/// <summary>
/// Creates a strategy implementation that indicates to subscribers
/// the statement results based on the select-clause columns.
/// </summary>
/// <param name="statement">The statement.</param>
/// <param name="subscriber">to indicate to</param>
/// <param name="selectClauseTypes">are the types of each column in the select clause</param>
/// <param name="selectClauseColumns">the names of each column in the select clause</param>
/// <param name="engineURI">The engine URI.</param>
/// <param name="engineImportService">The engine import service.</param>
/// <returns>
/// strategy for dispatching naturals
/// </returns>
/// <exception cref="EPSubscriberException">
/// </exception>
/// <throws>EPSubscriberException if the subscriber is invalid</throws>
public static ResultDeliveryStrategy Create(
EPStatement statement,
EPSubscriber subscriber,
Type[] selectClauseTypes,
string[] selectClauseColumns,
string engineURI,
EngineImportService engineImportService)
{
var subscriberObject = subscriber.Subscriber;
var subscriberMethod = subscriber.SubscriberMethod;
if (selectClauseTypes == null)
{
selectClauseTypes = new Type[0];
selectClauseColumns = new string[0];
}
var subscriberType = subscriberObject.GetType();
if (subscriberMethod == null)
{
if (subscriberType.IsDelegate())
{
subscriberMethod = "Invoke";
}
else
{
subscriberMethod = "Update";
}
}
// Locate Update methods
MethodInfo subscriptionMethod = null;
var updateMethods = subscriberType
.GetMethods()
.Where(method => (method.Name == subscriberMethod) && (method.IsPublic))
.OrderBy(method => IsFirstParameterEPStatement(method) ? 0 : 1)
.ToDictionary(method => method, GetMethodParameterTypesWithoutEPStatement);
// none found
if (updateMethods.Count == 0)
{
var message = "Subscriber object does not provide a public method by name '" + subscriberMethod + "'";
throw new EPSubscriberException(message);
}
// match to parameters
var isMapArrayDelivery = false;
var isObjectArrayDelivery = false;
var isSingleRowMap = false;
var isSingleRowObjectArr = false;
var isTypeArrayDelivery = false;
// find an exact-matching method: no conversions and not even unboxing/boxing
foreach (var methodNormParameterEntry in updateMethods)
{
var normalized = methodNormParameterEntry.Value;
if (normalized.Length == selectClauseTypes.Length)
{
var fits = true;
for (var i = 0; i < normalized.Length; i++)
{
if ((selectClauseTypes[i] != null) && (selectClauseTypes[i] != normalized[i]))
{
fits = false;
break;
}
}
if (fits)
{
subscriptionMethod = methodNormParameterEntry.Key;
break;
}
}
}
// when not yet resolved, find an exact-matching method with boxing/unboxing
if (subscriptionMethod == null)
{
foreach (var methodNormParameterEntry in updateMethods)
{
var normalized = methodNormParameterEntry.Value;
if (normalized.Length == selectClauseTypes.Length)
{
var fits = true;
for (var i = 0; i < normalized.Length; i++)
{
var boxedExpressionType = selectClauseTypes[i].GetBoxedType();
var boxedParameterType = normalized[i].GetBoxedType();
if ((boxedExpressionType != null) && (boxedExpressionType != boxedParameterType))
{
fits = false;
break;
}
}
if (fits)
{
subscriptionMethod = methodNormParameterEntry.Key;
break;
}
}
}
}
// when not yet resolved, find assignment-compatible methods that may require widening (including Integer to Long etc.)
