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Eventuate Tram basic examples

Eventuate Tram implements transactional messaging for microservices written using JDBC. This project implements the examples shown in that project’s README.

It consists of the following modules:

  • eventuate-tram-examples-common - the examples for basic messaging, domain events and command/async reply

  • eventuate-tram-examples-in-memory - runs the examples using in-memory stubs

  • eventuate-tram-examples-jdbc-kafka - runs the examples using MySQL and Apache Kafka

About eventuate-tram-examples-common

This module defines the transactional messaging examples:

  • Basic messaging

  • Domain events

  • Commands, which implement request/asynchronous response

You can run the examples using the tests in the eventuate-tram-examples-in-memory and eventuate-tram-examples-jdbc-kafka modules.

About eventuate-tram-examples-in-memory - running in-memory examples

This module executes the examples using eventuate-tram-in-memory module, which is extremely useful for writing fast running tests.

To run this version of the tests:

./gradlew :eventuate-tram-examples-in-memory:test

About eventuate-tram-examples-jdbc-kafka - running examples with MySQL and Apache Kafka

This module executes the examples using MySQL and Apache Kafka.

Set DOCKER_HOST_IP environment variable

Before running MySQL and Apache Kafka using Docker Compose, you first need to set the DOCKER_HOST_IP environment variable. This must be an IP address or resolvable hostname. It cannot be localhost or 127.0.0.1. Please see this guide to setting DOCKER_HOST_IP for more information.

Run MySQL and Apache Kafka

Once you have set DOCKER_HOST_IP you can then run MySQL and Apache Kafka using Docker Compose.

gradlew <database><mode>ComposeBuild
gradlew <database><mode>ComposeUp

where <database><mode> one of

  • mysqlbinlog

  • postgrespolling

  • postgreswal

Run the tests

Once the containers have started you can run the tests:

./gradlew :eventuate-tram-examples-jdbc-kafka:test

Inspect the database

You can inspect the Eventuate Tram-related database tables:

$ ./mysql-cli.sh -it
Welcome to the MySQL monitor.  Commands end with ; or \g.
...

mysql> select * from message\G
*************************** 1. row ***************************
         id: 00000168d96469db-acde480011220000
destination: destination1549835461824
    headers: {"DESTINATION":"destination1549835461824","ID":"00000168d96469db-acde480011220000"}
    payload: Hello1549835461824
  published: 0

...
mysql> select * from received_messages\G
*************************** 1. row ***************************
consumer_id: commandDispatcheId1549835467791
 message_id: 00000168d9647f65-acde480011220000
*************************** 2. row ***************************
...
mysql> quit
Bye

Clean up

To clean up:

./gradlew <database><mode>ComposeDown

For more information

Please read the Eventuate Tram getting started guide or look at the examples.