| /* |
| * 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.io.DataInput; |
| import java.io.IOException; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Objects; |
| |
| import org.apache.cassandra.cache.IMeasurableMemory; |
| import org.apache.cassandra.io.ISerializer; |
| import org.apache.cassandra.io.util.DataOutputPlus; |
| import org.apache.cassandra.io.util.FileUtils; |
| import org.apache.cassandra.utils.ObjectSizes; |
| import org.codehaus.jackson.annotate.JsonIgnore; |
| |
| /** |
| * A top-level (row) tombstone. |
| */ |
| public class DeletionTime implements Comparable<DeletionTime>, IMeasurableMemory |
| { |
| private static final long EMPTY_SIZE = ObjectSizes.measure(new DeletionTime(0, 0)); |
| |
| /** |
| * A special DeletionTime that signifies that there is no top-level (row) tombstone. |
| */ |
| public static final DeletionTime LIVE = new DeletionTime(Long.MIN_VALUE, Integer.MAX_VALUE); |
| |
| /** |
| * A timestamp (typically in microseconds since the unix epoch, although this is not enforced) after which |
| * data should be considered deleted. If set to Long.MIN_VALUE, this implies that the data has not been marked |
| * for deletion at all. |
| */ |
| public final long markedForDeleteAt; |
| |
| /** |
| * The local server timestamp, in seconds since the unix epoch, at which this tombstone was created. This is |
| * only used for purposes of purging the tombstone after gc_grace_seconds have elapsed. |
| */ |
| public final int localDeletionTime; |
| |
| public static final Serializer serializer = new Serializer(); |
| |
| @VisibleForTesting |
| public DeletionTime(long markedForDeleteAt, int localDeletionTime) |
| { |
| this.markedForDeleteAt = markedForDeleteAt; |
| this.localDeletionTime = localDeletionTime; |
| } |
| |
| /** |
| * Returns whether this DeletionTime is live, that is deletes no columns. |
| */ |
| @JsonIgnore |
| public boolean isLive() |
| { |
| return markedForDeleteAt == Long.MIN_VALUE && localDeletionTime == Integer.MAX_VALUE; |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if(!(o instanceof DeletionTime)) |
| return false; |
| DeletionTime that = (DeletionTime)o; |
| return markedForDeleteAt == that.markedForDeleteAt && localDeletionTime == that.localDeletionTime; |
| } |
| |
| @Override |
| public final int hashCode() |
| { |
| return Objects.hashCode(markedForDeleteAt, localDeletionTime); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return String.format("deletedAt=%d, localDeletion=%d", markedForDeleteAt, localDeletionTime); |
| } |
| |
| public int compareTo(DeletionTime dt) |
| { |
| if (markedForDeleteAt < dt.markedForDeleteAt) |
| return -1; |
| else if (markedForDeleteAt > dt.markedForDeleteAt) |
| return 1; |
| else if (localDeletionTime < dt.localDeletionTime) |
| return -1; |
| else if (localDeletionTime > dt.localDeletionTime) |
| return 1; |
| else |
| return 0; |
| } |
| |
| public boolean isGcAble(int gcBefore) |
| { |
| return localDeletionTime < gcBefore; |
| } |
| |
| public boolean isDeleted(OnDiskAtom atom) |
| { |
| return atom.timestamp() <= markedForDeleteAt; |
| } |
| |
| public boolean supersedes(DeletionTime dt) |
| { |
| return this.markedForDeleteAt > dt.markedForDeleteAt; |
| } |
| |
| public long unsharedHeapSize() |
| { |
| return EMPTY_SIZE; |
| } |
| |
| public static class Serializer implements ISerializer<DeletionTime> |
| { |
| public void serialize(DeletionTime delTime, DataOutputPlus out) throws IOException |
| { |
| out.writeInt(delTime.localDeletionTime); |
| out.writeLong(delTime.markedForDeleteAt); |
| } |
| |
| public DeletionTime deserialize(DataInput in) throws IOException |
| { |
| int ldt = in.readInt(); |
| long mfda = in.readLong(); |
| return mfda == Long.MIN_VALUE && ldt == Integer.MAX_VALUE |
| ? LIVE |
| : new DeletionTime(mfda, ldt); |
| } |
| |
| public void skip(DataInput in) throws IOException |
| { |
| FileUtils.skipBytesFully(in, 4 + 8); |
| } |
| |
| public long serializedSize(DeletionTime delTime, TypeSizes typeSizes) |
| { |
| return typeSizes.sizeof(delTime.localDeletionTime) |
| + typeSizes.sizeof(delTime.markedForDeleteAt); |
| } |
| } |
| } |