var checkWidening = false;
if (subscriptionMethod == null)
{
foreach (var methodNormParameterEntry in updateMethods)
{
var normalized = methodNormParameterEntry.Value;
if (normalized.Length == selectClauseTypes.Length)
{
var fits = true;
for (var i = 0; i < normalized.Length; i++)
{
var parameterType = normalized[i];
var selectClauseType = selectClauseTypes[i];
var boxedExpressionType = selectClauseType.GetBoxedType();
var boxedParameterType = parameterType.GetBoxedType();
if (((selectClauseType == null) || (!selectClauseType.IsAssignmentCompatible(parameterType))) &&
((boxedExpressionType == null) || (!boxedExpressionType.IsAssignmentCompatible(boxedParameterType))))
{
fits = false;
break;
}
}
if (fits)
{
subscriptionMethod = methodNormParameterEntry.Key;
checkWidening = true;
break;
}
}
}
}
// when not yet resolved, find first-fit wildcard method
if (subscriptionMethod == null)
{
foreach (var methodNormParameterEntry in updateMethods)
{
var normalized = methodNormParameterEntry.Value;
if ((normalized.Length == 1) && (normalized[0] == typeof(DataMap)))
{
isSingleRowMap = true;
subscriptionMethod = methodNormParameterEntry.Key;
break;
}
if ((normalized.Length == 1) && (normalized[0] == typeof(object[])))
{
isSingleRowObjectArr = true;
subscriptionMethod = methodNormParameterEntry.Key;
break;
}
if ((normalized.Length == 2) && (normalized[0] == typeof(DataMap[])) &&
(normalized[1] == typeof(DataMap[])))
{
subscriptionMethod = methodNormParameterEntry.Key;
isMapArrayDelivery = true;
break;
}
if ((normalized.Length == 2) && (normalized[0] == typeof(object[][])) &&
(normalized[1] == typeof(object[][])))
{
subscriptionMethod = methodNormParameterEntry.Key;
isObjectArrayDelivery = true;
break;
}
// Handle uniform underlying or column type array dispatch
if ((normalized.Length == 2) && (normalized[0].Equals(normalized[1])) && (normalized[0].IsArray) &&
(selectClauseTypes.Length == 1))
{
var componentType = normalized[0].GetElementType();
if (selectClauseTypes[0].IsAssignmentCompatible(componentType))
{
subscriptionMethod = methodNormParameterEntry.Key;
isTypeArrayDelivery = true;
break;
}
}
if ((normalized.Length == 0) && (selectClauseTypes.Length == 1) && (selectClauseTypes[0] == null))
{
subscriptionMethod = methodNormParameterEntry.Key;
}
}
}
if (subscriptionMethod == null)
{
if (updateMethods.Count > 1)
{
var parametersDesc = TypeHelper.GetParameterAsString(selectClauseTypes);
var message =
"No suitable subscriber method named 'Update' found, expecting a method that takes " +
selectClauseTypes.Length + " parameter of type " + parametersDesc;
throw new EPSubscriberException(message);
}
else
{
var firstUpdateMethod = updateMethods.First();
var parametersNormalized = firstUpdateMethod.Value;
var parametersDescNormalized = TypeHelper.GetParameterAsString(selectClauseTypes);
if (parametersNormalized.Length != selectClauseTypes.Length)
{
if (selectClauseTypes.Length > 0)
{
var message =
"No suitable subscriber method named 'Update' found, expecting a method that takes " +
selectClauseTypes.Length + " parameter of type " + parametersDescNormalized;
throw new EPSubscriberException(message);
}
else
{
var message =
"No suitable subscriber method named 'Update' found, expecting a method that takes no parameters";
throw new EPSubscriberException(message);
}
}
for (var i = 0; i < parametersNormalized.Length; i++)
{
var boxedExpressionType = selectClauseTypes[i].GetBoxedType();
var boxedParameterType = parametersNormalized[i].GetBoxedType();
if ((boxedExpressionType != null) &&
(!boxedExpressionType.IsAssignmentCompatible(boxedParameterType)))
{
var message = "Subscriber method named 'Update' for parameter number " + (i + 1) +
" is not assignable, " +
"expecting type '" + selectClauseTypes[i].GetParameterAsString() +
"' but found type '"
