| /* |
| * 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; |
| |
| import java.util.Iterator; |
| |
| import org.apache.cassandra.cache.IMeasurableMemory; |
| import org.apache.cassandra.db.rows.EncodingStats; |
| import org.apache.cassandra.utils.memory.AbstractAllocator; |
| |
| /** |
| * A combination of a top-level (partition) tombstone and range tombstones describing the deletions |
| * within a partition. |
| * <p> |
| * Note that in practice {@link MutableDeletionInfo} is the only concrete implementation of this, however |
| * different parts of the code will return either {@code DeletionInfo} or {@code MutableDeletionInfo} based |
| * on whether it can/should be mutated or not. |
| * <p> |
| * <b>Warning:</b> do not ever cast a {@code DeletionInfo} into a {@code MutableDeletionInfo} to mutate it!!! |
| * TODO: it would be safer to have 2 actual implementation of DeletionInfo, one mutable and one that isn't (I'm |
| * just lazy right this minute). |
| */ |
| public interface DeletionInfo extends IMeasurableMemory |
| { |
| // Note that while MutableDeletionInfo.live() is mutable, we expose it here as a non-mutable DeletionInfo so sharing is fine. |
| public static final DeletionInfo LIVE = MutableDeletionInfo.live(); |
| |
| /** |
| * Returns whether this DeletionInfo is live, that is deletes no columns. |
| */ |
| public boolean isLive(); |
| |
| public DeletionTime getPartitionDeletion(); |
| |
| // Use sparingly, not the most efficient thing |
| public Iterator<RangeTombstone> rangeIterator(boolean reversed); |
| |
| public Iterator<RangeTombstone> rangeIterator(Slice slice, boolean reversed); |
| |
| public RangeTombstone rangeCovering(Clustering name); |
| |
| public void collectStats(EncodingStats.Collector collector); |
| |
| public int dataSize(); |
| |
| public boolean hasRanges(); |
| |
| public int rangeCount(); |
| |
| public long maxTimestamp(); |
| |
| /** |
| * Whether this deletion info may modify the provided one if added to it. |
| */ |
| public boolean mayModify(DeletionInfo delInfo); |
| |
| public MutableDeletionInfo mutableCopy(); |
| public DeletionInfo copy(AbstractAllocator allocator); |
| } |