Make OAI-PMH page size configurable

config/vufind/config.ini

@@ -1170,6 +1170,10 @@ url             = https://www.myendnoteweb.com/EndNoteWeb.html
 ;
 ; If admin_email is not set, the main email under [Site] will be used instead.
 ;
+; page_size may be used to specify the number of records returned per request.
+; Default is 100. A higher number may improve overall harvesting performance, but
+; will also make a single response page larger and slower to produce.
+;
 ; If set_field is set, the named Solr field will be used to generate sets on
 ; your OAI-PMH server.  If it is not set, sets will not be supported.
 ;
@@ -1194,6 +1198,7 @@ url             = https://www.myendnoteweb.com/EndNoteWeb.html
 ;identifier       = myuniversity.edu
 ;repository_name  = "MyUniversity Catalog"
 ;admin_email      = oai@myuniversity.edu
+;page_size        = 1000
 ;set_field        = "format"
 ;set_query['eod_books'] = "institution:kfu AND publishDate:[1911 TO 1911]"
 ;set_query['eod_ebooks'] = "format:eBook"

module/VuFind/src/VuFind/OAI/Server.php

@@ -640,6 +640,11 @@ class Server
             $this->idNamespace = $config->OAI->identifier;
         }
 
+        // Override page size if configured:
+        if (isset($config->OAI->page_size)) {
+            $this->pageSize = $config->OAI->page_size;
+        }
+
         // Use either OAI-specific or general email address; we must have SOMETHING.
         $this->adminEmail = isset($config->OAI->admin_email) ?
             $config->OAI->admin_email : $config->Site->email;