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/*
* Copyright (c) 1998, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Oracle - initial API and implementation from Oracle TopLink
package org.eclipse.persistence.internal.sessions;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Vector;
import org.eclipse.persistence.descriptors.ClassDescriptor;
import org.eclipse.persistence.descriptors.FetchGroupManager;
import org.eclipse.persistence.descriptors.TimestampLockingPolicy;
import org.eclipse.persistence.descriptors.VersionLockingPolicy;
import org.eclipse.persistence.internal.descriptors.OptimisticLockingPolicy;
import org.eclipse.persistence.internal.helper.ClassConstants;
import org.eclipse.persistence.internal.identitymaps.CacheId;
import org.eclipse.persistence.internal.identitymaps.CacheKey;
import org.eclipse.persistence.logging.SessionLog;
import org.eclipse.persistence.mappings.DatabaseMapping;
import org.eclipse.persistence.mappings.foundation.AbstractDirectMapping;
import org.eclipse.persistence.queries.FetchGroup;
import org.eclipse.persistence.queries.ReadObjectQuery;
/**
*
* Purpose: Hold the Records of change for a particular instance of an object.
*
* Description: This class uses the Primary Keys of the Object it represents,
* and the class.
*
*/
public class ObjectChangeSet implements Serializable, Comparable, org.eclipse.persistence.sessions.changesets.ObjectChangeSet {
/** Allow change sets to be compared by changes for batching. */
public static class ObjectChangeSetComparator implements Comparator, Serializable {
private static final long serialVersionUID = -7902750710186726851L;
/**
* Determine if the receiver is greater or less than the change set.
*/
@Override
public int compare(Object object1, Object object2) {
if (object1 == object2) {
return 0;
}
ObjectChangeSet left = (ObjectChangeSet)object1;
ObjectChangeSet right = (ObjectChangeSet)object2;
// Sort by changes to keep same SQL together for batching.
if ((left.changes != null) && right.changes != null) {
int size = left.changes.size();
List otherChanges = right.changes;
int otherSize = otherChanges.size();
if (size > otherSize) {
return 1;
} else if (size < otherSize) {
return -1;
}
for (int index = 0; index < size; index++) {
ChangeRecord record = (ChangeRecord)left.changes.get(index);
ChangeRecord otherRecord = (ChangeRecord)otherChanges.get(index);
int compare = record.getAttribute().compareTo(otherRecord.getAttribute());
if (compare != 0) {
return compare;
}
}
}
return left.compareTo(right);
}
}
/** This is the collection of changes */
protected List changes;
protected transient Map attributesToChanges;
protected boolean shouldBeDeleted;
protected Object id;
protected transient Class classType;
protected String className;
protected boolean isNew;
protected boolean isAggregate;
protected Object oldKey;
protected Object newKey;
protected AbstractRecord protectedForeignKeys;
/** This member variable holds the reference to the parent UnitOfWork Change Set **/
protected transient UnitOfWorkChangeSet unitOfWorkChangeSet;
/** Used in mergeObjectChanges method for writeLock and initialWriteLock comparison of the merged change sets **/
protected transient OptimisticLockingPolicy optimisticLockingPolicy;
protected Object initialWriteLockValue;
protected Object writeLockValue;
/** Invalid change set shouldn't be merged into object in cache, rather the object should be invalidated **/
protected boolean isInvalid;
protected transient Object cloneObject;
protected boolean hasVersionChange;
/** Contains optimisticReadLockObject corresponding to the clone, non-null indicates forced changes **/
protected Boolean shouldModifyVersionField;
/** For CMP only: indicates that the object should be force updated (whether it has OptimisticLocking or not): getCmpPolicy().getForcedUpdate()==true**/
protected transient boolean hasCmpPolicyForcedUpdate;
protected transient boolean hasChangesFromCascadeLocking;
/**
* This is used during attribute level change tracking when a particular
* change was detected but that change can not be tracked (ie customer set
* entire collection in object).
*/
protected transient Set deferredSet;
/**
* Used to store the type of cache synchronization used for this object
* This variable is set just before the change set is serialized.
*/
protected int cacheSynchronizationType;
/** PERF: Cache the session cacheKey during the merge to avoid duplicate lookups. */
protected transient CacheKey activeCacheKey;
/** Cache the descriptor as it is useful and required in some places. */
protected transient ClassDescriptor descriptor;
/** return whether this change set should be recalculated after an event changes the object */
protected transient boolean shouldRecalculateAfterUpdateEvent = true;
//This controls how long the thread can wait for other thread to put Entity instance in cache
//This is not final to allow a way for the value to be changed without supporting API
public static final int MAX_TRIES = 18000;
/**
* The default constructor.
*/
public ObjectChangeSet() { }
/**
* This constructor is used to create an ObjectChangeSet that represents a regular object.
*/
public ObjectChangeSet(Object primaryKey, ClassDescriptor descriptor, Object cloneObject, UnitOfWorkChangeSet parent, boolean isNew) {
this.cacheSynchronizationType = ClassDescriptor.UNDEFINED_OBJECT_CHANGE_BEHAVIOR;
this.cloneObject = cloneObject;
this.isNew = isNew;
this.shouldBeDeleted = false;
this.id = primaryKey;
this.classType = descriptor.getJavaClass();
this.className = this.classType.getName();
this.descriptor = descriptor;
this.cacheSynchronizationType = descriptor.getCachePolicy().getCacheSynchronizationType();
this.unitOfWorkChangeSet = parent;
this.isAggregate = false;
}
public ClassDescriptor getDescriptor() {
return descriptor;
}
public void setDescriptor(ClassDescriptor descriptor) {
this.descriptor = descriptor;
}
/**
* INTERNAL:
* This method will clear the changerecords from a changeSet
*/
public void clear(boolean clearKeys) {
this.shouldBeDeleted = false;
this.changes = null;
this.attributesToChanges = null;
this.deferredSet = null;
if (clearKeys){
this.setOldKey(null);
this.setNewKey(null);
}
}
/**
* Add the attribute change record.
