/// <summary>
/// Run shopping cart analysis on ScaleOut's distributed data grid
/// using Invoke() and Merge() extension methods.
/// </summary>
/// <param name="collection">Collection of shopping carts.</param>
/// <remarks>
/// Using the .Invoke() and .Merge() extension methods on a NamedCache
/// can give you the same result as .ForEach(), but with higher
/// GC overhead (more temporary Result objects are created).
/// </remarks>
static void RunDistributedAnalysisViaPMI(NamedCache cartCache)
{
string productName = "Acme Snow Globe"; // product to find in the carts
Result finalResult; // result of the computation
finalResult = cartCache.QueryObjects <ShoppingCart>()
.Invoke(
timeout: TimeSpan.FromMinutes(1),
param: productName,
evalMethod: (cart, pName) =>
{
var result = new Result();
result.numCarts = 1;
// see if the selected product is in the cart:
if (cart.Items.Any(item => item.Name.Equals(pName)))
{
result.numMatches++;
}
return(result);
})
.Merge(
(result1, result2) =>
{
result1.numMatches += result2.numMatches;
result1.numCarts += result2.numCarts;
return(result1);
});
float resultPct = (float)finalResult.numMatches / finalResult.numCarts * 100;
Console.WriteLine($"{resultPct:N1} percent of carts contain {productName}");
}
/// <summary>
/// Run shopping cart analysis on ScaleOut's distributed data grid,
/// only considering carts whose value is at least $20.
/// </summary>
/// <param name="collection">Collection of shopping carts.</param>
/// <remarks>
/// Filtering for with a LINQ .Where() call is performed in the ScaleOut service
/// when an object's property is marked with a [SossIndex] attribute
/// (like ShoppingCart.TotalValue, in this case). You can reduce deserialization
/// overhead during ForEach analysis by filtering as much as possible in the
/// storage engine.
/// </remarks>
static void RunDistributedAnalysisMin20(NamedCache cartCache)
{
string productName = "Acme Snow Globe"; // product to find in the carts
Result finalResult; // result of the computation
finalResult = cartCache.QueryObjects <ShoppingCart>()
.Where(cart => cart.TotalValue >= 20.00m) // filter out low-value carts in the server.
.ForEach(
productName, // parameter
() => new Result(), // result-initialization delegate
(cart, pName, result) => // body of analysis logic
{
// see if the selected product is in the cart:
if (cart.Items.Any(item => item.Name.Equals(pName)))
{
result.numMatches++;
}
result.numCarts++;
return(result);
},
(result1, result2) => // merge logic
{
result1.numMatches += result2.numMatches;
result1.numCarts += result2.numCarts;
return(result1);
});
float resultPct = (float)finalResult.numMatches / finalResult.numCarts * 100;
Console.WriteLine($"{resultPct:N1} percent of $20+ carts contain {productName}");
}