/**
* Method to load all unloaded fields in the FetchPlan. Recurses through the FetchPlan objects and
* loads fields of sub-objects where needed. Used as a precursor to detaching objects at commit
* since fields can't be loaded during the postCommit phase when the detach actually happens.
*
* @param state The FetchPlan state
*/
public void loadFieldsInFetchPlan(FetchPlanState state) {
if ((flags & FLAG_LOADINGFPFIELDS) != 0) {
// Already in the process of loading fields in this class so skip
return;
}
flags |= FLAG_LOADINGFPFIELDS;
try {
// Load unloaded FetchPlan fields of this object
loadUnloadedFieldsInFetchPlan();
// Recurse through all fields and do the same
int[] fieldNumbers =
ClassUtils.getFlagsSetTo(loadedFields, cmd.getAllMemberPositions(), true);
if (fieldNumbers != null && fieldNumbers.length > 0) {
// TODO Fix this to just access the fields of the FieldManager yet this actually does a
// replaceField
replaceFields(
fieldNumbers, new LoadFieldManager(this, cmd.getSCOMutableMemberFlags(), myFP, state));
updateLevel2CacheForFields(fieldNumbers);
}
} finally {
flags &= ~FLAG_LOADINGFPFIELDS;
}
}
/**
* Method that will unload all fields that are not in the FetchPlan. This is typically for use
* when the instance is being refreshed.
*/
public void unloadNonFetchPlanFields() {
int[] fpFieldNumbers = myFP.getMemberNumbers();
int[] nonfpFieldNumbers = null;
if (fpFieldNumbers == null || fpFieldNumbers.length == 0) {
nonfpFieldNumbers = cmd.getAllMemberPositions();
} else {
int fieldCount = cmd.getMemberCount();
if (fieldCount == fpFieldNumbers.length) {
// No fields that arent in FetchPlan
return;
}
nonfpFieldNumbers = new int[fieldCount - fpFieldNumbers.length];
int currentFPFieldIndex = 0;
int j = 0;
for (int i = 0; i < fieldCount; i++) {
if (currentFPFieldIndex >= fpFieldNumbers.length) {
// Past end of FetchPlan fields
nonfpFieldNumbers[j++] = i;
} else {
if (fpFieldNumbers[currentFPFieldIndex] == i) {
// FetchPlan field so move to next
currentFPFieldIndex++;
} else {
nonfpFieldNumbers[j++] = i;
}
}
}
}
// Mark all non-FetchPlan fields as unloaded
for (int i = 0; i < nonfpFieldNumbers.length; i++) {
loadedFields[nonfpFieldNumbers[i]] = false;
}
}
/**
* Convenience accessor to return the field numbers for the input loaded and dirty field arrays.
*
* @param loadedFields Fields that were detached with the object
* @param dirtyFields Fields that have been modified while detached
* @return The field numbers of loaded or dirty fields
*/
protected int[] getFieldNumbersOfLoadedOrDirtyFields(
boolean[] loadedFields, boolean[] dirtyFields) {
// Find the number of fields that are loaded or dirty
int numFields = 0;
for (int i = 0; i < loadedFields.length; i++) {
if (loadedFields[i] || dirtyFields[i]) {
numFields++;
}
}
int[] fieldNumbers = new int[numFields];
int n = 0;
int[] allFieldNumbers = cmd.getAllMemberPositions();
for (int i = 0; i < loadedFields.length; i++) {
if (loadedFields[i] || dirtyFields[i]) {
fieldNumbers[n++] = allFieldNumbers[i];
}
}
return fieldNumbers;
}
/* (non-Javadoc)
* @see org.datanucleus.store.fieldmanager.AbstractFieldManager#fetchObjectField(int)
*/
@Override
public Object fetchObjectField(int fieldNumber) {
ClassLoaderResolver clr = ec.getClassLoaderResolver();
AbstractMemberMetaData mmd = cmd.getMetaDataForManagedMemberAtAbsolutePosition(fieldNumber);
RelationType relationType = mmd.getRelationType(clr);
EmbeddedMetaData embmd = mmds.get(0).getEmbeddedMetaData();
if (mmds.size() == 1
&& embmd != null
&& embmd.getOwnerMember() != null
&& embmd.getOwnerMember().equals(mmd.getName())) {
// Special case of this being a link back to the owner. TODO Repeat this for nested and their
// owners
ObjectProvider[] ownerOps = ec.getOwnersForEmbeddedObjectProvider(op);
return (ownerOps != null && ownerOps.length > 0 ? ownerOps[0].getObject() : null);
}
if (relationType != RelationType.NONE
&& MetaDataUtils.getInstance()
.isMemberEmbedded(ec.getMetaDataManager(), clr, mmd, relationType, null)) {
// Embedded field
if (RelationType.isRelationSingleValued(relationType)) {
// TODO Cater for null value detection
List<AbstractMemberMetaData> embMmds = new ArrayList<AbstractMemberMetaData>(mmds);
embMmds.add(mmd);
AbstractClassMetaData embCmd =
ec.getMetaDataManager().getMetaDataForClass(mmd.getType(), clr);
ObjectProvider embOP =
ec.getNucleusContext()
.getObjectProviderFactory()
.newForEmbedded(ec, embCmd, op, fieldNumber);
FieldManager ffm = new FetchEmbeddedFieldManager(embOP, result, embMmds, table);
embOP.replaceFields(embCmd.getAllMemberPositions(), ffm);
return embOP.getObject();
}
}
return fetchNonEmbeddedObjectField(mmd, relationType, clr);
}
private static void addColumnsToScanForEmbeddedMember(
Scan scan, List<AbstractMemberMetaData> embMmds, Table table, ExecutionContext ec) {
AbstractMemberMetaData lastMmd = embMmds.get(embMmds.size() - 1);
ClassLoaderResolver clr = ec.getClassLoaderResolver();
AbstractClassMetaData embCmd =
ec.getMetaDataManager().getMetaDataForClass(lastMmd.getTypeName(), clr);
int[] embMmdPosns = embCmd.getAllMemberPositions();
for (int i = 0; i < embMmdPosns.length; i++) {
AbstractMemberMetaData embMmd = embCmd.getMetaDataForManagedMemberAtAbsolutePosition(i);
List<AbstractMemberMetaData> subEmbMmds = new ArrayList<AbstractMemberMetaData>(embMmds);
subEmbMmds.add(embMmd);
RelationType relationType = embMmd.getRelationType(clr);
MemberColumnMapping mapping = table.getMemberColumnMappingForEmbeddedMember(subEmbMmds);
if (RelationType.isRelationSingleValued(relationType)) {
addColumnsToScanForEmbeddedMember(scan, subEmbMmds, table, ec);
} else {
String familyName = HBaseUtils.getFamilyNameForColumn(mapping.getColumn(0));
String qualifName = HBaseUtils.getQualifierNameForColumn(mapping.getColumn(0));
scan.addColumn(familyName.getBytes(), qualifName.getBytes());
}
}
}