*/
public void addChange(ChangeRecord changeRecord) {
if (changeRecord == null) {
return;
}
String attributeName = changeRecord.getAttribute();
Map attributeToChanges = getAttributesToChanges();
List changes = getChanges();
ChangeRecord existingChangeRecord = (ChangeRecord)attributeToChanges.get(attributeName);
// change tracking may add a change to an existing attribute fix that here.
if (existingChangeRecord != null) {
changes.remove(existingChangeRecord);
}
changes.add(changeRecord);
attributeToChanges.put(attributeName, changeRecord);
dirtyUOWChangeSet();
// now let's do some house keeping.
DatabaseMapping mapping = changeRecord.getMapping();
OptimisticLockingPolicy olp = getDescriptor().getOptimisticLockingPolicy();
if (olp != null){
if ((olp.shouldUpdateVersionOnOwnedMappingChange() && mapping.isOwned()) || (olp.shouldUpdateVersionOnMappingChange())){
this.shouldModifyVersionField = true; // must update version field when owned mapping changes
}
}
}
/**
* INTERNAL:
* This method is used during attribute level change tracking when a particular
* change was detected but that change can not be tracked (ie customer set
* entire collection in object). In this case flag this attribute for
* deferred change detection at commit time.
*/
public void deferredDetectionRequiredOn(String attributeName){
getDeferredSet().add(attributeName);
}
/**
* INTERNAL:
* Convenience method used to query this change set after it has been sent by
* cache synchronization.
* @return true if this change set should contain all change information, false if only
* the identity information should be available.
*/
public boolean containsChangesFromSynchronization() {
return ((cacheSynchronizationType == ClassDescriptor.SEND_NEW_OBJECTS_WITH_CHANGES) || (cacheSynchronizationType == ClassDescriptor.SEND_OBJECT_CHANGES));
}
/**
* Ensure change sets with the same primary key are equal.
*/
@Override
public boolean equals(Object object) {
if (object instanceof ObjectChangeSet) {
return equals((ObjectChangeSet)object);
}
return false;
}
/**
* Ensure change sets with the same primary key are equal.
*/
public boolean equals(ObjectChangeSet objectChange) {
if (this == objectChange) {
return true;
} else if (this.id == null) {
//new objects are compared based on identity
return false;
}
return (this.id.equals(objectChange.id));
}
/**
* Determine if the receiver is greater or less than the change set.
*/
@Override
public int compareTo(ObjectChangeSet changeSet) {
if (this == changeSet) {
return 0;
}
if (this.id == null) {
if (changeSet.id != null) {
return -1;
} else {
return 0;
}
} else if (changeSet.id == null) {
return 1;
}
try {
return ((Comparable)this.id).compareTo(changeSet.id);
} catch (Exception exception) {
return 0;
}
}
/**
* INTERNAL:
* stores the change records indexed by the attribute names
*/
public Map getAttributesToChanges() {
if (this.attributesToChanges == null) {
this.attributesToChanges = new HashMap();
}
return this.attributesToChanges;
}
/**
* INTERNAL:
* returns the change record for the specified attribute name
*/
@Override
public org.eclipse.persistence.sessions.changesets.ChangeRecord getChangesForAttributeNamed(String attributeName) {
return (ChangeRecord)this.getAttributesToChanges().get(attributeName);
}
/**
* ADVANCED:
* This method will return a collection of the attributes changed in the object.
*/
@Override
public List getChangedAttributeNames() {
List names = new ArrayList();
for (org.eclipse.persistence.sessions.changesets.ChangeRecord changeRecord : getChanges()) {
names.add(changeRecord.getAttribute());
}
return names;
}
/**
* INTERNAL:
* This method returns a reference to the collection of changes within this changeSet.
*/
@Override
public List getChanges() {
if (this.changes == null) {
this.changes = new ArrayList();
}
return changes;
}
/**
* INTERNAL:
* This method returns the class type that this changeSet represents.
* The class type must be initialized, before this method is called.
* @return java.lang.Class or null if the class type isn't initialized.
*/
public Class getClassType() {
return classType;
}
/**
* ADVANCE:
* This method returns the class type that this changeSet Represents.
* This requires the session to reload the class on serialization.
*/
@Override
public Class getClassType(org.eclipse.persistence.sessions.Session session) {
if (classType == null) {
classType = (Class)((AbstractSession)session).getDatasourcePlatform().getConversionManager().convertObject(getClassName(), ClassConstants.CLASS);
}
return classType;
}
/**
* ADVANCE:
* This method returns the class type that this changeSet Represents.
* The class type should be used if the class is desired.
*/
@Override
public String getClassName() {
return className;
}
/**
* INTERNAL:
* This method is used to return the initial lock value of the object this changeSet represents.
*/
public Object getInitialWriteLockValue() {
return initialWriteLockValue;
}
/**
* This method returns the key value that this object was stored under in it's
* Respective hashmap.
*/
@Override
public Object getOldKey() {
return this.oldKey;
}
/**
* This method returns the key value that this object will be stored under in it's
* Respective hashmap.
*/
@Override
public Object getNewKey() {
return this.newKey;
}
/**
* ADVANCED:
* This method returns the primary keys for the object that this change set represents.
