Sample

A sampling throttler allows you to extract a sample of the exchanges from the traffic through a route.

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The Sample EIP works similar to a wire tap, but instead of tapping every message, the sampling will select a single message in a given time period. This selected message is allowed to pass through, and all other messages are stopped.

Options

The Sample eip supports 3 options, which are listed below.

Name Description Default Type

samplePeriod

Sets the sample period during which only a single Exchange will pass through.

1000

String

messageFrequency

Sets the sample message count which only a single Exchange will pass through after this many received.

Long

disabled

Whether to disable this EIP from the route during build time. Once an EIP has been disabled then it cannot be enabled later at runtime.

false

Boolean

description

Sets the description of this node.

DescriptionDefinition

Using Sample EIP

In the example below we sample one message per second (default time period):

from("direct:sample")
    .sample()
    .to("direct:sampled");

And in XML

<route>
    <from uri="direct:sample"/>
    <sample>
        <to uri="direct:sampled"/>
    </sample>
</route>

Sampling using time period

The default time period is 1 second, but this can easily be configured. For example to sample 1 message per 5 seconds you can do:

from("direct:sample")
    .sample(5, TimeUnit.SECONDS)
    .to("direct:sampled");

And in XML

<route>
    <from uri="direct:sample"/>
    <sample samplePeriod="5000">
        <to uri="direct:sampled"/>
    </sample>
</route>

Sampling using message frequency

The Sample EIP can also be configured to sample based on frequency instead of time period.

For example to sample every 10th message you can do:

from("direct:sample")
    .sample(10)
    .to("direct:sampled");

And in XML

<route>
    <from uri="direct:sample"/>
    <sample messageFrequency="10">
        <to uri="direct:sampled"/>
    </sample>
</route>
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