1.2 Components of MicroTx

MicroTx contains two components: the transaction coordinator and the MicroTx library.

MicroTx, a containerized microservice, runs along with your application microservices. The following figure shows how the components of MicroTx interact with your application microservices.

Transaction Coordinator Server

The transaction coordinator manages transactions amongst the participant services.

MicroTx supports internal memory, Oracle Database, and etcd as a data store for persistence of transaction state.

MicroTx library

Application microservices provide the business logic and demarcate transaction boundaries. These services participate in a distributed transaction. They use MicroTx APIs to manage their distributed transactions.

Application developers use different parts of the MicroTx client library depending on the following factors:

• The development framework of the microservice, such as Helidon or Node.js.
• The selected transaction protocol, such as XA, Saga, or TCC.
• Whether the application initiates a transaction or participates in the transaction.
  • Transaction initiator service - These applications start and end a transaction. In the preceding figure, Microservice 1 is the transaction initiator service and it sends a request to MicroTx to begin the transaction.
  • Transaction participant service - These applications only join the transaction. They do not initiate the transaction. In the preceding figure, Microservice 2 and Microservice 3 are the transaction participant services that are involved in the transaction.