/// <summary>
/// Attempts to acquire a proscribed quantity of a resource in this resource pool. If the
/// resource has already been reserved under this resourceRequest, it simply acquires that
/// resource. If no resource has been reserved, then the best available resource will be
/// reserved, and then acquired.
/// </summary>
/// <param name="resourceRequest">The resource request under which the reservation is to take
/// place, and describing the resources desired.</param>
/// <param name="blockAwaitingAcquisition">If true, blocks until resource is acquired.</param>
/// <returns>true if the acquisition was successful.</returns>
public bool Acquire(IResourceRequest resourceRequest, bool blockAwaitingAcquisition)
{
if (s_diagnostics)
{
_Debug.WriteLine(Name + " servicing request to acquire (" + (blockAwaitingAcquisition?"with":"without") + " block) " + resourceRequest.QuantityDesired + " units of " + resourceRequest);
}
if (resourceRequest.RequiredResource != null)
{
_Debug.Assert(false, "Explicit targeting of resources not yet implemented.");
// TODO: Explicit targeting of resources and keying of requests not yet implemented.
}
if (blockAwaitingAcquisition)
{
bool acquired = AcquireWithWait(resourceRequest);
return(acquired);
}
bool ableToReserve = ReserveBestResource(resourceRequest);
if (ableToReserve)
{
lock (resourceRequest.ResourceObtained) {
IResource rsc = resourceRequest.ResourceObtained;
rsc.Acquire(resourceRequest);
resourceRequest.ResourceObtainedFrom = this;
ResourceAcquired?.Invoke(resourceRequest, resourceRequest.ResourceObtained);
}
}
return(ableToReserve);
}
public void SetInServiceTracked()
{
IResource resource = Resource.Create(Names);
Simulation sim = new Simulation();
resource.OutOfService = resource.Count;
Task[] tasks = new Task[resource.Count + 1];
for (int i = 0; i < resource.Count; i++)
{
Task nop = new NoOperation(sim);
tasks[i] = resource.Acquire(nop);
nop.WaitOnTask(tasks[i]);
}
tasks[tasks.Length - 1] = new Process(sim, SetInService, resource);
sim.Run(tasks);
Assert.AreEqual(Names.Length, resource.InUse);
}
public void SetOutOfServiceAnonymous()
{
IResource resource = Resource.Create(7);
Simulation sim = new Simulation();
resource.OutOfService = 2;
Task[] tasks = new Task[resource.Count];
for (int i = 0; i < resource.Count; i++)
{
Task nop = new NoOperation(sim);
tasks[i] = resource.Acquire(nop);
nop.WaitOnTask(tasks[i]);
}
sim.Run(tasks);
Assert.AreEqual(resource.Count - resource.OutOfService,
resource.InUse);
}
private IEnumerator <Task> AcquireOneInterrupted(Process p, object data)
{
IResource r = (IResource)data;
Task t = new InterruptTask(p.Simulation);
p.WaitOnTask(t, t.Priority + 10);
Assert.AreEqual(1, t.BlockCount);
yield return(r.Acquire(p));
// The InterruptTask should interrupt us here.
Assert.IsTrue(p.Interrupted);
yield return(p.Delay(3));
// After a delay, the interrupt flag should be cleared.
Assert.IsTrue(!p.Interrupted);
yield break;
}
public ResourceGuard(IResource resource)
{
_resource = resource;
_resource.Acquire();
}