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/*
* 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.spi;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;
import java.util.Set;
import java.util.concurrent.ConcurrentLinkedQueue;
import org.jboss.logging.Logger;
import org.hibernate.AssertionFailure;
import org.hibernate.HibernateException;
import org.hibernate.PropertyValueException;
import org.hibernate.action.internal.AbstractEntityInsertAction;
import org.hibernate.action.internal.BulkOperationCleanupAction;
import org.hibernate.action.internal.CollectionAction;
import org.hibernate.action.internal.CollectionRecreateAction;
import org.hibernate.action.internal.CollectionRemoveAction;
import org.hibernate.action.internal.CollectionUpdateAction;
import org.hibernate.action.internal.EntityAction;
import org.hibernate.action.internal.EntityDeleteAction;
import org.hibernate.action.internal.EntityIdentityInsertAction;
import org.hibernate.action.internal.EntityInsertAction;
import org.hibernate.action.internal.EntityUpdateAction;
import org.hibernate.action.internal.QueuedOperationCollectionAction;
import org.hibernate.action.internal.UnresolvedEntityInsertActions;
import org.hibernate.action.spi.AfterTransactionCompletionProcess;
import org.hibernate.action.spi.BeforeTransactionCompletionProcess;
import org.hibernate.action.spi.Executable;
import org.hibernate.cache.CacheException;
import org.hibernate.engine.internal.NonNullableTransientDependencies;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.type.Type;
/**
* Responsible for maintaining the queue of actions related to events.
*
* The ActionQueue holds the DML operations queued as part of a session's
* transactional-write-behind semantics. DML operations are queued here
* until a flush forces them to be executed against the database.
*
* @author Steve Ebersole
* @author Gail Badner
*/
public class ActionQueue {
static final CoreMessageLogger LOG = Logger.getMessageLogger(CoreMessageLogger.class, ActionQueue.class.getName());
private static final int INIT_QUEUE_LIST_SIZE = 5;
private SessionImplementor session;
// Object insertions, updates, and deletions have list semantics because
// they must happen in the right order so as to respect referential
// integrity
private UnresolvedEntityInsertActions unresolvedInsertions;
private ArrayList insertions;
private ArrayList deletions;
private ArrayList updates;
// Actually the semantics of the next three are really "Bag"
// Note that, unlike objects, collection insertions, updates,
// deletions are not really remembered between flushes. We
// just re-use the same Lists for convenience.
private ArrayList collectionCreations;
private ArrayList collectionUpdates;
private ArrayList collectionQueuedOps;
private ArrayList collectionRemovals;
private AfterTransactionCompletionProcessQueue afterTransactionProcesses;
private BeforeTransactionCompletionProcessQueue beforeTransactionProcesses;
/**
* Constructs an action queue bound to the given session.
*
* @param session The session "owning" this queue.
