/*
* ModeShape (http://www.modeshape.org)
*
* Licensed 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.modeshape.jcr.index.local;
import java.util.Comparator;
import java.util.concurrent.atomic.AtomicLong;
import javax.jcr.query.qom.StaticOperand;
import org.mapdb.DB;
import org.mapdb.Fun;
import org.mapdb.Serializer;
import org.modeshape.common.logging.Logger;
import org.modeshape.jcr.cache.NodeKey;
import org.modeshape.jcr.index.local.IndexValues.Converter;
import org.modeshape.jcr.index.local.MapDB.UniqueKey;
import org.modeshape.jcr.spi.index.Index;
/**
* An {@link Index} that associates a single value with multiple {@link NodeKey}s. All values are stored in natural sort order,
* allowing finding all the node keys for a range of values.
*
* @param <T> the type of values
* @author Randall Hauch (rhauch@redhat.com)
*/
final class LocalDuplicateIndex<T> extends LocalMapIndex<UniqueKey<T>, T> {
/**
* Create a new index that allows duplicate values across all keys.
*
* @param name the name of the index; may not be null or empty
* @param workspaceName the name of the workspace; may not be null
* @param db the database in which the index information is to be stored; may not be null
* @param converter the converter from {@link StaticOperand} to values being indexed; may not be null
* @param valueSerializer the serializer for the type of value being indexed
* @param comparator the comparator for the values; may not be null
* @return the new index; never null
*/
static <T> LocalDuplicateIndex<T> create( String name,
String workspaceName,
DB db,
Converter<T> converter,
Serializer<T> valueSerializer,
Comparator<T> comparator ) {
return new LocalDuplicateIndex<>(name, workspaceName, db, converter, valueSerializer, comparator);
}
private static final String NEXT_COUNTER = "next-counter";
private final Logger logger = Logger.getLogger(getClass());
private final AtomicLong counter;
protected LocalDuplicateIndex( String name,
String workspaceName,
DB db,
Converter<T> converter,
Serializer<T> valueSerializer,
Comparator<T> comparator ) {
super(name, workspaceName, db, IndexValues.uniqueKeyConverter(converter), MapDB.uniqueKeyBTreeSerializer(valueSerializer,
comparator),
MapDB.uniqueKeySerializer(valueSerializer, comparator));
Long nextCounter = (Long)options.get(NEXT_COUNTER);
this.counter = new AtomicLong(nextCounter != null ? nextCounter : -1L);
}
@Override
public void add( String nodeKey,
String propertyName,
T value ) {
logger.trace("Adding node '{0}' to '{1}' index with value '{2}'", nodeKey, name, value);
// Store the value of the next counter in the options map first so in the case of a failure we'll pick up at least from there
long nextId = (long) options.compute(NEXT_COUNTER, (key, val) -> counter.incrementAndGet());
// then store the data in the index
keysByValue.compute(new UniqueKey<T>(value, nextId), (key, val) -> nodeKey);
}
@Override
public void remove( String nodeKey,
String propertyName,
T value ) {
// Find all of the T values (entry keys) for the given node key (entry values) and remove those which have value 'value'
for (UniqueKey<T> key : Fun.filter(valuesByKey, nodeKey)) {
if (key.actualKey.equals(value)) {
logger.trace("Removing node '{0}' from '{1}' index with value '{2}'", nodeKey, name, key.actualKey);
keysByValue.remove(key);
}
}
}
@Override
public void remove( String nodeKey ) {
// Find all of the T values (entry keys) for the given node key (entry values) ...
for (UniqueKey<T> key : Fun.filter(valuesByKey, nodeKey)) {
logger.trace("Removing node '{0}' from '{1}' index with value '{2}'", nodeKey, name, key.actualKey);
keysByValue.remove(key);
}
}
}