| /* |
| * 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.index; |
| |
| /** |
| * A callback event listener for recording key events happened inside IndexWriter |
| * |
| * @lucene.experimental |
| */ |
| public interface IndexWriterEventListener { |
| /** A no-op listener that helps to save null checks */ |
| IndexWriterEventListener NO_OP_LISTENER = |
| new IndexWriterEventListener() { |
| @Override |
| public void beginMergeOnFullFlush(MergePolicy.MergeSpecification merge) {} |
| |
| @Override |
| public void endMergeOnFullFlush(MergePolicy.MergeSpecification merge) {} |
| }; |
| |
| /** |
| * Invoked at the start of merge on commit |
| * |
| * @param merge specification to be tracked |
| */ |
| void beginMergeOnFullFlush(MergePolicy.MergeSpecification merge); |
| |
| /** |
| * Invoked at the end of merge on commit, due to either merge completed, or merge timed out |
| * according to {@link IndexWriterConfig#setMaxFullFlushMergeWaitMillis(long)} |
| * |
| * @param merge specification to be tracked |
| */ |
| void endMergeOnFullFlush(MergePolicy.MergeSpecification merge); |
| } |