1 package org.apache.lucene.index;
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with
6 * this work for additional information regarding copyright ownership.
7 * The ASF licenses this file to You under the Apache License, Version 2.0
8 * (the "License"); you may not use this file except in compliance with
9 * the License. You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
20 import java.io.IOException;
23 * A {@link MergeScheduler} which never executes any merges. It is also a
24 * singleton and can be accessed through {@link NoMergeScheduler#INSTANCE}. Use
25 * it if you want to prevent an {@link IndexWriter} from ever executing merges,
26 * irregardless of the {@link MergePolicy} used. Note that you can achieve the
27 * same thing by using {@link NoMergePolicy}, however with
28 * {@link NoMergeScheduler} you also ensure that no unnecessary code of any
29 * {@link MergeScheduler} implementation is ever executed. Hence it is
30 * recommended to use both if you want to disable merges from ever happening.
32 public final class NoMergeScheduler extends MergeScheduler {
34 /** The single instance of {@link NoMergeScheduler} */
35 public static final MergeScheduler INSTANCE = new NoMergeScheduler();
37 private NoMergeScheduler() {
38 // prevent instantiation
42 public void close() {}
45 public void merge(IndexWriter writer) throws CorruptIndexException, IOException {}