/// <inheritdoc />
public async Task ReleaseLockAsync(LockToken token)
{
var table = await GetTableAsync();
var doc = new Document
{
[ColumnNames.HolderId] = token.HolderId,
[ColumnNames.ResourceId] = token.ResourceId,
[ColumnNames.LeaseExpiry] = token.LeaseExpiry.ToString("O")
};
await table.DeleteItemAsync(doc);
}
/// <inheritdoc />
public async Task <LockToken?> RenewAsync(
LockToken token,
TimeSpan duration)
{
var table = await GetTableAsync();
var doc = new Document
{
[ColumnNames.HolderId] = token.HolderId,
[ColumnNames.ResourceId] = token.ResourceId
};
var expiry = DateTimeOffset.UtcNow.Add(duration);
doc[ColumnNames.LeaseExpiry] = expiry.ToString("O");
var expr = new Expression
{
ExpressionStatement = $"{ColumnNames.ResourceId} = :ID OR {ColumnNames.LeaseExpiry} < :NOW",
ExpressionAttributeValues =
{
[":NOW"] = DateTimeOffset.UtcNow.ToString("O"),
[":ID"] = token.ResourceId
}
};
try
{
await table.PutItemAsync(doc, new PutItemOperationConfig
{
ConditionalExpression = expr
});
return(token.WithNewExpiry(expiry));
}
catch (ConditionalCheckFailedException)
{
return(null);
}
}