*/
public ActionQueue(SessionImplementor session) {
this.session = session;
init();
}
private void init() {
unresolvedInsertions = new UnresolvedEntityInsertActions();
insertions = new ArrayList( INIT_QUEUE_LIST_SIZE );
deletions = new ArrayList( INIT_QUEUE_LIST_SIZE );
updates = new ArrayList( INIT_QUEUE_LIST_SIZE );
collectionCreations = new ArrayList( INIT_QUEUE_LIST_SIZE );
collectionRemovals = new ArrayList( INIT_QUEUE_LIST_SIZE );
collectionUpdates = new ArrayList( INIT_QUEUE_LIST_SIZE );
collectionQueuedOps = new ArrayList( INIT_QUEUE_LIST_SIZE );
afterTransactionProcesses = new AfterTransactionCompletionProcessQueue( session );
beforeTransactionProcesses = new BeforeTransactionCompletionProcessQueue( session );
}
public void clear() {
updates.clear();
insertions.clear();
deletions.clear();
collectionCreations.clear();
collectionRemovals.clear();
collectionUpdates.clear();
collectionQueuedOps.clear();
unresolvedInsertions.clear();
}
@SuppressWarnings({ "unchecked" })
public void addAction(EntityInsertAction action) {
LOG.tracev( "Adding an EntityInsertAction for [{0}] object", action.getEntityName() );
addInsertAction( action );
}
@SuppressWarnings({ "unchecked" })
public void addAction(EntityDeleteAction action) {
deletions.add( action );
}
@SuppressWarnings({ "unchecked" })
public void addAction(EntityUpdateAction action) {
updates.add( action );
}
@SuppressWarnings({ "unchecked" })
public void addAction(CollectionRecreateAction action) {
collectionCreations.add( action );
}
@SuppressWarnings({ "unchecked" })
public void addAction(CollectionRemoveAction action) {
collectionRemovals.add( action );
}
@SuppressWarnings({ "unchecked" })
public void addAction(CollectionUpdateAction action) {
collectionUpdates.add( action );
}
@SuppressWarnings({ "unchecked" })
public void addAction(QueuedOperationCollectionAction action) {
collectionQueuedOps.add( action );
}
@SuppressWarnings({ "unchecked" })
public void addAction(EntityIdentityInsertAction insert) {
LOG.tracev( "Adding an EntityIdentityInsertAction for [{0}] object", insert.getEntityName() );
addInsertAction( insert );
}
private void addInsertAction(AbstractEntityInsertAction insert) {
if ( insert.isEarlyInsert() ) {
// For early inserts, must execute inserts before finding non-nullable transient entities.
// TODO: find out why this is necessary
LOG.tracev(
"Executing inserts before finding non-nullable transient entities for early insert: [{0}]",
insert
);
executeInserts();
}
NonNullableTransientDependencies nonNullableTransientDependencies = insert.findNonNullableTransientEntities();
if ( nonNullableTransientDependencies == null ) {
LOG.tracev( "Adding insert with no non-nullable, transient entities: [{0}]", insert);
addResolvedEntityInsertAction( insert );
}
else {
if ( LOG.isTraceEnabled() ) {
LOG.tracev(
"Adding insert with non-nullable, transient entities; insert=[{0}], dependencies=[{1}]",
insert,
nonNullableTransientDependencies.toLoggableString( insert.getSession() )
);
}
unresolvedInsertions.addUnresolvedEntityInsertAction( insert, nonNullableTransientDependencies );
}
}
@SuppressWarnings({ "unchecked" })
private void addResolvedEntityInsertAction(AbstractEntityInsertAction insert) {
if ( insert.isEarlyInsert() ) {
LOG.trace( "Executing insertions before resolved early-insert" );
executeInserts();
LOG.debug( "Executing identity-insert immediately" );
execute( insert );
}
else {
LOG.trace( "Adding resolved non-early insert action." );
insertions.add( insert );
}
insert.makeEntityManaged();
for ( AbstractEntityInsertAction resolvedAction :
unresolvedInsertions.resolveDependentActions( insert.getInstance(), session ) ) {
addResolvedEntityInsertAction( resolvedAction );
}
}
/**
* Are there unresolved entity insert actions that depend on non-nullable
* associations with a transient entity?
* @return true, if there are unresolved entity insert actions that depend on
* non-nullable associations with a transient entity;
* false, otherwise
*/
public boolean hasUnresolvedEntityInsertActions() {
return ! unresolvedInsertions.isEmpty();
}
/**
* Throws {@link org.hibernate.PropertyValueException} if there are any unresolved
* entity insert actions that depend on non-nullable associations with
* a transient entity. This method should be called on completion of
* an operation (after all cascades are completed) that saves an entity.
*
* @throws org.hibernate.PropertyValueException if there are any unresolved entity
* insert actions; {@link org.hibernate.PropertyValueException#getEntityName()}
* and {@link org.hibernate.PropertyValueException#getPropertyName()} will
* return the entity name and property value for the first unresolved
* entity insert action.
