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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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,
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* See the License for the specific language governing permissions and
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package org.apache.cassandra.index.sai.memory;
import org.apache.cassandra.db.Clustering;
import org.apache.cassandra.db.DecoratedKey;
import org.apache.cassandra.db.PartitionPosition;
import org.apache.cassandra.dht.AbstractBounds;
import org.apache.cassandra.index.sai.QueryContext;
import org.apache.cassandra.index.sai.StorageAttachedIndex;
import org.apache.cassandra.index.sai.disk.format.IndexDescriptor;
import org.apache.cassandra.index.sai.utils.IndexIdentifier;
import org.apache.cassandra.index.sai.disk.v1.segment.SegmentMetadata;
import org.apache.cassandra.index.sai.iterators.KeyRangeIterator;
import org.apache.cassandra.index.sai.plan.Expression;
import org.apache.cassandra.index.sai.utils.PrimaryKey;
import org.apache.cassandra.index.sai.utils.PrimaryKeys;
import org.apache.cassandra.utils.Pair;
import org.apache.cassandra.utils.bytecomparable.ByteComparable;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Iterator;
import java.util.function.Function;
public abstract class MemoryIndex implements MemtableOrdering
{
protected final StorageAttachedIndex index;
protected MemoryIndex(StorageAttachedIndex index)
{
this.index = index;
}
public abstract long add(DecoratedKey key, Clustering clustering, ByteBuffer value);
public abstract long update(DecoratedKey key, Clustering clustering, ByteBuffer oldValue, ByteBuffer newValue);
public abstract KeyRangeIterator search(QueryContext queryContext, Expression expression, AbstractBounds keyRange);
public abstract boolean isEmpty();
public abstract ByteBuffer getMinTerm();
public abstract ByteBuffer getMaxTerm();
/**
* Iterate all Term->PrimaryKeys mappings in sorted order
*/
public abstract Iterator> iterator();
public abstract SegmentMetadata.ComponentMetadataMap writeDirect(IndexDescriptor indexDescriptor,
IndexIdentifier indexIdentifier,
Function postingTransformer) throws IOException;
}