private MemberDb memberDb = null; //this is the database
public MemberCache(MemberDb theDb)
{
if (theDb == null)
{
throw new ArgumentException();
}
this.memberDb = theDb;
}
// add some initial data.
private static void InitDatabase(MemberDb memberDb)
{
memberDb.AddMember(new Member("Mia"));
memberDb.AddMember(new Member("Vincent"));
memberDb.AddMember(new Member("Jules"));
memberDb.AddMember(new Member("Marsellus"));
memberDb.AddMember(new Member("Winston"));
memberDb.AddMember(new Member("Butch"));
memberDb.AddMember(new Member("Jimmie"));
memberDb.AddMember(new Member("Honey"));
memberDb.AddMember(new Member("Pumpkin"));
memberDb.AddMember(new Member("Koons"));
}
public static void AddNewMemberTask(MemberDb memberDb, List <Member> newMembers,
int timespan, int interval)
{
int run = 0;
int elapsed = 0;
while (elapsed < timespan && run < newMembers.Count)
{
memberDb.AddMember(newMembers[run]);
run++;
Thread.Sleep(interval);
elapsed = elapsed + interval;
}
}
public static void DeleteMemberTask(MemberDb memberDb, int timespan, int
interval, int minId, int maxId)
{
int elapsed = 0;
Random rand = new Random();
int memberId = 0;
while (elapsed < timespan)
{
memberId = rand.Next(minId, maxId); //Note, Id may not be valid
memberDb.RemoveMember(memberId);
Thread.Sleep(interval);
elapsed = elapsed + interval;
}
}
static void Main(string[] args)
{
Console.WriteLine("Testing simple cache ...");
MemberDb memberDb = new MemberDb();
InitDatabase(memberDb);
MemberCache memberCache = new MemberCache(memberDb);
List <Task> tasks = new List <Task>();
//Start a task to add new members. Adds a new member every .5 secons for 5 secons
Task task = new Task(() => AddNewMemberTask(memberDb, GetNewMemberList(), 5000, 500));
task.Start();
tasks.Add(task);
//Start a task to delete random members. Deletes a member with id betwween
//5-20 every .5 seconds for 5 seconds. Note: some id's may not be valid.
task = new Task(() => DeleteMemberTask(memberDb, 5000, 500, 6, 15));
task.Start();
tasks.Add(task);
//Create 2 tasks that read random ids between 1-7 every 250 ms for 5 seconds.
task = new Task(() => CacheReader(memberCache, 5000, 250, 8));
task.Start();
tasks.Add(task);
task = new Task(() => CacheReader(memberCache, 5000, 250, 8));
task.Start();
tasks.Add(task);
//Create a task that read random ids between 1-20 every 250 ms for 5 seconds.
//Note some requested Ids may not be valid
task = new Task(() => CacheReader(memberCache, 5000, 250, 20));
task.Start();
tasks.Add(task);
Task.WaitAll(tasks.ToArray());
memberCache.PrintCache();
memberDb.PrintDb();
}