*/
public void checkNoUnresolvedActionsAfterOperation() throws PropertyValueException {
unresolvedInsertions.checkNoUnresolvedActionsAfterOperation();
}
public void addAction(BulkOperationCleanupAction cleanupAction) {
registerCleanupActions( cleanupAction );
}
public void registerProcess(AfterTransactionCompletionProcess process) {
afterTransactionProcesses.register( process );
}
public void registerProcess(BeforeTransactionCompletionProcess process) {
beforeTransactionProcesses.register( process );
}
/**
* Perform all currently queued entity-insertion actions.
*
* @throws HibernateException error executing queued insertion actions.
*/
public void executeInserts() throws HibernateException {
executeActions( insertions );
}
/**
* Perform all currently queued actions.
*
* @throws HibernateException error executing queued actions.
*/
public void executeActions() throws HibernateException {
if ( ! unresolvedInsertions.isEmpty() ) {
throw new IllegalStateException(
"About to execute actions, but there are unresolved entity insert actions."
);
}
executeActions( insertions );
executeActions( updates );
// do before actions are handled in the other collection queues
executeActions( collectionQueuedOps );
executeActions( collectionRemovals );
executeActions( collectionUpdates );
executeActions( collectionCreations );
executeActions( deletions );
}
/**
* Prepares the internal action queues for execution.
*
* @throws HibernateException error preparing actions.
*/
public void prepareActions() throws HibernateException {
prepareActions( collectionRemovals );
prepareActions( collectionUpdates );
prepareActions( collectionCreations );
prepareActions( collectionQueuedOps );
}
/**
* Performs cleanup of any held cache softlocks.
*
* @param success Was the transaction successful.
*/
public void afterTransactionCompletion(boolean success) {
afterTransactionProcesses.afterTransactionCompletion( success );
}
/**
* Execute any registered {@link org.hibernate.action.spi.BeforeTransactionCompletionProcess}
*/
public void beforeTransactionCompletion() {
beforeTransactionProcesses.beforeTransactionCompletion();
}
/**
* Check whether the given tables/query-spaces are to be executed against
* given the currently queued actions.
*
* @param tables The table/query-spaces to check.
*
* @return True if we contain pending actions against any of the given
* tables; false otherwise.
*/
public boolean areTablesToBeUpdated(Set tables) {
return areTablesToUpdated( updates, tables ) ||
areTablesToUpdated( insertions, tables ) ||
areTablesToUpdated( unresolvedInsertions.getDependentEntityInsertActions(), tables ) ||
areTablesToUpdated( deletions, tables ) ||
areTablesToUpdated( collectionUpdates, tables ) ||
areTablesToUpdated( collectionCreations, tables ) ||
areTablesToUpdated( collectionQueuedOps, tables ) ||
areTablesToUpdated( collectionRemovals, tables );
}
/**
* Check whether any insertion or deletion actions are currently queued.
*
* @return True if insertions or deletions are currently queued; false otherwise.
*/
public boolean areInsertionsOrDeletionsQueued() {
return ( insertions.size() > 0 || ! unresolvedInsertions.isEmpty() || deletions.size() > 0 );
}
@SuppressWarnings({ "unchecked" })
private static boolean areTablesToUpdated(Iterable actions, Set tableSpaces) {
for ( Executable action : (Iterable) actions ) {
final Serializable[] spaces = action.getPropertySpaces();
for ( Serializable space : spaces ) {
if ( tableSpaces.contains( space ) ) {
LOG.debugf( "Changes must be flushed to space: %s", space );
return true;
}
}
}
return false;
}
private void executeActions(List list) throws HibernateException {
for ( Object aList : list ) {
execute( (Executable) aList );
}
list.clear();
session.getTransactionCoordinator().getJdbcCoordinator().executeBatch();
}
public void execute(Executable executable) {
try {
executable.execute();
}
finally {
registerCleanupActions( executable );
}
}
private void registerCleanupActions(Executable executable) {
beforeTransactionProcesses.register( executable.getBeforeTransactionCompletionProcess() );
if ( session.getFactory().getSettings().isQueryCacheEnabled() ) {
final String[] spaces = (String[]) executable.getPropertySpaces();
if ( spaces != null && spaces.length > 0 ) { //HHH-6286
afterTransactionProcesses.addSpacesToInvalidate( spaces );
session.getFactory().getUpdateTimestampsCache().preinvalidate( spaces );
}
}
afterTransactionProcesses.register( executable.getAfterTransactionCompletionProcess() );
}
@SuppressWarnings({ "unchecked" })
private void prepareActions(List queue) throws HibernateException {
for ( Executable executable : (List) queue ) {
executable.beforeExecutions();
}
}
/**
* Returns a string representation of the object.
