static void Ex11()
{
//in our scenario we have a Bank that
//can Transfer an amount from a source BankAccount
//to a target BankAccount.
//if we do not use multithreading,
//no problems will arise
ExampleLibrary.BankScenario.BankAccount ba1 = new ExampleLibrary.BankScenario.BankAccount()
{
Id = 1
};
ExampleLibrary.BankScenario.BankAccount ba2 = new ExampleLibrary.BankScenario.BankAccount()
{
Id = 2
};
ba1.Deposit(100);
ExampleLibrary.BankScenario.NotSynchronized.Bank bank = new ExampleLibrary.BankScenario.NotSynchronized.Bank();
for (int i = 0; i < 100; i++) //200 transfer
{
bank.Transfer(ba1, ba2, 50);
bank.Transfer(ba2, ba1, 50);
}
Console.WriteLine($"{ba1.Id} == {ba1.Saldo}\t{ba2.Id} == {ba2.Saldo}"); //ba1.Saldo == 100, ba2.Saldo == 0
}
static void Ex12()
{
//same Bank that
//can Transfer an amount from a source BankAccount
//to a target BankAccount.
//if multiple threads try to transfer from the same
//accounts, concurrency problems could arise....
ExampleLibrary.BankScenario.BankAccount ba1 = new ExampleLibrary.BankScenario.BankAccount()
{
Id = 1
};
ExampleLibrary.BankScenario.BankAccount ba2 = new ExampleLibrary.BankScenario.BankAccount()
{
Id = 2
};
ba1.Deposit(100);
ExampleLibrary.BankScenario.NotSynchronized.Bank bank = new ExampleLibrary.BankScenario.NotSynchronized.Bank();
for (int i = 0; i < 100; i++) //200 concurrent Threads running transfer
{
new Thread(() => {
bank.Transfer(ba1, ba2, 50);
Console.WriteLine($"{ba1.Id} == {ba1.Saldo}\t{ba2.Id} == {ba2.Saldo}");
}).Start();
new Thread(() => {
bank.Transfer(ba2, ba1, 50);
Console.WriteLine($"{ba1.Id} == {ba1.Saldo}\t{ba2.Id} == {ba2.Saldo}");
}).Start();
}
//we could see weird numbers popping up....
}
