Github user gauravgopi123 commented on a diff in the pull request:
https://github.com/apache/incubator-apex-malhar/pull/113#discussion_r45863234
--- Diff: library/src/main/java/com/datatorrent/lib/join/BackupStore.java
---
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2014 DataTorrent, Inc. ALL Rights Reserved.
+ *
+ * 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.
+ */
+package com.datatorrent.lib.join;
+
+import org.apache.hadoop.classification.InterfaceStability.Evolving;
+
+/**
+ * <p>
+ * Interface of store for join operation.
+ * </p>
+ */
+@Evolving
+public interface BackupStore
+{
+ /**
+ * Generate the store
+ */
+ void setup();
+
+ void committed(long windowId);
+
+ void checkpointed(long windowId);
+
+ void endWindow();
+
+ /**
+ * Get the key from the given tuple and with that key, get the tuples
which satisfies the join constraint
+ * from the store.
+ *
+ * @param tuple Given tuple
+ * @return the valid tuples which statisfies the join constraint
+ */
+ Object getValidTuples(Object tuple);
--- End diff --
why is this object and not List<TimeEvent>??
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