public class StackScheduler : IScheduler
{
protected Stack <Task> _stack;
public StackScheduler ()
{
_stack = new Stack< Task>();
}
public void Add( Task t )
{
if (!Contains (t))
{
_stack.Push (t);
}
}
public void Remove( Task t )
{
_stack.Pop ();
}
public bool Contains( Task t )
{
bool found = false;
foreach (var task in _stack )
{
if (t .AsyncState != null && t .AsyncState. Equals(task .AsyncState))
{
found = true ;
break;
}
}
return found ;
}
public bool Contains( Task t , EqualityComparer< Task> comp )
{
throw new NotImplementedException();
}
public IEnumerator <Task> GetEnumerator()
{
return new SchedulerEnumerator( this);
}
IEnumerator IEnumerable .GetEnumerator()
{
return new SchedulerEnumerator( this);
}
public int Count
{
get { return _stack. Count; }
}
public Task this[ int index]
{
get { return (Task) _stack.ToArray ()[index];
}
set { _stack .ToArray()[index]
= value;
}
}
}
public
class DynamicQueueScheduler : IScheduler
{
protected List <Task> _queue;
public DynamicQueueScheduler
()
{
_queue = new List< Task>();
}
public virtual void Add(Task t)
{
Task oldTask = null;
if (Contains (t, out oldTask ))
{
_queue.Remove (oldTask);
}
_queue.Add (t);
}
public virtual void Remove(Task t)
{
_queue.Remove (t);
}
public virtual bool Contains(Task t)
{
Task oldTask = null;
bool found = Contains( t, out oldTask);
return found ;
}
public virtual bool Contains(Task t, out Task oldTask)
{
bool found = false;
oldTask = null ;
foreach (var task in _queue )
{
if (t .AsyncState != null && t .AsyncState. Equals(task .AsyncState))
{
oldTask = task ;
found = true ;
break;
}
}
return found ;
}
public virtual bool Contains(Task t, EqualityComparer<Task > comp)
{
throw new NotImplementedException();
}
public IEnumerator <Task> GetEnumerator()
{
return new SchedulerEnumerator( this);
}
IEnumerator IEnumerable .GetEnumerator()
{
return new SchedulerEnumerator( this);
}
public int Count
{
get { return _queue. Count; }
}
public Task this[ int index]
{
get { return (Task) _queue[index]; }
set { _queue [index] = value; }
}
}
4.Dynamic LIFO
public class DynamicStackScheduler : IScheduler
{
protected List <Task> _queue;
public DynamicStackScheduler
()
{
_queue = new List< Task>();
}
public void Add( Task t )
{
Task oldTask = null;
if (Contains (t, out oldTask ))
{
_queue.Remove (oldTask);
}
_queue.Insert (0,t);
}
public void Remove( Task t )
{
_queue.Remove (t);
}
public bool Contains( Task t )
{
Task oldTask = null;
bool found = Contains( t, out oldTask);
return found ;
}
public bool Contains( Task t , out Task oldTask )
{
bool found = false;
oldTask = null ;
foreach (var task in _queue )
{
if (t .AsyncState != null && t .AsyncState. Equals(task .AsyncState))
{
oldTask = task ;
found = true ;
break;
}
}
return found ;
}
public bool Contains( Task t , EqualityComparer< Task> comp )
{
throw new NotImplementedException();
}
public IEnumerator <Task> GetEnumerator()
{
return new SchedulerEnumerator( this);
}
IEnumerator IEnumerable .GetEnumerator()
{
return new SchedulerEnumerator( this);
}
public int Count
{
get { return _queue. Count; }
}
public Task this[ int index]
{
get { return (Task) _queue[index]; }
set { _queue [index] = value; }
}
}
测试代码
class Program
{
static Queue <int> _queue = new Queue< int>();
//static TaskFactory _factory = new TaskFactory(new
TaskSchedulerBase<QueueScheduler>());
//static TaskFactory _factory = new TaskFactory(new
TaskSchedulerBase<StackScheduler>());
//static TaskFactory _factory = new TaskFactory(new
TaskSchedulerBase<DynamicQueueScheduler>());
//static TaskFactory _factory = new TaskFactory(new
TaskSchedulerBase<DynamicStackScheduler>());
static TaskFactory _factory = new TaskFactory (new TaskSchedulerBase<DynamicQueueScheduler >());
static void Main( string[] args )
{
var thread1 = new Thread(Producer );
var thread2 = new Thread(Consumer );
thread1.Start ();
thread2.Start ();
Console.ReadKey
();
}
static void Producer()
{
for (int i = 0; i < 7; i ++)
{
_queue.Enqueue (i);
}
_queue.Enqueue (3);
_queue.Enqueue (2);
}
static void Consumer()
{
while (true )
{
if (_queue .Count >
0)
{
foreach (var i in _queue )
{
_factory.StartNew
((s)
=>
{
Console.Write ("{0} on thread {1} {2}\n", s, Thread.CurrentThread .ManagedThreadId,
DateTime.Now .ToLongTimeString());
}, i);
}
_queue.Clear ();
}
else
{
Thread.Sleep (1);
}
}
}
}