*/
@Override
@Deprecated
public Vector getPrimaryKeys() {
if (this.id instanceof CacheId) {
return new Vector(Arrays.asList(((CacheId)this.id).getPrimaryKey()));
}
Vector primaryKey = new Vector(1);
primaryKey.add(this.id);
return primaryKey;
}
/**
* ADVANCED:
* This method returns the primary key for the object that this change set represents.
*/
@Override
public Object getId() {
return this.id;
}
public Object getOldValue() {
AbstractSession session = null;
if(this.unitOfWorkChangeSet != null) {
session = this.unitOfWorkChangeSet.getSession();
}
return getOldValue(session);
}
public Object getOldValue(AbstractSession session) {
if (this.isNew) {
return null;
}
if (this.changes == null || this.changes.isEmpty()) {
// object has not changed
return this.cloneObject;
} else {
if(this.cloneObject != null && session != null) {
Object oldValue = this.descriptor.getObjectBuilder().buildNewInstance();
FetchGroup fetchGroup = null;
FetchGroupManager fetchGroupManager = this.descriptor.getFetchGroupManager();
if(fetchGroupManager != null) {
fetchGroup = fetchGroupManager.getObjectFetchGroup(this.cloneObject);
}
for(DatabaseMapping mapping : this.descriptor.getMappings()) {
String attributeName = mapping.getAttributeName();
if(fetchGroup == null || fetchGroup.containsAttributeInternal(attributeName)) {
ChangeRecord changeRecord = (ChangeRecord)getChangesForAttributeNamed(attributeName);
if(changeRecord != null) {
mapping.setRealAttributeValueInObject(oldValue, changeRecord.getOldValue());
} else {
mapping.setAttributeValueInObject(oldValue, mapping.getAttributeValueFromObject(this.cloneObject));
}
}
}
return oldValue;
}
}
return null;
}
public int getSynchronizationType() {
return cacheSynchronizationType;
}
/**
* INTERNAL:
* This method is used to return the complex object specified within the change record.
* The object is collected from the session which, in this case, is the unit of work.
* The object's changed attributes will be merged and added to the identity map.
*/
public Object getTargetVersionOfSourceObject(MergeManager mergeManager, AbstractSession session) {
return getTargetVersionOfSourceObject(mergeManager, session, false);
}
/**
* INTERNAL:
* This method is used to return the complex object specified within the change record.
* The object is collected from the session which, in this case, is the unit of work.
* The object's changed attributes will be merged and added to the identity map
* @param shouldRead boolean if the object can not be found should it be read in from the database.
*/
public Object getTargetVersionOfSourceObject(MergeManager mergeManager, AbstractSession targetSession, boolean shouldRead) {
Object attributeValue = null;
ClassDescriptor descriptor = getDescriptor();
if (descriptor == null) {
descriptor = targetSession.getDescriptor(getClassType(targetSession));
}
if (descriptor != null) {
if (mergeManager.getSession().isUnitOfWork()) {
// The unit of works will have a copy or a new instance must be made
if (((UnitOfWorkImpl)mergeManager.getSession()).getLifecycle() == UnitOfWorkImpl.MergePending) {
// We are merging the unit of work into the original.
attributeValue = getObjectForMerge(mergeManager, targetSession, getId(), descriptor);
if (attributeValue == null){
// Bug 502085
UnitOfWorkImpl uow = (UnitOfWorkImpl)mergeManager.getSession();
if (this.isNew()) {
attributeValue = uow.getOriginalVersionOfObject(getUnitOfWorkClone());
} else {
attributeValue = uow.getOriginalVersionOfObjectOrNull(getUnitOfWorkClone(), this, descriptor, targetSession);
}
}
} else {
// We are merging something else within the unit of work.
// this is most likely because we are updating a backup clone and can retrieve
// the working clone as the result.
attributeValue = getUnitOfWorkClone();
}
} else {
// It is not a unitOfWork so we must be merging into a distributed cache.
attributeValue = getObjectForMerge(mergeManager, targetSession, getId(), descriptor);
}
if ((attributeValue == null) && (shouldRead)) {
// If the cache does not have a copy and I should read it from the database
// Then load the object if possible
ReadObjectQuery query = new ReadObjectQuery();
query.setShouldUseWrapperPolicy(false);
query.setReferenceClass(getClassType(targetSession));
query.setSelectionId(getId());
attributeValue = targetSession.executeQuery(query);
}
}
return attributeValue;
}
/**
* INTERNAL:
* For use within the distributed merge process, this method will get an object from the shared
* cache using a readlock. If a readlock is unavailable then the merge manager will be
* transitioned to deferred locks and a deferred lock will be used.
*/
protected Object getObjectForMerge(MergeManager mergeManager, AbstractSession session, Object primaryKey, ClassDescriptor descriptor) {
Object domainObject = null;
if (primaryKey == null) {
this.activeCacheKey = null;
return null;
}
CacheKey cacheKey = session.getIdentityMapAccessorInstance().getCacheKeyForObject(primaryKey, descriptor.getJavaClass(), descriptor, true);
if (cacheKey != null) {
if (cacheKey.acquireReadLockNoWait()) {
domainObject = cacheKey.getObject();
cacheKey.releaseReadLock();
} else {
if (!mergeManager.isTransitionedToDeferredLocks()) {
session.getIdentityMapAccessorInstance().getWriteLockManager().transitionToDeferredLocks(mergeManager);
}
cacheKey.acquireDeferredLock();
domainObject = cacheKey.getObject();
int tries = 0;
while (domainObject == null) {
++tries;
if (tries > MAX_TRIES){
session.getParent().log(SessionLog.SEVERE, SessionLog.CACHE, "entity_not_available_during_merge", new Object[]{descriptor.getJavaClassName(), cacheKey.getKey(), Thread.currentThread().getName(), cacheKey.getActiveThread()});
break;
}
synchronized (cacheKey) {
if (cacheKey.isAcquired()) {
try {
cacheKey.wait(10);
} catch (InterruptedException e) {
//ignore and return
}
}
domainObject = cacheKey.getObject();
}
}
cacheKey.releaseDeferredLock();
}
} else {
domainObject = mergeManager.registerExistingObjectOfReadOnlyClassInNestedTransaction(getUnitOfWorkClone(), descriptor, session);
// There is no need to get the cache key in this case because UOW is performing
// a nested UOW merge, and no locking occurs.
