/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.engine.query.spi;
import java.io.Serializable;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.jboss.logging.Logger;
import org.hibernate.MappingException;
import org.hibernate.QueryException;
import org.hibernate.cfg.Environment;
import org.hibernate.engine.query.spi.sql.NativeSQLQuerySpecification;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.internal.FilterImpl;
import org.hibernate.internal.util.collections.BoundedConcurrentHashMap;
import org.hibernate.internal.util.collections.CollectionHelper;
import org.hibernate.internal.util.config.ConfigurationHelper;
/**
* Acts as a cache for compiled query plans, as well as query-parameter metadata.
*
* @see Environment#QUERY_PLAN_CACHE_PARAMETER_METADATA_MAX_SIZE
* @see Environment#QUERY_PLAN_CACHE_MAX_SIZE
*
* @author Steve Ebersole
*/
public class QueryPlanCache implements Serializable {
private static final CoreMessageLogger LOG = Logger.getMessageLogger(CoreMessageLogger.class, QueryPlanCache.class.getName());
/**
* The default strong reference count.
*/
public static final int DEFAULT_PARAMETER_METADATA_MAX_COUNT = 128;
/**
* The default soft reference count.
*/
public static final int DEFAULT_QUERY_PLAN_MAX_COUNT = 2048;
private final SessionFactoryImplementor factory;
/**
* the cache of the actual plans...
*/
private final BoundedConcurrentHashMap queryPlanCache;
/**
* simple cache of param metadata based on query string. Ideally, the original "user-supplied query"
* string should be used to obtain this metadata (i.e., not the para-list-expanded query string) to avoid
* unnecessary cache entries.
* <p></p>
* Used solely for caching param metadata for native-sql queries, see {@link #getSQLParameterMetadata} for a
* discussion as to why...
*/
private final BoundedConcurrentHashMap<String,ParameterMetadata> parameterMetadataCache;
public QueryPlanCache(final SessionFactoryImplementor factory) {
this.factory = factory;
Integer maxParameterMetadataCount = ConfigurationHelper.getInteger(
Environment.QUERY_PLAN_CACHE_PARAMETER_METADATA_MAX_SIZE,
factory.getProperties()
);
if ( maxParameterMetadataCount == null ) {
maxParameterMetadataCount = ConfigurationHelper.getInt(
Environment.QUERY_PLAN_CACHE_MAX_STRONG_REFERENCES,
factory.getProperties(),
DEFAULT_PARAMETER_METADATA_MAX_COUNT
);
}
Integer maxQueryPlanCount = ConfigurationHelper.getInteger(
Environment.QUERY_PLAN_CACHE_MAX_SIZE,
factory.getProperties()
);
if ( maxQueryPlanCount == null ) {
maxQueryPlanCount = ConfigurationHelper.getInt(
Environment.QUERY_PLAN_CACHE_MAX_SOFT_REFERENCES,
factory.getProperties(),
DEFAULT_QUERY_PLAN_MAX_COUNT
);
}
queryPlanCache = new BoundedConcurrentHashMap( maxQueryPlanCount, 20, BoundedConcurrentHashMap.Eviction.LIRS );
parameterMetadataCache = new BoundedConcurrentHashMap<String, ParameterMetadata>(
maxParameterMetadataCount,
20,
BoundedConcurrentHashMap.Eviction.LIRS
);
}
/**
* Obtain the parameter metadata for given native-sql query.