*
* @return a string representation of the object.
*/
@Override
public String toString() {
return new StringBuilder()
.append( "ActionQueue[insertions=" ).append( insertions )
.append( " updates=" ).append( updates )
.append( " deletions=" ).append( deletions )
.append( " collectionCreations=" ).append( collectionCreations )
.append( " collectionRemovals=" ).append( collectionRemovals )
.append( " collectionUpdates=" ).append( collectionUpdates )
.append( " collectionQueuedOps=" ).append( collectionQueuedOps )
.append( " unresolvedInsertDependencies=" ).append( unresolvedInsertions )
.append( "]" )
.toString();
}
public int numberOfCollectionRemovals() {
return collectionRemovals.size();
}
public int numberOfCollectionUpdates() {
return collectionUpdates.size();
}
public int numberOfCollectionCreations() {
return collectionCreations.size();
}
public int numberOfDeletions() {
return deletions.size();
}
public int numberOfUpdates() {
return updates.size();
}
public int numberOfInsertions() {
return insertions.size();
}
@SuppressWarnings({ "unchecked" })
public void sortCollectionActions() {
if ( session.getFactory().getSettings().isOrderUpdatesEnabled() ) {
//sort the updates by fk
java.util.Collections.sort( collectionCreations );
java.util.Collections.sort( collectionUpdates );
java.util.Collections.sort( collectionQueuedOps );
java.util.Collections.sort( collectionRemovals );
}
}
@SuppressWarnings({ "unchecked" })
public void sortActions() {
if ( session.getFactory().getSettings().isOrderUpdatesEnabled() ) {
//sort the updates by pk
java.util.Collections.sort( updates );
}
if ( session.getFactory().getSettings().isOrderInsertsEnabled() ) {
sortInsertActions();
}
}
/**
* Order the {@link #insertions} queue such that we group inserts
* against the same entity together (without violating constraints). The
* original order is generated by cascade order, which in turn is based on
* the directionality of foreign-keys. So even though we will be changing
* the ordering here, we need to make absolutely certain that we do not
* circumvent this FK ordering to the extent of causing constraint
* violations
*/
private void sortInsertActions() {
new InsertActionSorter().sort();
}
@SuppressWarnings({ "UnusedDeclaration" })
public ArrayList cloneDeletions() {
return ( ArrayList ) deletions.clone();
}
public void clearFromFlushNeededCheck(int previousCollectionRemovalSize) {
collectionCreations.clear();
collectionUpdates.clear();
collectionQueuedOps.clear();
updates.clear();
// collection deletions are a special case since update() can add
// deletions of collections not loaded by the session.
