From 647bae40207b73c0b1b527eb83b8b614d29497eb Mon Sep 17 00:00:00 2001
From: Erik Forkalsrud <erik@forkalsrud.org>
Date: Sat, 17 Jan 2009 17:22:56 -0800
Subject: [PATCH] add last-modified headers add flush() at end of scaleImage()

---
 src/org/forkalsrud/album/web/AlbumServlet.java | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/org/forkalsrud/album/web/AlbumServlet.java b/src/org/forkalsrud/album/web/AlbumServlet.java
index 2fb6925..39414dd 100644
--- a/src/org/forkalsrud/album/web/AlbumServlet.java
+++ b/src/org/forkalsrud/album/web/AlbumServlet.java
@@ -128,13 +128,26 @@ public class AlbumServlet
         return false;
     }
 
+    boolean notModified(HttpServletRequest req, File f) {
+        long reqDate = req.getDateHeader("If-Modified-Since");
+        long fDate = f.lastModified();
+        return reqDate > 0 && fDate > 0 && fDate <= reqDate;
+    }
+
     synchronized void scaleImage(HttpServletRequest req, HttpServletResponse res, File file, Thumbnail thumbnail, String size) throws IOException {
 
+        if (notModified(req, file)) {
+            res.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
+            System.out.println(file.getName() + " not modified (based on date)");
+            return;
+        }
         String fileEtag = thumbnail.getEtag() + "-" + size;
         if (etagMatches(req, fileEtag)) {
             res.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
+            System.out.println(file.getName() + " not modified (based on etag)");
             return;
         }
+        res.setDateHeader("Last-Modified", file.lastModified());
         res.setHeader("ETag", fileEtag);
 
         Dimension orig = thumbnail.getSize();
@@ -213,6 +226,8 @@ public class AlbumServlet
         writer.setOutput(ios);
 //        writer.write(null, new IIOImage(buf2, null, null), wParam);
         writer.write(buf2);
+        ios.flush();
+        res.getOutputStream().close();
     }