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/*
* 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.common.lucene.uid;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.LeafReader;
import org.apache.lucene.index.LeafReader.CoreClosedListener;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.Term;
import org.apache.lucene.util.CloseableThreadLocal;
import org.elasticsearch.common.util.concurrent.ConcurrentCollections;
import org.elasticsearch.index.mapper.internal.UidFieldMapper;
import java.io.IOException;
import java.util.List;
import java.util.concurrent.ConcurrentMap;
/** Utility class to resolve the Lucene doc ID and version for a given uid. */
public class Versions {
/** used to indicate the write operation should succeed regardless of current version **/
public static final long MATCH_ANY = -3L;
/** indicates that the current document was not found in lucene and in the version map */
public static final long NOT_FOUND = -1L;
/**
* used when the document is old and doesn't contain any version information in the index
* see {@link PerThreadIDAndVersionLookup#lookup}
*/
public static final long NOT_SET = -2L;
/**
* used to indicate that the write operation should be executed if the document is currently deleted
* i.e., not found in the index and/or found as deleted (with version) in the version map
*/
public static final long MATCH_DELETED = -4L;
// TODO: is there somewhere else we can store these?
static final ConcurrentMap<Object, CloseableThreadLocal<PerThreadIDAndVersionLookup>> lookupStates = ConcurrentCollections.newConcurrentMapWithAggressiveConcurrency();
// Evict this reader from lookupStates once it's closed:
private static final CoreClosedListener removeLookupState = new CoreClosedListener() {
@Override
public void onClose(Object key) {
CloseableThreadLocal<PerThreadIDAndVersionLookup> ctl = lookupStates.remove(key);
if (ctl != null) {
ctl.close();
}
}
};
private static PerThreadIDAndVersionLookup getLookupState(LeafReader reader) throws IOException {
Object key = reader.getCoreCacheKey();
CloseableThreadLocal<PerThreadIDAndVersionLookup> ctl = lookupStates.get(key);
if (ctl == null) {
// First time we are seeing this reader's core; make a
// new CTL:
ctl = new CloseableThreadLocal<>();
CloseableThreadLocal<PerThreadIDAndVersionLookup> other = lookupStates.putIfAbsent(key, ctl);
if (other == null) {
// Our CTL won, we must remove it when the
// core is closed:
reader.addCoreClosedListener(removeLookupState);
} else {
// Another thread beat us to it: just use
// their CTL:
ctl = other;
}
}
PerThreadIDAndVersionLookup lookupState = ctl.get();
if (lookupState == null) {
lookupState = new PerThreadIDAndVersionLookup(reader);
ctl.set(lookupState);
}
return lookupState;
}
private Versions() {
}
/** Wraps an {@link LeafReaderContext}, a doc ID <b>relative to the context doc base</b> and a version. */
public static class DocIdAndVersion {
public final int docId;
public final long version;
public final LeafReaderContext context;
public DocIdAndVersion(int docId, long version, LeafReaderContext context) {
this.docId = docId;
this.version = version;
this.context = context;
}
}
/**
* Load the internal doc ID and version for the uid from the reader, returning<ul>
* <li>null if the uid wasn't found,
* <li>a doc ID and a version otherwise, the version being potentially set to {@link #NOT_SET} if the uid has no associated version
* </ul>
*/
public static DocIdAndVersion loadDocIdAndVersion(IndexReader reader, Term term) throws IOException {
assert term.field().equals(UidFieldMapper.NAME);
List<LeafReaderContext> leaves = reader.leaves();
if (leaves.isEmpty()) {
return null;
}
// iterate backwards to optimize for the frequently updated documents
// which are likely to be in the last segments
for (int i = leaves.size() - 1; i >= 0; i--) {
LeafReaderContext context = leaves.get(i);
LeafReader leaf = context.reader();
PerThreadIDAndVersionLookup lookup = getLookupState(leaf);
DocIdAndVersion result = lookup.lookup(term.bytes(), leaf.getLiveDocs(), context);
if (result != null) {
return result;
}
}
return null;
}
/**
* Load the version for the uid from the reader, returning<ul>
* <li>{@link #NOT_FOUND} if no matching doc exists,
* <li>{@link #NOT_SET} if no version is available,
* <li>the version associated with the provided uid otherwise
* </ul>
*/
public static long loadVersion(IndexReader reader, Term term) throws IOException {
final DocIdAndVersion docIdAndVersion = loadDocIdAndVersion(reader, term);
return docIdAndVersion == null ? NOT_FOUND : docIdAndVersion.version;
}
}
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