/// <summary>
/// Creates a proxy for a given type. This method supports two discrete usage scenarios.<p/>
/// If T is an interface, the target should be an implementation of that interface. In
/// this scenario, T should be <i>explicitly</i> specified unless the type of <i>target</i>
/// at the calling site is of that interface. In other words, if the calling site has the
/// <i>target</i> declared as the concrete implementation, the proxy will be generated
/// for the implementation, rather than for the interface.
///
/// If T is a class, the target should be an instance of that class, and a subclassing
/// proxy will be created for it. However, because target is specified in this case,
/// the base class behavior will be ignored (it will all be delegated to the target).
/// </summary>
/// <typeparam name="T">The type to create the proxy for. May be an interface or a
/// concrete base class.</typeparam>
/// <param name="invocationHandler">This is where you get to inject your logic.</param>
/// <param name="predicate">Optional predicate to determine if the interception should happen. Useful
/// improving performance in certain situations</param>
/// <returns>The new instance of the proxy that is an instance of T</returns>
public static T CreateProxy <T>(Func <Invocation, object> invocationHandler, ProxyPredicate <T> predicate = null)
{
return(Proxy <T> .CreateProxy(default(T), invocationHandler, predicate));
}
/// <summary>
/// Creates a proxy for a given type. This method supports two discrete usage scenarios.<p/>
/// If T is an interface, the target should be an implementation of that interface. In
/// this scenario, T should be <i>explicitly</i> specified unless the type of <i>target</i>
/// at the calling site is of that interface. In other words, if the calling site has the
/// <i>target</i> declared as the concrete implementation, the proxy will be generated
/// for the implementation, rather than for the interface.
///
/// If T is a class, the target should be an instance of that class, and a subclassing
/// proxy will be created for it. However, because target is specified in this case,
/// the base class behavior will be ignored (it will all be delegated to the target).
/// </summary>
/// <typeparam name="T">The type to create the proxy for. May be an interface or a
/// concrete base class.</typeparam>
/// <param name="invocationHandler">This is where you get to inject your logic.</param>
/// <param name="predicate">Optional predicate to determine if the interception should happen. Useful
/// improving performance in certain situations</param>
/// <param name="asyncMode">Controls what happens when an async invocation handler performs async related actions
/// where the original method being proxied is not an async method.</param>
/// <returns>The new instance of the proxy that is an instance of T</returns>
public static T CreateProxy <T>(Func <Invocation, Task <object> > invocationHandler, ProxyPredicate <T> predicate = null,
AsyncInvocationMode asyncMode = AsyncInvocationMode.Throw)
{
return(CreateProxy(default(T), invocationHandler, predicate, asyncMode));
}
/// <summary>
/// Creates a proxy for a given type. This method supports two discrete usage scenarios.<p/>
/// If T is an interface, the target should be an implementation of that interface. In
/// this scenario, T should be <i>explicitly</i> specified unless the type of <i>target</i>
/// at the calling site is of that interface. In other words, if the calling site has the
/// <i>target</i> declared as the concrete implementation, the proxy will be generated
/// for the implementation, rather than for the interface.
///
/// If T is a class, the target should be an instance of that class, and a subclassing
/// proxy will be created for it. However, because target is specified in this case,
/// the base class behavior will be ignored (it will all be delegated to the target).
/// </summary>
/// <typeparam name="T">The type to create the proxy for. May be an interface or a
/// concrete base class.</typeparam>
/// <param name="target">The instance of T that should be the recipient of all invocations
/// on the proxy via Invocation.Proceed.</param>
/// <param name="invocationHandler">This is where you get to inject your logic.</param>
/// <param name="predicate">Optional predicate to determine if the interception should happen. Useful
/// improving performance in certain situations</param>
/// <param name="asyncMode">Controls what happens when an async invocation handler performs async related actions
/// where the original method being proxied is not an async method.</param>
/// <returns>The new instance of the proxy that is an instance of T</returns>
public static T CreateProxy <T>(T target, Func <Invocation, Task <object> > invocationHandler, ProxyPredicate <T> predicate = null,
AsyncInvocationMode asyncMode = AsyncInvocationMode.Throw)
{
return(Proxy <T> .CreateProxy(target, invocationHandler, predicate, asyncMode));
}
/// <summary>
/// Creates a proxy for a given type. This method supports two discrete usage scenarios.<p/>
/// If T is an interface, the target should be an implementation of that interface. In
/// this scenario, T should be <i>explicitly</i> specified unless the type of <i>target</i>
/// at the calling site is of that interface. In other words, if the calling site has the
/// <i>target</i> declared as the concrete implementation, the proxy will be generated
/// for the implementation, rather than for the interface.
