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https://issues.apache.org/jira/browse/CAMEL-11484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16068937#comment-16068937
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Claus Ibsen edited comment on CAMEL-11484 at 6/29/17 8:34 PM:
--------------------------------------------------------------
This only applies to more complex simple languages with nested functions, which
would cause being evaluated per exchange, which then would create a new simple
expression, that was not cached/reused. For example to call a random function
where the max value is a nested simple expression
{code}
${random(1,${header.max})}
{code}
Then at runtime, header.max is created as a new simple expression each time. By
using the cache we can avoid this overhead.
For non nested simple expressions then they are fast today, eg
{code}
${body}
{code}
Or
{code}
Hello ${body} how are ${headers.foo} today
{code}
was (Author: davsclaus):
This only applies to more complex simple languages with nested functions, which
would cause being evaluated per exchange, which then would create a new simple
expression, that was not cached/reused. For example to call a random function
where the max value is a nested simple expression
{code}
${random(1,${header.max})}
{code}
Then at runtime, header.max is created as a new simple expression each time. By
using the cache we can avoid this overhead.
> Optimise - Simple Language / ExpressionBuilder can use cache of frequent used
> expressions
> -----------------------------------------------------------------------------------------
>
> Key: CAMEL-11484
> URL: https://issues.apache.org/jira/browse/CAMEL-11484
> Project: Camel
> Issue Type: Improvement
> Components: camel-core
> Reporter: Claus Ibsen
> Assignee: Claus Ibsen
> Fix For: 2.20.0
>
>
> If you use a simple expression in a Camel route that has a simple token, then
> it's re-created per exchange during routing. The expression by itself can be
> cached and reused, which avoids using the simple parser over and over again.
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