+ parametersNormalized[i].GetParameterAsString() + "'";
throw new EPSubscriberException(message);
}
}
}
}
var parameterTypes = subscriptionMethod.GetParameterTypes();
// Invalid if there is a another footprint for the subscription method that does not include EPStatement if present
var firstParameterIsEPStatement = IsFirstParameterEPStatement(subscriptionMethod);
if (isMapArrayDelivery)
{
return(firstParameterIsEPStatement
? new ResultDeliveryStrategyMapWStmt(statement, subscriberObject, subscriptionMethod, selectClauseColumns, engineImportService)
: new ResultDeliveryStrategyMap(statement, subscriberObject, subscriptionMethod, selectClauseColumns, engineImportService));
}
else if (isObjectArrayDelivery)
{
return(firstParameterIsEPStatement
? new ResultDeliveryStrategyObjectArrWStmt(statement, subscriberObject, subscriptionMethod, engineImportService)
: new ResultDeliveryStrategyObjectArr(statement, subscriberObject, subscriptionMethod, engineImportService));
}
else if (isTypeArrayDelivery)
{
return(firstParameterIsEPStatement
? new ResultDeliveryStrategyTypeArrWStmt(statement, subscriberObject, subscriptionMethod, parameterTypes[1].GetElementType(), engineImportService)
: new ResultDeliveryStrategyTypeArr(statement, subscriberObject, subscriptionMethod, parameterTypes[0].GetElementType(), engineImportService));
}
// Try to find the "start", "end" and "updateRStream" methods
MethodInfo startMethod = null;
MethodInfo endMethod = null;
MethodInfo rStreamMethod = null;
startMethod = subscriberObject.GetType().GetMethod("UpdateStart", new Type[] { typeof(EPStatement), typeof(int), typeof(int) });
if (startMethod == null)
{
startMethod = subscriberObject.GetType().GetMethod("UpdateStart", new Type[] { typeof(int), typeof(int) });
}
endMethod = subscriberObject.GetType().GetMethod("UpdateEnd", new Type[] { typeof(EPStatement) });
if (endMethod == null)
{
endMethod = subscriberObject.GetType().GetMethod("UpdateEnd");
}
// must be exactly the same footprint (may include EPStatement), since delivery convertor used for both
rStreamMethod = subscriberObject.GetType().GetMethod("UpdateRStream", parameterTypes);
if (rStreamMethod == null)
{
// we don't have an "updateRStream" expected, make sure there isn't one with/without EPStatement
if (IsFirstParameterEPStatement(subscriptionMethod))
{
var classes = updateMethods.Get(subscriptionMethod);
ValidateNonMatchUpdateRStream(subscriberObject, classes);
}
else
{
var classes = new Type[parameterTypes.Length + 1];
classes[0] = typeof(EPStatement);
Array.Copy(parameterTypes, 0, classes, 1, parameterTypes.Length);
ValidateNonMatchUpdateRStream(subscriberObject, classes);
}
}
DeliveryConvertor convertor;
if (isSingleRowMap)
{
convertor = firstParameterIsEPStatement
? (DeliveryConvertor) new DeliveryConvertorMapWStatement(selectClauseColumns, statement)
: (DeliveryConvertor) new DeliveryConvertorMap(selectClauseColumns);
}
else if (isSingleRowObjectArr)
{
convertor = firstParameterIsEPStatement
? (DeliveryConvertor) new DeliveryConvertorObjectArrWStatement(statement)
: (DeliveryConvertor)DeliveryConvertorObjectArr.INSTANCE;
}
else
{
if (checkWidening)
{
var normalizedParameters = updateMethods.Get(subscriptionMethod);
convertor = DetermineWideningDeliveryConvertor(
firstParameterIsEPStatement, statement, selectClauseTypes, normalizedParameters,
subscriptionMethod, engineURI);
}
else
{
convertor = firstParameterIsEPStatement
? (DeliveryConvertor) new DeliveryConvertorNullWStatement(statement)
: (DeliveryConvertor)DeliveryConvertorNull.INSTANCE;
}
}
return(new ResultDeliveryStrategyImpl(
statement, subscriberObject, convertor, subscriptionMethod, startMethod, endMethod, rStreamMethod, engineImportService));
}
/// <summary>
/// Creates a strategy implementation that indicates to subscribers the statement results based on the select-clause columns.