///
/// If T is a class, the target should be an instance of that class, and a subclassing
/// proxy will be created for it. However, because target is specified in this case,
/// the base class behavior will be ignored (it will all be delegated to the target).
/// </summary>
/// <typeparam name="T">The type to create the proxy for. May be an interface or a
/// concrete base class.</typeparam>
/// <param name="target">The instance of T that should be the recipient of all invocations
/// on the proxy via Invocation.Proceed.</param>
/// <param name="invocationHandler">This is where you get to inject your logic.</param>
/// <param name="predicate">Optional predicate to determine if the interception should happen. Useful
/// improving performance in certain situations</param>
/// <returns>The new instance of the proxy that is an instance of T</returns>
public static T CreateProxy <T>(T target, Func <Invocation, object> invocationHandler, ProxyPredicate <T> predicate = null)
{
return(Proxy <T> .CreateProxy(target, invocationHandler, predicate));
}
public QueryPlan GetQueryPlan(IDmObject parsedQuery, IQuery query, IQueryStore queryStore, MetadataIndex rowsEnumerator)
{
//Todo: Plan's cache's key decision (query-string based plan cache/optimizable-section based cache).
OrderedList <double, IProxyPredicate> sortedPlans = new OrderedList <double, IProxyPredicate>();
var optimizableQuery = parsedQuery as IFilterObject;
var criteria = AddQueryCriteria(parsedQuery, query.Parameters, queryStore);
var queryPlan = new QueryPlan {
Criteria = criteria
};
if (optimizableQuery != null && optimizableQuery.WherePredicate != null)
{
ITreePredicate whereExpression = optimizableQuery.WherePredicate;
ITreePredicate contractedExpression = whereExpression.Contract();
if (contractedExpression == null)
{
contractedExpression = whereExpression;
}
List <ITreePredicate> distribCombinations = new List <ITreePredicate>();
distribCombinations.Add(contractedExpression);
//Todo: Restrict this call if there doesn't exist a compound index.
while (contractedExpression.Expand() != null)
{
distribCombinations.Add(contractedExpression.Expand());
contractedExpression = contractedExpression.Expand();
}
foreach (var treePredicate in distribCombinations)
{
if (treePredicate is OrTreePredicate || treePredicate is AndTreePredicate)
{
break;
}
if (treePredicate is ComparisonPredicate)
{
DocumentKey documentKey = null;
if (((ComparisonPredicate)treePredicate).TryGetProxyKeyPredicate(rowsEnumerator, out documentKey))
{
IProxyPredicate optimizablePredicate = new ProxyPredicate(new KeyPredicate(documentKey, rowsEnumerator), treePredicate);
sortedPlans.Add(optimizablePredicate.Statistics[Statistic.ExpectedIO], optimizablePredicate);
queryPlan.Predicate = sortedPlans.FirstValues[0].GetExecutionPredicate(queryStore);
return(queryPlan);
}
}
}
foreach (var expressionState in distribCombinations)
{
IProxyPredicate optimizablePredicate = expressionState.GetProxyExecutionPredicate(_indexManager, queryStore, rowsEnumerator);
sortedPlans.Add(optimizablePredicate.Statistics[Statistic.ExpectedIO], optimizablePredicate);
//Todo: Add optimizedPredicate to the SortedList by the cost.
}
queryPlan.Predicate = sortedPlans.FirstValues[0].GetExecutionPredicate(queryStore);
}
else
{
if (criteria.GroupFields != null && criteria.GroupFields.Count == 1 && criteria.GroupFields[0] is AllField && criteria.ContainsAggregations)
{
if (criteria.Aggregations.Count == 1 && criteria.Aggregations[0].Aggregation is COUNT &&
criteria.Aggregations[0].Evaluation is AllEvaluable)
{
queryPlan.Criteria.GroupByField = null;
queryPlan.Predicate = new SpecialCountPredicate(rowsEnumerator.KeyCount);
queryPlan.IsSpecialExecution = true;
return(queryPlan);
}
}
//Todo:1 Projection variable-based index assigning (Functions' arguments + attributes).
queryPlan.Predicate = GetSelectAllPredicate(criteria, rowsEnumerator);
}
return(queryPlan);
}
