Jyrki Ruuskanen created CAMEL-8421:
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Summary: Add minimum age option to readLock=changed
Key: CAMEL-8421
URL: https://issues.apache.org/jira/browse/CAMEL-8421
Project: Camel
Issue Type: Improvement
Components: camel-core, camel-ftp
Reporter: Jyrki Ruuskanen
Priority: Minor
I'm a fan of noop=true in file consumers since I don't have to worry about how
many readers I have and where. Finally I came across a scenario where current
features are not sufficient.
Let's say we have a source system which writes files with name
<timestamp>_something.xml, and it won't use temp files or .done marker files or
anything like that. We want to get the latest file as soon as it's created.
Consider the following route:
{code}
from("file:////somewhere/data?noop=true&include=.*_something[.]xml&readLock=changed&sortBy=file:name")
.aggregate(constant(true), new
UseLatestAggregationStrategy()).completionFromBatchConsumer()
.to("amq:topic:something");
{code}
When this route is started it will go through the files in order and get the
last one. Then it will wait for new files. This works fine as long as the
writer is not "slow".
Now, we had cases of incomplete files being read and I was requested to not to
read the file before it is 10 minutes old, just in case. If I increase
readLockCheckInterval to 10 minutes getting to the latest file at route startup
will take close to forever. The current readLock=changed implementation always
sleeps for at least one readLockCheckInterval per file.
If we had readLockMinAge option to define the minimum age for the target file
the consumer could acquire readLock on the first poll and breeze through the
files until too young a file is reached.
The route below would poll a file every 500ms (default poll delay), while the
current readLock=changed would take 1500ms (default poll delay + default
readLockCheckInterval) per file. Consumer goes through the files until it hits
the end and gets the last one as soon as it becomes old enough.
{code}
from("file:////somewhere/data?noop=true&include=.*_something[.]xml&readLock=changed&readLockMinAge=600000&sortBy=file:name")
.aggregate(constant(true), new
UseLatestAggregationStrategy()).completionFromBatchConsumer()
.to("amq:topic:something");
{code}
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