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;
22 /** <p>Expert: {@link IndexWriter} uses an instance
23 * implementing this interface to execute the merges
24 * selected by a {@link MergePolicy}. The default
25 * MergeScheduler is {@link ConcurrentMergeScheduler}.</p>
27 * @lucene.experimental
29 public abstract class MergeScheduler {
31 /** Run the merges provided by {@link IndexWriter#getNextMerge()}. */
32 public abstract void merge(IndexWriter writer)
33 throws CorruptIndexException, IOException;
35 /** Close this MergeScheduler. */
36 public abstract void close()
37 throws CorruptIndexException, IOException;