Hi In Camel 1.6.0 and 2.0 we have had a performance issue that could seriously degrade performance by x2-x10 when you did stress test by sending > 1000 msg/sec.
The cause of this is the TypeConverter that will throw a NoSuchTypeConverterExists when Camel cannot converter to the desired type. We do this internally in Camel in some areas of the code where we will ignore this exception and eg. continue. We did a fix for this performance issue in the stream cache but this was just a fix in once place. Lately this issue surfaced again in camel-mina when using UDP. So I have been experimenting with doing a fix once for all. I suggest to: - add 2 new methods to TypeConverter that returns *null* instread of throwing the NoSuchTypeConverterExists exception. I have named them: tryConvertTo. But maybe there is a better name? - add 1 new method on Message to get the body using the try convert to instead. I have named the method: tryGetBody(T). But maybe there is a better name? - Use tryGetBody internally in Camel where we today do try .. catch(NoSuchTypeConverterExists) - Then we can expose the regular getBody(T) for the end users, and let it act as it does today by throwing the exception - We can also optimize the DefaultTypeConverter to let it look in the miss cache first if it have tried to convert this before but could not If the tryGetBody, tryConvertTo are you to your liking we can also do: - add a new method to TypeConvert: boolean canConvertTo(T, value) - add a new method to Message: boolean canGetBody(T, value) - then use that method as guard before doing the regular convertTo/getBody But this requires that you always use this as guard, to be sure that the NoSuchTypeConverterExists is not thrown And it also requires that we use the miss cache to not do 2x convertions, 1 for the boolean check, and then 1 for the actual convertion It also requires that the body can be converted multiple times. Whether solution 1 or 2 we also need to check the other components and fix it internally as well, so we dont have a situation like mina with UDP that was affected by the performance drawback. In my experiment I have the first solution up and running. Any thoughts? I will create a JIRA ticket for this one as well so we wont forget it. -- Claus Ibsen Apache Camel Committer Open Source Integration: http://fusesource.com Blog: http://davsclaus.blogspot.com/
