| /** |
| * |
| * 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.hadoop.hbase.regionserver; |
| |
| import java.util.Collections; |
| import java.util.List; |
| import org.apache.hadoop.hbase.CellComparator; |
| import org.apache.hadoop.hbase.util.ClassSize; |
| import org.apache.yetus.audience.InterfaceAudience; |
| |
| /** |
| * ImmutableSegment is an abstract class that extends the API supported by a {@link Segment}, |
| * and is not needed for a {@link MutableSegment}. |
| */ |
| @InterfaceAudience.Private |
| public abstract class ImmutableSegment extends Segment { |
| |
| public static final long DEEP_OVERHEAD = Segment.DEEP_OVERHEAD + ClassSize.NON_SYNC_TIMERANGE_TRACKER; |
| |
| // each sub-type of immutable segment knows whether it is flat or not |
| protected abstract boolean canBeFlattened(); |
| |
| public int getNumUniqueKeys() { |
| return getCellSet().getNumUniqueKeys(); |
| } |
| |
| ///////////////////// CONSTRUCTORS ///////////////////// |
| /**------------------------------------------------------------------------ |
| * Empty C-tor to be used only for CompositeImmutableSegment |
| */ |
| protected ImmutableSegment(CellComparator comparator) { |
| super(comparator, TimeRangeTracker.create(TimeRangeTracker.Type.NON_SYNC)); |
| } |
| |
| protected ImmutableSegment(CellComparator comparator, List<ImmutableSegment> segments) { |
| super(comparator, segments, TimeRangeTracker.create(TimeRangeTracker.Type.NON_SYNC)); |
| } |
| |
| /**------------------------------------------------------------------------ |
| * C-tor to be used to build the derived classes |
| */ |
| protected ImmutableSegment(CellSet cs, CellComparator comparator, MemStoreLAB memStoreLAB) { |
| super(cs, comparator, memStoreLAB, TimeRangeTracker.create(TimeRangeTracker.Type.NON_SYNC)); |
| } |
| |
| /**------------------------------------------------------------------------ |
| * Copy C-tor to be used when new CSLMImmutableSegment (derived) is being built from a Mutable one. |
| * This C-tor should be used when active MutableSegment is pushed into the compaction |
| * pipeline and becomes an ImmutableSegment. |
| */ |
| protected ImmutableSegment(Segment segment) { |
| super(segment); |
| } |
| |
| ///////////////////// PUBLIC METHODS ///////////////////// |
| |
| public int getNumOfSegments() { |
| return 1; |
| } |
| |
| public List<Segment> getAllSegments() { |
| return Collections.singletonList(this); |
| } |
| |
| @Override |
| public String toString() { |
| String res = super.toString(); |
| res += "Num uniques "+getNumUniqueKeys()+"; "; |
| return res; |
| } |
| |
| List<KeyValueScanner> getSnapshotScanners() { |
| return Collections.singletonList(new SnapshotSegmentScanner(this)); |
| } |
| } |