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https://issues.apache.org/jira/browse/WW-4749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16004440#comment-16004440
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ASF GitHub Bot commented on WW-4749:
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Github user lukaszlenart commented on the issue:
https://github.com/apache/struts/pull/134
@fustaki done, are we ok?
> Buffer/Flush behaviour in FreemarkerResult
> ------------------------------------------
>
> Key: WW-4749
> URL: https://issues.apache.org/jira/browse/WW-4749
> Project: Struts 2
> Issue Type: Improvement
> Components: Core Results
> Affects Versions: 2.3.31, 2.5.1
> Reporter: Lorenzo Bernacchioni
> Assignee: Lukasz Lenart
> Priority: Minor
> Fix For: 2.5.next
>
>
> Scenario: the application use freemarker with a
> {{TemplateExceptionHandler.RETHROW_HANDLER}} policy, but occasionally needs
> to produce large XML (20~200Mb) and goes out of memory.
> In
> [FreemarkerResult|http://grepcode.com/file/repo1.maven.org/maven2/org.apache.struts/struts2-core/2.5-BETA1/org/apache/struts2/views/freemarker/FreemarkerResult.java#191]
> there are two possible behaviours (line 191):
> * *Buffer-behaviour*: the whole template is processed and if everything is
> OK it is flushed to the output, otherwise an exception is thrown and handled
> at higher level before any output has been sent. This is intended to be used
> when {{TemplateExceptionHandler.RETHROW_HANDLER}} is active
> * *Flush-behaviour*: template is processed and flushed according to
> freemarker library policies, used with any other {{TemplateExceptionHandler}}
> Since {{TemplateExceptionHandler}} cannot be switched for a given request (it
> is a global configuration embedded in {{FreemarkerManager}}) there is no way
> to force a Flush-behaviour. (you can only force a Buffer-behaviour using
> {{isWriteIfCompleted}})
> I implemented a more flexible solution that let you force the behaviour in
> both ways:
> {code:title=FreemarkerResult.java|borderStyle=solid}
> final boolean willUsebufferedWriter;
> if (useBufferedWriter != null){
> willUsebufferedWriter = useBufferedWriter;
> }else{
> willUsebufferedWriter = configuration.getTemplateExceptionHandler()
> == TemplateExceptionHandler.RETHROW_HANDLER;
> }
>
> if (willUsebufferedWriter){
> ...
> }else{
> ...
> }
> {code}
> where {{useBufferedWriter}} is a parameter that can be modified per request
> {code}
> <result type="freemarker">
> <param name="location">big_feed.ftl</param>
> <param name="contentType">text/xml</param>
> <param name="useBufferedWriter">false</param>
> </result>
> {code}
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