1 files changed, 48 insertions, 0 deletions
diff --git a/swarm/storage/feed/cacheentry.go b/swarm/storage/feed/cacheentry.go
new file mode 100644
index 000000000..be42008e9
--- /dev/null
+++ b/swarm/storage/feed/cacheentry.go
@@ -0,0 +1,48 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package feed
+
+import (
+	"bytes"
+	"context"
+	"time"
+
+	"github.com/ethereum/go-ethereum/swarm/storage"
+)
+
+const (
+	hasherCount            = 8
+	feedsHashAlgorithm     = storage.SHA3Hash
+	defaultRetrieveTimeout = 100 * time.Millisecond
+)
+
+// cacheEntry caches the last known update of a specific Swarm feed.
+type cacheEntry struct {
+	Update
+	*bytes.Reader
+	lastKey storage.Address
+}
+
+// implements storage.LazySectionReader
+func (r *cacheEntry) Size(ctx context.Context, _ chan bool) (int64, error) {
+	return int64(len(r.Update.data)), nil
+}
+
+//returns the feed's topic
+func (r *cacheEntry) Topic() Topic {
+	return r.Feed.Topic
+}