public async Task PersistHandledMessage(InboxRecord inboxMessage)
{
const string sql = @"MERGE INTO [{0}].[{1}InboxRecord] WITH (updlock, rowlock) AS tgt
USING
(SELECT @ContentId, @CheckMessageOrderType) AS src (ContentId, CheckMessageOrderType)
ON tgt.ContentId = src.ContentId and tgt.CheckMessageOrderType = src.CheckMessageOrderType
WHEN MATCHED THEN
UPDATE
SET
ContentVersion = @ContentVersion,
ContentId = @ContentId,
ModifiedAtUtc = @ModifiedAtUtc,
MessageId = @MessageId
WHEN NOT MATCHED THEN
INSERT (ContentId, ContentVersion, CheckMessageOrderType, ModifiedAtUtc, MessageId)
VALUES (@ContentId, @ContentVersion, @CheckMessageOrderType, @ModifiedAtUtc, @MessageId);";
object[] parameters = { dbSchemaName, dbTablePrefix };
await this.Database.ExecuteSqlCommandAsync(
string.Format(sql, parameters),
new SqlParameter("@ContentId", inboxMessage.ContentId),
new SqlParameter("@ContentVersion", inboxMessage.ContentVersion),
new SqlParameter("@CheckMessageOrderType", inboxMessage.CheckMessageOrderType),
new SqlParameter("@ModifiedAtUtc", inboxMessage.ModifiedAtUtc),
new SqlParameter("@MessageId", inboxMessage.MessageId))
.ConfigureAwait(false);
}
public async Task PersistDiscardedMessage(InboxRecord inboxMessage, long latestHandledVersion)
{
//Add or update
const string sql = @"INSERT INTO [{0}].[{1}InboxRecordDiscarded] (ContentId, ContentVersion, LatestContentVersion, CheckMessageOrderType, ModifiedAtUtc, MessageId)
VALUES (@ContentId, @ContentVersion, @LatestContentVersion, @CheckMessageOrderType, @ModifiedAtUtc, @MessageId)" ;
object[] parameters = { dbSchemaName, dbTablePrefix };
await this.Database.ExecuteSqlCommandAsync(
string.Format(sql, parameters),
new SqlParameter("@ContentId", inboxMessage.ContentId),
new SqlParameter("@ContentVersion", inboxMessage.ContentVersion),
new SqlParameter("@LatestContentVersion", latestHandledVersion),
new SqlParameter("@CheckMessageOrderType", inboxMessage.CheckMessageOrderType),
new SqlParameter("@ModifiedAtUtc", inboxMessage.ModifiedAtUtc),
new SqlParameter("@MessageId", inboxMessage.MessageId))
.ConfigureAwait(false);
}
public override async Task Invoke(IInvokeHandlerContext context, Func <Task> next)
{
var session = context.SynchronizedStorageSession;
var sqlPersistenceSession = session.SqlPersistenceSession();
var dbContext = (InboxDbContext)Activator.CreateInstance(typeof(InboxDbContext), sqlPersistenceSession.Connection);
using (dbContext)
{
dbContext.Database.UseTransaction(sqlPersistenceSession.Transaction);
context.MessageHeaders.TryGetValue("ContentId", out string contentId);
long contentVersion = GetContentVersionFrom(context.MessageHeaders);
var checkMessageOrderType = GetCheckMessageOrderType(context);
var latestHandledVersion = await dbContext.GetLatestMessageVersion(contentId, checkMessageOrderType).ConfigureAwait(false);
var shouldBeHandled = latestHandledVersion == null || contentVersion > latestHandledVersion;
var inboxMessage = new InboxRecord
{
ContentId = contentId,
ContentVersion = contentVersion,
CheckMessageOrderType = checkMessageOrderType,
MessageId = Guid.Parse(context.MessageId),
ModifiedAtUtc = DateTime.UtcNow
};
if (shouldBeHandled)
{
log.Info($"Handling message: Type: {checkMessageOrderType}, ContentId: {contentId}, ContentVersion: {contentVersion}");
await dbContext.PersistHandledMessage(inboxMessage).ConfigureAwait(false);
await next().ConfigureAwait(false);
}
else
{
string discardedReason = $"Discarding message since a newer version has already been processed: Type: {checkMessageOrderType}, ContentId: {contentId}, ContentVersion: {contentVersion}";
log.Info(discardedReason);
await dbContext.PersistDiscardedMessage(inboxMessage, latestHandledVersion.GetValueOrDefault()).ConfigureAwait(false);
context.Headers.Add("InboxDiscardedReason", discardedReason);
}
}
}
