org.apache.blur.lucene.search.IndexSearcherCloseableBase.java Source code

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Here is the source code for org.apache.blur.lucene.search.IndexSearcherCloseableBase.java

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package org.apache.blur.lucene.search;

/**
 * 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.
 */
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;

import org.apache.blur.trace.Trace;
import org.apache.blur.trace.Tracer;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.CollectionTerminatedException;
import org.apache.lucene.search.Collector;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Scorer;
import org.apache.lucene.search.Weight;
import org.apache.lucene.store.Directory;

public abstract class IndexSearcherCloseableBase extends IndexSearcher implements IndexSearcherCloseable {

    private final ExecutorService _executor;

    public IndexSearcherCloseableBase(IndexReader r, ExecutorService executor) {
        super(r, executor);
        _executor = executor;
    }

    public abstract Directory getDirectory();

    @Override
    public abstract void close() throws IOException;

    protected void search(List<AtomicReaderContext> leaves, Weight weight, Collector collector) throws IOException {
        if (collector instanceof CloneableCollector) {
            CloneableCollector cloneableCollector = (CloneableCollector) collector;
            Collector[] collectors = new Collector[leaves.size()];
            int i = 0;

            if (_executor == null) {
                for (AtomicReaderContext ctx : leaves) { // search each subreader
                    Collector newCollector = cloneableCollector.newCollector();
                    collectors[i++] = newCollector;
                    runSearch(weight, newCollector, ctx);
                }
            } else {
                List<Future<Void>> futures = new ArrayList<Future<Void>>();
                for (AtomicReaderContext ctx : leaves) { // search each subreader
                    Collector newCollector = cloneableCollector.newCollector();
                    collectors[i++] = newCollector;
                    Callable<Void> callable = newSearchCallable(weight, newCollector, ctx);
                    futures.add(_executor.submit(callable));
                }
                for (Future<Void> future : futures) {
                    try {
                        future.get();
                    } catch (InterruptedException e) {
                        throw new IOException(e);
                    } catch (ExecutionException e) {
                        Throwable cause = e.getCause();
                        if (cause instanceof IOException) {
                            throw (IOException) cause;
                        } else {
                            throw new RuntimeException(cause);
                        }
                    }
                }
            }
            cloneableCollector.merge(collectors);
        } else {
            for (AtomicReaderContext ctx : leaves) { // search each subreader
                runSearch(weight, collector, ctx);
            }
        }
    }

    private Callable<Void> newSearchCallable(final Weight weight, final Collector collector,
            final AtomicReaderContext ctx) {
        return new Callable<Void>() {
            @Override
            public Void call() throws Exception {
                runSearch(weight, collector, ctx);
                return null;
            }
        };
    }

    private void runSearch(Weight weight, Collector collector, AtomicReaderContext ctx) throws IOException {
        Tracer trace = Trace.trace("search - internal", Trace.param("AtomicReader", ctx.reader()));
        try {
            try {
                collector.setNextReader(ctx);
            } catch (CollectionTerminatedException e) {
                return;
            }
            Scorer scorer = weight.scorer(ctx, !collector.acceptsDocsOutOfOrder(), true,
                    ctx.reader().getLiveDocs());
            if (scorer != null) {
                try {
                    scorer.score(collector);
                } catch (CollectionTerminatedException e) {
                    // collection was terminated prematurely
                    // continue with the following leaf
                }
            }
        } finally {
            trace.done();
        }
    }

}