internal Type[] KeyPropTypes; // { get; private set; }
/// <summary>
/// Determines whether the specified <see cref="T:System.Object"/> is equal to the current <see cref="T:System.Object"/>.
/// </summary>
/// <param name="obj">The <see cref="T:System.Object"/> to compare with the current <see cref="T:System.Object"/>.</param>
/// <returns>
/// true if the specified <see cref="T:System.Object"/> is equal to the current <see cref="T:System.Object"/>; otherwise, false.
/// </returns>
/// <exception cref="T:System.NullReferenceException">The <paramref name="obj"/> parameter is null.</exception>
public override bool Equals(object obj)
{
if (this == obj)
{
return(true);
}
if (obj == null || GetType() != obj.GetType())
{
return(false);
}
HistoricalStreamIndexDesc that = (HistoricalStreamIndexDesc)obj;
if (!Collections.AreEqual(IndexPropTypes, that.IndexPropTypes))
{
return(false);
}
if (!Collections.AreEqual(IndexProperties, that.IndexProperties))
{
return(false);
}
if (!Collections.AreEqual(KeyPropTypes, that.KeyPropTypes))
{
return(false);
}
return(true);
}
/// <summary>
/// Get the strategies to use for polling from a given stream.
/// </summary>
/// <param name="streamViewStreamNum">the stream providing the polling events</param>
/// <returns>looking and indexing strategy</returns>
public JoinSetComposerPrototypeHistoricalDesc GetStrategy(
int streamViewStreamNum,
StatementRawInfo raw,
SerdeCompileTimeResolver serdeResolver)
{
// If there is only a single polling stream, then build a single index
if (_pollingStreams.Count == 1) {
return JoinSetComposerPrototypeForgeFactory.DetermineIndexing(
_queryGraph,
_typesPerStream[_historicalStreamNum],
_typesPerStream[streamViewStreamNum],
_historicalStreamNum,
streamViewStreamNum,
raw,
serdeResolver);
}
// If there are multiple polling streams, determine if a single index is appropriate.
// An index can be reused if:
// (a) indexed property names are the same
// (b) indexed property types are the same
// (c) key property types are the same (because of coercion)
// A index lookup strategy is always specific to the providing stream.
var additionalForgeables = new List<StmtClassForgeableFactory>();
if (_indexesUsedByStreams == null) {
_indexesUsedByStreams = new LinkedHashMap<HistoricalStreamIndexDesc, IList<int>>();
foreach (var pollingStream in _pollingStreams) {
var queryGraphValue = _queryGraph.GetGraphValue(pollingStream, _historicalStreamNum);
var hashKeyProps = queryGraphValue.HashKeyProps;
var indexProperties = hashKeyProps.Indexed;
var keyTypes = GetPropertyTypes(hashKeyProps.Keys);
var indexTypes = GetPropertyTypes(_typesPerStream[_historicalStreamNum], indexProperties);
var desc = new HistoricalStreamIndexDesc(
indexProperties,
indexTypes,
keyTypes);
var usedByStreams = _indexesUsedByStreams.Get(desc);
if (usedByStreams == null) {
usedByStreams = new List<int>();
_indexesUsedByStreams.Put(desc, usedByStreams);
}
usedByStreams.Add(pollingStream);
}
// There are multiple indexes required:
// Build a master indexing strategy that forms multiple indexes and numbers each.
if (_indexesUsedByStreams.Count > 1) {
var numIndexes = _indexesUsedByStreams.Count;
var indexingStrategies =
new PollResultIndexingStrategyForge[numIndexes];
// create an indexing strategy for each index
var count = 0;
foreach (var desc in _indexesUsedByStreams) {
var sampleStreamViewStreamNum = desc.Value[0];
var indexingX = JoinSetComposerPrototypeForgeFactory.DetermineIndexing(
_queryGraph,
_typesPerStream[_historicalStreamNum],
_typesPerStream[sampleStreamViewStreamNum],
_historicalStreamNum,
sampleStreamViewStreamNum,
raw,
serdeResolver);
indexingStrategies[count] = indexingX.IndexingForge;
additionalForgeables.AddAll(indexingX.AdditionalForgeables);
count++;
}
// create a master indexing strategy that utilizes each indexing strategy to create a set of indexes
_masterIndexingStrategy = new PollResultIndexingStrategyMultiForge(
streamViewStreamNum,
indexingStrategies);
}
}
// there is one type of index
if (_indexesUsedByStreams.Count == 1) {
return JoinSetComposerPrototypeForgeFactory.DetermineIndexing(
_queryGraph,
_typesPerStream[_historicalStreamNum],
_typesPerStream[streamViewStreamNum],
_historicalStreamNum,
streamViewStreamNum,
raw,
serdeResolver);
}
// determine which index number the polling stream must use
var indexUsed = 0;
var found = false;
foreach (var desc in _indexesUsedByStreams.Values) {
if (desc.Contains(streamViewStreamNum)) {
found = true;
break;
}
indexUsed++;
}
if (!found) {
throw new IllegalStateException("Index not found for use by stream " + streamViewStreamNum);
}
// Use one of the indexes built by the master index and a lookup strategy
JoinSetComposerPrototypeHistoricalDesc indexing = JoinSetComposerPrototypeForgeFactory.DetermineIndexing(
_queryGraph,
_typesPerStream[_historicalStreamNum],
_typesPerStream[streamViewStreamNum],
_historicalStreamNum,
streamViewStreamNum,
raw,
serdeResolver);
HistoricalIndexLookupStrategyForge innerLookupStrategy = indexing.LookupForge;
HistoricalIndexLookupStrategyForge lookupStrategy = new HistoricalIndexLookupStrategyMultiForge(indexUsed, innerLookupStrategy);
additionalForgeables.AddAll(indexing.AdditionalForgeables);
return new JoinSetComposerPrototypeHistoricalDesc(lookupStrategy, _masterIndexingStrategy, additionalForgeables);
}
/// <summary>
/// Get the strategies to use for polling from a given stream.
