Github user chaithu14 commented on a diff in the pull request:
https://github.com/apache/apex-malhar/pull/330#discussion_r73844368
--- Diff:
library/src/main/java/org/apache/apex/malhar/lib/state/managed/ManagedTimeStateMultiValue.java
---
@@ -0,0 +1,363 @@
+/**
+ * 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 org.apache.apex.malhar.lib.state.managed;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+import javax.annotation.Nullable;
+import javax.validation.constraints.NotNull;
+
+import org.apache.apex.malhar.lib.state.spillable.Spillable;
+
+import com.google.common.base.Preconditions;
+import com.google.common.collect.Multimap;
+import com.google.common.collect.Multiset;
+
+import com.datatorrent.api.StreamCodec;
+import com.datatorrent.lib.codec.KryoSerializableStreamCodec;
+import com.datatorrent.netlet.util.Slice;
+
+/**
+ * Concrete implementation of SpillableByteArrayListMultimap which is
needed for join operator.
+ *
+ * <b>Properties:</b><br>
+ * <b>isKeyContainsMultiValue</b>: Specifies whether the key has multiple
value or not. <br>
+ * <b>timeBucket</b>: Specifies the lenght of the time bucket.
+ *
+ */
+@org.apache.hadoop.classification.InterfaceStability.Evolving
+public class ManagedTimeStateMultiValue<K,V> implements
Spillable.SpillableByteArrayListMultimap<K,V>
+{
+ private transient StreamCodec streamCodec = null;
+ private boolean isKeyContainsMultiValue = false;
+ private long timeBucket;
+ @NotNull
+ private ManagedTimeStateImpl store;
+
+ public ManagedTimeStateMultiValue()
+ {
+ if (streamCodec == null) {
+ streamCodec = new KryoSerializableStreamCodec();
+ }
+ }
+
+ public ManagedTimeStateMultiValue(@NotNull ManagedTimeStateImpl store,
boolean isKeyContainsMultiValue)
+ {
+ this();
+ this.store = Preconditions.checkNotNull(store);
+ this.isKeyContainsMultiValue = isKeyContainsMultiValue;
+ }
+
+ /**
+ * Return the list of values from the store
+ * @param k given key
+ * @return list of values
+ */
+ @Override
+ public List<V> get(@Nullable K k)
+ {
+ List<V> value = null;
+ Slice valueSlice = store.getSync(getBucketId(k),
streamCodec.toByteArray(k));
+ if (valueSlice == null || valueSlice.length == 0 || valueSlice.buffer
== null) {
+ return null;
+ }
+ if (isKeyContainsMultiValue) {
+ return (List<V>)streamCodec.fromByteArray(valueSlice);
+ }
+ value = new ArrayList<>();
+ value.add((V)streamCodec.fromByteArray(valueSlice));
+ return value;
+ }
+
+ /**
+ * Returns the Future form the store.
+ * @param k given key
+ * @return
+ */
+ public CompositeFuture getAsync(@Nullable K k)
+ {
+ return new CompositeFuture(store.getAsync(getBucketId(k),
streamCodec.toByteArray(k)));
+ }
+
+ @Override
+ public Set<K> keySet()
+ {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public Multiset<K> keys()
+ {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public Collection<V> values()
+ {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public Collection<Map.Entry<K, V>> entries()
+ {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public List<V> removeAll(@Nullable Object o)
+ {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void clear()
+ {
+
+ }
+
+ @Override
+ public int size()
+ {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public boolean isEmpty()
+ {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public boolean containsKey(@Nullable Object o)
+ {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public boolean containsValue(@Nullable Object o)
+ {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public boolean containsEntry(@Nullable Object o, @Nullable Object o1)
+ {
+ throw new UnsupportedOperationException();
+ }
+
+ /**
+ * Inserts the (k,v) into the store.
+ * @param k key
+ * @param v value
+ * @return true if the given (k,v) is successfully inserted into the
store otherwise false.
+ */
+ @Override
+ public boolean put(@Nullable K k, @Nullable V v)
+ {
+ if (isKeyContainsMultiValue) {
+ Slice keySlice = streamCodec.toByteArray(k);
+ int bucketId = getBucketId(k);
+ Slice valueSlice = store.getSync(bucketId, keySlice);
+ List<V> listOb;
+ if (valueSlice == null || valueSlice.length == 0) {
+ listOb = new ArrayList<>();
+ } else {
+ listOb = (List<V>)streamCodec.fromByteArray(valueSlice);
+ }
+ listOb.add(v);
+ return insertInStore(bucketId, timeBucket, keySlice,
streamCodec.toByteArray(listOb));
+ }
+ return insertInStore(getBucketId(k), timeBucket,
streamCodec.toByteArray(k),streamCodec.toByteArray(v));
+ }
+
+ /**
+ * Inserts the (k,v) into the store using the specified timebucket.
+ * @param k key
+ * @param v value
+ * @param timeBucket timebucket
+ * @return true if the given (k,v) is successfully inserted into the
store otherwise false.
+ */
+ public boolean put(@Nullable K k, @Nullable V v, long timeBucket)
+ {
+ if (isKeyContainsMultiValue) {
+ Slice keySlice = streamCodec.toByteArray(k);
+ int bucketId = getBucketId(k);
+ Slice valueSlice = store.getSync(bucketId, keySlice);
+ List<V> listOb;
+ if (valueSlice == null || valueSlice.length == 0) {
+ listOb = new ArrayList<>();
+ } else {
+ listOb = (List<V>)streamCodec.fromByteArray(valueSlice);
+ }
+ listOb.add(v);
+ return insertInStore(bucketId, timeBucket, keySlice,
streamCodec.toByteArray(listOb));
+ }
+ return insertInStore(getBucketId(k), timeBucket,
streamCodec.toByteArray(k),streamCodec.toByteArray(v));
+ }
+
+ /**
+ * Insert (keySlice,valueSlice) into the store using bucketId and
timeBucket.
+ * @param bucketId bucket Id
+ * @param timeBucket time bucket
+ * @param keySlice key slice
+ * @param valueSlice value slice
+ * @return true if the given (keySlice,valueSlice) is successfully
inserted into the
+ * store otherwise false.
+ */
+ public boolean insertInStore(long bucketId, long timeBucket, Slice
keySlice, Slice valueSlice)
+ {
+ long timeBucketId =
store.getTimeBucketAssigner().getTimeBucketFor(timeBucket);
+ if (timeBucketId != -1) {
+ store.putInBucket(bucketId, timeBucketId, keySlice, valueSlice);
+ return true;
+ }
+ return false;
+ }
+
+ @Override
+ public boolean remove(@Nullable Object o, @Nullable Object o1)
+ {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public boolean putAll(@Nullable K k, Iterable<? extends V> iterable)
+ {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public boolean putAll(Multimap<? extends K, ? extends V> multimap)
+ {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public List<V> replaceValues(K k, Iterable<? extends V> iterable)
+ {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public Map<K, Collection<V>> asMap()
+ {
+ throw new UnsupportedOperationException();
+ }
+
+ public int getBucketId(K k)
+ {
+ return k.hashCode() % store.getNumBuckets();
+ }
+
+
+ public boolean isKeyContainsMultiValue()
--- End diff --
Done.
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