/* * 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.db.index.sasi.memory; import java.nio.ByteBuffer; import java.util.*; import java.util.concurrent.ConcurrentSkipListMap; import java.util.concurrent.ConcurrentSkipListSet; import org.apache.cassandra.db.DecoratedKey; import org.apache.cassandra.db.index.sasi.conf.ColumnIndex; import org.apache.cassandra.db.index.sasi.disk.Token; import org.apache.cassandra.db.index.sasi.plan.Expression; import org.apache.cassandra.db.index.sasi.utils.RangeUnionIterator; import org.apache.cassandra.db.index.sasi.utils.RangeIterator; import org.apache.cassandra.db.marshal.AbstractType; import org.apache.cassandra.service.StorageService; import org.github.jamm.MemoryMeter; public class SkipListMemIndex extends MemIndex { private final ConcurrentSkipListMap<ByteBuffer, ConcurrentSkipListSet<DecoratedKey>> index; public SkipListMemIndex(AbstractType<?> keyValidator, ColumnIndex columnIndex) { super(keyValidator, columnIndex); index = new ConcurrentSkipListMap<>(columnIndex.getValidator()); } @Override public void add(ByteBuffer value, ByteBuffer key) { final DecoratedKey dk = StorageService.getPartitioner().decorateKey(key); ConcurrentSkipListSet<DecoratedKey> keys = index.get(value); if (keys == null) { ConcurrentSkipListSet<DecoratedKey> newKeys = new ConcurrentSkipListSet<>(DecoratedKey.comparator); keys = index.putIfAbsent(value, newKeys); if (keys == null) keys = newKeys; } keys.add(dk); } @Override public RangeIterator<Long, Token> search(Expression expression) { ByteBuffer min = expression.lower == null ? null : expression.lower.value; ByteBuffer max = expression.upper == null ? null : expression.upper.value; SortedMap<ByteBuffer, ConcurrentSkipListSet<DecoratedKey>> search; if (min == null && max == null) { throw new IllegalArgumentException(); } if (min != null && max != null) { search = index.subMap(min, expression.lower.inclusive, max, expression.upper.inclusive); } else if (min == null) { search = index.headMap(max, expression.upper.inclusive); } else { search = index.tailMap(min, expression.lower.inclusive); } RangeUnionIterator.Builder<Long, Token> builder = RangeUnionIterator.builder(); for (ConcurrentSkipListSet<DecoratedKey> keys : search.values()) { if (!keys.isEmpty()) builder.add(new KeyRangeIterator(keys)); } return builder.build(); } @Override public long estimateSize(MemoryMeter meter) { return meter.measureDeep(index); } }