Concurrent processing of single InputStream with independent consumers

Question

I need to spawn N consumer threads, which process same InputStream concurrently, e.g - transform it somehow, calculate checksum or digital signature etc. These consumers do not

Answer 1

You can try some Java Messaging Service (JMS) implementation like Apache ActiveMQ.

In your case you'd need to create a so called Topic (see Topics vs. Queues). A topic is created by the producer, and is published to N consumers, which may run concurrently, with each consumer receiving exactly the same data.

Since you want to use InputStreams there is a chapter on how to send messages are streams.

I suppose, typically, producers and consumers would be separate processes, probably running on different machines on the network. I think you can configure it to run completely in a single JVM, though. This would depend on the implementation of JMS. These are also quite famous: HornetQ by JBoss, RabbitMQ, and a whole bunch of others.