static IEnumerable <HostItem> GetUpdatedList(Source sourceData, IEnumerable <string> contents)
{
IDnsClient dnsClient = new Libs.Updater.Dns.DnsClient(_logger, IPAddress.Parse(sourceData.FirstDNS), IPAddress.Parse(sourceData.SecondDNS));
var concurrentBag = new ConcurrentBag <HostItem>();
var tasks = new ConcurrentBag <Task>();
var details = contents.Select(line =>
{
var arr = line.Split(new char[0], StringSplitOptions.RemoveEmptyEntries);
return(new HostItem {
HostName = arr[1], IPAddress = IPAddress.Parse(arr[0])
});
});
// Create and add a task for each of the lines.
// Update the IP address for each hostnames. If failed, its default value will be used as output.
Parallel.ForEach(details, item =>
{
tasks.Add(Task.Run(async() =>
{
var newItem = new HostItem {
HostName = item.HostName
};
var ipAddress = await dnsClient.ResolveHostNameAsync(item.HostName);
if (ipAddress != null)
{
if (!ipAddress.Equals(item.IPAddress))
{
newItem.IPAddress = ipAddress;
newItem.Status = "updated";
}
else
{
// Same value, so just use its default value.
newItem.IPAddress = item.IPAddress;
}
}
else
{
// Failed to resolve, so use its default IP address.
newItem.IPAddress = item.IPAddress;
newItem.Status = "not found";
}
concurrentBag.Add(newItem);
}));
});
Task.WaitAll(tasks.ToArray());
return(concurrentBag);
}
private IEnumerable <HostItem> GetUpdatedList(Source sourceData, IEnumerable <string> contents)
{
IDnsClient dnsClient = new Libs.Updater.Dns.DnsClient(_logger, IPAddress.Parse(sourceData.FirstDNS), IPAddress.Parse(sourceData.SecondDNS));
var concurrentBag = new ConcurrentBag <HostItem>();
var details = contents.Select(line =>
{
var arr = line.Split(new char[0], StringSplitOptions.RemoveEmptyEntries);
return(new HostItem {
HostName = arr[1], IPAddress = IPAddress.Parse(arr[0])
});
});
// Create and add a task for each of the lines.
// Update the IP address for each hostnames. If failed, its default value will be used as output.
Parallel.ForEach(details, item =>
{
// Initialize with default values.
var newItem = new HostItem {
HostName = item.HostName, IPAddress = item.IPAddress
};
IPAddress ipAddress = null;
try
{
ipAddress = dnsClient.ResolveHostName(item.HostName);
if (ipAddress != null)
{
// Value not same, so update it.
if (!ipAddress.Equals(item.IPAddress))
{
newItem.IPAddress = ipAddress;
newItem.Status = "updated";
}
}
else
{
// Failed to resolve, so use its default IP address.
newItem.Status = "not found";
}
}
catch (Exception ex)
{
_logger.LogException(ex);
newItem.Status = ex.Message;
}
concurrentBag.Add(newItem);
});
return(concurrentBag);
}
