Add some hooks to cache the queries and retrieve them.

Author: ryanwelcher

includes/query-loop.php

@@ -163,3 +163,43 @@ function add_custom_query_params( $args, $request ) {
 
 	return $merged;
 }
+
+
+
+/**
+ * Retrieve any cached AQL instances and bypass making a query.
+ */
+add_filter(
+	'posts_pre_query',
+	function ( $null_return, $query ) {
+		if ( isset( $query->query['is_aql'] ) ) {
+			$cached_query = get_transient( $query->query_vars_hash );
+			if ( $cached_query ) {
+				$query->found_posts   = $cached_query->found_posts;
+				$query->max_num_pages = $cached_query->max_num_pages;
+				return $cached_query->posts;
+			}
+			return $null_return;
+		}
+		return $null_return;
+	},
+	10,
+	2
+);
+
+/**
+ * Create a cache for the Query generated by the AQL instance.
+ */
+add_filter(
+	'the_posts',
+	function ( $posts, $query ) {
+		if ( isset( $query->query['is_aql'] ) ) {
+			if ( ! get_transient( $query->query_vars_hash ) ) {
+				set_transient( $query->query_vars_hash, $query, HOUR_IN_SECONDS );
+			}
+		}
+		return $posts;
+	},
+	10,
+	2
+);