| /* |
| * 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.commitlog; |
| |
| import java.io.IOException; |
| import java.util.Comparator; |
| |
| import org.apache.cassandra.db.TypeSizes; |
| import org.apache.cassandra.io.ISerializer; |
| import org.apache.cassandra.io.util.DataInputPlus; |
| import org.apache.cassandra.io.util.DataOutputPlus; |
| |
| /** |
| * Contains a segment id and a position for CommitLogSegment identification. |
| * Used for both replay and general CommitLog file reading. |
| */ |
| public class CommitLogPosition implements Comparable<CommitLogPosition> |
| { |
| public static final CommitLogPositionSerializer serializer = new CommitLogPositionSerializer(); |
| |
| // NONE is used for SSTables that are streamed from other nodes and thus have no relationship |
| // with our local commitlog. The values satisfy the criteria that |
| // - no real commitlog segment will have the given id |
| // - it will sort before any real CommitLogPosition, so it will be effectively ignored by getCommitLogPosition |
| public static final CommitLogPosition NONE = new CommitLogPosition(-1, 0); |
| |
| public final long segmentId; |
| public final int position; |
| |
| public static final Comparator<CommitLogPosition> comparator = new Comparator<CommitLogPosition>() |
| { |
| public int compare(CommitLogPosition o1, CommitLogPosition o2) |
| { |
| if (o1.segmentId != o2.segmentId) |
| return Long.compare(o1.segmentId, o2.segmentId); |
| |
| return Integer.compare(o1.position, o2.position); |
| } |
| }; |
| |
| public CommitLogPosition(long segmentId, int position) |
| { |
| this.segmentId = segmentId; |
| assert position >= 0; |
| this.position = position; |
| } |
| |
| public int compareTo(CommitLogPosition other) |
| { |
| return comparator.compare(this, other); |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| |
| CommitLogPosition that = (CommitLogPosition) o; |
| |
| if (position != that.position) return false; |
| return segmentId == that.segmentId; |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| int result = (int) (segmentId ^ (segmentId >>> 32)); |
| result = 31 * result + position; |
| return result; |
| } |
| |
| @Override |
| public String toString() |
| { |
| return "CommitLogPosition(" + |
| "segmentId=" + segmentId + |
| ", position=" + position + |
| ')'; |
| } |
| |
| public CommitLogPosition clone() |
| { |
| return new CommitLogPosition(segmentId, position); |
| } |
| |
| |
| public static class CommitLogPositionSerializer implements ISerializer<CommitLogPosition> |
| { |
| public void serialize(CommitLogPosition clsp, DataOutputPlus out) throws IOException |
| { |
| out.writeLong(clsp.segmentId); |
| out.writeInt(clsp.position); |
| } |
| |
| public CommitLogPosition deserialize(DataInputPlus in) throws IOException |
| { |
| return new CommitLogPosition(in.readLong(), in.readInt()); |
| } |
| |
| public long serializedSize(CommitLogPosition clsp) |
| { |
| return TypeSizes.sizeof(clsp.segmentId) + TypeSizes.sizeof(clsp.position); |
| } |
| } |
| } |