Github user amberarrow commented on a diff in the pull request:
https://github.com/apache/incubator-apex-malhar/pull/145#discussion_r56765265
--- Diff:
library/src/main/java/com/datatorrent/lib/state/BucketedState.java ---
@@ -0,0 +1,69 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.state;
+
+import java.util.concurrent.Future;
+
+import com.datatorrent.netlet.util.Slice;
+
+/**
+ * A state where keys are grouped in buckets.
+ */
+public interface BucketedState
+{
+ /**
+ * An expired value. In some implementations where bucketId is time
related then the event can be old and
+ * the get methods- getSync & getAsync return this fixed slice
instance.<br/>
+ * In the usages, comparisons with EXPIRED should be made using
<code>==</code> instead of <code>equals</code>.
+ */
+ Slice EXPIRED = new Slice(null, -1, -1);
+
+ /**
+ * Sets the value of the key in bucket identified by bucketId.
+ *
+ * @param bucketId identifier of the bucket.
+ * @param key key
+ * @param value value
+ */
--- End diff --
value => value (must not be null)
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