--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/fschmidt/util/servlet/MemCache.java	Sun Oct 05 17:24:15 2025 -0600
@@ -0,0 +1,77 @@
+/*
+Copyright (c) 2008  Franklin Schmidt <fschmidt@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+package fschmidt.util.servlet;
+
+import java.util.Map;
+import java.util.Collections;
+import fschmidt.db.util.WeakCacheMap;
+
+
+public final class MemCache implements HttpCache {
+	private final HttpCache cache;
+	private final Map<String,Long> map = Collections.synchronizedMap(new WeakCacheMap<String,Long>());
+
+	public MemCache(HttpCache cache) {
+		this.cache = cache;
+	}
+
+	public long[] lastModifieds(String[] modifyingEvents) {
+		long[] rtn = new long[modifyingEvents.length];
+		int[] missed = new int[modifyingEvents.length];
+		int nMissed = 0;
+		for( int i=0; i<modifyingEvents.length; i++ ) {
+			Object modifyingEvent = modifyingEvents[i];
+			Long r = map.get(modifyingEvent);
+			if( r!=null ) {
+				rtn[i] = r.longValue();
+			} else {
+				missed[nMissed++] = i;
+			}
+		}
+		if( nMissed > 0 ) {
+			String[] aS = new String[nMissed];
+			for( int i=0; i<nMissed; i++ ) {
+				aS[i] = modifyingEvents[missed[i]];
+			}
+			long[] aL = cache.lastModifieds(aS);
+			for( int i=0; i<nMissed; i++ ) {
+				int iMissed = missed[i];
+				long lastModified = aL[i];
+				rtn[iMissed] = lastModified;
+				map.put(modifyingEvents[iMissed],new Long(lastModified));
+			}
+		}
+		return rtn;
+	}
+
+	public void modified(String modifyingEvent) {
+		cache.modified(modifyingEvent);
+		map.remove(modifyingEvent);
+	}
+
+	public void clear() {
+		cache.clear();
+		map.clear();
+	}
+
+}