Github user bhupeshchawda commented on a diff in the pull request:
https://github.com/apache/apex-malhar/pull/330#discussion_r72218447
--- Diff:
library/src/main/java/com/datatorrent/lib/join/AbstractManagedStateInnerJoinOperator.java
---
@@ -0,0 +1,265 @@
+/**
+ * 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.join;
+
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+
+import org.joda.time.Duration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.apache.apex.malhar.lib.state.managed.ManagedTimeStateImpl;
+import org.apache.apex.malhar.lib.state.managed.ManagedTimeStateMultiValue;
+import org.apache.apex.malhar.lib.state.spillable.Spillable;
+import org.apache.hadoop.fs.Path;
+import com.google.common.collect.Maps;
+import com.datatorrent.api.Context;
+import com.datatorrent.api.DAG;
+import com.datatorrent.api.Operator;
+import com.datatorrent.lib.fileaccess.FileAccessFSImpl;
+
+/**
+ * An abstract implementation of inner join operator over Managed state
which extends from
+ * AbstractInnerJoinOperator.
+ *
+ * <b>Properties:</b><br>
+ * <b>noOfBuckets</b>: Number of buckets required for Managed state. <br>
+ * <b>bucketSpanTime</b>: Indicates the length of the time bucket. <br>
+ */
+public abstract class AbstractManagedStateInnerJoinOperator<K,T> extends
AbstractInnerJoinOperator<K,T> implements
+ Operator.CheckpointNotificationListener,
Operator.CheckpointListener,Operator.IdleTimeHandler
+{
+ private static final transient Logger LOG =
LoggerFactory.getLogger(AbstractManagedStateInnerJoinOperator.class);
+ public static final String stateDir = "managedState";
+ public static final String stream1State = "stream1Data";
+ public static final String stream2State = "stream2Data";
+ private transient long sleepMillis;
+ private transient Map<JoinEvent<K,T>, Future<List>> waitingEvents =
Maps.newLinkedHashMap();
+ private int noOfBuckets = 1;
+ private Long bucketSpanTime;
+ protected ManagedTimeStateImpl stream1Store;
+ protected ManagedTimeStateImpl stream2Store;
+
+ /**
+ * Create Managed states and stores for both the streams.
+ */
+ @Override
+ public void createStores()
+ {
+ stream1Store = new ManagedTimeStateImpl();
+ stream2Store = new ManagedTimeStateImpl();
+ stream1Store.setNumBuckets(noOfBuckets);
+ stream2Store.setNumBuckets(noOfBuckets);
+ if (bucketSpanTime != null) {
--- End diff --
I will suggest making bucketSpanTime as well as the expiryTimes to be made
mandatory. Reason is that if a user forgot to set one of these, there could be
issues.
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