diff --git a/apachesolr.module b/apachesolr.module
index a9a7136..25568a8 100644
--- a/apachesolr.module
+++ b/apachesolr.module
@@ -1937,34 +1937,8 @@ function apachesolr_entity_fields($entity_type = 'node') {
   if (!isset($fields[$entity_type])) {
     $fields[$entity_type] = array();
 
-    $mappings = module_invoke_all('apachesolr_field_mappings');
-    foreach (array_keys($mappings) as $key) {
-      // Set all values with defaults.
-      $defaults = array(
-          'dependency plugins' => array('bundle', 'role'),
-          'map callback' => FALSE,
-          'name callback' => '',
-          'hierarchy callback' => FALSE,
-          'indexing_callback' => '',
-          'index_type' => 'string',
-          'facets' => FALSE,
-          'facet missing allowed' => FALSE,
-          'facet mincount allowed' => FALSE,
-          // Field API allows any field to be multi-valued.
-          'multiple' => TRUE,
-        );
-      if ($key !== 'per-field') {
-        $mappings[$key] += $defaults;
-      }
-      else {
-        foreach (array_keys($mappings[$key]) as $field_key) {
-          $mappings[$key][$field_key] += $defaults;
-        }
-      }
-    }
-
-    // Allow other modules to add or alter mappings.
-    drupal_alter('apachesolr_field_mappings', $mappings, $entity_type);
+    // Get the field mappings from apachesolr_field_mappings() implementations.
+    $mappings = apachesolr_get_field_mappings($entity_type);
 
     $modules = system_get_info('module');
     $instances = field_info_instances($entity_type);
@@ -2011,6 +1985,79 @@ function apachesolr_entity_fields($entity_type = 'node') {
 }
 
 /**
+ * Gets the Apache Solr field mappings.
+ *
+ * Field mappings define the various callbacks and Facet API keys associated
+ * with field types, i.e. "integer", "date", etc. Mappings are gathered by
+ * invoking hook_apachesolr_field_mappings().
+ *
+ * @param string $entity_type
+ *   The machine name of the entity mappings are being collected for.
+ *
+ * @return array
+ *   An associative array keyed by field type to an array of mappings
+ *   containing:
+ *   - dependency plugins: The Facet API dependency plugins associated with
+ *     fields of this type.
+ *   - map callback: The Facet API map callback that converts the raw values
+ *     stored in the index to something human readable.
+ *   - name callback: Callback used to modify the base name of the field as it
+ *     is stored in Solr. For example, the name callback cound change an integer
+ *     field from "field_foo" to "field_bar" so that it is stored in Solr as
+ *     "i_field_bar".
+ *   - hierarchy callback: The Facet API hierarchy processing callback for
+ *     hierarchical facets.
+ *   - indexing_callback: Callback used to retrieve values for indexing.
+ *   - index_type: The Solr datatype associated with this field type.
+ *   - facets: A boolean flagging whether facets are allowed for this field.
+ *   - facet missing allowed: A boolean flagging whether the Facet API "missing
+ *     facets" setting is supported by fields of this type.
+ *   - facet mincount allowed: A boolean flagging whether the Facet API "minimum
+ *     facet count" setting is supported by fields of this type.
+ *   - multiple: A boolean flagging whether the field contains multiple values.
+ *
+ * @see http://drupal.org/node/1825426
+ */
+function apachesolr_get_field_mappings($entity_type) {
+  $field_mappings = &drupal_static(__FUNCTION__, array());
+  if (!isset($field_mappings[$entity_type])) {
+
+    $field_mappings[$entity_type] = module_invoke_all('apachesolr_field_mappings');
+    $mappings = &$field_mappings[$entity_type];
+
+    foreach (array_keys($mappings) as $key) {
+      // Set all values with defaults.
+      $defaults = array(
+        'dependency plugins' => array('bundle', 'role'),
+        'map callback' => FALSE,
+        'name callback' => '',
+        'hierarchy callback' => FALSE,
+        'indexing_callback' => '',
+        'index_type' => 'string',
+        'facets' => FALSE,
+        'facet missing allowed' => FALSE,
+        'facet mincount allowed' => FALSE,
+        // Field API allows any field to be multi-valued.
+        'multiple' => TRUE,
+      );
+      if ($key !== 'per-field') {
+        $mappings[$key] += $defaults;
+      }
+      else {
+        foreach (array_keys($field_mappings[$key]) as $field_key) {
+          $mappings[$key][$field_key] += $defaults;
+        }
+      }
+    }
+
+    // Allow other modules to add or alter the field mappings.
+    drupal_alter('apachesolr_field_mappings', $mappings, $entity_type);
+  }
+
+  return $field_mappings[$entity_type];
+}
+
+/**
  * Implements hook_apachesolr_index_document_build().
  */
 function field_apachesolr_index_document_build(ApacheSolrDocument $document, $entity, $entity_type) {