design patterns - Spring boot and rabbitmq integration, how to recover on component failure? -


i have spring rest app rabbit messaging middle ware. when app accepts incoming rest request, replies user meanwhile processing asynchronously, generates new message , puts on rabbit. there, consumers read message , deliver external system. now, there case rabbit server may down. handle kind of failure, have blocking queue (of course adjustable size) 

 @bean public taskexecutor taskexecutor() {     threadpooltaskexecutor executor = new threadpooltaskexecutor();     executor.setcorepoolsize(5);     executor.setmaxpoolsize(10);     executor.setqueuecapacity(25);      return executor; }

the queue able handle messages until rabbit comes online. if takes long , requests exceeds queue size, going fail. question is, there ways can improve , make more efficient? industry best practice? there patterns scenario?

i used spring retryable. pretty sufficient requirement. can retry, configure retry intervals, max attempts etc. implement custom recover function.

   @async     @retryable(value = { amqpexception.class },             maxattempts=10, backoff=@backoff(delay=100, maxdelay=300000,multiplier = 2))     public void sendemailmessagetoqueue(simplemailmessage email){         log.info("sending message queue"+thread.currentthread().getname());         try {             rabbittemplate.convertandsend(queuename, email);         }catch (amqpexception e){             log.log(level.warning,"could not send message queue, retry.",e);         }     }      @recover     public void connectionexception(amqpexception e) {         log.log(level.severe,"could not send message queue, save message in db instead."+thread.currentthread().getname(),e);     }

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