| /* |
| * 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; |
| |
| import java.util.concurrent.Executor; |
| |
| import org.apache.jackrabbit.oak.api.CommitFailedException; |
| import org.apache.jackrabbit.oak.spi.commit.ChangeDispatcher; |
| import org.apache.jackrabbit.oak.spi.commit.CommitInfo; |
| import org.apache.jackrabbit.oak.spi.commit.DefaultEditor; |
| import org.apache.jackrabbit.oak.spi.commit.Editor; |
| import org.apache.jackrabbit.oak.spi.commit.EditorDiff; |
| import org.apache.jackrabbit.oak.spi.commit.VisibleEditor; |
| import org.apache.jackrabbit.oak.spi.state.NodeState; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| /** |
| * A change dispatcher that pre-fetches visible external changes in a background |
| * task. |
| */ |
| class PrefetchDispatcher extends ChangeDispatcher { |
| |
| private final Executor executor; |
| private NodeState root; |
| |
| public PrefetchDispatcher(@NotNull NodeState root, |
| @NotNull Executor executor) { |
| super(root); |
| this.root = root; |
| this.executor = checkNotNull(executor); |
| } |
| |
| @Override |
| public synchronized void contentChanged(@NotNull NodeState root, |
| @NotNull CommitInfo info) { |
| if (root instanceof DocumentNodeState) { |
| final DocumentNodeState state = (DocumentNodeState) root; |
| if (state.isFromExternalChange()) { |
| executor.execute(new Runnable() { |
| private final NodeState before = PrefetchDispatcher.this.root; |
| @Override |
| public void run() { |
| EditorDiff.process( |
| new VisibleEditor(TraversingEditor.INSTANCE), |
| before, state); |
| } |
| }); |
| } |
| } |
| super.contentChanged(root, info); |
| this.root = root; |
| } |
| |
| private static final class TraversingEditor extends DefaultEditor { |
| |
| static final Editor INSTANCE = new TraversingEditor(); |
| |
| @Override |
| public Editor childNodeAdded(String name, NodeState after) |
| throws CommitFailedException { |
| return this; |
| } |
| |
| @Override |
| public Editor childNodeChanged(String name, |
| NodeState before, |
| NodeState after) |
| throws CommitFailedException { |
| return this; |
| } |
| |
| @Override |
| public Editor childNodeDeleted(String name, NodeState before) |
| throws CommitFailedException { |
| return this; |
| } |
| } |
| } |