/**
* Delete all historical information that is older than the provided CSN for this attribute type.
* Add the delete attribute state information
*
* @param csn time when the delete was done
*/
protected void delete(CSN csn) {
// iterate through the values in the valuesInfo and suppress all the values
// that have not been added after the date of this delete.
Iterator<AttrValueHistorical> it = valuesHist.keySet().iterator();
while (it.hasNext()) {
AttrValueHistorical info = it.next();
if (csn.isNewerThanOrEqualTo(info.getValueUpdateTime())
&& csn.isNewerThanOrEqualTo(info.getValueDeleteTime())) {
it.remove();
}
}
if (csn.isNewerThan(deleteTime)) {
deleteTime = csn;
}
if (csn.isNewerThan(lastUpdateTime)) {
lastUpdateTime = csn;
}
}
/**
* Process a add attribute values that is conflicting with a previous modification.
*
* @param csn the historical info associated to the entry
* @param m the modification that is being processed
* @param modsIterator iterator on the list of modification
* @return false if operation becomes empty and must not be processed
*/
private boolean conflictAdd(CSN csn, Modification m, Iterator<Modification> modsIterator) {
/*
* if historicalattributedelete is newer forget this mod else find
* attr value if does not exist add historicalvalueadded timestamp
* add real value in entry else if timestamp older and already was
* historicalvalueadded update historicalvalueadded else if
* timestamp older and was historicalvaluedeleted change
* historicalvaluedeleted into historicalvalueadded add value in
* real entry
*/
if (csn.isOlderThan(getDeleteTime())) {
/* A delete has been done more recently than this add
* forget this MOD ADD
*/
modsIterator.remove();
return false;
}
AttributeBuilder builder = new AttributeBuilder(m.getAttribute());
for (ByteString addVal : m.getAttribute()) {
AttrValueHistorical valInfo = new AttrValueHistorical(addVal, csn, null);
AttrValueHistorical oldValInfo = valuesHist.get(valInfo);
if (oldValInfo == null) {
/* this value does not exist yet
* add it in the historical information
* let the operation process normally
*/
valuesHist.put(valInfo, valInfo);
} else {
if (oldValInfo.isUpdate()) {
/* if the value is already present
* check if the updateTime must be updated
* in all cases suppress this value from the value list
* as it is already present in the entry
*/
if (csn.isNewerThan(oldValInfo.getValueUpdateTime())) {
valuesHist.remove(oldValInfo);
valuesHist.put(valInfo, valInfo);
}
builder.remove(addVal);
} else { // it is a delete
/* this value is marked as a deleted value
* check if this mod is more recent the this delete
*/
if (csn.isNewerThanOrEqualTo(oldValInfo.getValueDeleteTime())) {
/* this add is more recent,
* remove the old delete historical information
* and add our more recent one
* let the operation process
*/
valuesHist.remove(oldValInfo);
valuesHist.put(valInfo, valInfo);
} else {
/* the delete that is present in the historical information
* is more recent so it must win,
* remove this value from the list of values to add
* don't update the historical information
*/
builder.remove(addVal);
}
}
}
}
Attribute attr = builder.toAttribute();
m.setAttribute(attr);
if (attr.isEmpty()) {
modsIterator.remove();
}
if (csn.isNewerThan(getLastUpdateTime())) {
lastUpdateTime = csn;
}
return true;
}
/**
* Process a delete attribute values that is conflicting with a previous modification.
*
* @param csn The CSN of the currently processed change
* @param m the modification that is being processed
* @param modifiedEntry the entry that is modified (before current mod)
* @return false if there is nothing to do
*/
private boolean conflictDelete(CSN csn, Modification m, Entry modifiedEntry) {
/*
* We are processing a conflicting DELETE modification
*
* This code is written on the assumption that conflict are
* rare. We therefore don't care much about the performance
* However since it is rarely executed this code needs to be
* as simple as possible to make sure that all paths are tested.
* In this case the most simple seem to change the DELETE
* in a REPLACE modification that keeps all values
* more recent that the DELETE.
* we are therefore going to change m into a REPLACE that will keep
* all the values that have been updated after the DELETE time
* If a value is present in the entry without any state information
* it must be removed so we simply ignore them
*/
Attribute modAttr = m.getAttribute();
if (modAttr.isEmpty()) {
/*
* We are processing a DELETE attribute modification
*/
m.setModificationType(ModificationType.REPLACE);
AttributeBuilder builder = new AttributeBuilder(modAttr, true);
Iterator<AttrValueHistorical> it = valuesHist.keySet().iterator();
while (it.hasNext()) {
AttrValueHistorical valInfo = it.next();
if (csn.isOlderThan(valInfo.getValueUpdateTime())) {
/*
* this value has been updated after this delete, therefore
* this value must be kept
*/
builder.add(valInfo.getAttributeValue());
} else {
/*
* this value is going to be deleted, remove it from historical
* information unless it is a Deleted attribute value that is
* more recent than this DELETE
*/
if (csn.isNewerThanOrEqualTo(valInfo.getValueDeleteTime())) {
it.remove();
}
}
}
m.setAttribute(builder.toAttribute());
if (csn.isNewerThan(getDeleteTime())) {
deleteTime = csn;
}
if (csn.isNewerThan(getLastUpdateTime())) {
lastUpdateTime = csn;
}
} else {
// we are processing DELETE of some attribute values
AttributeBuilder builder = new AttributeBuilder(modAttr);
for (ByteString val : modAttr) {
boolean deleteIt = true; // true if the delete must be done
boolean addedInCurrentOp = false;
/* update historical information */
AttrValueHistorical valInfo = new AttrValueHistorical(val, null, csn);
AttrValueHistorical oldValInfo = valuesHist.get(valInfo);
if (oldValInfo != null) {
/* this value already exist in the historical information */
if (csn.equals(oldValInfo.getValueUpdateTime())) {
// This value was added earlier in the same operation
// we need to keep the delete.
addedInCurrentOp = true;
}
if (csn.isNewerThanOrEqualTo(oldValInfo.getValueDeleteTime())
&& csn.isNewerThanOrEqualTo(oldValInfo.getValueUpdateTime())) {
valuesHist.remove(oldValInfo);
valuesHist.put(valInfo, valInfo);
} else if (oldValInfo.isUpdate()) {
deleteIt = false;
}
} else {
valuesHist.remove(oldValInfo);
valuesHist.put(valInfo, valInfo);
}
/* if the attribute value is not to be deleted
* or if attribute value is not present suppress it from the
* MOD to make sure the delete is going to succeed
*/
if (!deleteIt
|| (!modifiedEntry.hasValue(modAttr.getAttributeType(), modAttr.getOptions(), val)
&& !addedInCurrentOp)) {
// this value was already deleted before and therefore
// this should not be replayed.
builder.remove(val);
if (builder.isEmpty()) {
// This was the last values in the set of values to be deleted.
// this MOD must therefore be skipped.
return false;
}
}
}
m.setAttribute(builder.toAttribute());
if (csn.isNewerThan(getLastUpdateTime())) {
lastUpdateTime = csn;
}
}
return true;
}