Use fine grained locking for Date/Time parsing until OF-609 is fixed.

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@13469 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/util/XMPPDateTimeFormat.java

@@ -95,7 +95,7 @@ public class XMPPDateTimeFormat {
      * @return
      * @throws ParseException
      */
-    public synchronized Date parseString(String dateString) throws ParseException {
+    public Date parseString(String dateString) throws ParseException {
         Matcher xep82WoMillisMatcher = xep80DateTimePattern.matcher(dateString);
         Matcher xep82Matcher = xep80DateTimeWoMillisPattern.matcher(dateString);
 
@@ -115,15 +115,21 @@ public class XMPPDateTimeFormat {
             }
 
             if (xep82WoMillisMatcher.matches()) {
+                synchronized (dateTimeFormatWoMillies) {
                     return dateTimeFormatWoMillies.parse(rfc822Date);
+                }
             } else {
+                synchronized (dateTimeFormat) {
                     return dateTimeFormat.parse(rfc822Date);
                 }
+            }
         } else {
             // at last try with the legacy format
+            synchronized (dateTimeFormatOld) {
                 return dateTimeFormatOld.parse(dateString);
             }
         }
+    }
 
     /**
      * Tries to convert a given string to a Date object.
@@ -133,9 +139,11 @@ public class XMPPDateTimeFormat {
      * @return
      * @throws ParseException
      */
-    public synchronized Date parseOldDate(String dateStr) throws ParseException {
+    public Date parseOldDate(String dateStr) throws ParseException {
+        synchronized (dateTimeFormatOld) {
             return dateTimeFormatOld.parse(dateStr);
         }
+    }
 
     /**
      * Formats a Date object to String as defined in XEP-0082.