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HHH-8945 introduced "hibernate.session.initial_capacity" to reduce 

StatefulPersistenceContext's Map#resize calls
This commit is contained in:
Brett Meyer 2014-02-10 15:00:56 -05:00
parent bc8533366a
commit 949adc92c2
2 changed files with 40 additions and 21 deletions
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10
hibernate-core/src/main/java/org/hibernate/cfg/AvailableSettings.java
View File

@ -710,5 +710,15 @@ public interface AvailableSettings {
String LOG_SESSION_METRICS = "hibernate.session.events.log";
String AUTO_SESSION_EVENTS_LISTENER = "hibernate.session.events.auto";
/**
* A {@link org.hibernate.engine.internal.StatefulPersistenceContext} maintains multiple Maps for a Session. For
* performance reasons, it can be desirable to initialize the Maps with a non-default capacity, minimizing the
* occurrences of #resize calls. The capacity generally correlates with the quantity of entities expected to be
* managed by an average Session.
*
* Default: 8
*/
String SESSION_INITIAL_CAPACITY = "hibernate.session.initial_capacity";
}

51
hibernate-core/src/main/java/org/hibernate/engine/internal/StatefulPersistenceContext.java
View File

@ -51,7 +51,9 @@ import org.hibernate.action.spi.AfterTransactionCompletionProcess;
import org.hibernate.cache.spi.NaturalIdCacheKey;
import org.hibernate.cache.spi.access.NaturalIdRegionAccessStrategy;
import org.hibernate.cache.spi.access.SoftLock;
import org.hibernate.cfg.AvailableSettings;
import org.hibernate.collection.spi.PersistentCollection;
import org.hibernate.engine.config.spi.ConfigurationService;
import org.hibernate.engine.loading.internal.LoadContexts;
import org.hibernate.engine.spi.AssociationKey;
import org.hibernate.engine.spi.BatchFetchQueue;
@ -76,7 +78,6 @@ import org.hibernate.proxy.HibernateProxy;
import org.hibernate.proxy.LazyInitializer;
import org.hibernate.tuple.ElementWrapper;
import org.hibernate.type.CollectionType;
import org.jboss.logging.Logger;
/**
@ -96,7 +97,9 @@ public class StatefulPersistenceContext implements PersistenceContext {
);
private static final boolean TRACE_ENABLED = LOG.isTraceEnabled();
private static final int INIT_COLL_SIZE = 8;
private static final int DEFAULT_INITIAL_CAPACITY = 8;
private final int initialCapacity;
private SessionImplementor session;
@ -161,20 +164,23 @@ public class StatefulPersistenceContext implements PersistenceContext {
*/
public StatefulPersistenceContext(SessionImplementor session) {
this.session = session;
initialCapacity = session.getFactory().getServiceRegistry().getService( ConfigurationService.class )
.getSetting( AvailableSettings.SESSION_INITIAL_CAPACITY, Integer.class, DEFAULT_INITIAL_CAPACITY );
entitiesByKey = new HashMap<EntityKey, Object>( INIT_COLL_SIZE );
entitiesByUniqueKey = new HashMap<EntityUniqueKey, Object>( INIT_COLL_SIZE );
entitiesByKey = new HashMap<EntityKey, Object>( initialCapacity );
entitiesByUniqueKey = new HashMap<EntityUniqueKey, Object>( initialCapacity );
//noinspection unchecked
proxiesByKey = new ConcurrentReferenceHashMap<EntityKey, Object>( INIT_COLL_SIZE, .75f, 1, ConcurrentReferenceHashMap.ReferenceType.STRONG, ConcurrentReferenceHashMap.ReferenceType.WEAK, null );
entitySnapshotsByKey = new HashMap<EntityKey, Object>( INIT_COLL_SIZE );
proxiesByKey = new ConcurrentReferenceHashMap<EntityKey, Object>( initialCapacity, .75f, 1, ConcurrentReferenceHashMap.ReferenceType.STRONG, ConcurrentReferenceHashMap.ReferenceType.WEAK, null );
entitySnapshotsByKey = new HashMap<EntityKey, Object>( initialCapacity );
entityEntryContext = new EntityEntryContext();
// entityEntries = IdentityMap.instantiateSequenced( INIT_COLL_SIZE );
collectionEntries = IdentityMap.instantiateSequenced( INIT_COLL_SIZE );
parentsByChild = new IdentityHashMap<Object,Object>( INIT_COLL_SIZE );
// entityEntries = IdentityMap.instantiateSequenced( initialCapacity );
collectionEntries = IdentityMap.instantiateSequenced( initialCapacity );
parentsByChild = new IdentityHashMap<Object,Object>( initialCapacity );
collectionsByKey = new HashMap<CollectionKey, PersistentCollection>( INIT_COLL_SIZE );
arrayHolders = new IdentityHashMap<Object, PersistentCollection>( INIT_COLL_SIZE );
collectionsByKey = new HashMap<CollectionKey, PersistentCollection>( initialCapacity );
arrayHolders = new IdentityHashMap<Object, PersistentCollection>( initialCapacity );
nullifiableEntityKeys = new HashSet<EntityKey>();
@ -182,8 +188,8 @@ public class StatefulPersistenceContext implements PersistenceContext {
}
private void initTransientState() {
nullAssociations = new HashSet<AssociationKey>( INIT_COLL_SIZE );
nonlazyCollections = new ArrayList<PersistentCollection>( INIT_COLL_SIZE );
nullAssociations = new HashSet<AssociationKey>( initialCapacity );
