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61 changes: 61 additions & 0 deletions
61
lucene/core/src/java/org/apache/lucene/index/CachingMergeContext.java
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|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| /* | ||
| * 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.lucene.index; | ||
|
|
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| import java.io.IOException; | ||
| import java.util.HashMap; | ||
| import java.util.Set; | ||
| import org.apache.lucene.util.InfoStream; | ||
|
|
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| /** | ||
| * a wrapper of IndexWriter MergeContext. Try to cache the {@link | ||
| * #numDeletesToMerge(SegmentCommitInfo)} result in merge phase, to avoid duplicate calculation | ||
| */ | ||
| class CachingMergeContext implements MergePolicy.MergeContext { | ||
| final MergePolicy.MergeContext mergeContext; | ||
| final HashMap<SegmentCommitInfo, Integer> cachedNumDeletesToMerge = new HashMap<>(); | ||
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| CachingMergeContext(MergePolicy.MergeContext mergeContext) { | ||
| this.mergeContext = mergeContext; | ||
| } | ||
|
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| @Override | ||
| public final int numDeletesToMerge(SegmentCommitInfo info) throws IOException { | ||
| Integer numDeletesToMerge = cachedNumDeletesToMerge.get(info); | ||
| if (numDeletesToMerge != null) { | ||
| return numDeletesToMerge; | ||
| } | ||
| numDeletesToMerge = mergeContext.numDeletesToMerge(info); | ||
| cachedNumDeletesToMerge.put(info, numDeletesToMerge); | ||
| return numDeletesToMerge; | ||
| } | ||
|
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| @Override | ||
| public final int numDeletedDocs(SegmentCommitInfo info) { | ||
| return mergeContext.numDeletedDocs(info); | ||
| } | ||
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| @Override | ||
| public final InfoStream getInfoStream() { | ||
| return mergeContext.getInfoStream(); | ||
| } | ||
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| @Override | ||
| public final Set<SegmentCommitInfo> getMergingSegments() { | ||
| return mergeContext.getMergingSegments(); | ||
| } | ||
| } |
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69 changes: 69 additions & 0 deletions
69
lucene/core/src/test/org/apache/lucene/index/TestCachingMergeContext.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -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 org.apache.lucene.index; | ||
|
|
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| import java.io.IOException; | ||
| import java.util.Set; | ||
| import org.apache.lucene.tests.util.LuceneTestCase; | ||
| import org.apache.lucene.util.InfoStream; | ||
|
|
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| public class TestCachingMergeContext extends LuceneTestCase { | ||
| public void testNumDeletesToMerge() throws IOException { | ||
| MockMergeContext mergeContext = new MockMergeContext(); | ||
| CachingMergeContext cachingMergeContext = new CachingMergeContext(mergeContext); | ||
| assertEquals(cachingMergeContext.numDeletesToMerge(null), 1); | ||
| assertEquals(cachingMergeContext.cachedNumDeletesToMerge.size(), 1); | ||
| assertEquals( | ||
| cachingMergeContext.cachedNumDeletesToMerge.getOrDefault(null, -1), Integer.valueOf(1)); | ||
| assertEquals(mergeContext.count, 1); | ||
|
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| // increase the mock count | ||
| mergeContext.numDeletesToMerge(null); | ||
| assertEquals(mergeContext.count, 2); | ||
|
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| // assert the cache result still one | ||
| assertEquals(cachingMergeContext.numDeletesToMerge(null), 1); | ||
| assertEquals(cachingMergeContext.cachedNumDeletesToMerge.size(), 1); | ||
| assertEquals( | ||
| cachingMergeContext.cachedNumDeletesToMerge.getOrDefault(null, -1), Integer.valueOf(1)); | ||
| } | ||
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| private static final class MockMergeContext implements MergePolicy.MergeContext { | ||
| int count = 0; | ||
|
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| @Override | ||
| public final int numDeletesToMerge(SegmentCommitInfo info) throws IOException { | ||
| this.count += 1; | ||
| return this.count; | ||
| } | ||
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| @Override | ||
| public int numDeletedDocs(SegmentCommitInfo info) { | ||
| return 0; | ||
| } | ||
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| @Override | ||
| public InfoStream getInfoStream() { | ||
| return null; | ||
| } | ||
|
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| @Override | ||
| public Set<SegmentCommitInfo> getMergingSegments() { | ||
| return null; | ||
| } | ||
| } | ||
| } |