique = md5( microtime() . wp_rand() );
$prepend = $this->identifier . '_' . $key . '_';
return substr( $prepend . $unique, 0, $length );
}
/**
* Get the status key.
*
* @return string
*/
protected function get_status_key() {
return $this->identifier . '_status';
}
/**
* Maybe process a batch of queued items.
*
* Checks whether data exists within the queue and that
* the process is not already running.
*/
public function maybe_handle() {
// Don't lock up other requests while processing.
session_write_close();
if ( $this->is_processing() ) {
// Background process already running.
return $this->maybe_wp_die();
}
if ( $this->is_cancelled() ) {
$this->clear_scheduled_event();
$this->delete_all();
return $this->maybe_wp_die();
}
if ( $this->is_paused() ) {
$this->clear_scheduled_event();
$this->paused();
return $this->maybe_wp_die();
}
if ( $this->is_queue_empty() ) {
// No data to process.
return $this->maybe_wp_die();
}
check_ajax_referer( $this->identifier, 'nonce' );
$this->handle();
return $this->maybe_wp_die();
}
/**
* Is queue empty?
*
* @return bool
* @noinspection IsEmptyFunctionUsageInspection
*/
protected function is_queue_empty() {
return empty( $this->get_batch() );
}
/**
* Is process running?
*
* Check whether the current process is already running
* in a background process.
*
* @return bool
*
* @deprecated 1.1.0 Superseded.
* @see is_processing()
* @noinspection PhpUnused
*/
protected function is_process_running() {
return $this->is_processing();
}
/**
* Is the background process currently running?
*
* @return bool
*/
public function is_processing() {
if ( get_site_transient( $this->identifier . '_process_lock' ) ) {
// Process already running.
return true;
}
return false;
}
/**
* Lock process.
*
* Lock the process so that multiple instances can't run simultaneously.
* Override if applicable, but the duration should be greater than that
* defined in the time_exceeded() method.
*/
protected function lock_process() {
$this->start_time = time(); // Set start time of current process.
$lock_duration = ( property_exists( $this, 'queue_lock_time' ) ) ? $this->queue_lock_time : 60; // 1 minute
$lock_duration = apply_filters( $this->identifier . '_queue_lock_time', $lock_duration );
set_site_transient( $this->identifier . '_process_lock', microtime(), $lock_duration );
}
/**
* Unlock process.
*
* Unlock the process so that other instances can spawn.
*
* @return $this
*/
protected function unlock_process() {
delete_site_transient( $this->identifier . '_process_lock' );
return $this;
}
/**
* Get batch.
*
* @return stdClass Return the first batch of queued items.
*/
protected function get_batch() {
return array_reduce(
$this->get_batches( 1 ),
static function ( $carry, $batch ) {
return $batch;
},
array()
);
}
/**
* Get batches.
*
* @param int $limit Number of batches to return, defaults to all.
*
* @return array of stdClass
*/
public function get_batches( $limit = 0 ) {
global $wpdb;
if ( empty( $limit ) || ! is_int( $limit ) ) {
$limit = 0;
}
$table = $wpdb->options;
$column = 'option_name';
$key_column = 'option_id';
$value_column = 'option_value';
if ( is_multisite() ) {
$table = $wpdb->sitemeta;
$column = 'meta_key';
$key_column = 'meta_id';
$value_column = 'meta_value';
}
$key = $wpdb->esc_like( $this->identifier . '_batch_' ) . '%';
$sql = '
SELECT *
FROM ' . $table . '
WHERE ' . $column . ' LIKE %s
ORDER BY ' . $key_column . '
';
$args = array( $key );
if ( ! empty( $limit ) ) {
$sql .= ' LIMIT %d';
$args[] = $limit;
}
$items = $wpdb->get_results( $wpdb->prepare( $sql, $args ) ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
$batches = array();
if ( ! empty( $items ) ) {
$batches = array_map(
static function ( $item ) use ( $column, $value_column ) {
$batch = new stdClass();
$batch->key = $item->{$column};
$batch->data = maybe_unserialize( $item->{$value_column} );
return $batch;
},
$items
);
}
return $batches;
}
/**
* Handle a dispatched request.
