public virtual Task <MessageJournalReadResult> Read(MessageJournalPosition start, int count, MessageJournalFilter filter = null,
CancellationToken cancellationToken = default(CancellationToken))
{
var myStart = (Position)start;
IList <MessageJournalEntry> myEntries;
lock (_syncRoot)
{
myEntries = _entries.Skip(myStart.Index)
.Where(entry => MatchesFilter(filter, entry))
.Take(count + 1)
.ToList();
}
var next = myStart;
var endOfJournal = myEntries.Count <= count;
if (myEntries.Any())
{
var lastIndex = myEntries.Select(e => e.Position).OfType <Position>().Max(p => p.Index);
next = new Position(lastIndex + 1);
}
var readResult = new MessageJournalReadResult(start, next, endOfJournal, myEntries.Take(count));
return(Task.FromResult(readResult));
}
/// <inheritdoc />
public override Task <MessageJournalReadResult> Read(MessageJournalPosition start, int count, MessageJournalFilter filter = null,
CancellationToken cancellationToken = new CancellationToken())
{
CheckDisposed();
return(_commandExecutor.ExecuteRead(
() => base.Read(start, count, filter, cancellationToken),
cancellationToken));
}
protected async Task WhenReadingToEndOfJournal()
{
MessageJournalReadResult result;
do
{
result = await MessageJournal.Read(Start, Count, Filter);
Pages.Add(result);
Start = result.Next;
} while (!result.EndOfJournal);
}
public async Task Update(string consumer, MessageJournalPosition next)
{
if (string.IsNullOrWhiteSpace(consumer))
{
throw new ArgumentNullException(nameof(consumer));
}
if (next == null)
{
throw new ArgumentNullException(nameof(next));
}
var filter = Builders <JournalConsumerProgress> .Filter.Eq(x => x.Consumer, consumer.Trim().ToLower());
var update = Builders <JournalConsumerProgress> .Update.Set(sp => sp.Next, next.ToString());
await _collection.UpdateOneAsync(filter, update, new UpdateOptions { IsUpsert = true });
}
/// <inheritdoc />
public async Task <MessageJournalReadResult> Read(MessageJournalPosition start, int count, MessageJournalFilter filter = null,
CancellationToken cancellationToken = new CancellationToken())
{
var fb = Builders <MessageJournalEntryDocument> .Filter;
var filterDef = fb.Gte(mje => mje.Id, ((MongoDBMessageJournalPosition)start).Id);
filterDef = BuildFilter(filter, filterDef, fb);
var options = new FindOptions();
if (_collationSupported)
{
options.Collation = _collation;
}
var entryDocuments = await _messageJournalEntries.Find(filterDef, options)
.Limit(count + 1)
.ToListAsync(cancellationToken);
var endOfJournal = entryDocuments.Count <= count;
var nextId = entryDocuments.Select(e => e.Id).LastOrDefault();
if (endOfJournal)
{
nextId = new ObjectId(nextId.Timestamp, nextId.Machine, nextId.Pid, nextId.Increment + 1);
}
var nextPosition = new MongoDBMessageJournalPosition(nextId);
var entries = new List <MessageJournalEntry>();
foreach (var entryDocument in entryDocuments.Take(count))
{
var position = new MongoDBMessageJournalPosition(entryDocument.Id);
var timestamp = entryDocument.Timestamp;
var category = entryDocument.Category;
var headers = new MessageHeaders(entryDocument.Headers);
var message = new Message(headers, entryDocument.Content);
entries.Add(new MessageJournalEntry(category, position, timestamp, message));
}
return(new MessageJournalReadResult(start, nextPosition, endOfJournal, entries));
}
protected async Task GivenAtBeginningOfJournal()
{
Start = await MessageJournal.GetBeginningOfJournal();
}
/// <inheritdoc />
public virtual async Task <MessageJournalReadResult> Read(MessageJournalPosition start, int count, MessageJournalFilter filter = null, CancellationToken cancellationToken = default(CancellationToken))
{
var myFilter = filter ?? new MessageJournalFilter();
var next = start;
var journaledMessages = new List <MessageJournalEntry>();
var endOfJournal = true;
var connection = ConnectionProvider.GetConnection();
try
{
var commandBuilder = CommandBuilders.NewSelectJournaledMessagesCommandBuilder();
commandBuilder.Categories = myFilter.Categories.Select(c => (string)c).ToList();
commandBuilder.Topics = myFilter.Topics.Select(t => (string)t).ToList();
commandBuilder.From = myFilter.From;
commandBuilder.To = myFilter.To;
commandBuilder.Origination = myFilter.Origination;
commandBuilder.Destination = myFilter.Destination;
commandBuilder.RelatedTo = myFilter.RelatedTo;
commandBuilder.MessageName = myFilter.MessageName;
commandBuilder.Start = ((SQLMessageJournalPosition)start).Id;
commandBuilder.Count = count + 1;
using (var scope = new TransactionScope(TransactionScopeOption.Suppress, TransactionScopeAsyncFlowOption.Enabled))
{
using (var command = commandBuilder.BuildDbCommand(connection))
{
using (var reader = await command.ExecuteReaderAsync(cancellationToken))
{
while (await reader.ReadAsync(cancellationToken))
{
var record = commandBuilder.BuildJournaledMessageRecord(reader);
next = new SQLMessageJournalPosition(record.Id);
if (journaledMessages.Count < count)
{
var category = record.Category;
var timestamp = record.Timestamp;
var headers = DeserializeHeaders(record.Headers);
var messageContent = record.Content;
var offset = new SQLMessageJournalPosition(record.Id);
var message = new Message(headers, messageContent);
var journaledMessage = new MessageJournalEntry(category, offset, timestamp, message);
journaledMessages.Add(journaledMessage);
next = new SQLMessageJournalPosition(record.Id + 1);
}
else
{
endOfJournal = false;
}
}
}
}
scope.Complete();
}
}
finally
{
ConnectionProvider.ReleaseConnection(connection);
}
return(new MessageJournalReadResult(start, next, endOfJournal, journaledMessages));
}
