/// <summary>
/// Get the first RequestRecord in the queue
/// </summary>
public static RequestRecord GetRequestRecord(string queueName)
{
List <RequestRecord> requests = new List <RequestRecord>();
DataContractJsonSerializer dc = new DataContractJsonSerializer(requests.GetType());
using (IsolatedStorageFile file = IsolatedStorageFile.GetUserStoreForApplication())
{
lock (fileLocks[queueName])
{
// try block because the using block below will throw if the file doesn't exist
try
{
// if the file opens, read the contents
using (IsolatedStorageFileStream stream = new IsolatedStorageFileStream(QueueFilename(queueName), FileMode.Open, file))
{
try
{
// if the file opens, read the contents
requests = dc.ReadObject(stream) as List <RequestRecord>;
if (requests.Count > 0)
{
RequestRecord record = requests[0];
record.DeserializeBody();
return(record);
}
else
{
return(null);
}
}
catch (Exception ex)
{
stream.Position = 0;
string s = new StreamReader(stream).ReadToEnd();
TraceHelper.AddMessage(String.Format("Exception in deserializing RequestRecord: {0}; record: {1}", ex.Message, s));
return(null);
}
}
}
catch (Exception)
{
// could not open the isolated storage file
return(null);
}
}
}
}
/// <summary>
/// Dequeue the first record
/// </summary>
public static RequestRecord DequeueRequestRecord(string queueName)
{
List <RequestRecord> requests = new List <RequestRecord>();
DataContractJsonSerializer dc = new DataContractJsonSerializer(requests.GetType());
using (IsolatedStorageFile file = IsolatedStorageFile.GetUserStoreForApplication())
{
lock (fileLocks[queueName])
{
using (IsolatedStorageFileStream stream = new IsolatedStorageFileStream(QueueFilename(queueName), FileMode.Open, file))
{
try
{
// if the file opens, read the contents
requests = dc.ReadObject(stream) as List <RequestRecord>;
if (requests.Count > 0)
{
RequestRecord record = requests[0];
requests.Remove(record); // remove the first entry
stream.SetLength(0);
stream.Position = 0;
dc.WriteObject(stream, requests);
record.DeserializeBody();
return(record);
}
else
{
return(null);
}
}
catch (Exception ex)
{
stream.Position = 0;
string s = new StreamReader(stream).ReadToEnd();
TraceHelper.AddMessage(String.Format("Exception in deserializing RequestRecord: {0}; record: {1}", ex.Message, s));
return(null);
}
}
}
}
}