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From ilooner <...@git.apache.org>
Subject [GitHub] apex-malhar pull request #324: Spillable Datastructures PR for review only
Date Sun, 07 Aug 2016 21:18:48 GMT
Github user ilooner commented on a diff in the pull request:

    https://github.com/apache/apex-malhar/pull/324#discussion_r73809225
  
    --- Diff: library/src/main/java/org/apache/apex/malhar/lib/state/spillable/SpillableByteArrayListMultimapImpl.java
---
    @@ -0,0 +1,292 @@
    +/**
    + * 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.spillable;
    +
    +import java.util.Collection;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.Set;
    +
    +import javax.annotation.Nullable;
    +import javax.validation.constraints.NotNull;
    +
    +import org.apache.apex.malhar.lib.utils.serde.PassThruByteArraySliceSerde;
    +import org.apache.apex.malhar.lib.utils.serde.Serde;
    +import org.apache.apex.malhar.lib.utils.serde.SerdeIntSlice;
    +import org.apache.apex.malhar.lib.utils.serde.SliceUtils;
    +
    +import com.esotericsoftware.kryo.DefaultSerializer;
    +import com.esotericsoftware.kryo.serializers.FieldSerializer;
    +import com.google.common.base.Preconditions;
    +import com.google.common.collect.Multimap;
    +import com.google.common.collect.Multiset;
    +
    +import com.datatorrent.api.Context;
    +import com.datatorrent.netlet.util.Slice;
    +
    +/**
    + * Created by tfarkas on 6/12/16.
    + */
    +@DefaultSerializer(FieldSerializer.class)
    +public class SpillableByteArrayListMultimapImpl<K, V> implements Spillable.SpillableByteArrayListMultimap<K,
V>,
    +    Spillable.SpillableComponent
    +{
    +  public static final int DEFAULT_BATCH_SIZE = 1000;
    +  public static final byte[] SIZE_KEY_SUFFIX = new byte[]{(byte)0, (byte)0, (byte)0};
    +
    +  private transient WindowBoundedMapCache<K, SpillableArrayListImpl<V>> cache
= new WindowBoundedMapCache<>();
    +  private transient boolean isRunning = false;
    +  private transient boolean isInWindow = false;
    +
    +  private int batchSize = DEFAULT_BATCH_SIZE;
    +  @NotNull
    +  private SpillableByteMapImpl<byte[], Integer> map;
    +  private SpillableStateStore store;
    +  private byte[] identifier;
    +  private long bucket;
    +  private Serde<K, Slice> serdeKey;
    +  private Serde<V, Slice> serdeValue;
    +
    +  private SpillableByteArrayListMultimapImpl()
    +  {
    +    // for kryo
    +  }
    +
    +  public SpillableByteArrayListMultimapImpl(SpillableStateStore store, byte[] identifier,
long bucket,
    +      Serde<K, Slice> serdeKey,
    +      Serde<V, Slice> serdeValue)
    +  {
    +    this.store = Preconditions.checkNotNull(store);
    +    this.identifier = Preconditions.checkNotNull(identifier);
    +    this.bucket = bucket;
    +    this.serdeKey = Preconditions.checkNotNull(serdeKey);
    +    this.serdeValue = Preconditions.checkNotNull(serdeValue);
    +
    +    map = new SpillableByteMapImpl(store, identifier, bucket, new PassThruByteArraySliceSerde(),
new SerdeIntSlice());
    +  }
    +
    +  public SpillableStateStore getStore()
    +  {
    +    return store;
    +  }
    +
    +  @Override
    +  public List<V> get(@Nullable K key)
    +  {
    +    return getHelper(key);
    +  }
    +
    +  private SpillableArrayListImpl<V> getHelper(@Nullable K key)
    +  {
    +    SpillableArrayListImpl<V> spillableArrayList = cache.get(key);
    +
    +    if (spillableArrayList == null) {
    +      Slice keySlice = serdeKey.serialize(key);
    +      Integer size = map.get(SliceUtils.concatenate(keySlice, SIZE_KEY_SUFFIX).toByteArray());
    --- End diff --
    
    @davidyan74 no the Spillable map prefixes each key with its identifier internally. It
is not necessary for you to manually prefix the keys yourself.


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