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<?php |
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/** |
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* A buffer of items from the queue that can be checked out |
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*/ |
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class Jetpack_Sync_Queue_Buffer { |
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public $items; |
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public $id; |
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public function __construct( $items ) { |
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$this->id = uniqid(); |
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$this->items = $items; |
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} |
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} |
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/** |
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* A persistent queue that can be flushed in increments of N items, |
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* and which blocks reads until checked-out buffers are checked in or |
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* closed |
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*/ |
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class Jetpack_Sync_Queue { |
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public $id; |
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private $items = array(); |
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private $checkout = null; |
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private $checkout_size = 10; |
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function __construct( $id ) { |
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$this->id = $id; |
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} |
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function add( $item ) { |
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$this->items[] = $item; |
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} |
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function add_all( $items ) { |
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$this->items += $items; |
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} |
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function size() { |
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return count( $this->items ); |
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} |
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function checkout() { |
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if ( $this->checkout ) { |
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return new WP_Error( 'unclosed_buffer', 'There is an unclosed buffer' ); |
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} |
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$buffer = new Jetpack_Sync_Queue_Buffer( array_slice( $this->items, 0, $this->checkout_size ) ); |
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$this->checkout = $buffer; |
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return $buffer; |
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} |
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function checkin( $buffer ) { |
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$is_valid = $this->validate_checkout( $buffer ); |
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if ( is_wp_error( $is_valid ) ) { |
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return $is_valid; |
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} |
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$this->checkout = null; |
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return true; |
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} |
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function close( $buffer ) { |
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$is_valid = $this->validate_checkout( $buffer ); |
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if ( is_wp_error( $is_valid ) ) { |
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return $is_valid; |
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} |
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$this->checkout = null; |
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$this->items = array_slice( $this->items, count( $buffer->items ) ); |
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return true; |
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} |
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function flush_all() { |
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$items_reference = $this->items; |
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$this->items = array(); |
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return $items_reference; |
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} |
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function set_checkout_size( $new_size ) { |
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$this->checkout_size = $new_size; |
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} |
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private function validate_checkout( $buffer ) { |
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if ( ! $buffer instanceof Jetpack_Sync_Queue_Buffer ) { |
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return new WP_Error( 'not_a_buffer', 'You must checkin an instance of Jetpack_Sync_Queue_Buffer' ); |
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} |
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if ( !$this->checkout ) { |
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return new WP_Error( 'buffer_not_checked_out', 'There are no checked out buffers' ); |
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} |
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if ( $this->checkout->id != $buffer->id ) { |
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return new WP_Error( 'buffer_mismatch', 'The buffer you checked in was not checked out' ); |
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} |
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return true; |
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} |
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} |
Automattic /
jetpack
Having each class in a dedicated file usually plays nice with PSR autoloaders and is therefore a well established practice. If you use other autoloaders, you might not want to follow this rule.