for ( int i = collectionRemovals.size() - 1; i >= previousCollectionRemovalSize; i-- ) {
collectionRemovals.remove( i );
}
}
@SuppressWarnings({ "UnusedDeclaration" })
public boolean hasAfterTransactionActions() {
return afterTransactionProcesses.processes.size() > 0;
}
public boolean hasBeforeTransactionActions() {
return beforeTransactionProcesses.processes.size() > 0;
}
public boolean hasAnyQueuedActions() {
return updates.size() > 0 ||
insertions.size() > 0 ||
! unresolvedInsertions.isEmpty() ||
deletions.size() > 0 ||
collectionUpdates.size() > 0 ||
collectionQueuedOps.size() > 0 ||
collectionRemovals.size() > 0 ||
collectionCreations.size() > 0;
}
public void unScheduleDeletion(EntityEntry entry, Object rescuedEntity) {
for ( int i = 0; i < deletions.size(); i++ ) {
EntityDeleteAction action = deletions.get( i );
if ( action.getInstance() == rescuedEntity ) {
deletions.remove( i );
return;
}
}
throw new AssertionFailure( "Unable to perform un-delete for instance " + entry.getEntityName() );
}
/**
* Used by the owning session to explicitly control serialization of the
* action queue
*
* @param oos The stream to which the action queue should get written
*
* @throws IOException Indicates an error writing to the stream
*/
public void serialize(ObjectOutputStream oos) throws IOException {
LOG.trace( "Serializing action-queue" );
unresolvedInsertions.serialize( oos );
int queueSize = insertions.size();
LOG.tracev( "Starting serialization of [{0}] insertions entries", queueSize );
oos.writeInt( queueSize );
for ( int i = 0; i < queueSize; i++ ) {
oos.writeObject( insertions.get( i ) );
}
queueSize = deletions.size();
LOG.tracev( "Starting serialization of [{0}] deletions entries", queueSize );
oos.writeInt( queueSize );
for ( int i = 0; i < queueSize; i++ ) {
oos.writeObject( deletions.get( i ) );
}
queueSize = updates.size();
LOG.tracev( "Starting serialization of [{0}] updates entries", queueSize );
oos.writeInt( queueSize );
for ( int i = 0; i < queueSize; i++ ) {
oos.writeObject( updates.get( i ) );
}
queueSize = collectionUpdates.size();
LOG.tracev( "Starting serialization of [{0}] collectionUpdates entries", queueSize );
oos.writeInt( queueSize );
for ( int i = 0; i < queueSize; i++ ) {
oos.writeObject( collectionUpdates.get( i ) );
}
queueSize = collectionRemovals.size();
LOG.tracev( "Starting serialization of [{0}] collectionRemovals entries", queueSize );
oos.writeInt( queueSize );
for ( int i = 0; i < queueSize; i++ ) {
oos.writeObject( collectionRemovals.get( i ) );
}
queueSize = collectionCreations.size();
LOG.tracev( "Starting serialization of [{0}] collectionCreations entries", queueSize );
oos.writeInt( queueSize );
for ( int i = 0; i < queueSize; i++ ) {
oos.writeObject( collectionCreations.get( i ) );
}
queueSize = collectionQueuedOps.size();
LOG.tracev( "Starting serialization of [{0}] collectionQueuedOps entries", queueSize );
oos.writeInt( queueSize );
for ( int i = 0; i < queueSize; i++ ) {
oos.writeObject( collectionQueuedOps.get( i ) );
}
}
/**
* Used by the owning session to explicitly control deserialization of the
* action queue
*
* @param ois The stream from which to read the action queue
* @param session The session to which the action queue belongs
*
* @return The deserialized action queue
*
* @throws IOException indicates a problem reading from the stream
* @throws ClassNotFoundException Generally means we were unable to locate user classes.