* <p/>
* for native-sql queries, the param metadata is determined outside any relation to a query plan, because
* query plan creation and/or retrieval for a native-sql query depends on all of the return types having been
* set, which might not be the case up-front when param metadata would be most useful
*
* @param query The query
* @return The parameter metadata
*/
public ParameterMetadata getSQLParameterMetadata(final String query) {
ParameterMetadata value = parameterMetadataCache.get( query );
if ( value == null ) {
value = buildParameterMetadata( query );
parameterMetadataCache.putIfAbsent( query, value );
}
return value;
}
private ParameterMetadata buildParameterMetadata(String query){
ParamLocationRecognizer recognizer = ParamLocationRecognizer.parseLocations( query );
final int size = recognizer.getOrdinalParameterLocationList().size();
OrdinalParameterDescriptor[] ordinalDescriptors = new OrdinalParameterDescriptor[ size ];
for ( int i = 0; i < size; i++ ) {
final Integer position = recognizer.getOrdinalParameterLocationList().get( i );
ordinalDescriptors[i] = new OrdinalParameterDescriptor( i, null, position );
}
Map<String, NamedParameterDescriptor> namedParamDescriptorMap = new HashMap<String, NamedParameterDescriptor>();
Map<String, ParamLocationRecognizer.NamedParameterDescription> map = recognizer.getNamedParameterDescriptionMap();
for ( final String name : map.keySet() ) {
final ParamLocationRecognizer.NamedParameterDescription description = map.get( name );
namedParamDescriptorMap.put(
name,
new NamedParameterDescriptor(
name,
null,
description.buildPositionsArray(),
description.isJpaStyle()
)
);
}
return new ParameterMetadata( ordinalDescriptors, namedParamDescriptorMap );
}
public HQLQueryPlan getHQLQueryPlan( String queryString, boolean shallow, Map enabledFilters)
throws QueryException, MappingException {
HQLQueryPlanKey key = new HQLQueryPlanKey( queryString, shallow, enabledFilters );
HQLQueryPlan value = (HQLQueryPlan) queryPlanCache.get( key );
if ( value == null ) {
LOG.tracev( "Unable to locate HQL query plan in cache; generating ({0})", queryString );
value = new HQLQueryPlan( queryString, shallow, enabledFilters, factory );
queryPlanCache.putIfAbsent( key, value );
} else {
LOG.tracev( "Located HQL query plan in cache ({0})", queryString );
}
return value;
}
public FilterQueryPlan getFilterQueryPlan(String filterString, String collectionRole, boolean shallow, Map enabledFilters)
throws QueryException, MappingException {
FilterQueryPlanKey key = new FilterQueryPlanKey( filterString, collectionRole, shallow, enabledFilters );
FilterQueryPlan value = (FilterQueryPlan) queryPlanCache.get( key );
if(value == null){
LOG.tracev( "Unable to locate collection-filter query plan in cache; generating ({0} : {1} )",
collectionRole, filterString );
value = new FilterQueryPlan( filterString, collectionRole, shallow, enabledFilters,factory );
queryPlanCache.putIfAbsent( key, value );
} else {
LOG.tracev( "Located collection-filter query plan in cache ({0} : {1})", collectionRole, filterString );
}
return value;
}
public NativeSQLQueryPlan getNativeSQLQueryPlan(final NativeSQLQuerySpecification spec) {
NativeSQLQueryPlan value = (NativeSQLQueryPlan) queryPlanCache.get( spec );
if(value == null){
LOG.tracev( "Unable to locate native-sql query plan in cache; generating ({0})", spec.getQueryString() );
value = new NativeSQLQueryPlan( spec, factory);
queryPlanCache.putIfAbsent( spec, value );
} else {
LOG.tracev( "Located native-sql query plan in cache ({0})", spec.getQueryString() );
}
return value;
}
//clean up QueryPlanCache when Sessionfactory is closed
public void cleanup() {
LOG.trace( "Cleaning QueryPlan Cache" );
queryPlanCache.clear();
parameterMetadataCache.clear();
}
private static class HQLQueryPlanKey implements Serializable {