*
* Pass each queue item to the task handler, while remaining
* within server memory and time limit constraints.
*
* @noinspection DisconnectedForeachInstructionInspection
*/
protected function handle() {
$this->lock_process();
/**
* Number of seconds to sleep between batches. Defaults to 0 seconds, minimum 0.
*
* @param int $seconds
*/
$throttle_seconds = max(
0,
apply_filters(
$this->identifier . '_seconds_between_batches',
apply_filters(
$this->prefix . '_seconds_between_batches',
0
)
)
);
do {
$batch = $this->get_batch();
foreach ( $batch->data as $key => $value ) {
$task = $this->task( $value );
if ( false !== $task ) {
$batch->data[ $key ] = $task;
} else {
unset( $batch->data[ $key ] );
}
// Keep the batch up to date while processing it.
if ( ! empty( $batch->data ) ) {
$this->update( $batch->key, $batch->data );
}
// Let the server breathe a little.
sleep( $throttle_seconds );
// Batch limits reached, or pause or cancel request.
if ( $this->time_exceeded() || $this->memory_exceeded() || $this->is_paused() || $this->is_cancelled() ) {
break;
}
}
// Delete current batch if fully processed.
if ( empty( $batch->data ) ) {
$this->delete( $batch->key );
}
} while ( ! $this->time_exceeded() && ! $this->memory_exceeded() && ! $this->is_queue_empty() && ! $this->is_paused() && ! $this->is_cancelled() );
$this->unlock_process();
// Start next batch or complete process.
if ( ! $this->is_queue_empty() ) {
$this->dispatch();
} else {
$this->complete();
}
return $this->maybe_wp_die();
}
/**
* Memory exceeded?
*
* Ensures the batch process never exceeds 90%
* of the maximum WordPress memory.
*
* @return bool
*/
protected function memory_exceeded() {
$memory_limit = $this->get_memory_limit() * 0.9; // 90% of max memory
$current_memory = memory_get_usage( true );
$return = false;
if ( $current_memory >= $memory_limit ) {
$return = true;
}
return apply_filters( $this->identifier . '_memory_exceeded', $return );
}
/**
* Get memory limit in bytes.
*
* @return int
*/
protected function get_memory_limit() {
if ( function_exists( 'ini_get' ) ) {
$memory_limit = ini_get( 'memory_limit' );
} else {
// Sensible default.
$memory_limit = '128M';
}
if ( ! $memory_limit || -1 === (int) $memory_limit ) {
// Unlimited, set to 32GB.
$memory_limit = '32000M';
}
return wp_convert_hr_to_bytes( $memory_limit );
}
/**
* Time limit exceeded?
*
* Ensures the batch never exceeds a sensible time limit.
* A timeout limit of 30s is common on shared hosting.
*
* @return bool
*/
protected function time_exceeded() {
$finish = $this->start_time + apply_filters( $this->identifier . '_default_time_limit', 20 ); // 20 seconds
$return = false;
if (
! ( defined( 'WP_CLI' ) && WP_CLI ) &&
time() >= $finish
) {
$return = true;
}
return apply_filters( $this->identifier . '_time_exceeded', $return );
}
/**
* Complete processing.
*
* Override if applicable, but ensure that the below actions are
* performed, or, call parent::complete().
*/
protected function complete() {
delete_site_option( $this->get_status_key() );
// Remove the cron healthcheck job from the cron schedule.
$this->clear_scheduled_event();
$this->completed();
}
/**
* Called when background process has completed.
*/
protected function completed() {
do_action( $this->identifier . '_completed' );
}
/**
* Schedule the cron healthcheck job.
*
* @access public
*
* @param mixed $schedules Schedules.
*
* @return mixed
*/
public function schedule_cron_healthcheck( $schedules ) {
$interval = apply_filters( $this->cron_interval_identifier, 5 );
if ( property_exists( $this, 'cron_interval' ) ) {
$interval = apply_filters( $this->cron_interval_identifier, $this->cron_interval );
}
if ( 1 === $interval ) {
$display = __( 'Every Minute' );
} else {
$display = sprintf( __( 'Every %d Minutes' ), $interval );
}
// Adds an "Every NNN Minute(s)" schedule to the existing cron schedules.
