/// <summary>
/// Provides for defering the execution of the <paramref name="source"/> query to a batch of future queries.
/// </summary>
/// <typeparam name="T">The type of the elements of <paramref name="source"/>.</typeparam>
/// <param name="source">An <see cref="T:System.Linq.IQueryable`1"/> to add to the batch of future queries.</param>
/// <param name="cacheSettings">The cache settings.</param>
/// <returns>
/// An instance of <see cref="FutureCount"/> that contains the result of the query.
/// </returns>
/// <seealso cref="T:CodeSmith.Data.Linq.FutureCount"/>
public static FutureCount FutureCacheCount <T>(this IQueryable <T> source, CacheSettings cacheSettings)
{
if (source == null)
{
return(new FutureCount(0));
}
IFutureContext db = GetFutureContext(source);
var future = new FutureCount(source, db.ExecuteFutureQueries, cacheSettings);
db.FutureQueries.Add(future);
return(future);
}
/// <summary>
/// Provides for defering the execution of the <paramref name="source"/> query to a batch of future queries.
/// </summary>
/// <typeparam name="T">The type of the elements of <paramref name="source"/>.</typeparam>
/// <param name="source">An <see cref="T:System.Linq.IQueryable`1"/> to add to the batch of future queries.</param>
/// <param name="cacheSettings">The cache settings.</param>
/// <returns>
/// An <see cref="T:System.Collections.Generic.IEnumerable`1"/> that contains elements from the input sequence.
/// </returns>
/// <seealso cref="T:CodeSmith.Data.Linq.FutureQuery`1"/>
public static FutureQuery <T> FutureCache <T>(this IQueryable <T> source, CacheSettings cacheSettings)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
IFutureContext db = GetFutureContext(source);
var future = new FutureQuery <T>(source, db.ExecuteFutureQueries, cacheSettings);
db.FutureQueries.Add(future);
return(future);
}
/// <summary>
/// Provides for defering the execution of the <paramref name="source"/> query to a batch of future queries.
/// </summary>
/// <typeparam name="T">The type of the elements of <paramref name="source"/>.</typeparam>
/// <param name="source">An <see cref="T:System.Linq.IQueryable`1"/> to add to the batch of future queries.</param>
/// <param name="cacheSettings">The cache settings.</param>
/// <returns>
/// An instance of <see cref="T:CodeSmith.Data.Linq.FutureValue`1"/> that contains the result of the query.
/// </returns>
/// <seealso cref="T:CodeSmith.Data.Linq.FutureValue`1"/>
public static FutureValue <T> FutureCacheFirstOrDefault <T>(this IQueryable <T> source, CacheSettings cacheSettings)
{
if (source == null)
{
return(new FutureValue <T>(default(T)));
}
// make sure to only get the first value
var firstQuery = source.Take(1);
IFutureContext db = GetFutureContext(source);
var future = new FutureValue <T>(firstQuery, db.ExecuteFutureQueries, cacheSettings);
db.FutureQueries.Add(future);
return(future);
}
private static IFutureContext GetFutureContext(IQueryable source)
{
DataContext context = source.GetDataContext();
if (context == null)
{
throw new ArgumentException("The source must originate from a DataContext that implements IFutureContext.", "source");
}
IFutureContext futureContext = context as IFutureContext;
if (futureContext == null)
{
throw new ArgumentException("The source must originate from a DataContext that implements IFutureContext.", "source");
}
return(futureContext);
}
/// <summary>
/// Initializes a new instance of the <see cref="FutureCount" /> class.
/// </summary>
/// <param name="query">The query source to use when materializing.</param>
/// <param name="futureContext">The future context.</param>
internal FutureCount(IQueryable <int> query, IFutureContext futureContext)
: base(query, futureContext)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="T:EntityFramework.Future.FutureQuery`1" /> class.
/// </summary>
/// <param name="query">The query source to use when materializing.</param>
/// <param name="futureContext">The future context.</param>
internal FutureQuery(IQueryable <T> query, IFutureContext futureContext)
: base(query, futureContext)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="FutureQuery<T>" /> class.
/// </summary>
/// <param name="query">The query source to use when materializing.</param>
/// <param name="futureContext">The future context.</param>
protected FutureQueryBase(IQueryable <T> query, IFutureContext futureContext)
{
_query = query;
_futureContext = futureContext;
//_result = null;
}
