From f5838ab6036181d864be96a180e00b7295d5f497 Mon Sep 17 00:00:00 2001
From: Bernhard Haumacher <haui@haumacher.de>
Date: Thu, 25 Jun 2015 17:36:41 +0200
Subject: [PATCH] Prevent multiple initializations of the Thymeleaf template
 engine. Initializing the template engine is a costly operation, because this
 drops the resolved templates. When initializing the template engine for each
 page, all used templates must be resolved for each rendering operation. This
 greatly reduces rendering performance. Instead, only re-initialize the
 template engine, if the template mode changes.

---
 .../org/jbake/template/ThymeleafTemplateEngine.java | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/main/java/org/jbake/template/ThymeleafTemplateEngine.java b/src/main/java/org/jbake/template/ThymeleafTemplateEngine.java
index cbcaa73a3..935e67dc7 100644
--- a/src/main/java/org/jbake/template/ThymeleafTemplateEngine.java
+++ b/src/main/java/org/jbake/template/ThymeleafTemplateEngine.java
@@ -49,15 +49,21 @@ public class ThymeleafTemplateEngine extends AbstractTemplateEngine {
     private TemplateEngine templateEngine;
     private FileTemplateResolver templateResolver;
 
+	private String templateMode;
+
     public ThymeleafTemplateEngine(final CompositeConfiguration config, final ContentStore db, final File destination, final File templatesPath) {
         super(config, db, destination, templatesPath);
-        initializeTemplateEngine();
     }
 
-    private void initializeTemplateEngine() {
+    private void initializeTemplateEngine(String mode) {
+    	if (mode.equals(templateMode)) {
+    		return;
+    	}
+        templateMode = mode;
         templateResolver = new FileTemplateResolver();
         templateResolver.setPrefix(templatesPath.getAbsolutePath() + File.separatorChar);
         templateResolver.setCharacterEncoding(config.getString(Keys.TEMPLATE_ENCODING));
+        templateResolver.setTemplateMode(mode);
         templateEngine = new TemplateEngine();
         templateEngine.setTemplateResolver(templateResolver);
         try {
@@ -75,7 +81,6 @@ public void renderDocument(final Map<String, Object> model, final String templat
         Context context = new Context(locale, wrap(model));
         lock.lock();
         try {
-        	initializeTemplateEngine();
             @SuppressWarnings("unchecked")
             Map<String, Object> config = (Map<String, Object>) model.get("config");
             @SuppressWarnings("unchecked")
@@ -88,7 +93,7 @@ public void renderDocument(final Map<String, Object> model, final String templat
                     mode = configMode;
                 }
             }
-            templateResolver.setTemplateMode(mode);
+            initializeTemplateEngine(mode);
             templateEngine.process(templateName, context, writer);
         } finally {
             lock.unlock();