// Determines if the message should be delivered to the queue. If the exchange is marked
// with a predicate attribute, the corresponding externally named script is executed to
// determine if the message has passing criteria. If no external script is specified,
// the exchange's Satisfies method is called.
private async Task <bool> SatisfiesExchangeCriteria(MessageExchangeDefinition exchangeDef, IMessage message)
{
ScriptPredicate predicate = exchangeDef.Exchange.Settings.Predicate;
if (predicate != null)
{
return(await _scriptingSrv.SatisfiesPredicate(message, predicate));
}
return(exchangeDef.Exchange.Satisfies(message));
}
private void LogPublishingExchangeMessage(IMessage message,
MessageExchangeDefinition exchangeDef)
{
_logger.LogTraceDetails(RabbitMqLogEvents.MESSAGE_PUBLISHER, "Publishing to Exchange",
new
{
Message = message,
ContentType = message.GetContentType(),
exchangeDef.Exchange.BrokerName,
exchangeDef.Exchange.ExchangeName
});
}
private async Task PublishAsync(MessageExchangeDefinition exchangeDef, IMessage message)
{
if (!await SatisfiesExchangeCriteria(exchangeDef, message))
{
return;
}
IMessageExchange exchange = exchangeDef.Exchange;
string[] orderedContentTypes =
{
message.GetContentType(),
exchange.Settings.ContentType
};
byte[] messageBody = _serializationMgr.Serialize(message, orderedContentTypes);
LogPublishingExchangeMessage(message, exchangeDef);
using (var channel = _connMgr.CreateChannel(exchange.BrokerName))
{
exchangeDef.Exchange.Publish(channel, message, messageBody);
}
}
