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8.15. Sampling
Sampling Throttler
A sampling throttler allows you to extract a sample of exchanges from the traffic through a route. It is configured with a sampling period during which only a single exchange is allowed to pass through. All other exchanges will be stopped.
By default, the sample period is 1 second.
Java DSL example
Use the
sample() DSL command to invoke the sampler as follows:
// Sample with default sampling period (1 second)
from("direct:sample")
.sample()
.to("mock:result");
// Sample with explicitly specified sample period
from("direct:sample-configured")
.sample(1, TimeUnit.SECONDS)
.to("mock:result");
// Alternative syntax for specifying sampling period
from("direct:sample-configured-via-dsl")
.sample().samplePeriod(1).timeUnits(TimeUnit.SECONDS)
.to("mock:result");
from("direct:sample-messageFrequency")
.sample(10)
.to("mock:result");
from("direct:sample-messageFrequency-via-dsl")
.sample().sampleMessageFrequency(5)
.to("mock:result");Spring XML example
In Spring XML, use the sample element to invoke the sampler, where you have the option of specifying the sampling period using the
samplePeriod and units attributes:
<route>
<from uri="direct:sample"/>
<sample samplePeriod="1" units="seconds">
<to uri="mock:result"/>
</sample>
</route>
<route>
<from uri="direct:sample-messageFrequency"/>
<sample messageFrequency="10">
<to uri="mock:result"/>
</sample>
</route>
<route>
<from uri="direct:sample-messageFrequency-via-dsl"/>
<sample messageFrequency="5">
<to uri="mock:result"/>
</sample>
</route>Options
The
sample DSL command supports the following options:
| Name | Default Value | Description |
|---|---|---|
messageFrequency
|
Samples the message every N'th message. You can only use either frequency or period. | |
samplePeriod
|
1
|
Samples the message every N'th period. You can only use either frequency or period. |
units
|
SECOND
|
Time unit as an enum of java.util.concurrent.TimeUnit from the JDK.
|
