/// <summary>
/// This method contains the common functionality for updating the hash-index bucket.
/// </summary>
/// <typeparam name="K">key type</typeparam>
/// <typeparam name="V">value type</typeparam>
/// <param name="updatedGrain">the updated grain that is being indexed</param>
/// <param name="update">the update information</param>
/// <param name="state">the index bucket to be updated</param>
/// <param name="isUniqueIndex">a flag to indicate whether the hash-index has a uniqueness constraint</param>
/// <param name="idxMetaData">the index metadata</param>
/// <param name="fixIndexUnavailableOnDelete">output parameter: this variable determines whether
/// the index was still unavailable when we received a delete operation</param>
internal static bool UpdateBucketState <K, V>(V updatedGrain, IMemberUpdate update, HashIndexBucketState <K, V> state, bool isUniqueIndex,
IndexMetaData idxMetaData, out bool fixIndexUnavailableOnDelete) where V : IIndexableGrain
{
fixIndexUnavailableOnDelete = false;
var indexUpdateMode = update.UpdateMode;
var opType = update.OperationType;
HashIndexSingleBucketEntry <V> aftEntry;
// Insert is done for both IndexOperationType.Update and IndexOperationType.Update, so use a local function.
bool doInsert(K afterImage, out bool uniquenessViolation)
{
uniquenessViolation = false;
if (state.IndexMap.TryGetValue(afterImage, out aftEntry))
{
if (!aftEntry.Values.Contains(updatedGrain))
{
if (isUniqueIndex && aftEntry.Values.Count > 0)
{
uniquenessViolation = true;
return(false);
}
aftEntry.Add(updatedGrain, indexUpdateMode, isUniqueIndex);
}
else if (indexUpdateMode == IndexUpdateMode.Tentative)
{
aftEntry.SetTentativeInsert();
}
else
{
aftEntry.ClearTentativeFlag();
}
return(true);
}
// Add a new entry
if (idxMetaData.IsCreatingANewBucketNecessary(state.IndexMap.Count))
{
return(false); // the bucket is full
}
aftEntry = new HashIndexSingleBucketEntry <V>();
aftEntry.Add(updatedGrain, indexUpdateMode, isUniqueIndex);
state.IndexMap.Add(afterImage, aftEntry);
return(true);
}
if (opType == IndexOperationType.Update)
{
K aftImg = (K)update.GetAfterImage();
var befImg = (K)update.GetBeforeImage();
if (state.IndexMap.TryGetValue(befImg, out var befEntry) && befEntry.Values.Contains(updatedGrain))
{
// Delete and Insert
if (state.IndexMap.TryGetValue(aftImg, out aftEntry))
{
if (aftEntry.Values.Contains(updatedGrain))
{
if (indexUpdateMode == IndexUpdateMode.Tentative)
{
aftEntry.SetTentativeInsert();
}
else
{
aftEntry.ClearTentativeFlag();
befEntry.Remove(updatedGrain, indexUpdateMode, isUniqueIndex);
}
}
else
{
if (isUniqueIndex && aftEntry.Values.Count > 0)
{
throw new UniquenessConstraintViolatedException(
$"The uniqueness property of index {idxMetaData.IndexName} is would be violated for an update operation" +
$" for before-image = {befImg}, after-image = {aftImg} and grain = {updatedGrain.GetPrimaryKey()}");
}
befEntry.Remove(updatedGrain, indexUpdateMode, isUniqueIndex);
aftEntry.Add(updatedGrain, indexUpdateMode, isUniqueIndex);
}
}
else
{
aftEntry = new HashIndexSingleBucketEntry <V>();
befEntry.Remove(updatedGrain, indexUpdateMode, isUniqueIndex);
aftEntry.Add(updatedGrain, indexUpdateMode, isUniqueIndex);
state.IndexMap.Add(aftImg, aftEntry);
}
}
else
{
// Insert-only, because Delete was not found. If there's a NextBucket so return false to search it;
// otherwise, the desired Delete result is met (the previous value is not present), so proceed to Insert.
if (idxMetaData.IsChainedBuckets && state.NextBucket != null)
{
return(false);
}
if (!doInsert(aftImg, out bool uniquenessViolation))
{
return(uniquenessViolation
? throw new UniquenessConstraintViolatedException(
$"The uniqueness property of index {idxMetaData.IndexName} would be violated for an update operation" +
$" for (not found before-image = {befImg}), after-image = {aftImg} and grain = {updatedGrain.GetPrimaryKey()}")
: false); // The bucket is full
}
}
}
else if (opType == IndexOperationType.Insert)
{
if (!doInsert((K)update.GetAfterImage(), out bool uniquenessViolation))
{
return(uniquenessViolation
? throw new UniquenessConstraintViolatedException(
$"The uniqueness property of index {idxMetaData.IndexName} would be violated for an insert operation" +
$" for after-image = {(K)update.GetAfterImage()} and grain = {updatedGrain.GetPrimaryKey()}")
: false);
}
}
else if (opType == IndexOperationType.Delete)
{
var befImg = (K)update.GetBeforeImage();
if (state.IndexMap.TryGetValue(befImg, out var befEntry) && befEntry.Values.Contains(updatedGrain))
{
befEntry.Remove(updatedGrain, indexUpdateMode, isUniqueIndex);
if (state.IndexStatus != IndexStatus.Available)
{
fixIndexUnavailableOnDelete = true;
}
}
else if (idxMetaData.IsChainedBuckets)
{
// Not found in this bucket. If there's a NextBucket, return false to search it;
// otherwise, the desired Delete result is met (the value is not present), so return true.
return(state.NextBucket == null);
}
}
return(true);
}
/// <summary>
/// This method contains the common functionality for updating
/// hash-index bucket.
