| /* |
| * 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.lucene.replicator; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.List; |
| import java.util.Map; |
| import org.apache.lucene.store.IndexInput; |
| |
| /** |
| * A revision comprises lists of files that come from different sources and need to be replicated |
| * together to e.g. guarantee that all resources are in sync. In most cases an application will |
| * replicate a single index, and so the revision will contain files from a single source. However, |
| * some applications may require to treat a collection of indexes as a single entity so that the |
| * files from all sources are replicated together, to guarantee consistency between them. For |
| * example, an application which indexes facets will need to replicate both the search and taxonomy |
| * indexes together, to guarantee that they match at the client side. |
| * |
| * @lucene.experimental |
| */ |
| public interface Revision extends Comparable<Revision> { |
| |
| /** |
| * Compares the revision to the given version string. Behaves like {@link |
| * Comparable#compareTo(Object)}. |
| */ |
| public int compareTo(String version); |
| |
| /** |
| * Returns a string representation of the version of this revision. The version is used by {@link |
| * #compareTo(String)} as well as to serialize/deserialize revision information. Therefore it must |
| * be self descriptive as well as be able to identify one revision from another. |
| */ |
| public String getVersion(); |
| |
| /** |
| * Returns the files that comprise this revision, as a mapping from a source to a list of files. |
| */ |
| public Map<String, List<RevisionFile>> getSourceFiles(); |
| |
| /** |
| * Returns an {@link IndexInput} for the given fileName and source. It is the caller's |
| * responsibility to close the {@link IndexInput} when it has been consumed. |
| */ |
| public InputStream open(String source, String fileName) throws IOException; |
| |
| /** |
| * Called when this revision can be safely released, i.e. where there are no more references to |
| * it. |
| */ |
| public void release() throws IOException; |
| } |