| /* |
| * 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.partitions; |
| |
| import java.util.Arrays; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| |
| import org.apache.cassandra.db.DeletionInfo; |
| import org.apache.cassandra.db.RegularAndStaticColumns; |
| import org.apache.cassandra.db.rows.EncodingStats; |
| import org.apache.cassandra.db.rows.Row; |
| import org.apache.cassandra.db.rows.Rows; |
| import org.apache.cassandra.utils.ObjectSizes; |
| import org.apache.cassandra.utils.btree.BTree; |
| |
| /** |
| * Holder of the content of a partition, see {@link AbstractBTreePartition}. |
| * When updating a partition one holder is swapped for another atomically. |
| */ |
| public final class BTreePartitionData |
| { |
| public static final BTreePartitionData EMPTY = new BTreePartitionData(RegularAndStaticColumns.NONE, |
| BTree.empty(), |
| DeletionInfo.LIVE, |
| Rows.EMPTY_STATIC_ROW, |
| EncodingStats.NO_STATS); |
| public static final long UNSHARED_HEAP_SIZE = ObjectSizes.measure(EMPTY); |
| |
| |
| final RegularAndStaticColumns columns; |
| final DeletionInfo deletionInfo; |
| // the btree of rows |
| final Object[] tree; |
| final Row staticRow; |
| public final EncodingStats stats; |
| |
| BTreePartitionData(RegularAndStaticColumns columns, |
| Object[] tree, |
| DeletionInfo deletionInfo, |
| Row staticRow, |
| EncodingStats stats) |
| { |
| this.columns = columns; |
| this.tree = tree; |
| this.deletionInfo = deletionInfo; |
| this.staticRow = staticRow == null ? Rows.EMPTY_STATIC_ROW : staticRow; |
| this.stats = stats; |
| } |
| |
| BTreePartitionData withColumns(RegularAndStaticColumns columns) |
| { |
| return new BTreePartitionData(columns, this.tree, this.deletionInfo, this.staticRow, this.stats); |
| } |
| |
| @VisibleForTesting |
| public static BTreePartitionData unsafeGetEmpty() |
| { |
| return EMPTY; |
| } |
| |
| @VisibleForTesting |
| public static BTreePartitionData unsafeConstruct(RegularAndStaticColumns columns, |
| Object[] tree, |
| DeletionInfo deletionInfo, |
| Row staticRow, |
| EncodingStats stats) |
| { |
| return new BTreePartitionData(columns, tree, deletionInfo, staticRow, stats); |
| } |
| |
| @VisibleForTesting |
| public static void unsafeInvalidate(AtomicBTreePartition partition) |
| { |
| BTreePartitionData holder = partition.unsafeGetHolder(); |
| if (!BTree.isEmpty(holder.tree)) |
| { |
| partition.unsafeSetHolder(unsafeConstruct(holder.columns, |
| Arrays.copyOf(holder.tree, holder.tree.length), |
| holder.deletionInfo, |
| holder.staticRow, |
| holder.stats)); |
| } |
| } |
| } |