void GenerateBigFile(IConfiguration config)
{
var random = new Random();
using (var system = new FarmSystem(config))
{
Cow[] cows = new Cow[_totalCows];
for (int i = 0; i < _totalCows; ++i)
{
cows[i] = new Cow {
Code = "Cow " + i
};
system.Track(cows[i]);
}
int days = 0;
foreach (DateTime day in (DateTime.Now - TimeSpan.FromDays(_totalDays)).DaysUntil(DateTime.Now))
{
Console.Write("{0} ", ++days);
foreach (Cow cow in cows)
{
system.Milked(cow, day, (float)(2 * random.NextDouble()));
system.Milked(cow, day.AddHours(8), (float)(2 * random.NextDouble()));
system.Milked(cow, day.AddHours(8), (float)(2 * random.NextDouble()));
system.CustomEvent(cow, day, EventIds[random.Next(EventIds.Length)]);
}
}
Console.WriteLine();
}
}
private void RunBenchmarks(IConfiguration config)
{
using (var system = new FarmSystem(config))
{
var cow1 = RandomCow(system);
var cow2 = RandomCow(system);
var code = RandomCowCode();
Benchmark("select a single cow",
() => from c in system.Cows where c.Code == code select new { c.Code },
() => from c in new[] { system.OptimizedSingleCow(code) } select new { c.Code });
// “find all cows whose average milk during august was less than 0.75 of the herd’s average.”
var august = new DateTime(2007, 8, 1);
var september = august.AddMonths(1);
Benchmark("find all cows whose average milk during august was less than 0.75 of the herd’s average.", () =>
{
var herdAverage = system.HerdAverage(august, september);
var threshold = .90 * herdAverage;
return(from c in system.Cows
let CowAverage = system.CowAverage(c, august, september)
where CowAverage < threshold
select new { c.Code, CowAverage });
}, () =>
{
var herdAverage = system.OptimizedHerdAverage(august, september);
var threshold = .90 * herdAverage;
return(from c in system.Cows
let CowAverage = system.OptimizedCowAverage(c, august, september)
where CowAverage < threshold
select new { c.Code, CowAverage });
});
// The example queries:
// A. For each cow, calculate total milk between date1 and date2
Benchmark("For each cow, calculate total milk between date1 and date2",
() => from c in system.Cows
let CowTotal = system.CowTotal(c, august, september)
select new { c.Code, CowTotal },
() => from c in system.Cows
let CowTotal = system.OptimizedCowTotal(c, august, september)
select new { c.Code, CowTotal });
// B. Find cows whose total(date1,date2) < X
Benchmark("Find cows whose total(date1,date2) < X",
() => from c in system.Cows
let CowTotal = system.CowTotal(c, august, september)
where CowTotal < 2
select new { c.Code, CowTotal },
() => from c in system.Cows
let CowTotal = system.OptimizedCowTotal(c, august, september)
where CowTotal < 2
select new { c.Code, CowTotal });
// C. Find cows whose total(date1,date2) < 0.75 * average total(date1,date2)
// D. Days from last give_birth event for cows who are in active milking
// [these are cows that have a "give_birth" event and no "drying" event
// after it]
Benchmark("Days in active milking",
() => from c in system.Cows
let LastGaveBirth = system.DateOfLastEvent(c, "give_birth")
let LastDrying = system.DateOfLastEvent(c, "drying")
where LastDrying == null || LastGaveBirth > LastDrying
select new { c.Code, (DateTime.Now - LastGaveBirth.Value).TotalDays },
() => from c in system.OptimizedCowsThatEverGaveBirth()
let LastGaveBirth = system.OptimizedDateOfLastEvent(c, "give_birth")
let LastDrying = system.OptimizedDateOfLastEvent(c, "drying")
where LastDrying == null || LastGaveBirth > LastDrying
select new { c.Code, (DateTime.Now - LastGaveBirth.Value).TotalDays });
// E. How many cows gave birth in each month during the last year
var lastYear = new DateTime(2007, 1, 1);
var lastYearEnd = lastYear.AddYears(1);
Benchmark("How many cows gave birth in each month",
() => from e in system.Events
where e.Id == "give_birth" && e.Date >= lastYear && e.Date <= lastYearEnd
group e.Cow by e.Date.Month into g
select new
{
Month = g.Key,
Count = g.Distinct().Count()
},
() => from CustomCowEvent e in system.OptimizedEventRange("give_birth", lastYear, lastYearEnd)
group e.Cow by e.Date.Month into g
select new
{
Month = g.Key,
Count = g.Distinct().Count()
});
}
}
private Cow RandomCow(FarmSystem system)
{
var code = RandomCowCode();
return((from c in system.Cows where c.Code == code select c).First());
}