nonlazyCollections = new ArrayList<PersistentCollection>( initialCapacity );
}
@Override
@ -207,7 +213,7 @@ public class StatefulPersistenceContext implements PersistenceContext {
@Override
public void addUnownedCollection(CollectionKey key, PersistentCollection collection) {
if (unownedCollections==null) {
unownedCollections = new HashMap<CollectionKey,PersistentCollection>(INIT_COLL_SIZE);
unownedCollections = new HashMap<CollectionKey,PersistentCollection>(initialCapacity);
}
unownedCollections.put( key, collection );
}
@ -1441,6 +1447,9 @@ public class StatefulPersistenceContext implements PersistenceContext {
}
final StatefulPersistenceContext rtn = new StatefulPersistenceContext( session );
SessionFactoryImplementor sfi = session.getFactory();
int initialCapacity = sfi.getServiceRegistry().getService( ConfigurationService.class )
.getSetting( AvailableSettings.SESSION_INITIAL_CAPACITY, Integer.class, DEFAULT_INITIAL_CAPACITY );
// during deserialization, we need to reconnect all proxies and
// collections to this session, as well as the EntityEntry and
@ -1456,7 +1465,7 @@ public class StatefulPersistenceContext implements PersistenceContext {
if ( tracing ) {
LOG.trace( "Starting deserialization of [" + count + "] entitiesByKey entries" );
}
rtn.entitiesByKey = new HashMap<EntityKey,Object>( count < INIT_COLL_SIZE ? INIT_COLL_SIZE : count );
rtn.entitiesByKey = new HashMap<EntityKey,Object>( count < initialCapacity ? initialCapacity : count );
for ( int i = 0; i < count; i++ ) {
rtn.entitiesByKey.put( EntityKey.deserialize( ois, sfi ), ois.readObject() );
}
@ -1465,7 +1474,7 @@ public class StatefulPersistenceContext implements PersistenceContext {
if ( tracing ) {
LOG.trace( "Starting deserialization of [" + count + "] entitiesByUniqueKey entries" );
}
rtn.entitiesByUniqueKey = new HashMap<EntityUniqueKey,Object>( count < INIT_COLL_SIZE ? INIT_COLL_SIZE : count );
rtn.entitiesByUniqueKey = new HashMap<EntityUniqueKey,Object>( count < initialCapacity ? initialCapacity : count );
for ( int i = 0; i < count; i++ ) {
rtn.entitiesByUniqueKey.put( EntityUniqueKey.deserialize( ois, session ), ois.readObject() );
}
@ -1476,7 +1485,7 @@ public class StatefulPersistenceContext implements PersistenceContext {
}
//noinspection unchecked
rtn.proxiesByKey = new ConcurrentReferenceHashMap<EntityKey, Object>(
count < INIT_COLL_SIZE ? INIT_COLL_SIZE : count,
count < initialCapacity ? initialCapacity : count,
.75f,
1,
ConcurrentReferenceHashMap.ReferenceType.STRONG,
@ -1502,7 +1511,7 @@ public class StatefulPersistenceContext implements PersistenceContext {
if ( tracing ) {
LOG.trace( "Starting deserialization of [" + count + "] entitySnapshotsByKey entries" );
}
rtn.entitySnapshotsByKey = new HashMap<EntityKey,Object>( count < INIT_COLL_SIZE ? INIT_COLL_SIZE : count );
rtn.entitySnapshotsByKey = new HashMap<EntityKey,Object>( count < initialCapacity ? initialCapacity : count );
for ( int i = 0; i < count; i++ ) {
rtn.entitySnapshotsByKey.put( EntityKey.deserialize( ois, sfi ), ois.readObject() );
}
@ -1513,7 +1522,7 @@ public class StatefulPersistenceContext implements PersistenceContext {
if ( tracing ) {
LOG.trace( "Starting deserialization of [" + count + "] collectionsByKey entries" );
}
rtn.collectionsByKey = new HashMap<CollectionKey,PersistentCollection>( count < INIT_COLL_SIZE ? INIT_COLL_SIZE : count );
rtn.collectionsByKey = new HashMap<CollectionKey,PersistentCollection>( count < initialCapacity ? initialCapacity : count );
for ( int i = 0; i < count; i++ ) {
rtn.collectionsByKey.put( CollectionKey.deserialize( ois, session ), (PersistentCollection) ois.readObject() );
}
@ -1522,7 +1531,7 @@ public class StatefulPersistenceContext implements PersistenceContext {
if ( tracing ) {
LOG.trace( "Starting deserialization of [" + count + "] collectionEntries entries" );
}
rtn.collectionEntries = IdentityMap.instantiateSequenced( count < INIT_COLL_SIZE ? INIT_COLL_SIZE : count );
rtn.collectionEntries = IdentityMap.instantiateSequenced( count < initialCapacity ? initialCapacity : count );
for ( int i = 0; i < count; i++ ) {
final PersistentCollection pc = (PersistentCollection) ois.readObject();
final CollectionEntry ce = CollectionEntry.deserialize( ois, session );
@ -1534,7 +1543,7 @@ public class StatefulPersistenceContext implements PersistenceContext {
if ( tracing ) {
LOG.trace( "Starting deserialization of [" + count + "] arrayHolders entries" );
}
rtn.arrayHolders = new IdentityHashMap<Object, PersistentCollection>( count < INIT_COLL_SIZE ? INIT_COLL_SIZE : count );
rtn.arrayHolders = new IdentityHashMap<Object, PersistentCollection>( count < initialCapacity ? initialCapacity : count );
for ( int i = 0; i < count; i++ ) {
rtn.arrayHolders.put( ois.readObject(), (PersistentCollection) ois.readObject() );
}