}
// Set activeCacheKey.
this.activeCacheKey = cacheKey;
return domainObject;
}
/**
* INTERNAL:
* Returns the UnitOfWork Clone that this ChangeSet was built for.
*/
public Object getUnitOfWorkClone() {
return this.cloneObject;
}
/**
* INTERNAL:
* Sets the UnitOfWork Clone that this ChangeSet was built for.
*/
public void setUnitOfWorkClone(Object cloneObject) {
this.cloneObject = cloneObject;
}
/**
* ADVANCED:
* This method is used to return the parent UnitOfWorkChangeSet.
*/
@Override
public org.eclipse.persistence.sessions.changesets.UnitOfWorkChangeSet getUOWChangeSet() {
return unitOfWorkChangeSet;
}
/**
* INTERNAL:
* This method is used to return the lock value of the object this changeSet represents.
*/
@Override
public Object getWriteLockValue() {
return writeLockValue;
}
/**
* ADVANCED:
* This method will return true if the specified attribute has been changed.
* @param attributeName the name of the attribute to search for.
*/
@Override
public boolean hasChangeFor(String attributeName) {
for (org.eclipse.persistence.sessions.changesets.ChangeRecord changeRecord : getChanges()) {
if (changeRecord.getAttribute().equals(attributeName)) {
return true;
}
}
return false;
}
/**
* ADVANCED:
* Returns true if this particular changeSet has changes.
*/
@Override
public boolean hasChanges() {
// a change set must also be considered dirty if only the version number has been updated
// and the version is not a mapped field. This is required to propagate the change
// set via cache sync. to avoid opt. lock exceptions on the remote servers.
return this.isNew || this.hasVersionChange || ((this.changes != null) && (!this.changes.isEmpty()));
}
/**
* INTERNAL:
* Returns true if this particular changeSet has forced SQL changes. This is true whenever
* CMPPolicy.getForceUpdate() == true or if the object has been marked for opt. read
* lock (uow.forceUpdateToVersionField). Kept separate from 'hasChanges' because we don't
* want to merge or cache sync. a change set that has no 'real' changes.
*/
public boolean hasForcedChanges() {
return this.shouldModifyVersionField != null || this.hasCmpPolicyForcedUpdate;
}
/**
* INTERNAL:
* Holds a Boolean indicating whether version field should be modified.
* This Boolean is set by forcedUpdate into uow.getOptimisticReadLockObjects()
* for the clone object and copied here (so don't need to search for it again
* in uow.getOptimisticReadLockObjects()).
*/
public void setShouldModifyVersionField(Boolean shouldModifyVersionField) {
this.shouldModifyVersionField = shouldModifyVersionField;
if(shouldModifyVersionField != null && shouldModifyVersionField.booleanValue()) {
// mark the version number as 'dirty'
// Note that at this point there is no newWriteLockValue - it will be set later.
// This flag is set to indicate that the change set WILL have changes.
this.hasVersionChange = true;
}
}
/**
* INTERNAL:
* Holds a Boolean indicating whether version field should be modified.
*/
public Boolean shouldModifyVersionField() {
return this.shouldModifyVersionField;
}
/**
* INTERNAL:
*/
public void setHasCmpPolicyForcedUpdate(boolean hasCmpPolicyForcedUpdate) {
this.hasCmpPolicyForcedUpdate = hasCmpPolicyForcedUpdate;
}
/**
* INTERNAL:
*/
public boolean hasCmpPolicyForcedUpdate() {
return this.hasCmpPolicyForcedUpdate;
}
/**
* INTERNAL:
* Returns true if this particular changeSet has forced SQL changes because
* of a cascade optimistic locking policy.
*/
public boolean hasForcedChangesFromCascadeLocking() {
return this.hasChangesFromCascadeLocking;
}
/**
* INTERNAL:
* Used by calculateChanges to mark this ObjectChangeSet as having to be
* flushed to the db stemming from a cascade optimistic locking policy.
*/
public void setHasForcedChangesFromCascadeLocking(boolean newValue) {
this.setShouldModifyVersionField(Boolean.TRUE);
this.hasChangesFromCascadeLocking = newValue;
}
/**
* This method overrides the hashcode method. If this set has a cacheKey then return the hashcode of the
* cache key, otherwise return the identity hashcode of this object.
*/
@Override
public int hashCode() {
if (getId() == null) {
//new objects are compared based on identity
return System.identityHashCode(this);
}
return getId().hashCode();
}
/**
* INTERNAL:
* Returns true if this particular changeSet has a Key.
*/
public boolean hasKeys() {
return (this.newKey != null) || (this.oldKey != null);
}
/**
* INTERNAL:
* Used to determine if the object change set represents an aggregate object.
*/
public boolean isAggregate() {
return isAggregate;
}
/**
* ADVANCED:
* Returns true if this ObjectChangeSet represents a new object.
*/
@Override
public boolean isNew() {
return isNew;
}
/**
* INTERNAL:
* Indicates whether the change set is invalid.