/// </summary>
/// <param name="streamViewStreamNum">the stream providing the polling events</param>
/// <returns>looking and indexing strategy</returns>
public Pair<HistoricalIndexLookupStrategyForge, PollResultIndexingStrategyForge> GetStrategy(
int streamViewStreamNum)
{
// If there is only a single polling stream, then build a single index
if (pollingStreams.Count == 1) {
return JoinSetComposerPrototypeForgeFactory.DetermineIndexing(
queryGraph,
typesPerStream[historicalStreamNum],
typesPerStream[streamViewStreamNum],
historicalStreamNum,
streamViewStreamNum);
}
// If there are multiple polling streams, determine if a single index is appropriate.
// An index can be reused if:
// (a) indexed property names are the same
// (b) indexed property types are the same
// (c) key property types are the same (because of coercion)
// A index lookup strategy is always specific to the providing stream.
if (indexesUsedByStreams == null) {
indexesUsedByStreams = new LinkedHashMap<HistoricalStreamIndexDesc, IList<int>>();
foreach (int pollingStream in pollingStreams) {
QueryGraphValueForge queryGraphValue = queryGraph.GetGraphValue(pollingStream, historicalStreamNum);
QueryGraphValuePairHashKeyIndexForge hashKeyProps = queryGraphValue.HashKeyProps;
string[] indexProperties = hashKeyProps.Indexed;
Type[] keyTypes = GetPropertyTypes(hashKeyProps.Keys);
Type[] indexTypes = GetPropertyTypes(typesPerStream[historicalStreamNum], indexProperties);
HistoricalStreamIndexDesc desc = new HistoricalStreamIndexDesc(
indexProperties,
indexTypes,
keyTypes);
IList<int> usedByStreams = indexesUsedByStreams.Get(desc);
if (usedByStreams == null) {
usedByStreams = new List<int>();
indexesUsedByStreams.Put(desc, usedByStreams);
}
usedByStreams.Add(pollingStream);
}
// There are multiple indexes required:
// Build a master indexing strategy that forms multiple indexes and numbers each.
if (indexesUsedByStreams.Count > 1) {
int numIndexes = indexesUsedByStreams.Count;
PollResultIndexingStrategyForge[] indexingStrategies =
new PollResultIndexingStrategyForge[numIndexes];
// create an indexing strategy for each index
int count = 0;
foreach (KeyValuePair<HistoricalStreamIndexDesc, IList<int>> desc in indexesUsedByStreams) {
int sampleStreamViewStreamNum = desc.Value[0];
indexingStrategies[count] = JoinSetComposerPrototypeForgeFactory.DetermineIndexing(
queryGraph,
typesPerStream[historicalStreamNum],
typesPerStream[sampleStreamViewStreamNum],
historicalStreamNum,
sampleStreamViewStreamNum)
.Second;
count++;
}
// create a master indexing strategy that utilizes each indexing strategy to create a set of indexes
masterIndexingStrategy = new PollResultIndexingStrategyMultiForge(
streamViewStreamNum,
indexingStrategies);
}
}
// there is one type of index
if (indexesUsedByStreams.Count == 1) {
return JoinSetComposerPrototypeForgeFactory.DetermineIndexing(
queryGraph,
typesPerStream[historicalStreamNum],
typesPerStream[streamViewStreamNum],
historicalStreamNum,
streamViewStreamNum);
}
// determine which index number the polling stream must use
int indexUsed = 0;
bool found = false;
foreach (IList<int> desc in indexesUsedByStreams.Values) {
if (desc.Contains(streamViewStreamNum)) {
found = true;
break;
}
indexUsed++;
}
if (!found) {
throw new IllegalStateException("Index not found for use by stream " + streamViewStreamNum);
}
// Use one of the indexes built by the master index and a lookup strategy
HistoricalIndexLookupStrategyForge innerLookupStrategy = JoinSetComposerPrototypeForgeFactory
.DetermineIndexing(
queryGraph,
typesPerStream[historicalStreamNum],
typesPerStream[streamViewStreamNum],
historicalStreamNum,
streamViewStreamNum)
.First;
HistoricalIndexLookupStrategyForge lookupStrategy =
new HistoricalIndexLookupStrategyMultiForge(indexUsed, innerLookupStrategy);
return new Pair<HistoricalIndexLookupStrategyForge, PollResultIndexingStrategyForge>(
lookupStrategy,
masterIndexingStrategy);
}