| /* |
| * 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.cow; |
| |
| import org.apache.jackrabbit.oak.api.Blob; |
| import org.apache.jackrabbit.oak.api.CommitFailedException; |
| import org.apache.jackrabbit.oak.plugins.memory.MemoryNodeStore; |
| import org.apache.jackrabbit.oak.spi.commit.CommitHook; |
| import org.apache.jackrabbit.oak.spi.commit.CommitInfo; |
| import org.apache.jackrabbit.oak.spi.commit.Observable; |
| import org.apache.jackrabbit.oak.spi.commit.Observer; |
| import org.apache.jackrabbit.oak.spi.state.NodeBuilder; |
| import org.apache.jackrabbit.oak.spi.state.NodeState; |
| import org.apache.jackrabbit.oak.spi.state.NodeStore; |
| import org.jetbrains.annotations.NotNull; |
| |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.UUID; |
| import java.util.concurrent.TimeUnit; |
| import java.util.stream.Collectors; |
| import java.util.stream.StreamSupport; |
| import static com.google.common.collect.Iterables.addAll; |
| import static com.google.common.collect.Lists.newArrayList; |
| import static com.google.common.collect.Lists.newCopyOnWriteArrayList; |
| import static com.google.common.collect.Maps.newConcurrentMap; |
| import static com.google.common.collect.Maps.newHashMap; |
| import static java.util.Collections.emptyMap; |
| import static java.util.Collections.singletonMap; |
| import static java.util.stream.Collectors.toList; |
| import static java.util.stream.StreamSupport.stream; |
| |
| public class BranchNodeStore implements NodeStore, Observable { |
| |
| private static final long CHECKPOINT_LIFETIME = TimeUnit.HOURS.toMillis(24); |
| |
| private final NodeStore nodeStore; |
| |
| private final MemoryNodeStore memoryNodeStore; |
| |
| private final Collection<String> inheritedCheckpoints; |
| |
| private final Map<String, String> checkpointMapping; |
| |
| public BranchNodeStore(NodeStore nodeStore) throws CommitFailedException { |
| this.nodeStore = nodeStore; |
| this.inheritedCheckpoints = newArrayList(nodeStore.checkpoints()); |
| this.checkpointMapping = newConcurrentMap(); |
| |
| String cp = nodeStore.checkpoint(CHECKPOINT_LIFETIME, singletonMap("type", "copy-on-write")); |
| memoryNodeStore = new MemoryNodeStore(nodeStore.retrieve(cp)); |
| } |
| |
| public void dispose() { |
| for (String cp : nodeStore.checkpoints()) { |
| if ("copy-on-write".equals(nodeStore.checkpointInfo(cp).get("type"))) { |
| nodeStore.release(cp); |
| } |
| } |
| } |
| |
| @NotNull |
| @Override |
| public NodeState getRoot() { |
| return memoryNodeStore.getRoot(); |
| } |
| |
| @NotNull |
| @Override |
| public synchronized NodeState merge(@NotNull NodeBuilder builder, @NotNull CommitHook commitHook, @NotNull CommitInfo info) throws CommitFailedException { |
| return memoryNodeStore.merge(builder, commitHook, info); |
| } |
| |
| @NotNull |
| @Override |
| public NodeState rebase(@NotNull NodeBuilder builder) { |
| return memoryNodeStore.rebase(builder); |
| } |
| |
| @Override |
| public NodeState reset(@NotNull NodeBuilder builder) { |
| return memoryNodeStore.reset(builder); |
| } |
| |
| @NotNull |
| @Override |
| public Blob createBlob(InputStream inputStream) throws IOException { |
| return memoryNodeStore.createBlob(inputStream); |
| } |
| |
| @Override |
| public Blob getBlob(@NotNull String reference) { |
| return memoryNodeStore.getBlob(reference); |
| } |
| |
| @NotNull |
| @Override |
| public String checkpoint(long lifetime, @NotNull Map<String, String> properties) { |
| String checkpoint = memoryNodeStore.checkpoint(lifetime, properties); |
| String uuid = UUID.randomUUID().toString(); |
| checkpointMapping.put(uuid, checkpoint); |
| return uuid; |
| } |
| |
| @NotNull |
| @Override |
| public String checkpoint(long lifetime) { |
| return checkpoint(lifetime, emptyMap()); |
| } |
| |
| |
| @NotNull |
| @Override |
| public Iterable<String> checkpoints() { |
| List<String> result = newArrayList(inheritedCheckpoints); |
| result.retainAll(newArrayList(nodeStore.checkpoints())); |
| |
| checkpointMapping.entrySet().stream() |
| .filter(e -> memoryNodeStore.listCheckpoints().contains(e.getValue())) |
| .map(Map.Entry::getKey) |
| .forEach(result::add); |
| |
| return result; |
| } |
| |
| @NotNull |
| @Override |
| public Map<String, String> checkpointInfo(@NotNull String checkpoint) { |
| if (inheritedCheckpoints.contains(checkpoint)) { |
| return nodeStore.checkpointInfo(checkpoint); |
| } else if (checkpointMapping.containsKey(checkpoint)) { |
| return memoryNodeStore.checkpointInfo(checkpointMapping.get(checkpoint)); |
| } else { |
| return emptyMap(); |
| } |
| } |
| |
| @Override |
| public NodeState retrieve(@NotNull String checkpoint) { |
| if (inheritedCheckpoints.contains(checkpoint)) { |
| return nodeStore.retrieve(checkpoint); |
| } else if (checkpointMapping.containsKey(checkpoint)) { |
| return memoryNodeStore.retrieve(checkpointMapping.get(checkpoint)); |
| } else { |
| return null; |
| } |
| } |
| |
| @Override |
| public boolean release(@NotNull String checkpoint) { |
| if (inheritedCheckpoints.contains(checkpoint)) { |
| return nodeStore.release(checkpoint); |
| } else if (checkpointMapping.containsKey(checkpoint)) { |
| return memoryNodeStore.release(checkpointMapping.remove(checkpoint)); |
| } else { |
| return false; |
| } |
| } |
| |
| @Override |
| public Closeable addObserver(Observer observer) { |
| return memoryNodeStore.addObserver(observer); |
| } |
| } |