*/
public boolean isInvalid() {
return isInvalid;
}
/**
* INTERNAL:
* This method will be used to merge changes from a supplied ObjectChangeSet
* into this changeSet.
*/
public void mergeObjectChanges(ObjectChangeSet changeSetToMergeFrom, UnitOfWorkChangeSet mergeToChangeSet, UnitOfWorkChangeSet mergeFromChangeSet) {
if (this == changeSetToMergeFrom || this.isInvalid()) {
return;
}
if(changeSetToMergeFrom.optimisticLockingPolicy != null) {
// optimisticLockingPolicy != null guarantees initialWriteLockValue != null
if(this.optimisticLockingPolicy == null) {
this.optimisticLockingPolicy = changeSetToMergeFrom.optimisticLockingPolicy;
this.initialWriteLockValue = changeSetToMergeFrom.initialWriteLockValue;
this.writeLockValue = changeSetToMergeFrom.writeLockValue;
} else {
// optimisticLockingPolicy != null guarantees initialWriteLockValue != null
Object writeLockValueToCompare = this.writeLockValue;
if(writeLockValueToCompare == null) {
writeLockValueToCompare = this.initialWriteLockValue;
}
// In this merge initialWriteLockValue of this changeSet differs from
// writeLockValue of the changeSetToMergeFrom into which the merge was performed.
// Example:
// Original registered with version 1, the clone changed to version 2, uow.writeChanges is called:
// the corresponding "this" changeSet has initialWriteLockValue = 1 and writeLockValue = 2;
// custom update performed next changing the version of the object in the db to 3;
// the clone is refreshed in the uow - now it's version is 3;
// the cloned is changed to version 4, uow.commit is called:
// the corresponding changeSetToMergeFrom has initialWriteLockValue = 3 and writeLockValue = 4.
// This change set should be invalidated - the custom update would not be reflected after merge,
// therefore no merge into cache should be performed but rather the object in the cache should be invalidated.
if(this.optimisticLockingPolicy.compareWriteLockValues(writeLockValueToCompare, changeSetToMergeFrom.initialWriteLockValue) != 0) {
this.isInvalid = true;
return;
}
// Don't blindly overrite a write lock value with null. A
// consecutive change set may not have caused a version change,
// therefore the write lock value will be null in this case.
// E.g. Attribute change tracking does not discover a change
// across a relational mapping (unless a cascaded optimistic
// locking policy is used).
if (changeSetToMergeFrom.writeLockValue != null) {
this.writeLockValue = changeSetToMergeFrom.writeLockValue;
}
}
}
List changesToMerge = changeSetToMergeFrom.getChanges();
int size = changesToMerge.size();
for (int index = 0; index < size; ++index) {
ChangeRecord record = (ChangeRecord)changesToMerge.get(index);
ChangeRecord thisRecord = (ChangeRecord) getChangesForAttributeNamed(record.getAttribute());
if (thisRecord == null) {
record.updateReferences(mergeToChangeSet, mergeFromChangeSet);
record.setOwner(this);
this.addChange(record);
} else {
thisRecord.mergeRecord(record, mergeToChangeSet, mergeFromChangeSet);
}
}
this.shouldBeDeleted = changeSetToMergeFrom.shouldBeDeleted;
this.setOldKey(changeSetToMergeFrom.oldKey);
this.setNewKey(changeSetToMergeFrom.newKey);
this.hasVersionChange = changeSetToMergeFrom.hasVersionChange;
this.shouldModifyVersionField = changeSetToMergeFrom.shouldModifyVersionField;
this.hasCmpPolicyForcedUpdate = changeSetToMergeFrom.hasCmpPolicyForcedUpdate;
this.hasChangesFromCascadeLocking = changeSetToMergeFrom.hasChangesFromCascadeLocking;
this.deferredSet = changeSetToMergeFrom.deferredSet;
}
/**
* INTERNAL:
* Helper method used by readObject to read a completely serialized change set from
* the stream.
*/
public void readCompleteChangeSet(java.io.ObjectInputStream stream) throws java.io.IOException, ClassNotFoundException {
readIdentityInformation(stream);
// bug 3526981 - avoid side effects of setter methods by directly assigning variables
// still calling setOldKey to avoid duplicating the code in that method
this.changes = (List)stream.readObject();
this.oldKey = stream.readObject();
this.newKey = stream.readObject();
this.protectedForeignKeys = (AbstractRecord)stream.readObject();
}
/**
* INTERNAL:
* Helper method used by readObject to read just the information about object identity
* from a serialized stream.
*/
public void readIdentityInformation(java.io.ObjectInputStream stream) throws java.io.IOException, ClassNotFoundException {
// bug 3526981 - avoid side effects of setter methods by directly assigning variables
this.id = stream.readObject();
this.className = (String)stream.readObject();
this.writeLockValue = stream.readObject();
this.initialWriteLockValue = stream.readObject();
}
/**
* INTERNAL:
* Override the default serialization. Object Change Sets will be serialized differently
* depending on the type of cache synchronization they use.
*/
private void readObject(java.io.ObjectInputStream stream) throws java.io.IOException, ClassNotFoundException {
int cacheSyncType = stream.read();
this.cacheSynchronizationType = cacheSyncType;
// The boolean variables have been assembled into a byte.
