| /* |
| * 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.plugins.document.util; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| import java.io.Serializable; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.apache.jackrabbit.oak.plugins.document.Revision; |
| import org.mapdb.BTreeMap; |
| import org.mapdb.DB; |
| import org.mapdb.DBMaker; |
| import org.mapdb.Serializer; |
| |
| /** |
| * A MapFactory backed by MapDB, which stores the map in a temporary file. |
| */ |
| public class MapDBMapFactory extends MapFactory { |
| |
| private final AtomicInteger counter = new AtomicInteger(); |
| private final DB db; |
| |
| public MapDBMapFactory() { |
| this.db = DBMaker.newTempFileDB() |
| .deleteFilesAfterClose() |
| .closeOnJvmShutdown() |
| .transactionDisable() |
| .asyncWriteEnable() |
| .make(); |
| } |
| |
| @Override |
| public BTreeMap<String, Revision> create() { |
| return db.createTreeMap(String.valueOf(counter.incrementAndGet())) |
| .valueSerializer(new RevisionSerializer()) |
| .counterEnable() |
| .makeStringMap(); |
| } |
| |
| private static class RevisionSerializer implements Serializer<Revision>, |
| Serializable { |
| private static final long serialVersionUID = 8648365575103098316L; |
| private int size = 8 + 4 + 4 + 1; |
| public void serialize(DataOutput o, Revision r) throws IOException { |
| o.writeLong(r.getTimestamp()); |
| o.writeInt(r.getCounter()); |
| o.writeInt(r.getClusterId()); |
| o.writeBoolean(r.isBranch()); |
| |
| } |
| |
| public Revision deserialize(DataInput i, int available) throws IOException { |
| return new Revision( |
| i.readLong(), //timestamp |
| i.readInt(), //counter |
| i.readInt(), //clusterId |
| i.readBoolean()); //branch |
| } |
| |
| public int fixedSize() { |
| return size; |
| } |
| } |
| } |