$schedules[ $this->cron_interval_identifier ] = array(
'interval' => MINUTE_IN_SECONDS * $interval,
'display' => $display,
);
return $schedules;
}
/**
* Handle cron healthcheck event.
*
* Restart the background process if not already running
* and data exists in the queue.
*/
public function handle_cron_healthcheck() {
if ( $this->is_processing() ) {
// Background process already running.
exit;
}
if ( $this->is_queue_empty() ) {
// No data to process.
$this->clear_scheduled_event();
exit;
}
$this->dispatch();
}
/**
* Schedule the cron healthcheck event.
*/
protected function schedule_event() {
if ( ! wp_next_scheduled( $this->cron_hook_identifier ) ) {
wp_schedule_event( time(), $this->cron_interval_identifier, $this->cron_hook_identifier );
}
}
/**
* Clear scheduled cron healthcheck event.
*/
protected function clear_scheduled_event() {
$timestamp = wp_next_scheduled( $this->cron_hook_identifier );
if ( $timestamp ) {
wp_unschedule_event( $timestamp, $this->cron_hook_identifier );
}
}
/**
* Cancel the background process.
*
* Stop processing queue items, clear cron job and delete batch.
*
* @deprecated 1.1.0 Superseded.
* @see cancel()
* @noinspection PhpUnused
*/
public function cancel_process() {
$this->cancel();
}
/**
* Perform task with queued item.
*
* Override this method to perform any actions required on each
* queue item. Return the modified item for further processing
* in the next pass through. Or, return false to remove the
* item from the queue.
*
* @param mixed $item Queue item to iterate over.
*
* @return mixed
*/
abstract protected function task( $item );
}

View File

@@ -1,135 +0,0 @@
<?php
namespace Imagify\EventManagement;
/**
* The event manager manages events using the WordPress plugin API.
*
* @since 3.1
* @author Carl Alexander <contact@carlalexander.ca>
*/
class EventManager {
/**
* Adds a callback to a specific hook of the WordPress plugin API.
*
* @uses add_filter()
*
* @param string $hook_name Name of the hook.
* @param callable $callback Callback function.
* @param int $priority Priority.
* @param int $accepted_args Number of arguments.
*/
public function add_callback( $hook_name, $callback, $priority = 10, $accepted_args = 1 ) {
add_filter( $hook_name, $callback, $priority, $accepted_args );
}
/**
* Add an event subscriber.
*
* The event manager registers all the hooks that the given subscriber
* wants to register with the WordPress Plugin API.
*
* @param SubscriberInterface $subscriber SubscriberInterface implementation.
*/
public function add_subscriber( SubscriberInterface $subscriber ) {
if ( $subscriber instanceof EventManagerAwareSubscriberInterface ) {
$subscriber->set_event_manager( $this );
}
$events = $subscriber->get_subscribed_events();
if ( empty( $events ) ) {
return;
}
foreach ( $subscriber->get_subscribed_events() as $hook_name => $parameters ) {
$this->add_subscriber_callback( $subscriber, $hook_name, $parameters );
}
}
/**
* Checks the WordPress plugin API to see if the given hook has
* the given callback. The priority of the callback will be returned
* or false. If no callback is given will return true or false if
* there's any callbacks registered to the hook.
*
* @uses has_filter()
*
* @param string $hook_name Hook name.
* @param mixed $callback Callback.
*
* @return bool|int
*/
public function has_callback( $hook_name, $callback = false ) {
return has_filter( $hook_name, $callback );
}
/**
* Removes the given callback from the given hook. The WordPress plugin API only
* removes the hook if the callback and priority match a registered hook.
*
* @uses remove_filter()
*
* @param string $hook_name Hook name.
* @param callable $callback Callback.
* @param int $priority Priority.
