| /* |
| * 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.memory; |
| |
| import static org.apache.jackrabbit.oak.segment.DefaultSegmentWriterBuilder.defaultSegmentWriterBuilder; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.Set; |
| import java.util.concurrent.ConcurrentMap; |
| |
| import com.google.common.collect.Maps; |
| import org.apache.jackrabbit.oak.segment.CachingSegmentReader; |
| import org.apache.jackrabbit.oak.segment.Revisions; |
| import org.apache.jackrabbit.oak.segment.Segment; |
| import org.apache.jackrabbit.oak.segment.SegmentId; |
| import org.apache.jackrabbit.oak.segment.SegmentIdFactory; |
| import org.apache.jackrabbit.oak.segment.SegmentIdProvider; |
| import org.apache.jackrabbit.oak.segment.SegmentNotFoundException; |
| import org.apache.jackrabbit.oak.segment.SegmentReader; |
| import org.apache.jackrabbit.oak.segment.SegmentStore; |
| import org.apache.jackrabbit.oak.segment.SegmentTracker; |
| import org.apache.jackrabbit.oak.segment.SegmentWriter; |
| import org.apache.jackrabbit.oak.spi.blob.BlobStore; |
| import org.apache.jackrabbit.oak.stats.NoopStats; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * A store used for in-memory operations. |
| */ |
| public class MemoryStore implements SegmentStore { |
| |
| @NotNull |
| private final SegmentTracker tracker; |
| |
| @NotNull |
| private final MemoryStoreRevisions revisions; |
| |
| @NotNull |
| private final SegmentReader segmentReader; |
| |
| @NotNull |
| private final SegmentWriter segmentWriter; |
| |
| private final ConcurrentMap<SegmentId, Segment> segments = |
| Maps.newConcurrentMap(); |
| |
| public MemoryStore() throws IOException { |
| this.tracker = new SegmentTracker(new SegmentIdFactory() { |
| @Override @NotNull |
| public SegmentId newSegmentId(long msb, long lsb) { |
| return new SegmentId(MemoryStore.this, msb, lsb); |
| } |
| }); |
| this.revisions = new MemoryStoreRevisions(); |
| this.segmentReader = new CachingSegmentReader(this::getWriter, null, 16, 2, NoopStats.INSTANCE); |
| this.segmentWriter = defaultSegmentWriterBuilder("sys").withWriterPool().build(this); |
| revisions.bind(this); |
| segmentWriter.flush(); |
| } |
| |
| @NotNull |
| public SegmentWriter getWriter() { |
| return segmentWriter; |
| } |
| |
| @NotNull |
| public SegmentReader getReader() { |
| return segmentReader; |
| } |
| |
| @NotNull |
| public SegmentIdProvider getSegmentIdProvider() { |
| return tracker; |
| } |
| |
| @NotNull |
| public Revisions getRevisions() { |
| return revisions; |
| } |
| |
| @Override |
| public boolean containsSegment(SegmentId id) { |
| return id.sameStore(this) || segments.containsKey(id); |
| } |
| |
| @Override @NotNull |
| public Segment readSegment(SegmentId id) { |
| Segment segment = segments.get(id); |
| if (segment != null) { |
| return segment; |
| } |
| throw new SegmentNotFoundException(id); |
| } |
| |
| @Override |
| public void writeSegment( |
| SegmentId id, byte[] data, int offset, int length) throws IOException { |
| ByteBuffer buffer = ByteBuffer.allocate(length); |
| buffer.put(data, offset, length); |
| buffer.rewind(); |
| Segment segment = new Segment(tracker, segmentReader, id, buffer); |
| if (segments.putIfAbsent(id, segment) != null) { |
| throw new IOException("Segment override: " + id); |
| } |
| } |
| |
| /** |
| * @return {@code null} |
| */ |
| @Nullable |
| public BlobStore getBlobStore() { |
| return null; |
| } |
| |
| public void gc() { |
| System.gc(); |
| segments.keySet().retainAll(tracker.getReferencedSegmentIds()); |
| } |
| |
| public Set<SegmentId> getReferencedSegmentIds() { |
| return tracker.getReferencedSegmentIds(); |
| } |
| } |