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core/src/main/java/org/apache/spark/unsafe/sort/UnsafeExternalSortSpillMerger.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.spark.unsafe.sort; | ||
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| import java.util.Comparator; | ||
| import java.util.Iterator; | ||
| import java.util.PriorityQueue; | ||
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| import static org.apache.spark.unsafe.sort.UnsafeSorter.*; | ||
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| public final class UnsafeExternalSortSpillMerger { | ||
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| private final PriorityQueue<MergeableIterator> priorityQueue; | ||
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| public static abstract class MergeableIterator { | ||
| public abstract boolean hasNext(); | ||
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| public abstract void advanceRecord(); | ||
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| public abstract long getPrefix(); | ||
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| public abstract Object getBaseObject(); | ||
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| public abstract long getBaseOffset(); | ||
| } | ||
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| public static final class RecordAddressAndKeyPrefix { | ||
| public Object baseObject; | ||
| public long baseOffset; | ||
| public int recordLength; | ||
| public long keyPrefix; | ||
| } | ||
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| public UnsafeExternalSortSpillMerger( | ||
| final RecordComparator recordComparator, | ||
| final UnsafeSorter.PrefixComparator prefixComparator) { | ||
| final Comparator<MergeableIterator> comparator = new Comparator<MergeableIterator>() { | ||
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| @Override | ||
| public int compare(MergeableIterator left, MergeableIterator right) { | ||
| final int prefixComparisonResult = | ||
| prefixComparator.compare(left.getPrefix(), right.getPrefix()); | ||
| if (prefixComparisonResult == 0) { | ||
| return recordComparator.compare( | ||
| left.getBaseObject(), left.getBaseOffset(), | ||
| right.getBaseObject(), right.getBaseOffset()); | ||
| } else { | ||
| return prefixComparisonResult; | ||
| } | ||
| } | ||
| }; | ||
| priorityQueue = new PriorityQueue<MergeableIterator>(10, comparator); | ||
| } | ||
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| public void addSpill(MergeableIterator spillReader) { | ||
| priorityQueue.add(spillReader); | ||
| } | ||
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| public Iterator<RecordAddressAndKeyPrefix> getSortedIterator() { | ||
| return new Iterator<RecordAddressAndKeyPrefix>() { | ||
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| private MergeableIterator spillReader; | ||
| private final RecordAddressAndKeyPrefix record = new RecordAddressAndKeyPrefix(); | ||
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| @Override | ||
| public boolean hasNext() { | ||
| return spillReader.hasNext() || !priorityQueue.isEmpty(); | ||
| } | ||
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| @Override | ||
| public RecordAddressAndKeyPrefix next() { | ||
| if (spillReader != null) { | ||
| if (spillReader.hasNext()) { | ||
| priorityQueue.add(spillReader); | ||
| } | ||
| } | ||
| spillReader = priorityQueue.poll(); | ||
| record.baseObject = spillReader.getBaseObject(); | ||
| record.baseOffset = spillReader.getBaseOffset(); | ||
| record.keyPrefix = spillReader.getPrefix(); | ||
| return record; | ||
| } | ||
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| @Override | ||
| public void remove() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
| }; | ||
| } | ||
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| } |
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