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Posted to commits@camel.apache.org by bu...@apache.org on 2012/05/17 00:18:07 UTC
svn commit: r817970 - in /websites/production/camel/content:
cache/main.pageCache
why-does-my-file-consumer-not-pick-up-the-file-and-how-do-i-let-the-file-consumer-use-the-camel-error-handler.html
Author: buildbot
Date: Wed May 16 22:18:07 2012
New Revision: 817970
Log:
Production update by buildbot for camel
Added:
websites/production/camel/content/why-does-my-file-consumer-not-pick-up-the-file-and-how-do-i-let-the-file-consumer-use-the-camel-error-handler.html
Modified:
websites/production/camel/content/cache/main.pageCache
Modified: websites/production/camel/content/cache/main.pageCache
==============================================================================
Binary files - no diff available.
Added: websites/production/camel/content/why-does-my-file-consumer-not-pick-up-the-file-and-how-do-i-let-the-file-consumer-use-the-camel-error-handler.html
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--- websites/production/camel/content/why-does-my-file-consumer-not-pick-up-the-file-and-how-do-i-let-the-file-consumer-use-the-camel-error-handler.html (added)
+++ websites/production/camel/content/why-does-my-file-consumer-not-pick-up-the-file-and-how-do-i-let-the-file-consumer-use-the-camel-error-handler.html Wed May 16 22:18:07 2012
@@ -0,0 +1,189 @@
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+ Apache Camel: Why does my file consumer not pick up the file, and how do I let the file consumer use the Camel error handler?
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+<div class="wiki-content maincontent"><h2><a shape="rect" name="Whydoesmyfileconsumernotpickupthefile%2CandhowdoIletthefileconsumerusetheCamelerrorhandler%3F-Whydoesmyfileconsumernotpickupthefile%2CandhowdoIletthefileconsumerusetheCamelerrorhandler%3F"></a>Why does my file consumer not pick up the file, and how do I let the file consumer use the Camel error handler?</h2>
+
+<p>There could be several reasons why the <a shape="rect" href="file2.html" title="File2">File</a> consumer is not picking up files. For example it may not run at all, or it cannot acquire a read lock on the file.<br clear="none">
+<a shape="rect" href="logging-questions.html" title="Logging Questions">Check the logs</a> for any exceptions or other informative messages. You can <a shape="rect" href="how-do-i-enable-debug-logging.html" title="How do I enable debug logging">turn on DEBUG logging</a> at <tt>org.apache.camel.component.file</tt> to see more detail.</p>
+
+<h3><a shape="rect" name="Whydoesmyfileconsumernotpickupthefile%2CandhowdoIletthefileconsumerusetheCamelerrorhandler%3F-HowtouseCamel%27sroutingerrorhandlerswiththefileconsumer"></a>How to use Camel's routing error handlers with the file consumer</h3>
+
+<p>Well, this is really a "<a shape="rect" class="external-link" href="http://en.wikipedia.org/wiki/Chicken_or_the_egg" rel="nofollow">chicken or the egg</a>" question. The Camel <a shape="rect" href="error-handling-in-camel.html" title="Error handling in Camel">error handler</a> (e.g., in the routes) only applies when a message is being routed by the routing engine. <br clear="none">
+Before this happens, a consumer must successfully receive a message, create a Camel <a shape="rect" href="exchange.html" title="Exchange">Exchange</a>, populate the <a shape="rect" href="exchange.html" title="Exchange">Exchange</a> with message details (e.g., body and headers), and then pass the <a shape="rect" href="exchange.html" title="Exchange">Exchange</a> to the routing engine. Only at this point can the routing error handler deal with exceptions occurring. Before this point, any error handling is really <a shape="rect" href="component.html" title="Component">Component</a>-specific.</p>
+
+<div class="panelMacro"><table class="infoMacro"><colgroup span="1"><col span="1" width="24"><col span="1"></colgroup><tr><td colspan="1" rowspan="1" valign="top"><img align="middle" src="https://cwiki.apache.org/confluence/images/icons/emoticons/information.gif" width="16" height="16" alt="" border="0"></td><td colspan="1" rowspan="1"><b>Bridge with error handler</b><br clear="none">From Camel 2.10 onwards the file and ftp consumers can now bridge to the Camel routing engine's error handler. See more details at the <tt>consumer.bridgeErrorHandler</tt> option on the <a shape="rect" href="file2.html" title="File2">File</a> documentation.</td></tr></table></div>
+
+<p>If the component consumer extends the <a shape="rect" class="external-link" href="http://svn.apache.org/viewvc/camel/trunk/camel-core/src/main/java/org/apache/camel/impl/DefaultConsumer.java?view=markup"><tt>DefaultConsumer</tt></a> from Camel, then it offers an <a shape="rect" class="external-link" href="http://svn.apache.org/viewvc/camel/trunk/camel-core/src/main/java/org/apache/camel/spi/ExceptionHandler.java?view=markup"><tt>org.apache.camel.spi.ExceptionHandler</tt></a> hook for end users to plug-in a custom strategy. The default implementation from Camel is <a shape="rect" class="external-link" href="http://svn.apache.org/viewvc/camel/trunk/camel-core/src/main/java/org/apache/camel/impl/LoggingExceptionHandler.java?view=markup"><tt>LoggingExceptionHandler</tt></a> that will log the exception at <tt>ERROR</tt>/<tt>WARN</tt> level, and then ignore the exception.</p>
+
+<p>See the <a shape="rect" href="file2.html" title="File2">File</a> page in the bottom for an example how to use a custom <tt>ExceptionHandler</tt> that sends a new message to the Camel routing engine, which then allows the routing engine to trigger its own error handling to deal with the exception.</p></div>
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