org.apache.solr.index.TestSlowCompositeReaderWrapper.java Source code

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Here is the source code for org.apache.solr.index.TestSlowCompositeReaderWrapper.java

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/*
 * 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.solr.index;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

import org.apache.lucene.document.Document;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.LeafReader;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util.TestUtil;

public class TestSlowCompositeReaderWrapper extends LuceneTestCase {

    public void testCoreListenerOnSlowCompositeReaderWrapper() throws IOException {
        RandomIndexWriter w = new RandomIndexWriter(random(), newDirectory());
        final int numDocs = TestUtil.nextInt(random(), 1, 5);
        for (int i = 0; i < numDocs; ++i) {
            w.addDocument(new Document());
            if (random().nextBoolean()) {
                w.commit();
            }
        }
        w.commit();
        w.close();

        final IndexReader reader = DirectoryReader.open(w.w.getDirectory());
        final LeafReader leafReader = SlowCompositeReaderWrapper.wrap(reader);

        final int numListeners = TestUtil.nextInt(random(), 1, 10);
        final List<LeafReader.CoreClosedListener> listeners = new ArrayList<>();
        AtomicInteger counter = new AtomicInteger(numListeners);

        for (int i = 0; i < numListeners; ++i) {
            CountCoreListener listener = new CountCoreListener(counter, leafReader.getCoreCacheKey());
            listeners.add(listener);
            leafReader.addCoreClosedListener(listener);
        }
        for (int i = 0; i < 100; ++i) {
            leafReader.addCoreClosedListener(listeners.get(random().nextInt(listeners.size())));
        }
        final int removed = random().nextInt(numListeners);
        Collections.shuffle(listeners, random());
        for (int i = 0; i < removed; ++i) {
            leafReader.removeCoreClosedListener(listeners.get(i));
        }
        assertEquals(numListeners, counter.get());
        // make sure listeners are registered on the wrapped reader and that closing any of them has the same effect
        if (random().nextBoolean()) {
            reader.close();
        } else {
            leafReader.close();
        }
        assertEquals(removed, counter.get());
        w.w.getDirectory().close();
    }

    private static final class CountCoreListener implements LeafReader.CoreClosedListener {

        private final AtomicInteger count;
        private final Object coreCacheKey;

        public CountCoreListener(AtomicInteger count, Object coreCacheKey) {
            this.count = count;
            this.coreCacheKey = coreCacheKey;
        }

        @Override
        public void onClose(Object coreCacheKey) {
            assertSame(this.coreCacheKey, coreCacheKey);
            count.decrementAndGet();
        }

    }
}