public static void ShortestJobFirstAlgorithmCheck()
{
using (var pool = new ConcurrentObjectPool <string>(3, new StringFactory().CreateString))
{
//check for reuse when rent/dispose happening
var rental = pool.Rent();
Equal("One", rental.Resource);
rental.Dispose();
rental = pool.Rent();
Equal("One", rental.Resource);
rental.Dispose();
rental = pool.Rent();
Equal("One", rental.Resource);
rental.Dispose();
rental = pool.Rent();
Equal("One", rental.Resource);
rental.Dispose();
//check for lazy initialization if several objects are in rent
rental = pool.Rent();
var rental2 = pool.Rent();
var rental3 = pool.Rent();
Equal("One", rental.Resource);
Equal("Two", rental2.Resource);
Equal("Three", rental3.Resource);
}
}
public static void LackOfFreeObjectsRR()
{
using (var pool = new ConcurrentObjectPool <string>(new[] { "One", "Two" }))
{
var rental1 = pool.Rent();
Equal("One", rental1.Resource);
var rental2 = pool.Rent();
Equal("Two", rental2.Resource);
var t = new Thread(() =>
{
var rental3 = pool.Rent();
Equal("Two", rental3.Resource);
rental3.Dispose();
})
{
IsBackground = true
};
t.Start();
Thread.Sleep(500);
//now t trying to rent a new object
Equal(1, pool.WaitCount);
rental2.Dispose(); //pass object to thread t
t.Join();
rental2 = pool.Rent();
Equal("Two", rental2.Resource);
rental1.Dispose();
rental2.Dispose();
}
}
public static void StarvationLoadTest()
{
using (var pool = new ConcurrentObjectPool <string>(3, new StringFactory().CreateString))
{
for (var i = 0; i < 500; i++)
{
ConcurrentObjectPool <string> .IRental rental1 = pool.Rent(), rental2 = pool.Rent(), rental3 = pool.Rent();
Equal("One", rental1.Resource);
Equal("Two", rental2.Resource);
Equal("Three", rental3.Resource);
rental3.Dispose();
rental2.Dispose();
rental1.Dispose();
}
}
}
public static void RoundRobinAlgorithmCheck()
{
using var pool = new ConcurrentObjectPool <string>(new[] { "One", "Two", "Three" });
var rental = pool.Rent();
Equal("One", rental.Resource);
rental.Dispose();
rental = pool.Rent();
Equal("Two", rental.Resource);
rental.Dispose();
rental = pool.Rent();
Equal("Three", rental.Resource);
rental.Dispose();
rental = pool.Rent();
Equal("One", rental.Resource);
rental.Dispose();
}
public static void StarvationCheck()
{
using (var pool = new ConcurrentObjectPool <string>(3, new StringFactory().CreateString))
{
ConcurrentObjectPool <string> .IRental rental1 = pool.Rent(), rental2 = pool.Rent(), rental3 = pool.Rent();
Equal("One", rental1.Resource);
Equal("Two", rental2.Resource);
Equal("Three", rental3.Resource);
rental3.Dispose();
rental2.Dispose();
rental1.Dispose();
//Use first two objects in the pool, third will be destroyed automatically
rental2 = pool.Rent();
rental2.Dispose();
rental1 = pool.Rent();
rental1.Dispose();
rental1 = pool.Rent();
rental2 = pool.Rent();
Throws <Exception>(pool.Rent);
}
}