/// </summary>
/// <param name="statementName">Name of the statement.</param>
/// <param name="subscriber">to indicate to</param>
/// <param name="selectClauseTypes">are the types of each column in the select clause</param>
/// <param name="selectClauseColumns">the names of each column in the select clause</param>
/// <returns>strategy for dispatching naturals</returns>
/// <throws>EPSubscriberException if the subscriber is invalid</throws>
public static ResultDeliveryStrategy Create(
string statementName,
EPSubscriber subscriber,
Type[] selectClauseTypes,
string[] selectClauseColumns)
{
var subscriberObject = subscriber.Subscriber;
var subscriberMethod = subscriber.SubscriberMethod;
if (selectClauseTypes == null)
{
selectClauseTypes = new Type[0];
selectClauseColumns = new String[0];
}
var subscriberType = subscriberObject.GetType();
if (subscriberMethod == null)
{
if (subscriberType.IsDelegate())
{
subscriberMethod = "Invoke";
}
else
{
subscriberMethod = "Update";
}
}
// Locate Update methods
MethodInfo subscriptionMethod = null;
List <MethodInfo> updateMethods;
updateMethods = subscriberType
.GetMethods()
.Where(method => (method.Name == subscriberMethod) && (method.IsPublic))
.ToList();
// none found
if (updateMethods.Count == 0)
{
String message = "EPSubscriber object does not provide a public method by name '" + subscriberMethod + "'";
throw new EPSubscriberException(message);
}
// match to parameters
bool isMapArrayDelivery = false;
bool isObjectArrayDelivery = false;
bool isSingleRowMap = false;
bool isSingleRowObjectArr = false;
bool isTypeArrayDelivery = false;
// find an exact-matching method: no conversions and not even unboxing/boxing
foreach (MethodInfo method in updateMethods)
{
Type[] parameters = method.GetParameterTypes();
if (parameters.Length == selectClauseTypes.Length)
{
bool fits = true;
for (int i = 0; i < parameters.Length; i++)
{
if ((selectClauseTypes[i] != null) && (selectClauseTypes[i] != parameters[i]))
{
fits = false;
break;
}
}
if (fits)
{
subscriptionMethod = method;
break;
}
}
}
// when not yet resolved, find an exact-matching method with boxing/unboxing
if (subscriptionMethod == null)
{
foreach (MethodInfo method in updateMethods)
{
Type[] parameters = method.GetParameterTypes();
if (parameters.Length == selectClauseTypes.Length)
{
bool fits = true;
for (int i = 0; i < parameters.Length; i++)
{
Type boxedExpressionType = selectClauseTypes[i].GetBoxedType();
Type boxedParameterType = parameters[i].GetBoxedType();
if ((boxedExpressionType != null) && (boxedExpressionType != boxedParameterType))
{
fits = false;
break;
}
}
if (fits)
{
subscriptionMethod = method;
break;
}
}
}
}
// when not yet resolved, find assignment-compatible methods that may require widening (including Integer to Long etc.)
bool checkWidening = false;
if (subscriptionMethod == null)
{
foreach (MethodInfo method in updateMethods)
{
Type[] parameters = method.GetParameterTypes();
if (parameters.Length == selectClauseTypes.Length)
{
bool fits = true;
for (int i = 0; i < parameters.Length; i++)
{
Type boxedExpressionType = selectClauseTypes[i].GetBoxedType();
Type boxedParameterType = parameters[i].GetBoxedType();
if ((boxedExpressionType != null) &&
(!boxedExpressionType.IsAssignmentCompatible(boxedParameterType)))
{
fits = false;
break;
}
}
if (fits)
{
subscriptionMethod = method;
checkWidening = true;
break;
}
}
}
}
// when not yet resolved, find first-fit wildcard method
if (subscriptionMethod == null)
{
foreach (MethodInfo method in updateMethods)
{
Type[] parameters = method.GetParameterTypes();
if ((parameters.Length == 1) && (parameters[0] == typeof(DataMap)))
{
isSingleRowMap = true;
subscriptionMethod = method;
break;
}
if ((parameters.Length == 1) && (parameters[0] == typeof(Object[])))
{
isSingleRowObjectArr = true;