*/
@SuppressWarnings({ "unchecked" })
public static ActionQueue deserialize(
ObjectInputStream ois,
SessionImplementor session) throws IOException, ClassNotFoundException {
LOG.trace( "Dedeserializing action-queue" );
ActionQueue rtn = new ActionQueue( session );
rtn.unresolvedInsertions = UnresolvedEntityInsertActions.deserialize( ois, session );
int queueSize = ois.readInt();
LOG.tracev( "Starting deserialization of [{0}] insertions entries", queueSize );
rtn.insertions = new ArrayList( queueSize );
for ( int i = 0; i < queueSize; i++ ) {
EntityAction action = ( EntityAction ) ois.readObject();
action.afterDeserialize( session );
rtn.insertions.add( action );
}
queueSize = ois.readInt();
LOG.tracev( "Starting deserialization of [{0}] deletions entries", queueSize );
rtn.deletions = new ArrayList( queueSize );
for ( int i = 0; i < queueSize; i++ ) {
EntityDeleteAction action = ( EntityDeleteAction ) ois.readObject();
action.afterDeserialize( session );
rtn.deletions.add( action );
}
queueSize = ois.readInt();
LOG.tracev( "Starting deserialization of [{0}] updates entries", queueSize );
rtn.updates = new ArrayList( queueSize );
for ( int i = 0; i < queueSize; i++ ) {
EntityAction action = ( EntityAction ) ois.readObject();
action.afterDeserialize( session );
rtn.updates.add( action );
}
queueSize = ois.readInt();
LOG.tracev( "Starting deserialization of [{0}] collectionUpdates entries", queueSize );
rtn.collectionUpdates = new ArrayList( queueSize );
for ( int i = 0; i < queueSize; i++ ) {
CollectionAction action = (CollectionAction) ois.readObject();
action.afterDeserialize( session );
rtn.collectionUpdates.add( action );
}
queueSize = ois.readInt();
LOG.tracev( "Starting deserialization of [{0}] collectionRemovals entries", queueSize );
rtn.collectionRemovals = new ArrayList( queueSize );
for ( int i = 0; i < queueSize; i++ ) {
CollectionAction action = ( CollectionAction ) ois.readObject();
action.afterDeserialize( session );
rtn.collectionRemovals.add( action );
}
queueSize = ois.readInt();
LOG.tracev( "Starting deserialization of [{0}] collectionCreations entries", queueSize );
rtn.collectionCreations = new ArrayList( queueSize );
for ( int i = 0; i < queueSize; i++ ) {
CollectionAction action = ( CollectionAction ) ois.readObject();
action.afterDeserialize( session );
rtn.collectionCreations.add( action );
}
queueSize = ois.readInt();
LOG.tracev( "Starting deserialization of [{0}] collectionQueuedOps entries", queueSize );
rtn.collectionQueuedOps = new ArrayList( queueSize );
for ( int i = 0; i < queueSize; i++ ) {
CollectionAction action = ( CollectionAction ) ois.readObject();
action.afterDeserialize( session );
rtn.collectionQueuedOps.add( action );
}
return rtn;
}
private static class BeforeTransactionCompletionProcessQueue {
private SessionImplementor session;
// Concurrency handling required when transaction completion process is dynamically registered
// inside event listener (HHH-7478).
private Queue processes = new ConcurrentLinkedQueue();
private BeforeTransactionCompletionProcessQueue(SessionImplementor session) {
this.session = session;
}
public void register(BeforeTransactionCompletionProcess process) {
if ( process == null ) {
return;
}
processes.add( process );
}
public void beforeTransactionCompletion() {
for ( BeforeTransactionCompletionProcess process : processes ) {
try {
process.doBeforeTransactionCompletion( session );
}
catch (HibernateException he) {
throw he;
}
catch (Exception e) {
throw new AssertionFailure( "Unable to perform beforeTransactionCompletion callback", e );
}
}
processes.clear();
}
}
private static class AfterTransactionCompletionProcessQueue {
private SessionImplementor session;
private Set querySpacesToInvalidate = new HashSet();
// Concurrency handling required when transaction completion process is dynamically registered
// inside event listener (HHH-7478).
private Queue processes = new ConcurrentLinkedQueue();
private AfterTransactionCompletionProcessQueue(SessionImplementor session) {
this.session = session;
}
public void addSpacesToInvalidate(String[] spaces) {
for ( String space : spaces ) {
addSpaceToInvalidate( space );
}
}
public void addSpaceToInvalidate(String space) {
querySpacesToInvalidate.add( space );
}
public void register(AfterTransactionCompletionProcess process) {
if ( process == null ) {
return;
}
processes.add( process );
}
public void afterTransactionCompletion(boolean success) {
for ( AfterTransactionCompletionProcess process : processes ) {
try {
process.doAfterTransactionCompletion( success, session );
}
catch ( CacheException ce ) {
LOG.unableToReleaseCacheLock( ce );
// continue loop
}
catch ( Exception e ) {
throw new AssertionFailure( "Exception releasing cache locks", e );
}
}
processes.clear();
if ( session.getFactory().getSettings().isQueryCacheEnabled() ) {
session.getFactory().getUpdateTimestampsCache().invalidate(
querySpacesToInvalidate.toArray( new String[ querySpacesToInvalidate.size()] )
);
}
querySpacesToInvalidate.clear();
}
}
/**
* Sorts the insert actions using more hashes.
