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Elasticsearch subproject :server
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.search.internal;
import org.apache.lucene.search.BulkScorer;
import org.apache.lucene.search.LeafCollector;
import org.apache.lucene.util.Bits;
import java.io.IOException;
import java.util.Objects;
/**
* A {@link BulkScorer} wrapper that runs a {@link Runnable} on a regular basis
* so that the query can be interrupted.
*/
final class CancellableBulkScorer extends BulkScorer {
// we use the BooleanScorer window size as a base interval in order to make sure that we do not
// slow down boolean queries
private static final int INITIAL_INTERVAL = 1 << 11;
// No point in having intervals that are larger than 1M
private static final int MAX_INTERVAL = 1 << 20;
private final BulkScorer scorer;
private final Runnable checkCancelled;
CancellableBulkScorer(BulkScorer scorer, Runnable checkCancelled) {
this.scorer = Objects.requireNonNull(scorer);
this.checkCancelled = Objects.requireNonNull(checkCancelled);
}
@Override
public int score(LeafCollector collector, Bits acceptDocs, int min, int max) throws IOException {
int interval = INITIAL_INTERVAL;
while (min < max) {
checkCancelled.run();
final int newMax = (int) Math.min((long) min + interval, max);
min = scorer.score(collector, acceptDocs, min, newMax);
interval = Math.min(interval << 1, MAX_INTERVAL);
}
checkCancelled.run();
return min;
}
@Override
public long cost() {
return scorer.cost();
}
}