public async Task <bool> Reserve(string value, string scope, string ownerToken, TimeSpan?lease = null)
{
if (value == null)
{
throw new ArgumentNullException("value");
}
if (scope == null)
{
throw new ArgumentNullException("scope");
}
if (ownerToken == null)
{
throw new ArgumentNullException("ownerToken");
}
var now = Clock.Now();
var expiration = now + (lease ?? TimeSpan.FromMinutes(1));
var key = Tuple.Create(value, scope);
ReservedValue reservedValueInDictionary;
reservedValues.TryGetValue(key, out reservedValueInDictionary);
// Make sure to create a new object. Don't use the object from Dictionary directly.
var reservedValue = reservedValueInDictionary == null ? null : reservedValueInDictionary.Clone();
if (reservedValue == null)
{
// if not, create a new ticket
reservedValue = new ReservedValue
{
OwnerToken = ownerToken,
Scope = scope,
Value = value,
Expiration = expiration,
ConfirmationToken = value
};
return(reservedValues.TryAdd(key, reservedValue));
}
else if (reservedValue.Expiration == null)
{
return(reservedValue.OwnerToken == ownerToken);
}
else if (reservedValue.OwnerToken == ownerToken)
{
// if it's the same, extend the lease
var newReservedValue = reservedValue.Clone();
newReservedValue.Expiration = expiration;
return(reservedValues.TryUpdate(key, newReservedValue, reservedValue));
}
else if (reservedValue.Expiration < now)
{
// take ownership if the reserved value has expired
var newReservedValue = reservedValue.Clone();
newReservedValue.OwnerToken = ownerToken;
newReservedValue.Expiration = expiration;
return(reservedValues.TryUpdate(key, newReservedValue, reservedValue));
}
return(false);
}
public async Task<bool> Reserve(string value, string scope, string ownerToken, TimeSpan? lease = null)
{
if (value == null)
{
throw new ArgumentNullException("value");
}
if (scope == null)
{
throw new ArgumentNullException("scope");
}
if (ownerToken == null)
{
throw new ArgumentNullException("ownerToken");
}
var now = Clock.Now();
var expiration = now + (lease ?? TimeSpan.FromMinutes(1));
var key = Tuple.Create(value, scope);
ReservedValue reservedValueInDictionary;
reservedValues.TryGetValue(key, out reservedValueInDictionary);
// Make sure to create a new object. Don't use the object from Dictionary directly.
var reservedValue = reservedValueInDictionary == null ? null : reservedValueInDictionary.Clone();
if (reservedValue == null)
{
// if not, create a new ticket
reservedValue = new ReservedValue
{
OwnerToken = ownerToken,
Scope = scope,
Value = value,
Expiration = expiration,
ConfirmationToken = value
};
return reservedValues.TryAdd(key, reservedValue);
}
else if (reservedValue.Expiration == null)
{
return reservedValue.OwnerToken == ownerToken;
}
else if (reservedValue.OwnerToken == ownerToken)
{
// if it's the same, extend the lease
var newReservedValue = reservedValue.Clone();
newReservedValue.Expiration = expiration;
return reservedValues.TryUpdate(key, newReservedValue, reservedValue);
}
else if (reservedValue.Expiration < now)
{
// take ownership if the reserved value has expired
var newReservedValue = reservedValue.Clone();
newReservedValue.OwnerToken = ownerToken;
newReservedValue.Expiration = expiration;
return reservedValues.TryUpdate(key, newReservedValue, reservedValue);
}
return false;
}
void Initialize()
{
if (initialized)
{
return;
}
initialized = true;
var min = Mathf.RoundToInt(range.x);
var max = Mathf.RoundToInt(range.y);
var length = max - min;
values = new ReservedValue[length];
for (int i = 0; i < length; i++)
{
values[i] = new ReservedValue(i + min);
}
}
public async Task<bool> Reserve(string value, string scope, string ownerToken, TimeSpan? lease = null)
{
if (value == null)
{
throw new ArgumentNullException(nameof(value));
}
if (scope == null)
{
throw new ArgumentNullException(nameof(scope));
}
if (ownerToken == null)
{
throw new ArgumentNullException(nameof(ownerToken));
}
var now = Clock.Now();
using (var db = CreateReservationServiceDbContext())
{
var reservedValues = db.Set<ReservedValue>();
var expiration = now + (lease ?? TimeSpan.FromMinutes(1));
// see if there is a pre-existing lease by the same actor
var reservedValue = reservedValues.SingleOrDefault(r => r.Scope == scope &&
r.Value == value);
if (reservedValue == null)
{
// if not, create a new ticket
reservedValue = new ReservedValue
{
OwnerToken = ownerToken,
Scope = scope,
Value = value,
Expiration = expiration,
ConfirmationToken = value
};
reservedValues.Add(reservedValue);
}
else if (reservedValue.Expiration == null)
{
return reservedValue.OwnerToken == ownerToken;
}
else if (reservedValue.OwnerToken == ownerToken)
{
// if it's the same, extend the lease
reservedValue.Expiration = expiration;
}
else if (reservedValue.Expiration < now)
{
// take ownership if the reserved value has expired
reservedValue.OwnerToken = ownerToken;
reservedValue.Expiration = expiration;
}
else
{
return false;
}
try
{
await db.SaveChangesAsync();
return true;
}
catch (Exception exception)
{
if (!exception.IsConcurrencyException())
{
throw;
}
}
return false;
}
}
