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package org.apache.lucene;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import java.io.IOException;
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import org.apache.lucene.util.LuceneTestCase;
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import org.apache.lucene.store.Directory;
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import org.apache.lucene.store.MockDirectoryWrapper;
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import org.apache.lucene.store.RAMDirectory;
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import org.apache.lucene.index.CorruptIndexException;
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import org.apache.lucene.index.IndexWriter;
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import org.apache.lucene.index.IndexWriterConfig;
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import org.apache.lucene.index.LogMergePolicy;
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import org.apache.lucene.index.MergePolicy;
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import org.apache.lucene.index.ConcurrentMergeScheduler;
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import org.apache.lucene.index.MergeScheduler;
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import org.apache.lucene.index.MergePolicy.OneMerge;
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import org.apache.lucene.analysis.MockAnalyzer;
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import org.apache.lucene.document.Document;
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import org.apache.lucene.document.Field;
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* Holds tests cases to verify external APIs are accessible
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* while not being in org.apache.lucene.index package.
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public class TestMergeSchedulerExternal extends LuceneTestCase {
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volatile boolean mergeCalled;
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volatile boolean mergeThreadCreated;
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volatile boolean excCalled;
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private class MyMergeScheduler extends ConcurrentMergeScheduler {
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private class MyMergeThread extends ConcurrentMergeScheduler.MergeThread {
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public MyMergeThread(IndexWriter writer, MergePolicy.OneMerge merge) throws IOException {
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mergeThreadCreated = true;
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protected MergeThread getMergeThread(IndexWriter writer, MergePolicy.OneMerge merge) throws IOException {
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MergeThread thread = new MyMergeThread(writer, merge);
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thread.setThreadPriority(getMergeThreadPriority());
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thread.setDaemon(true);
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thread.setName("MyMergeThread");
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protected void handleMergeException(Throwable t) {
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protected void doMerge(MergePolicy.OneMerge merge) throws IOException {
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private static class FailOnlyOnMerge extends MockDirectoryWrapper.Failure {
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public void eval(MockDirectoryWrapper dir) throws IOException {
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StackTraceElement[] trace = new Exception().getStackTrace();
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for (int i = 0; i < trace.length; i++) {
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if ("doMerge".equals(trace[i].getMethodName()))
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throw new IOException("now failing during merge");
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public void testSubclassConcurrentMergeScheduler() throws IOException {
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MockDirectoryWrapper dir = newDirectory();
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dir.failOn(new FailOnlyOnMerge());
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Document doc = new Document();
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Field idField = newField("id", "", Field.Store.YES, Field.Index.NOT_ANALYZED);
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IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig(
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TEST_VERSION_CURRENT, new MockAnalyzer(random)).setMergeScheduler(new MyMergeScheduler())
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.setMaxBufferedDocs(2).setRAMBufferSizeMB(IndexWriterConfig.DISABLE_AUTO_FLUSH)
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.setMergePolicy(newLogMergePolicy()));
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LogMergePolicy logMP = (LogMergePolicy) writer.getConfig().getMergePolicy();
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logMP.setMergeFactor(10);
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for(int i=0;i<20;i++)
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writer.addDocument(doc);
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((MyMergeScheduler) writer.getConfig().getMergeScheduler()).sync();
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assertTrue(mergeThreadCreated);
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assertTrue(mergeCalled);
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assertTrue(excCalled);
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private static class ReportingMergeScheduler extends MergeScheduler {
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public void merge(IndexWriter writer) throws CorruptIndexException, IOException {
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OneMerge merge = null;
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while ((merge = writer.getNextMerge()) != null) {
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System.out.println("executing merge " + merge.segString(writer.getDirectory()));
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public void close() throws CorruptIndexException, IOException {}
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public void testCustomMergeScheduler() throws Exception {
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// we don't really need to execute anything, just to make sure the custom MS
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// compiles. But ensure that it can be used as well, e.g., no other hidden
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// dependencies or something. Therefore, don't use any random API !
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Directory dir = new RAMDirectory();
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IndexWriterConfig conf = new IndexWriterConfig(TEST_VERSION_CURRENT, null);
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conf.setMergeScheduler(new ReportingMergeScheduler());
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IndexWriter writer = new IndexWriter(dir, conf);
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writer.addDocument(new Document());
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writer.commit(); // trigger flush
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writer.addDocument(new Document());
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writer.commit(); // trigger flush