89 lines
2.9 KiB
Java
89 lines
2.9 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.cassandra.db.composites;
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import java.nio.ByteBuffer;
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import org.apache.cassandra.config.CFMetaData;
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import org.apache.cassandra.utils.ObjectSizes;
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import org.apache.cassandra.utils.memory.AbstractAllocator;
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/**
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* A "truly-composite" Composite.
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*/
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public class CompoundComposite extends AbstractComposite
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{
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private static final long HEAP_SIZE = ObjectSizes.measure(new CompoundComposite(null, 0, false));
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// We could use a List, but we'll create such object *a lot* and using a array+size is not
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// all that harder, so we save the List object allocation.
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final ByteBuffer[] elements;
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final int size;
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final boolean isStatic;
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CompoundComposite(ByteBuffer[] elements, int size, boolean isStatic)
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{
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this.elements = elements;
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this.size = size;
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this.isStatic = isStatic;
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}
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public int size()
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{
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return size;
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}
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public ByteBuffer get(int i)
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{
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// Note: most consumer should validate that i is within bounds. However, for backward compatibility
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// reasons, composite dense tables can have names that don't have all their component of the clustering
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// columns, which may end up here with i > size(). For those calls, it's actually simpler to return null
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// than to force the caller to special case.
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return i >= size() ? null : elements[i];
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}
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@Override
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public boolean isStatic()
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{
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return isStatic;
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}
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protected ByteBuffer[] elementsCopy(AbstractAllocator allocator)
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{
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ByteBuffer[] elementsCopy = new ByteBuffer[size];
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for (int i = 0; i < size; i++)
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elementsCopy[i] = allocator.clone(elements[i]);
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return elementsCopy;
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}
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public long unsharedHeapSize()
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{
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return HEAP_SIZE + ObjectSizes.sizeOnHeapOf(elements);
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}
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public long unsharedHeapSizeExcludingData()
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{
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return HEAP_SIZE + ObjectSizes.sizeOnHeapExcludingData(elements);
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}
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public Composite copy(CFMetaData cfm, AbstractAllocator allocator)
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{
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return new CompoundComposite(elementsCopy(allocator), size, isStatic);
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}
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}
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