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Azure Cosmos DB for CDC and Outbox Pattern

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Pragya Keshap answered on February 3, 2023 Popularity 1/10 Helpfulness 1/10

answer Azure Cosmos DB for CDC and Outbox Pattern

Azure Cosmos DB for CDC and Outbox Pattern

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Azure Cosmos DB is a globally distributed, multi-model

database service offered by Microsoft Azure.

▪ It supports various database models, including document,

key-value, column-family, and graph, and can be

accessed through multiple APIs, such as SQL, MongoDB,

Cassandra, and Azure Table Storage.

▪ Azure Cosmos DB has built-in support for Change Data

Capture (CDC), allows it to track and propagate data

changes made to the database to other systems in near

real-time.

▪ CDC in Azure Cosmos DB works by continuously

monitoring the transaction logs of the database for

changes and extracting those changes to be sent to

target systems.

▪ Azure Cosmos DB change feed API to access the data

changes and process them in your application.

 public static void main(String[] args) {
        // Create a SessionFactory based on our hibernate.cfg.xml configuration
        // file, which defines how to connect to the database.
        SessionFactory sessionFactory
                = new Configuration()
                        .configure("hibernate.cfg.xml")
                        .addAnnotatedClass(Account.class)
                        .buildSessionFactory();

        try (Session session = sessionFactory.openSession()) {
            long fromAccountId = 1;
            long toAccountId = 2;
            BigDecimal transferAmount = BigDecimal.valueOf(100);

            if (FORCE_RETRY) {
                System.out.printf("APP: About to test retry logic in 'runTransaction'\n");
                runTransaction(session, forceRetryLogic());
            } else {

                runTransaction(session, addAccounts());
                BigDecimal fromBalance = runTransaction(session, getAccountBalance(fromAccountId));
                BigDecimal toBalance = runTransaction(session, getAccountBalance(toAccountId));
                if (!fromBalance.equals(-1) && !toBalance.equals(-1)) {
                    // Success!
                    System.out.printf("APP: getAccountBalance(%d) --> %.2f\n", fromAccountId, fromBalance);
                    System.out.printf("APP: getAccountBalance(%d) --> %.2f\n", toAccountId, toBalance);
                }

                // Transfer $100 from account 1 to account 2
                BigDecimal transferResult = runTransaction(session, transferFunds(fromAccountId, toAccountId, transferAmount));
                if (!transferResult.equals(-1)) {
                    // Success!
                    System.out.printf("APP: transferFunds(%d, %d, %.2f) --> %.2f \n", fromAccountId, toAccountId, transferAmount, transferResult);

                    BigDecimal fromBalanceAfter = runTransaction(session, getAccountBalance(fromAccountId));
                    BigDecimal toBalanceAfter = runTransaction(session, getAccountBalance(toAccountId));
                    if (!fromBalanceAfter.equals(-1) && !toBalanceAfter.equals(-1)) {
                        // Success!
                        System.out.printf("APP: getAccountBalance(%d) --> %.2f\n", fromAccountId, fromBalanceAfter);
                        System.out.printf("APP: getAccountBalance(%d) --> %.2f\n", toAccountId, toBalanceAfter);
                    }
                }
            }
        } finally {
            sessionFactory.close();
        }
    }
}

https://learn.microsoft.com/en-us/azure/architecture/best-practices/transactional-outbox-cosmos

Popularity 1/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: azure cdc cosmos java outbox-pattern

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Contributed on Feb 03 2023

Pragya Keshap

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Azure Cosmos DB for CDC and Outbox Pattern

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