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Optimise BTree build, update and transform operations
Patch Benedict Elliott Smith; reviewed by Branimir Lambov and Benjamin Lerer for CASSANDRA-15510
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| /* | ||
| * 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.cassandra.utils; | ||
|
|
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| import java.util.Iterator; | ||
|
|
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| import org.apache.cassandra.utils.caching.TinyThreadLocalPool; | ||
|
|
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| public interface BulkIterator<V> extends AutoCloseable | ||
| { | ||
| void fetch(Object[] into, int offset, int count); | ||
| V next(); | ||
| default void close() {}; | ||
|
|
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| public static class FromArray<V> implements BulkIterator<V>, AutoCloseable | ||
| { | ||
| private static final TinyThreadLocalPool<FromArray> POOL = new TinyThreadLocalPool<>(); | ||
|
|
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| private Object[] from; | ||
| private int i; | ||
| private TinyThreadLocalPool.TinyPool<FromArray> pool; | ||
|
|
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| private void init(Object[] from, int offset) | ||
| { | ||
| this.from = from; | ||
| this.i = offset; | ||
| } | ||
|
|
||
| public void close() | ||
| { | ||
| pool.offer(this); | ||
| from = null; | ||
| pool = null; | ||
| } | ||
|
|
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| public void fetch(Object[] into, int offset, int count) | ||
| { | ||
| System.arraycopy(from, i, into, offset, count); | ||
| i += count; | ||
| } | ||
|
|
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| public V next() | ||
| { | ||
| return (V) from[i++]; | ||
| } | ||
| } | ||
|
|
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| public static class Adapter<V> implements BulkIterator<V> | ||
| { | ||
| final Iterator<V> adapt; | ||
|
|
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| private Adapter(Iterator<V> adapt) | ||
| { | ||
| this.adapt = adapt; | ||
| } | ||
|
|
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| public void fetch(Object[] into, int offset, int count) | ||
| { | ||
| count += offset; | ||
| while (offset < count && adapt.hasNext()) | ||
| into[offset++] = adapt.next(); | ||
| } | ||
|
|
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| public boolean hasNext() | ||
| { | ||
| return adapt.hasNext(); | ||
| } | ||
|
|
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| public V next() | ||
| { | ||
| return adapt.next(); | ||
| } | ||
| } | ||
|
|
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| public static <V> FromArray<V> of(Object[] from) | ||
| { | ||
| return of(from, 0); | ||
| } | ||
|
|
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| public static <V> FromArray<V> of(Object[] from, int offset) | ||
| { | ||
| TinyThreadLocalPool.TinyPool<FromArray> pool = FromArray.POOL.get(); | ||
| FromArray<V> result = pool.poll(); | ||
| if (result == null) | ||
| result = new FromArray<>(); | ||
| result.init(from, offset); | ||
| result.pool = pool; | ||
| return result; | ||
| } | ||
|
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| public static <V> Adapter<V> of(Iterator<V> from) | ||
| { | ||
| return new Adapter<>(from); | ||
| } | ||
| } | ||
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