Hi, On Fri, Dec 3, 2010 at 8:55 PM, developer researcher <[email protected]> wrote: > Hello, thanks for your responses, > > I initially thought use a proxy for load balancing but is not > applicable in the context described (a single instance of a service from a > third party). is actually a web application that that exposes part of its > functionality as a web service, the application is not in cluster. > > Is possible that synapse capture the requests, placing them in queue > and if a specific request no answer after a specific time then cancel the > request and send an error message to the client for retry the request?
Synapse can detect many types of errors (including timeouts, connection close etc) and send faults back to the client. You don't have to queue messages to get this functionality. Synapse also supports the dead letter channel, where failed requests can be queued for later delivery. > > @Hiranya: "Synapse can however help reduce the load on the service with > techniques like caching and throttling". Can you give me an example or link > on this? Check samples 370, 371, 372 and 420 in the samples guide [1]. Documentation is slightly outdated but should give you a basic idea. Thanks, Hiranya [1] - http://synapse.apache.org/Synapse_Samples.html > > Thanks and regards, > > 2010/12/2 Ruwan Linton <[email protected]> > >> Also if you can setup alternate services for example another replica of the >> same service, Synapse could create a proxy for the service instances that >> you have and act as the load balancer to balance the load among the service >> instances. >> >> Thanks, >> Ruwan >> >> On Fri, Dec 3, 2010 at 6:58 AM, Hiranya Jayathilaka <[email protected] >> >wrote: >> >> > Hi, >> > >> > On Fri, Dec 3, 2010 at 3:50 AM, developer researcher >> > <[email protected]> wrote: >> > > Hello, >> > > >> > > I have a single instance of a critical service, this service is >> > highly >> > > requested and I want to avoid concurrency issues. This service is >> > provided by >> > > a third party therefore I can not create other instance. In this >> context: >> > > How can help me synapse ESB? >> > >> > I didn't quite understand your requirement. But it seems like you want >> > to scale an existing service to handle a large number of requests. >> > Synapse cannot help an external service scale up. Synapse is only an >> > intermediary. The platform on which the service is deployed should >> > take care of that. >> > >> > Synapse can however help reduce the load on the service with >> > techniques like caching and throttling. If there are backup endpoints >> > Synapse can provide a fail-over routing service. >> > >> > Thanks, >> > Hiranya >> > >> > > >> > > Regards, >> > > >> > >> > >> > >> > -- >> > Hiranya Jayathilaka >> > Senior Software Engineer; >> > WSO2 Inc.; http://wso2.org >> > E-mail: [email protected]; Mobile: +94 77 633 3491 >> > Blog: http://techfeast-hiranya.blogspot.com >> > >> >> >> >> -- >> Ruwan Linton >> Software Architect & Product Manager, WSO2 ESB; http://wso2.org/esb >> WSO2 Inc.; http://wso2.org >> >> Lean . Enterprise . Middleware >> >> phone: +1 408 754 7388 ext 51789 >> email: [email protected]; cell: +94 77 341 3097 >> blog: http://blog.ruwan.org >> linkedin: http://www.linkedin.com/in/ruwanlinton >> google: http://www.google.com/profiles/ruwan.linton >> tweet: http://twitter.com/ruwanlinton >> > -- Hiranya Jayathilaka Senior Software Engineer; WSO2 Inc.; http://wso2.org E-mail: [email protected]; Mobile: +94 77 633 3491 Blog: http://techfeast-hiranya.blogspot.com
