--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/servlib/bundling/BundleInfoCache.h	Thu Apr 21 14:57:45 2011 +0100
@@ -0,0 +1,67 @@
+/*
+ *    Copyright 2007-2008 Intel Corporation
+ * 
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ * 
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+#ifndef _BUNDLEINFOCACHE_H_
+#define _BUNDLEINFOCACHE_H_
+
+#include <oasys/debug/Logger.h>
+#include <oasys/util/Cache.h>
+#include <oasys/util/CacheCapacityHelper.h>
+#include "Bundle.h"
+#include "GbofId.h"
+
+namespace dtn {
+
+/**
+ * Utility class for maintain a cache of recently received bundles,
+ * indexed by GbofId. Used for routers to detect redundant BundleInfos
+ * and to avoid duplicate deliveries to registrations.
+ */
+class BundleInfoCache {
+public:
+    /**
+     * Constructor that takes the logpath and the number of entries to
+     * maintain in the cache.
+     */
+    BundleInfoCache(const std::string& logpath, size_t capacity);
+    
+    /**
+     * Try to add the bundle to the cache. If it already exists in the
+     * cache, adding it again fails, and the method returns false.
+     */
+    bool add_entry(const Bundle* bundle, const EndpointID& prevhop);
+
+    /**
+     * Check if the given bundle is in the cache, returning the EID of
+     * the node from which it arrived (if known).
+     */
+    bool lookup(const Bundle* bundle, EndpointID* prevhop);
+
+    /**
+     * Flush the cache.
+     */
+    void evict_all();
+
+protected:
+    typedef oasys::CacheCapacityHelper<GbofId, EndpointID> CacheCapacityHelper;
+    typedef oasys::Cache<GbofId, EndpointID, CacheCapacityHelper> Cache;
+    Cache cache_;
+};
+
+} // namespace dtn
+
+
+#endif /* _BUNDLEINFOCACHE_H_ */