*
* @return bool
*/
public function remove_callback( $hook_name, $callback, $priority = 10 ) {
return remove_filter( $hook_name, $callback, $priority );
}
/**
* Remove an event subscriber.
*
* The event manager removes all the hooks that the given subscriber
* wants to register with the WordPress Plugin API.
*
* @param SubscriberInterface $subscriber SubscriberInterface implementation.
*/
public function remove_subscriber( SubscriberInterface $subscriber ) {
foreach ( $subscriber->get_subscribed_events() as $hook_name => $parameters ) {
$this->remove_subscriber_callback( $subscriber, $hook_name, $parameters );
}
}
/**
* Adds the given subscriber's callback to a specific hook
* of the WordPress plugin API.
*
* @param SubscriberInterface $subscriber SubscriberInterface implementation.
* @param string $hook_name Hook name.
* @param mixed $parameters Parameters, can be a string, an array or a multidimensional array.
*/
private function add_subscriber_callback( SubscriberInterface $subscriber, $hook_name, $parameters ) {
if ( is_string( $parameters ) ) {
$this->add_callback( $hook_name, [ $subscriber, $parameters ] );
} elseif ( is_array( $parameters ) && count( $parameters ) !== count( $parameters, COUNT_RECURSIVE ) ) {
foreach ( $parameters as $parameter ) {
$this->add_subscriber_callback( $subscriber, $hook_name, $parameter );
}
} elseif ( is_array( $parameters ) && isset( $parameters[0] ) ) {
$this->add_callback( $hook_name, [ $subscriber, $parameters[0] ], isset( $parameters[1] ) ? $parameters[1] : 10, isset( $parameters[2] ) ? $parameters[2] : 1 );
}
}
/**
* Removes the given subscriber's callback to a specific hook
* of the WordPress plugin API.
*
* @param SubscriberInterface $subscriber SubscriberInterface implementation.
* @param string $hook_name Hook name.
* @param mixed $parameters Parameters, can be a string, an array or a multidimensional array.
*/
private function remove_subscriber_callback( SubscriberInterface $subscriber, $hook_name, $parameters ) {
if ( is_string( $parameters ) ) {
$this->remove_callback( $hook_name, [ $subscriber, $parameters ] );
} elseif ( is_array( $parameters ) && count( $parameters ) !== count( $parameters, COUNT_RECURSIVE ) ) {
foreach ( $parameters as $parameter ) {
$this->remove_subscriber_callback( $subscriber, $hook_name, $parameter );
}
} elseif ( is_array( $parameters ) && isset( $parameters[0] ) ) {
$this->remove_callback( $hook_name, [ $subscriber, $parameters[0] ], isset( $parameters[1] ) ? $parameters[1] : 10 );
}
}
}

View File

@@ -1,14 +0,0 @@
<?php
namespace Imagify\EventManagement;
interface EventManagerAwareSubscriberInterface extends SubscriberInterface {
/**
* Set the WordPress event manager for the subscriber.
*
* @since 3.1
* @author Remy Perona
*
* @param EventManager $event_manager EventManager instance.
*/
public function set_event_manager( EventManager $event_manager );
}

View File

@@ -1,32 +0,0 @@
<?php
namespace Imagify\EventManagement;
/**
* A Subscriber knows what specific WordPress events it wants to listen to.
*
* When an EventManager adds a Subscriber, it gets all the WordPress events that
* it wants to listen to. It then adds the subscriber as a listener for each of them.
*
* @author Carl Alexander <contact@carlalexander.ca>
*/
interface SubscriberInterface {
/**
* Returns an array of events that this subscriber wants to listen to.
*
* The array key is the event name. The value can be:
*
* * The method name
* * An array with the method name and priority
* * An array with the method name, priority and number of accepted arguments
*
* For instance:
*
* * array('hook_name' => 'method_name')
* * array('hook_name' => array('method_name', $priority))
* * array('hook_name' => array('method_name', $priority, $accepted_args))
* * array('hook_name' => array(array('method_name_1', $priority_1, $accepted_args_1)), array('method_name_2', $priority_2, $accepted_args_2)))
*
* @return array
*/
public static function get_subscribed_events();
}