| /* |
| * 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.Collections; |
| |
| import org.apache.jackrabbit.oak.cache.CacheStats; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * A diff cache implementation, which immediately forgets the diff. |
| */ |
| class AmnesiaDiffCache extends DiffCache { |
| |
| static final DiffCache INSTANCE = new AmnesiaDiffCache(); |
| |
| private AmnesiaDiffCache() { |
| super(); |
| } |
| |
| @Override |
| public String getChanges(@NotNull RevisionVector from, |
| @NotNull RevisionVector to, |
| @NotNull Path path, |
| @Nullable Loader loader) { |
| if (loader != null) { |
| return loader.call(); |
| } |
| return null; |
| } |
| |
| @NotNull |
| @Override |
| public Entry newEntry(@NotNull RevisionVector from, @NotNull RevisionVector to, boolean local) { |
| return new Entry() { |
| @Override |
| public void append(@NotNull Path path, @NotNull String changes) { |
| } |
| |
| @Override |
| public boolean done() { |
| return false; |
| } |
| }; |
| } |
| |
| @NotNull |
| @Override |
| public Iterable<CacheStats> getStats() { |
| return Collections.emptyList(); |
| } |
| |
| @Override |
| public void invalidateAll() { |
| // Nothing to do |
| } |
| } |