// Extract them here
this.shouldBeDeleted = stream.readBoolean();
this.isInvalid = stream.readBoolean();
this.isNew = stream.readBoolean();
this.isAggregate = stream.readBoolean();
this.shouldModifyVersionField = (Boolean)stream.readObject();
this.hasVersionChange = stream.readBoolean();
// Only the identity information is sent with a number of cache synchronization types
// Here we decide what to read.
if (this.shouldBeDeleted || (cacheSyncType == ClassDescriptor.DO_NOT_SEND_CHANGES) || (cacheSyncType == ClassDescriptor.INVALIDATE_CHANGED_OBJECTS)) {
readIdentityInformation(stream);
} else {
readCompleteChangeSet(stream);
}
}
/**
* Set the id of the object for this change set.
*/
public void setId(Object id) {
this.id = id;
}
/**
* Set the changes.
*/
public void setChanges(List changesList) {
this.changes = changesList;
updateUOWChangeSet();
}
/**
* Set the class type.
*/
public void setClassType(Class newValue) {
this.classType = newValue;
}
/**
* INTERNAL:
* Set the class name. The name is used for serialization with cache coordination.
*/
public void setClassName(String newValue) {
this.className = newValue;
}
/**
* INTERNAL:
* Set if this object change Set represents an aggregate
* @param isAggregate boolean true if the ChangeSet represents an aggregate
*/
public void setIsAggregate(boolean isAggregate) {
this.isAggregate = isAggregate;
}
/**
* INTERNAL:
* Set whether this ObjectChanges represents a new Object
* @param newIsNew boolean true if this ChangeSet represents a new object
*/
public void setIsNew(boolean newIsNew) {
isNew = newIsNew;
}
/**
* This method is used to set the value that this object was stored under in its respected
* map collection
*/
public void setOldKey(Object key) {
//may be merging changeSets lets make sure that we can remove based on the
//old key when we finally merge.
if ((key == null) || (this.oldKey == null)) {
this.oldKey = key;
}
}
/**
* This method is used to set the value that this object will be stored under in its respected
* map collection
*/
public void setNewKey(Object key) {
this.newKey = key;
}
/**
* This method was created in VisualAge.
* @param newValue boolean
*/
public void setShouldBeDeleted(boolean newValue) {
this.shouldBeDeleted = newValue;
}
public void setSynchronizationType(int type) {
cacheSynchronizationType = type;
}
/**
* INTERNAL:
* Used to set the parent change Set.
*/
public void setUOWChangeSet(UnitOfWorkChangeSet newUnitOfWorkChangeSet) {
unitOfWorkChangeSet = newUnitOfWorkChangeSet;
}
/**
* INTERNAL:
* This method should ONLY be used to set the initial writeLock value for
* an ObjectChangeSet when it is first built.
*/
public void setOptimisticLockingPolicyAndInitialWriteLockValue(OptimisticLockingPolicy optimisticLockingPolicy, AbstractSession session) {
// ignore optimistic locking policy if it can't compare lock values (like FieldsLockingPolicy).
if(optimisticLockingPolicy.supportsWriteLockValuesComparison()) {
this.optimisticLockingPolicy = optimisticLockingPolicy;
this.initialWriteLockValue = optimisticLockingPolicy.getWriteLockValue(cloneObject, getId(), session);
}
}
/**
* ADVANCED:
* This method is used to set the writeLock value for an ObjectChangeSet
* Any changes to the write lock value
* should to through setWriteLockValue(Object obj) so that the change set is
* marked as being dirty.
*/
public void setWriteLockValue(java.lang.Object newWriteLockValue) {
this.writeLockValue = newWriteLockValue;
// mark the version number as 'dirty'
this.hasVersionChange = true;
updateUOWChangeSet();
}
/**
* ADVANCED:
* This method is used to set the initial writeLock value for an ObjectChangeSet.
* The initial value will only be set once, and can not be overwritten.
*/
public void setInitialWriteLockValue(Object initialWriteLockValue) {
if (this.initialWriteLockValue == null) {
this.initialWriteLockValue = initialWriteLockValue;
}
}
/**
* Mark change set for a deleted object.
*/
public boolean shouldBeDeleted() {
return shouldBeDeleted;
}
@Override
public String toString() {
return this.getClass().getSimpleName() + "(" + hashCode() + ", " + this.getClassName() + ")" + getChanges().toString();
}
/**
* INTERNAL:
* Used to update a changeRecord that is stored in the CHangeSet with a new value.
*/
public void updateChangeRecordForAttribute(String attributeName, Object value) {
ChangeRecord changeRecord = (ChangeRecord)getChangesForAttributeNamed(attributeName);
if (changeRecord != null) {
changeRecord.updateChangeRecordWithNewValue(value);
}
}
/**
* ADVANCED:
* Used to update a changeRecord that is stored in the CHangeSet with a new value.
* Used when the new value is a mapped object.
*/
public void updateChangeRecordForAttributeWithMappedObject(String attributeName, Object value, AbstractSession session) {
ObjectChangeSet referenceChangeSet = (ObjectChangeSet)this.getUOWChangeSet().getObjectChangeSetForClone(value);
if (referenceChangeSet == null) {
ClassDescriptor descriptor = session.getDescriptor(value.getClass());
if (descriptor != null) {
referenceChangeSet = descriptor.getObjectBuilder().createObjectChangeSet(value, (UnitOfWorkChangeSet)this.getUOWChangeSet(), false, session);
}
}
updateChangeRecordForAttribute(attributeName, referenceChangeSet);
}
/**
* INTERNAL:
* Used to update a changeRecord that is stored in the CHangeSet with a new value.
