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install java 9
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install maven 3.*
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clone this project
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create empty mysql db like desc in application.properties:
spring.jpa.hibernate.ddl-auto=create spring.datasource.url=jdbc:mysql://localhost:3306/psp_db spring.datasource.username=psp_user spring.datasource.password=password -
table and everything will be created on the run
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run "mvn clean install"
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run "java -jar --add-modules java.xml.bind psp-1.0-SNAPSHOT.jar"
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go to "http://localhost:8080/swagger-ui.html#!/transfer45controller/tranferUsingPOST"
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send:
{ "ammount": 10, "fromAccountId": 1, "toAccountId": 2 }
and then
{
"ammount": 20,
"fromAccountId": 2,
"toAccountId": 1
}
Relevant service code is here:
@Transactional(REQUIRES_NEW)
public void transfer(Account fromAccount, Account toAccount, BigDecimal amount) throws InterruptedException {
fromAccount.setBalance(fromAccount.getBalance().subtract(amount));
accountRepository.save(fromAccount);
if(fromAccount.getId() == 1L){
Thread.currentThread().sleep(10000);
}
toAccount.setBalance(toAccount.getBalance().add(amount));
accountRepository.save(toAccount);
transferRepository.save(new Transfer(fromAccount, toAccount, amount));
}