| /* |
| * 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.jackrabbit.oak.segment; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static java.lang.Integer.parseInt; |
| import static org.apache.jackrabbit.oak.segment.CacheWeights.OBJECT_HEADER_SIZE; |
| |
| import java.nio.ByteBuffer; |
| import java.util.UUID; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| import org.jetbrains.annotations.NotNull; |
| |
| /** |
| * The record id. This includes the segment id and the offset within the |
| * segment. |
| */ |
| public final class RecordId implements Comparable<RecordId> { |
| |
| /** |
| * A {@code null} record id not identifying any record. |
| */ |
| public static final RecordId NULL = new RecordId(SegmentId.NULL, 0); |
| |
| private static final Pattern PATTERN = Pattern.compile( |
| "([0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12})" |
| + "(:(0|[1-9][0-9]*)|\\.([0-9a-f]{8}))"); |
| |
| static final int SERIALIZED_RECORD_ID_BYTES = 20; |
| |
| public static RecordId[] EMPTY_ARRAY = new RecordId[0]; |
| |
| public static RecordId fromString(SegmentIdProvider idProvider, String id) { |
| Matcher matcher = PATTERN.matcher(id); |
| if (matcher.matches()) { |
| UUID uuid = UUID.fromString(matcher.group(1)); |
| SegmentId segmentId = idProvider.newSegmentId( |
| uuid.getMostSignificantBits(), |
| uuid.getLeastSignificantBits()); |
| |
| int offset; |
| if (matcher.group(3) != null) { |
| offset = parseInt(matcher.group(3)); |
| } else { |
| offset = parseInt(matcher.group(4), 16); |
| } |
| |
| return new RecordId(segmentId, offset); |
| } else { |
| throw new IllegalArgumentException("Bad record identifier: " + id); |
| } |
| } |
| |
| private final SegmentId segmentId; |
| |
| private final int offset; |
| |
| public RecordId(SegmentId segmentId, int offset) { |
| this.segmentId = checkNotNull(segmentId); |
| this.offset = offset; |
| } |
| |
| public SegmentId getSegmentId() { |
| return segmentId; |
| } |
| |
| public int getRecordNumber() { |
| return offset; |
| } |
| |
| /** |
| * @return the segment id part of this record id as UUID |
| */ |
| public UUID asUUID() { |
| return segmentId.asUUID(); |
| } |
| |
| @NotNull |
| public Segment getSegment() { |
| return segmentId.getSegment(); |
| } |
| |
| /** |
| * Serialise this record id into an array of bytes: {@code (msb, lsb, offset >> 2)} |
| * @return this record id as byte array |
| */ |
| @NotNull |
| ByteBuffer getBytes() { |
| byte[] buffer = new byte[SERIALIZED_RECORD_ID_BYTES]; |
| BinaryUtils.writeLong(buffer, 0, segmentId.getMostSignificantBits()); |
| BinaryUtils.writeLong(buffer, 8, segmentId.getLeastSignificantBits()); |
| BinaryUtils.writeInt(buffer, 16, offset); |
| return ByteBuffer.wrap(buffer); |
| } |
| |
| //--------------------------------------------------------< Comparable >-- |
| |
| @Override |
| public int compareTo(@NotNull RecordId that) { |
| checkNotNull(that); |
| int diff = segmentId.compareTo(that.segmentId); |
| if (diff == 0) { |
| diff = offset - that.offset; |
| } |
| return diff; |
| } |
| |
| //------------------------------------------------------------< Object >-- |
| |
| @Override |
| public String toString() { |
| return String.format("%s.%08x", segmentId, offset); |
| } |
| |
| /** |
| * Returns the record id string representation used in Oak 1.0. |
| */ |
| public String toString10() { |
| return String.format("%s:%d", segmentId, offset); |
| } |
| |
| @Override |
| public int hashCode() { |
| return segmentId.hashCode() ^ offset; |
| } |
| |
| @Override |
| public boolean equals(Object object) { |
| if (this == object) { |
| return true; |
| } else if (object instanceof RecordId) { |
| RecordId that = (RecordId) object; |
| return offset == that.offset && segmentId.equals(that.segmentId); |
| } else { |
| return false; |
| } |
| } |
| |
| public int estimateMemoryUsage() { |
| return OBJECT_HEADER_SIZE + 16 + segmentId.estimateMemoryUsage(); |
| } |
| |
| } |