1 files changed, 8 insertions, 2 deletions
diff --git a/src/support/dom/document_cache.h b/src/support/dom/document_cache.h
index 287a316..af99102 100644
--- a/src/support/dom/document_cache.h
+++ b/src/support/dom/document_cache.h
@@ -1,8 +1,11 @@
 #ifndef INPUTXSLT_SRC_SUPPORT_DOM_DOCUMENT_CACHE_H_
 #define INPUTXSLT_SRC_SUPPORT_DOM_DOCUMENT_CACHE_H_
 
-#include <unordered_map>
+#include <xercesc/dom/DOMDocument.hpp>
+
 #include <string>
+#include <mutex>
+#include <unordered_map>
 #include <memory>
 
 namespace InputXSLT {
@@ -10,12 +13,15 @@ namespace InputXSLT {
 class DomDocumentCache {
 	public:
 		class item;
+		typedef std::pair<bool, item*> optional_item;
 
 		DomDocumentCache();
 
-		item* get(const std::string&);
+		optional_item get(const std::string&);
+		optional_item create(const std::string&, xercesc::DOMDocument*);
 
 	private:
+		std::mutex write_mutex_;
 		std::unordered_map<std::string, std::unique_ptr<item>> map_;
 
 };