*
* @author Jay Erb
*/
private class InsertActionSorter {
// the mapping of entity names to their latest batch numbers.
private HashMap latestBatches = new HashMap();
private HashMap entityBatchNumber;
// the map of batch numbers to EntityInsertAction lists
private HashMap> actionBatches = new HashMap>();
public InsertActionSorter() {
//optimize the hash size to eliminate a rehash.
entityBatchNumber = new HashMap( insertions.size() + 1, 1.0f );
}
/**
* Sort the insert actions.
*/
@SuppressWarnings({ "unchecked", "UnnecessaryBoxing" })
public void sort() {
// the list of entity names that indicate the batch number
for ( EntityInsertAction action : (List) insertions ) {
// remove the current element from insertions. It will be added back later.
String entityName = action.getEntityName();
// the entity associated with the current action.
Object currentEntity = action.getInstance();
Integer batchNumber;
if ( latestBatches.containsKey( entityName ) ) {
// There is already an existing batch for this type of entity.
// Check to see if the latest batch is acceptable.
batchNumber = findBatchNumber( action, entityName );
}
else {
// add an entry for this type of entity.
// we can be assured that all referenced entities have already
// been processed,
// so specify that this entity is with the latest batch.
// doing the batch number before adding the name to the list is
// a faster way to get an accurate number.
batchNumber = actionBatches.size();
latestBatches.put( entityName, batchNumber );
}
entityBatchNumber.put( currentEntity, batchNumber );
addToBatch( batchNumber, action );
}
insertions.clear();
// now rebuild the insertions list. There is a batch for each entry in the name list.
for ( int i = 0; i < actionBatches.size(); i++ ) {
List batch = actionBatches.get( i );
for ( EntityInsertAction action : batch ) {
insertions.add( action );
}
}
}
/**
* Finds an acceptable batch for this entity to be a member as part of the {@link InsertActionSorter}
*
* @param action The action being sorted
* @param entityName The name of the entity affected by the action
*
* @return An appropriate batch number; todo document this process better
*/
@SuppressWarnings({ "UnnecessaryBoxing", "unchecked" })
private Integer findBatchNumber(
EntityInsertAction action,
String entityName) {
// loop through all the associated entities and make sure they have been
// processed before the latest
// batch associated with this entity type.
// the current batch number is the latest batch for this entity type.
Integer latestBatchNumberForType = latestBatches.get( entityName );
// loop through all the associations of the current entity and make sure that they are processed
// before the current batch number
Object[] propertyValues = action.getState();
Type[] propertyTypes = action.getPersister().getClassMetadata()
.getPropertyTypes();
for ( int i = 0; i < propertyValues.length; i++ ) {
Object value = propertyValues[i];
Type type = propertyTypes[i];
if ( type.isEntityType() && value != null ) {
// find the batch number associated with the current association, if any.
Integer associationBatchNumber = entityBatchNumber.get( value );
if ( associationBatchNumber != null && associationBatchNumber.compareTo( latestBatchNumberForType ) > 0 ) {
// create a new batch for this type. The batch number is the number of current batches.
latestBatchNumberForType = actionBatches.size();
latestBatches.put( entityName, latestBatchNumberForType );
// since this entity will now be processed in the latest possible batch,
// we can be assured that it will come after all other associations,
// there's not need to continue checking.
break;
}
}
}
return latestBatchNumberForType;
}
@SuppressWarnings({ "unchecked" })
private void addToBatch(Integer batchNumber, EntityInsertAction action) {
List actions = actionBatches.get( batchNumber );
if ( actions == null ) {
actions = new LinkedList();
actionBatches.put( batchNumber, actions );
}
actions.add( action );
}
}
}