*/
public void updateChangeRecordForAttribute(DatabaseMapping mapping, Object value, AbstractSession session, Object oldValue) {
String attributeName = mapping.getAttributeName();
ChangeRecord changeRecord = (ChangeRecord)getChangesForAttributeNamed(attributeName);
// bug 2641228 always ensure that we convert the value to the correct type
if (mapping.isDirectToFieldMapping()) {
value = ((AbstractDirectMapping)mapping).getObjectValue(value, session);
}
if (changeRecord != null) {
changeRecord.updateChangeRecordWithNewValue(value);
} else if (mapping.isDirectToFieldMapping()) {
// If it is direct to field then this is most likely the result of a forced update and
// we will need to merge this object.
changeRecord = new DirectToFieldChangeRecord(this);
changeRecord.setAttribute(attributeName);
changeRecord.setMapping(mapping);
((DirectToFieldChangeRecord)changeRecord).setNewValue(value);
((DirectToFieldChangeRecord)changeRecord).setOldValue(oldValue);
this.addChange(changeRecord);
}
}
/**
* INTERNAL:
* This method will be used when merging changesets into other changesets.
* It will fix references within a changeSet so that it's records point to
* changesets within this UOWChangeSet.
*/
public void updateReferences(UnitOfWorkChangeSet localChangeSet, UnitOfWorkChangeSet mergingChangeSet) {
int size = getChanges().size();
for (int index = 0; index < size; ++index) {
ChangeRecord record = (ChangeRecord)getChanges().get(index);
record.updateReferences(localChangeSet, mergingChangeSet);
record.setOwner(this);
}
}
/**
* INTERNAL:
* Override the default serialization since different parts of an ObjectChangeSet will
* be serialized depending on the type of CacheSynchronizationType
*/
private void writeObject(java.io.ObjectOutputStream stream) throws java.io.IOException {
stream.write(this.cacheSynchronizationType);
stream.writeBoolean(this.shouldBeDeleted);
stream.writeBoolean(this.isInvalid);
stream.writeBoolean(this.isNew);
stream.writeBoolean(this.isAggregate);
stream.writeObject(this.shouldModifyVersionField);
stream.writeBoolean(this.hasVersionChange);
if (this.shouldBeDeleted || (this.cacheSynchronizationType == ClassDescriptor.DO_NOT_SEND_CHANGES) || (this.cacheSynchronizationType == ClassDescriptor.INVALIDATE_CHANGED_OBJECTS)) {
writeIdentityInformation(stream);
} else {
writeCompleteChangeSet(stream);
}
}
/**
* INTERNAL:
* Helper method to writeObject. Write only the information necessary to identify this
* ObjectChangeSet to the stream
*/
public void writeIdentityInformation(java.io.ObjectOutputStream stream) throws java.io.IOException {
stream.writeObject(this.id);
stream.writeObject(this.className);
stream.writeObject(this.writeLockValue);
stream.writeObject(this.initialWriteLockValue);
}
/**
* INTERNAL:
* Helper method to readObject. Completely write this ObjectChangeSet to the stream
*/
public void writeCompleteChangeSet(java.io.ObjectOutputStream stream) throws java.io.IOException {
writeIdentityInformation(stream);
stream.writeObject(this.changes);
stream.writeObject(this.oldKey);
stream.writeObject(this.newKey);
stream.writeObject(this.protectedForeignKeys);
}
/**
* INTERNAL:
* Reset the change set's transient variables after serialization.
*/
public void postSerialize(Object clone, UnitOfWorkChangeSet uowChangeSet, AbstractSession session) {
this.unitOfWorkChangeSet = uowChangeSet;
// Clone is null for recursive aggregate call, (clone will be set from root call,
// but descriptor and mapping needs to be set here.
if (clone != null) {
this.cloneObject = clone;
if (this.descriptor == null) {
this.descriptor = session.getDescriptor(clone);
this.classType = clone.getClass();
}
}
if ((this.attributesToChanges == null) && (this.changes != null)) {
for (ChangeRecord change : (List)(List)this.changes) {
getAttributesToChanges().put(change.getAttribute(), change);
}
}
// Aggregates should only be cascaded to, as they need the correct descriptor from the mapping.
if ((this.changes != null) && (this.descriptor != null) && ((clone == null) || !this.descriptor.isAggregateDescriptor())) {
for (ChangeRecord change : (List)(List)this.changes) {
DatabaseMapping mapping = this.descriptor.getObjectBuilder().getMappingForAttributeName(change.getAttribute());
change.setMapping(mapping);
if ((mapping != null) && mapping.isAggregateObjectMapping()) {
AggregateChangeRecord aggregate = (AggregateChangeRecord)change;
ObjectChangeSet aggregateCacheSet = (ObjectChangeSet)aggregate.getChangedObject();
if (aggregateCacheSet != null) {
aggregateCacheSet.setDescriptor(mapping.getReferenceDescriptor());
aggregateCacheSet.postSerialize(null, uowChangeSet, session);
}
}
}
}
}
/**
* This set contains the list of attributes that must be calculated at commit time.
*/
public Set getDeferredSet() {
if (deferredSet == null){
this.deferredSet = new HashSet();
}
return deferredSet;
}
/**
* Check to see if there are any attributes that must be calculated at commit time.
*/
public boolean hasDeferredAttributes() {
return ! (deferredSet == null || this.deferredSet.isEmpty());
}
protected void dirtyUOWChangeSet() {
// PERF: Set the unit of work change set to dirty avoid unnecessary message sends.
UnitOfWorkChangeSet unitOfWorkChangeSet = (UnitOfWorkChangeSet)getUOWChangeSet();
if (unitOfWorkChangeSet != null) {
unitOfWorkChangeSet.setHasChanges(true);
}
}
protected void updateUOWChangeSet() {
// needed to explicitly mark parent uow as having changes. This is needed in the
// case of Optimistic read locking and ForceUpdate. In these scenarios, the object
// change set can be modified to contain 'real' changes after the uow change set has
// computed its 'hasChanges' flag. If not done, the change set will not be merged.
if (getUOWChangeSet() != null) {
((org.eclipse.persistence.internal.sessions.UnitOfWorkChangeSet)this.getUOWChangeSet()).setHasChanges(this.hasChanges());
}
}
/**
* Rebuild writeLockValue to the expected type from user format i.e XML change set has all values as String.
