/*
* 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.segment.memory;
import static org.apache.jackrabbit.oak.plugins.memory.EmptyNodeState.EMPTY_NODE;
import java.nio.ByteBuffer;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.ConcurrentMap;
import javax.annotation.Nonnull;
import org.apache.jackrabbit.oak.plugins.segment.AbstractStore;
import org.apache.jackrabbit.oak.plugins.segment.Journal;
import org.apache.jackrabbit.oak.plugins.segment.Segment;
import org.apache.jackrabbit.oak.spi.state.NodeBuilder;
import org.apache.jackrabbit.oak.spi.state.NodeState;
import com.google.common.collect.Maps;
public class MemoryStore extends AbstractStore {
private final Map<String, Journal> journals = Maps.newHashMap();
private final ConcurrentMap<UUID, Segment> segments =
Maps.newConcurrentMap();
public MemoryStore(NodeState root) {
super(0);
NodeBuilder builder = EMPTY_NODE.builder();
builder.setChildNode("root", root);
journals.put("root", new MemoryJournal(this, builder.getNodeState()));
}
public MemoryStore() {
this(EMPTY_NODE);
}
@Override
public void close() {
}
@Override
public synchronized Journal getJournal(final String name) {
Journal journal = journals.get(name);
if (journal == null) {
journal = new MemoryJournal(this, "root");
journals.put(name, journal);
}
return journal;
}
@Override @Nonnull
protected Segment loadSegment(UUID id) {
Segment segment = segments.get(id);
if (segment != null) {
return segment;
} else {
throw new IllegalArgumentException("Segment not found: " + id);
}
}
@Override
public void writeSegment(
UUID segmentId, byte[] data, int offset, int length) {
ByteBuffer buffer = ByteBuffer.allocate(length);
buffer.put(data, offset, length);
buffer.rewind();
Segment segment = createSegment(segmentId, buffer);
if (segments.putIfAbsent(segment.getSegmentId(), segment) != null) {
throw new IllegalStateException(
"Segment override: " + segment.getSegmentId());
}
}
@Override
public void deleteSegment(UUID segmentId) {
if (segments.remove(segmentId) == null) {
throw new IllegalStateException("Missing segment: " + segmentId);
}
}
}