Hello community,
I am currently working on a feature within the Camel project that involves
processing Kafka messages (String) and performing a query based on that
message. Initially, I implemented a classic route that called a service
method responsible for executing the query. However, I encountered an issue
with the size of the query result, as the memory couldn't handle such a
massive amount of data.
In response to this challenge, I devised an alternative solution that might
be considered unconventional. The approach involves querying the database
multiple times and retrieving the results in manageable chunks.
Consequently, the route needs to be executed multiple times. The current
structure of my route is as follows:
from(getInput())
.routeId(getRouteId())
.bean(Service.class, "extractDataInChunks")
.choice()
.when(header(PAGINATION_END_FLAG).isEqualTo(true)).to(getOutput())
.when(header(PAGINATION_END_FLAG).isEqualTo(false)).to(getOutput(),directUri(getRouteId()));
//re-execute the route with offset = offset+limit
The extractDataInChunks method queries the database with a parameterized
limit (chunk size) and an offset that ranges from 0 to X * limit. The
PAGINATION_END_FLAG is a Camel header, initially set to false, and is
switched to true by the extractDataInChunks method if the size of the query
result is 0.
I would appreciate feedback on whether this solution adheres to good Camel
practices, specifically the consideration of implementing business logic at
the route level. Additionally, I am curious if there are any built-in
Enterprise Integration Patterns (EIPs) in Camel that might be more suitable
for my business requirements.
Thank you for your insights.