/// </summary>
/// <typeparam name="K">key type</typeparam>
/// <typeparam name="V">value type</typeparam>
/// <param name="updatedGrain">the updated grain that is being indexed</param>
/// <param name="update">the update information</param>
/// <param name="opType">the update operation type, which might be different
/// from the update operation type inside the update parameter</param>
/// <param name="State">the index bucket to be updated</param>
/// <param name="isUniqueIndex">a flag to indicate whether the
/// hash-index has a uniqueness constraint</param>
/// <param name="befImg">output parameter: the before-image</param>
/// <param name="befEntry">output parameter: the index entry containing the before-image</param>
/// <param name="fixIndexUnavailableOnDelete">output parameter: this variable determines whether
/// index was still unavailable when we received a delete operation</param>
internal static bool UpdateBucket <K, V>(V updatedGrain, IMemberUpdate update, HashIndexBucketState <K, V> State, bool isUniqueIndex, IndexMetaData idxMetaData, out K befImg, out HashIndexSingleBucketEntry <V> befEntry, out bool fixIndexUnavailableOnDelete) where V : IIndexableGrain
{
fixIndexUnavailableOnDelete = false;
befImg = default(K);
befEntry = null;
bool isTentativeUpdate = isUniqueIndex && (update is MemberUpdateTentative);
IndexOperationType opType = update.GetOperationType();
HashIndexSingleBucketEntry <V> aftEntry;
if (opType == IndexOperationType.Update)
{
befImg = (K)update.GetBeforeImage();
K aftImg = (K)update.GetAfterImage();
if (State.IndexMap.TryGetValue(befImg, out befEntry) && befEntry.Values.Contains(updatedGrain))
{ //Delete and Insert
if (State.IndexMap.TryGetValue(aftImg, out aftEntry))
{
if (aftEntry.Values.Contains(updatedGrain))
{
if (isTentativeUpdate)
{
aftEntry.setTentativeInsert();
}
else
{
aftEntry.clearTentativeFlag();
befEntry.Remove(updatedGrain, isTentativeUpdate, isUniqueIndex);
}
}
else
{
if (isUniqueIndex && aftEntry.Values.Count > 0)
{
throw new UniquenessConstraintViolatedException(string.Format("The uniqueness property of index is violated after an update operation for before-image = {0}, after-image = {1} and grain = {2}", befImg, aftImg, updatedGrain.GetPrimaryKey()));
}
befEntry.Remove(updatedGrain, isTentativeUpdate, isUniqueIndex);
aftEntry.Add(updatedGrain, isTentativeUpdate, isUniqueIndex);
}
}
else
{
aftEntry = new HashIndexSingleBucketEntry <V>();
befEntry.Remove(updatedGrain, isTentativeUpdate, isUniqueIndex);
aftEntry.Add(updatedGrain, isTentativeUpdate, isUniqueIndex);
State.IndexMap.Add(aftImg, aftEntry);
}
}
else
{
if (idxMetaData.IsChainedBuckets())
{
return(false); //not found in this bucket
}
//Insert
if (State.IndexMap.TryGetValue(aftImg, out aftEntry))
{
if (!aftEntry.Values.Contains(updatedGrain))
{
if (isUniqueIndex && aftEntry.Values.Count > 0)
{
throw new UniquenessConstraintViolatedException(string.Format("The uniqueness property of index is violated after an update operation for (not found before-image = {0}), after-image = {1} and grain = {2}", befImg, aftImg, updatedGrain.GetPrimaryKey()));
}
aftEntry.Add(updatedGrain, isTentativeUpdate, isUniqueIndex);
}
else if (isTentativeUpdate)
{
aftEntry.setTentativeInsert();
}
else
{
aftEntry.clearTentativeFlag();
}
}
else
{
if (idxMetaData.IsCreatingANewBucketNecessary(State.IndexMap.Count()))
{
return(false);
}
aftEntry = new HashIndexSingleBucketEntry <V>();
aftEntry.Add(updatedGrain, isTentativeUpdate, isUniqueIndex);
State.IndexMap.Add(aftImg, aftEntry);
}
}
}
else if (opType == IndexOperationType.Insert)
{ // Insert
K aftImg = (K)update.GetAfterImage();
if (State.IndexMap.TryGetValue(aftImg, out aftEntry))
{
if (!aftEntry.Values.Contains(updatedGrain))
{
if (isUniqueIndex && aftEntry.Values.Count > 0)
{
throw new UniquenessConstraintViolatedException(string.Format("The uniqueness property of index is violated after an insert operation for after-image = {0} and grain = {1}", aftImg, updatedGrain.GetPrimaryKey()));
}
aftEntry.Add(updatedGrain, isTentativeUpdate, isUniqueIndex);
}
else if (isTentativeUpdate)
{
aftEntry.setTentativeInsert();
}
else
{
aftEntry.clearTentativeFlag();
}
}
else
{
if (idxMetaData.IsCreatingANewBucketNecessary(State.IndexMap.Count()))
{
return(false); //the bucket is full
}
aftEntry = new HashIndexSingleBucketEntry <V>();
aftEntry.Add(updatedGrain, isTentativeUpdate, isUniqueIndex);
State.IndexMap.Add(aftImg, aftEntry);
}
}
else if (opType == IndexOperationType.Delete)
{ // Delete
befImg = (K)update.GetBeforeImage();
if (State.IndexMap.TryGetValue(befImg, out befEntry) && befEntry.Values.Contains(updatedGrain))
{
befEntry.Remove(updatedGrain, isTentativeUpdate, isUniqueIndex);
if (State.IndexStatus != IndexStatus.Available)
{
fixIndexUnavailableOnDelete = true;
}
}
else if (idxMetaData.IsChainedBuckets())
{
return(false); //not found in this bucket
}
}
return(true);
}