private final String query;
private final boolean shallow;
private final Set<DynamicFilterKey> filterKeys;
private final int hashCode;
public HQLQueryPlanKey(String query, boolean shallow, Map enabledFilters) {
this.query = query;
this.shallow = shallow;
if ( CollectionHelper.isEmpty( enabledFilters ) ) {
filterKeys = Collections.emptySet();
}
else {
Set<DynamicFilterKey> tmp = new HashSet<DynamicFilterKey>(
CollectionHelper.determineProperSizing( enabledFilters ),
CollectionHelper.LOAD_FACTOR
);
for ( Object o : enabledFilters.values() ) {
tmp.add( new DynamicFilterKey( (FilterImpl) o ) );
}
this.filterKeys = Collections.unmodifiableSet( tmp );
}
int hash = query.hashCode();
hash = 29 * hash + ( shallow ? 1 : 0 );
hash = 29 * hash + filterKeys.hashCode();
this.hashCode = hash;
}
@Override
public boolean equals(Object o) {
if ( this == o ) {
return true;
}
if ( o == null || getClass() != o.getClass() ) {
return false;
}
final HQLQueryPlanKey that = ( HQLQueryPlanKey ) o;
return shallow == that.shallow
&& filterKeys.equals( that.filterKeys )
&& query.equals( that.query );
}
@Override
public int hashCode() {
return hashCode;
}
}
private static class DynamicFilterKey implements Serializable {
private final String filterName;
private final Map<String,Integer> parameterMetadata;
private final int hashCode;
@SuppressWarnings({ "UnnecessaryBoxing" })
private DynamicFilterKey(FilterImpl filter) {
this.filterName = filter.getName();
if ( filter.getParameters().isEmpty() ) {
parameterMetadata = Collections.emptyMap();
}
else {
parameterMetadata = new HashMap<String,Integer>(
CollectionHelper.determineProperSizing( filter.getParameters() ),
CollectionHelper.LOAD_FACTOR
);
for ( Object o : filter.getParameters().entrySet() ) {
final Map.Entry entry = (Map.Entry) o;
final String key = (String) entry.getKey();
final Integer valueCount;
if ( Collection.class.isInstance( entry.getValue() ) ) {
valueCount = ( (Collection) entry.getValue() ).size();
}
else {
valueCount = 1;
}
parameterMetadata.put( key, valueCount );
}
}
int hash = filterName.hashCode();
hash = 31 * hash + parameterMetadata.hashCode();
this.hashCode = hash;
}
@Override
public boolean equals(Object o) {
if ( this == o ) {
return true;
}
if ( o == null || getClass() != o.getClass() ) {
return false;
}
DynamicFilterKey that = ( DynamicFilterKey ) o;
return filterName.equals( that.filterName )
&& parameterMetadata.equals( that.parameterMetadata );
}
@Override
public int hashCode() {
return hashCode;
}
}
private static class FilterQueryPlanKey implements Serializable {
private final String query;
private final String collectionRole;
private final boolean shallow;
private final Set<String> filterNames;
private final int hashCode;
@SuppressWarnings({ "unchecked" })
public FilterQueryPlanKey(String query, String collectionRole, boolean shallow, Map enabledFilters) {
this.query = query;
this.collectionRole = collectionRole;
this.shallow = shallow;
if ( CollectionHelper.isEmpty( enabledFilters ) ) {
this.filterNames = Collections.emptySet();
}
else {
Set<String> tmp = new HashSet<String>();
tmp.addAll( enabledFilters.keySet() );
this.filterNames = Collections.unmodifiableSet( tmp );
}
int hash = query.hashCode();
hash = 29 * hash + collectionRole.hashCode();
hash = 29 * hash + ( shallow ? 1 : 0 );
hash = 29 * hash + filterNames.hashCode();
this.hashCode = hash;
}
@Override
public boolean equals(Object o) {
if ( this == o ) {
return true;
}
if ( o == null || getClass() != o.getClass() ) {
return false;
}
final FilterQueryPlanKey that = ( FilterQueryPlanKey ) o;
return shallow == that.shallow
&& filterNames.equals( that.filterNames )
&& query.equals( that.query )
&& collectionRole.equals( that.collectionRole );
}
@Override
public int hashCode() {
return hashCode;
}
}
}