How to implement a parallel processing with **direct** endpoint in Camel?

Question

Below testing code doesn't work

from("direct:start").setExchangePattern(ExchangePattern.InOnly).threads(5).delay(2000).bean(MessageHeaderValidator.class);

Although seda is the alternative, referring to Camel seda document . It is recommended to use the direct endpoint instead.

Thread pools

Be aware that adding a thread pool to a SEDA endpoint by doing something like:

from("seda:stageName").thread(5).process(...)

Can wind up with two BlockQueues: one from the SEDA endpoint, and one from the workqueue of the thread pool, which may not be what you want.Instead, you might wish to configure a Direct endpoint with a thread pool, which can process messages both synchronously and asynchronously. For example:

from("direct:stageName").thread(5).process(...) 

You can also directly configure number of threads that process messages on a SEDA endpoint using the concurrentConsumers option.

Answer 1

For parallel processing, use Camel's SEDA component with the concurrentConsumers option:

from("seda:stageName?concurrentConsumers=5")
    .process(...);

Answer 2

根本原因是，该消息正在for循环中被生产者模板阻塞逐一传递。