subscriptionMethod = method;
break;
}
if ((parameters.Length == 2) && (parameters[0] == typeof(DataMap[])) &&
(parameters[1] == typeof(DataMap[])))
{
subscriptionMethod = method;
isMapArrayDelivery = true;
break;
}
if ((parameters.Length == 2) && (parameters[0] == typeof(Object[][])) &&
(parameters[1] == typeof(Object[][])))
{
subscriptionMethod = method;
isObjectArrayDelivery = true;
break;
}
// Handle uniform underlying or column type array dispatch
if ((parameters.Length == 2) && (parameters[0].Equals(parameters[1])) && (parameters[0].IsArray) &&
(selectClauseTypes.Length == 1))
{
Type componentType = parameters[0].GetElementType();
if (selectClauseTypes[0].IsAssignmentCompatible(componentType))
{
subscriptionMethod = method;
isTypeArrayDelivery = true;
break;
}
}
if ((parameters.Length == 0) && (selectClauseTypes.Length == 1) && (selectClauseTypes[0] == null))
{
subscriptionMethod = method;
}
}
}
if (subscriptionMethod == null)
{
if (updateMethods.Count > 1)
{
String parametersDesc = TypeHelper.GetParameterAsString(selectClauseTypes);
String message =
"No suitable subscriber method named 'Update' found, expecting a method that takes " +
selectClauseTypes.Length + " parameter of type " + parametersDesc;
throw new EPSubscriberException(message);
}
else
{
Type[] parameters = updateMethods[0].GetParameterTypes();
String parametersDesc = TypeHelper.GetParameterAsString(selectClauseTypes);
if (parameters.Length != selectClauseTypes.Length)
{
if (selectClauseTypes.Length > 0)
{
String message =
"No suitable subscriber method named 'Update' found, expecting a method that takes " +
selectClauseTypes.Length + " parameter of type " + parametersDesc;
throw new EPSubscriberException(message);
}
else
{
String message =
"No suitable subscriber method named 'Update' found, expecting a method that takes no parameters";
throw new EPSubscriberException(message);
}
}
for (int i = 0; i < parameters.Length; i++)
{
Type boxedExpressionType = selectClauseTypes[i].GetBoxedType();
Type boxedParameterType = parameters[i].GetBoxedType();
if ((boxedExpressionType != null) &&
(!boxedExpressionType.IsAssignmentCompatible(boxedParameterType)))
{
String message = "EPSubscriber method named 'Update' for parameter number " + (i + 1) +
" is not assignable, " +
"expecting type '" + selectClauseTypes[i].GetParameterAsString() +
"' but found type '"
+ parameters[i].GetParameterAsString() + "'";
throw new EPSubscriberException(message);
}
}
}
}
if (isMapArrayDelivery)
{
return(new ResultDeliveryStrategyMap(statementName, subscriberObject, subscriptionMethod, selectClauseColumns));
}
else if (isObjectArrayDelivery)
{
return(new ResultDeliveryStrategyObjectArr(statementName, subscriberObject, subscriptionMethod));
}
else if (isTypeArrayDelivery)
{
return(new ResultDeliveryStrategyTypeArr(statementName, subscriberObject, subscriptionMethod));
}
// Try to find the "start", "end" and "updateRStream" methods
MethodInfo startMethod = subscriberObject.GetType().GetMethod(
"UpdateStart", new Type[]
{
typeof(int), typeof(int)
});
MethodInfo endMethod = subscriberObject.GetType().GetMethod(
"UpdateEnd");
MethodInfo rStreamMethod = subscriberObject.GetType().GetMethod(
"UpdateRStream", subscriptionMethod.GetParameterTypes());
DeliveryConvertor convertor;
if (isSingleRowMap)
{
convertor = new DeliveryConvertorMap(selectClauseColumns);
}
else if (isSingleRowObjectArr)
{
convertor = new DeliveryConvertorObjectArr();
}
else
{
if (checkWidening)
{
convertor = DetermineWideningDeliveryConvertor(
selectClauseTypes, subscriptionMethod.GetParameterTypes(), subscriptionMethod);
}
else
{
convertor = DeliveryConvertorNull.INSTANCE;
}
}
return(new ResultDeliveryStrategyImpl(
statementName, subscriberObject, convertor, subscriptionMethod, startMethod, endMethod, rStreamMethod));
}