| == Camel Artemis Large Messages |
| |
| === Introduction |
| |
| This example shows how to send large messages between Apache Camel and |
| ActiveMQ Artemis. When we say large messages we refer to messages with |
| sizes of GB. |
| |
| You should be able to run Camel and Artemis in JVMs with lower memory |
| such as 256/512mb etc, and still be able to send messages in GB of sizes |
| between them. |
| |
| This works by spool big messages to disk. Artemis spool large messages |
| to its `+data/large-messages+` directory, and Camel uses stream caching |
| to spool to a temporary directory during routing. |
| |
| === Build |
| |
| The example is run using Maven. |
| |
| First compile the example by entering: |
| |
| .... |
| mvn compile |
| .... |
| |
| === Install ActiveMQ Artemis |
| |
| To automate downloading, unpacking and configuration of Apache ActiveMQ |
| Artemis with latest defined version a special profile is added. It's |
| necessary to run following Maven command for do this during example |
| install: |
| |
| .... |
| mvn install -P artemis |
| .... |
| |
| === Run ActiveMQ Artemis |
| |
| To start configured ActiveMQ Artemis instance in a shell use: |
| |
| .... |
| $ target/artemis-instance/bin/artemis run |
| .... |
| |
| Which startup ActiveMQ Artemis in the foreground and keeps it running |
| until you hit ctrl+c to shutdown ActiveMQ Artemis. |
| |
| === Run Camel |
| |
| Before running this example, then ensure the JVM has limited memory by |
| executing |
| |
| .... |
| export MAVEN_OPTS="-Xmx256m" |
| .... |
| |
| And then start the Camel application: |
| |
| .... |
| mvn camel:run |
| .... |
| |
| You can then copy files to `+target/inbox+` folder which is send to |
| Artemis, and then back again to Camel and written to the |
| `+target/outbox+` folder. |
| |
| This should work for small and big files such as files with sizes of GB. |
| The JVM should not run out of memory. |
| |
| To stop the example hit ctrl+c. If you restart it and resume entering |
| numbers you should see that it remembered previously entered values, as |
| it uses a persistent store. |
| |
| === ActiveMQ Artemis web console |
| |
| You can browse the Artemis web console: http://localhost:8161/console to |
| see activity such as number of consumers and producers. You can also |
| delete all messages from queues which is a handy operation. |
| |
| === Help and contributions |
| |
| If you hit any problem using Camel or have some feedback, then please |
| https://camel.apache.org/support.html[let us know]. |
| |
| We also love contributors, so |
| https://camel.apache.org/contributing.html[get involved] :-) |
| |
| The Camel riders! |