*/
protected void rebuildWriteLockValueFromUserFormat(ClassDescriptor descriptor, AbstractSession session) {
if (descriptor.getOptimisticLockingPolicy() instanceof TimestampLockingPolicy) {
this.writeLockValue = session.getPlatform(descriptor.getJavaClass()).getConversionManager().convertObject(this.writeLockValue, ClassConstants.JavaSqlTimestamp_Class);
this.initialWriteLockValue = session.getPlatform(descriptor.getJavaClass()).getConversionManager().convertObject(this.initialWriteLockValue, ClassConstants.JavaSqlTimestamp_Class);
} else if (descriptor.getOptimisticLockingPolicy() instanceof VersionLockingPolicy) {
this.writeLockValue = session.getPlatform(descriptor.getJavaClass()).getConversionManager().convertObject(this.writeLockValue, ClassConstants.BIGDECIMAL);
this.initialWriteLockValue = session.getPlatform(descriptor.getJavaClass()).getConversionManager().convertObject(this.initialWriteLockValue, ClassConstants.BIGDECIMAL);
}
}
/**
* INTERNAL:
* Remove the change.
* Used by the event mechanism to reset changes after client has updated the object within an event.
*/
public void removeChange(String attributeName){
Object record = getChangesForAttributeNamed(attributeName);
if (record != null) {
getChanges().remove(record);
this.attributesToChanges.remove(attributeName);
}
}
/**
* Remove object represent this change set from identity map. If change set is in XML format, rebuild pk to the correct class type from String
*/
protected void removeFromIdentityMap(AbstractSession session) {
session.getIdentityMapAccessor().removeFromIdentityMap(getId(), getClassType(session));
}
/**
* INTERNAL:
* Indicates whether the object in session cache should be invalidated.
* @param original Object is from session's cache into which the changes are about to be merged, non null.
* @param session AbstractSession into which the changes are about to be merged;
*/
public boolean shouldInvalidateObject(Object original, AbstractSession session) {
// Either no optimistic locking or no version change.
if (optimisticLockingPolicy == null) {
return false;
}
if (session.isRemoteSession()){
//remote unit of work not supported as version values in UOW will be updated
//when the committed UOW is received on the client. That updated value will be
//set in the UOW cache when the changeset is calculated giving the changeset the
//incorrect initialWriteLockValue value
//version number comparison will still be completed later.
return false;
}
if(isInvalid()) {
return true;
}
Object originalWriteLockValue = optimisticLockingPolicy.getWriteLockValue(original, getId(), session);
// initialWriteLockValue and originalWriteLockValue are not equal.
// Example:
// original registered in uow with version 1 (originalWriteLockValue);
// uow.beginEarlyTransaction();
// custom update run through the uow changes the version on the object in the db to 2;
// the clone is refreshed - now it has version 2;
// on uow.commit or uow.writeChanges changeSet is created with initialWriteLockValue = 2;
// The original in the cache should be invalidated - the custom update would not be reflected after merge.
if (this.initialWriteLockValue == null){
if (this.hasChanges()){
return true; // no initial version was available but we will be merging changes with unknown version force invalidation
}else{
return false; // don't invalidate as we are not merging anything anyway
}
}
if (originalWriteLockValue != null && optimisticLockingPolicy.compareWriteLockValues(initialWriteLockValue, originalWriteLockValue) != 0) {
return true;
} else {
return false;
}
}
/**
* INTERNAL:
* PERF: Return the session cache-key, cached during the merge.
*/
public CacheKey getActiveCacheKey() {
return activeCacheKey;
}
/**
* INTERNAL:
* PERF: Set the session cache-key, cached during the merge.
*/
public void setActiveCacheKey(CacheKey activeCacheKey) {
this.activeCacheKey = activeCacheKey;
}
/**
* ADVANCED
* Returns true if this ObjectChangeSet should be recalculated after changes in event
* @return
*/
@Override
public boolean shouldRecalculateAfterUpdateEvent() {
return shouldRecalculateAfterUpdateEvent;
}
/**
* ADVANCED
* Set whether this ObjectChangeSet should be recalculated after changes in event
* @return
*/
@Override
public void setShouldRecalculateAfterUpdateEvent(boolean shouldRecalculateAfterUpdateEvent) {
this.shouldRecalculateAfterUpdateEvent = shouldRecalculateAfterUpdateEvent;
}
public boolean hasVersionChange() {
return hasVersionChange;
}
public void setHasVersionChange(boolean hasVersionChange) {
this.hasVersionChange = hasVersionChange;
}
public int getCacheSynchronizationType() {
return cacheSynchronizationType;
}
public void setCacheSynchronizationType(int cacheSynchronizationType) {
this.cacheSynchronizationType = cacheSynchronizationType;
}
public void setIsInvalid(boolean isInvalid) {
this.isInvalid = isInvalid;
}
public AbstractRecord getProtectedForeignKeys() {
return this.protectedForeignKeys;
}
public void setProtectedForeignKeys(AbstractRecord protectedForeignKeys) {
this.protectedForeignKeys = protectedForeignKeys;
}
public boolean hasProtectedForeignKeys() {
return (this.protectedForeignKeys != null) && (this.protectedForeignKeys.size() > 0);
}
}