/// <summary>
/// Default constructor.
/// </summary>
public ServiceMailer()
{
// get the path to the directory for queuing messages
if (queueDir == null) {
queueDir = HttpContext.Current.Server.MapPath("/") + ConfigurationSettings.AppSettings[CONFIG_QUEUE_DIR];
}
// get the path to the directory for failed queue messages
if (failedDir == null) {
failedDir = HttpContext.Current.Server.MapPath("/") + ConfigurationSettings.AppSettings[CONFIG_QUEUE_FAILED_DIR];
}
// get the time interval for checking the queue -- value
// in config file is minutes, so convert to milliseconds
if (queueCheckTime == 0) {
try {
queueCheckTime = int.Parse(ConfigurationSettings.AppSettings[CONFIG_QUEUE_CHECK_TIME]);
//* 60 * 1000;
} catch (Exception e) {
LogManager.GetCurrentClassLogger().Error(
errorMessage => errorMessage("Parse of queueCheckTime failed."), e);
}
}
// set up the FileQueue for queuing failed requests
if (queue == null) {
queue = new FileQueue(queueDir,
queueCheckTime,
this.ProcessQueueEntry);
try {
queue.MaxAttempts = int.Parse(ConfigurationSettings.AppSettings[CONFIG_MAX_ATTEMPTS]);
} catch (Exception e) {
queue.MaxAttempts = 0;
}
queue.MaxAttemptsHandler = this.MaxedOutQueueEntry;
}
}
/// <summary>
/// Checks the queue directory for any entries and if there are entries attempts
/// to process them. This is the method called by the <c>Timer</c> to
/// periodically process the queue.
/// </summary>
/// <param name="stateInfo">The <c>QueueInfo</c> containing the state
/// information of the <c>FileQueue</c> from which the Timer that
/// is calling this method originated.</param>
private static void CheckQueue(
Object stateInfo)
{
QueueInfo queueInfo = (QueueInfo)stateInfo;
FileQueue fileQueue = new FileQueue(queueInfo);
bool hadError = false;
LogManager.GetCurrentClassLogger().Info(
infoMessage => infoMessage("===== Checking Queue ====="));
DirectoryInfo dirInfo = new DirectoryInfo(queueInfo.queueLocation);
// get the list of files in the queue directory
FileInfo[] files = dirInfo.GetFiles("*.txt");
// for each queued file...
foreach (FileInfo info in files) {
try {
StreamReader reader = info.OpenText();
FileQueueEntry entry = new FileQueueEntry();
entry.SetFileName(info.Name);
int keyLineCnt = 0;
// continue while there is more stuff in the file
while (reader.Peek() >= 0) {
try {
// read the next line of the file
String line = reader.ReadLine();
// find the position of the key/value delimiter
int delimPos = line.IndexOf(FileQueueEntry.QUEUE_FILE_DELIMITER);
String key = line.Substring(0, delimPos);
String val = line.Substring(delimPos + FileQueueEntry.QUEUE_FILE_DELIMITER.Length);
// set the attributes of the queue entry from the
// queued file
if (key == FileQueueEntry.Q_LABEL_QUEUE_TIME) {
entry.SetQueuedTime(DateTime.Parse(val));
keyLineCnt++;
} else if (key == FileQueueEntry.Q_LABEL_ATTEMPT_CNT) {
entry.SetAttempts(int.Parse(val));
keyLineCnt++;
} else if (key == FileQueueEntry.Q_LABEL_LAST_TIME) {
entry.SetLastAttemptTime(DateTime.Parse(val));
keyLineCnt++;
} else {
entry[key] = val;
}
} catch (Exception e) {
hadError = true;
LogManager.GetCurrentClassLogger().Error(
errorMessage => errorMessage("FileQueue.CheckQueue 1: "), e);
}
}
reader.Close();
bool processed = false;
// if the entry was successfully processed, removed it
// from the queue
try {
if (!hadError && queueInfo.processingMethod(entry)) {
fileQueue.Dequeue(entry);
processed = true;
}
} catch (Exception e) {
LogManager.GetCurrentClassLogger().Error(
errorMessage => errorMessage("Error processing queue entry: "), e);
}
// if the entry was not successfully processed, first
// see if we have reached the max # of attempts and it
// so, call the MaxAttemptsHandler, otherwise update
// the entry info
// also, make sure we at least read the key
// lines required to maintain the queue entry (beyond 3
// is application data)
if (!processed && (keyLineCnt >= 3)) {
entry.SetAttempts(entry.Attempts + 1);
entry.SetLastAttemptTime(DateTime.Now);
fileQueue.WriteQueueEntry(entry);
// if there is a max attempts set and we've reached it
// call the handler method (if one is defined) for max attempts
// and remove the entry from the queue
if ((queueInfo.maxAttempts > 0) && (entry.Attempts >= queueInfo.maxAttempts)) {
if (queueInfo.maxAttemptsMethod != null) {
queueInfo.maxAttemptsMethod(entry);
}
fileQueue.Dequeue(entry);
}
}
} catch (Exception e) {
LogManager.GetCurrentClassLogger().Error(
errorMessage => errorMessage("FileQueue.CheckQueue 2: "), e);
}
}
LogManager.GetCurrentClassLogger().Info(
infoMessage => infoMessage("===== End Queue Check ====="));
}
