X-Git-Url: https://juplo.de/gitweb/?p=percentcodec;a=blobdiff_plain;f=cachecontrol%2Fsrc%2Fmain%2Fjava%2Fde%2Fhalbekunst%2Fjuplo%2Fcachecontrol%2FAcceleratorFilter.java;h=8e63222abfb185e7e3bb2b4b5e889c8304b66b6e;hp=e881a8ed82c71e5021b4df290ed98a37d0e7d6bf;hb=2debc69d4dcf8618c2fc06aa0633fabbf4f98f52;hpb=9f7a8c23d565e8317d03d5916e0ba70cf632d1ba

diff --git a/cachecontrol/src/main/java/de/halbekunst/juplo/cachecontrol/AcceleratorFilter.java b/cachecontrol/src/main/java/de/halbekunst/juplo/cachecontrol/AcceleratorFilter.java
index e881a8ed..8e63222a 100644
--- a/cachecontrol/src/main/java/de/halbekunst/juplo/cachecontrol/AcceleratorFilter.java
+++ b/cachecontrol/src/main/java/de/halbekunst/juplo/cachecontrol/AcceleratorFilter.java
@@ -64,7 +64,25 @@ public class AcceleratorFilter implements Filter {
 
     HttpServletRequest httpRequest = (HttpServletRequest)request;
     HttpServletResponse httpResponse = (HttpServletResponse)response;
-    AccelerationWrapper wrapper = new AccelerationWrapper(httpRequest, httpResponse);
+
+    AccelerationWrapper wrapper;
+
+    wrapper = (AccelerationWrapper)request.getAttribute(AcceleratorFilter.RESPONSE_WRAPPER);
+    if (wrapper != null) {
+      if (wrapper.getFilter() == this) {
+        /** Ignore multiple mappings of the same filter-instance */
+        log.warn("Ignoring multiple mappings on same URL: {}", httpRequest.getRequestURI());
+        chain.doFilter(request, response);
+        return;
+      }
+      else {
+        log.error("Only one instance of AcceleratorFilter must be mapped to any URL: {}", httpRequest.getRequestURI());
+        httpResponse.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Only one instance of AcceleratorFilter must be mapped to any URL!");
+        return;
+      }
+    }
+
+    wrapper = new AccelerationWrapper(httpRequest, httpResponse);
     httpRequest.setAttribute(RESPONSE_WRAPPER, wrapper);
     cacheControl.init(wrapper);
     try {
@@ -143,6 +161,10 @@ public class AcceleratorFilter implements Filter {
     }
 
 
+    private AcceleratorFilter getFilter() {
+      return AcceleratorFilter.this;
+    }
+
     private void finish() throws IOException {
       flushBuffer();
       out.close();