apache camel - How does Timer component polls? -


let's have following time component:

from("timer://foo?period=1000").setbody(constant("select * customer")).to("jdbc:testdb").to("beanref:processresult");

how timer component work here? reads database in every 1 sec or waits bean finish processing?

if bean still processing earlier result , timer keep polling database create bottleneck. there way avoid it?

okay, update: looking @ source code, timer component relies on java timertask implementation. , question answered here: is java's timer task guarenteed not run concurrently?

short answer: 1 single thread executes trigger , routes connected it, there no concurrent execution.

that said, might want controll execution bit. recommended timer tasks (and hence camel timers) have margin between period in timer , max task execution time.

you can use seda component (with concurrentconsumers=[num threads]) in between fine grain controll execution work queue. timer finish it's task right away while real route can continue process.

from("timer://foo?period=1000")     .to("seda:startroute");  from("seda:startroute")     .setbody(constant("select * customer"))     .to("jdbc:testdb").to("beanref:processresult");

each event stack non less, on time, might want tune route period > avg route exec time.

you add shared boolean variable either in singleton bean or in static class:

public static synchronized boolean  isrunning(){     return running; }  public static synchronized void setrunning(boolean isrunning){     running = isrunning; }

the variable should telling weather route running or not , filter timer events occurs while variable true. hook few processors/bean-calls handle this.


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