Question

我正在尝试编写自己的自定义PlatformTransactionManager以便与Neo4J一起使用（注意-由于各种原因，我不想使用OGM，这意味着不使用Spring Data）。

我编写了一个非常简单的Neo4jTransactionManager并将其添加到我的上下文中，以及@EnableTransactionManagement批注，然后将@Transactonal添加到了我的运行状况检查-它不会触发任何东西。

代码如下：（注意-Neo4jOperations是Driver的包装，使调用数据库更加容易，类似于JdbcOperations）

class Neo4jTransactionManager(private val driver: Driver) : AbstractPlatformTransactionManager() {
    companion object {
        private val LOG = LoggerFactory.getLogger(Neo4jTransactionManager::class.java)
    }

    class Neo4jTransaction(private val driver: Driver) {
        var session: Session? = null
        var transaction: Transaction? = null

        fun start() {
            if (session != null) {
                throw CannotCreateTransactionException("Transaction already started")
            }

            session = driver.session()
            transaction = session?.beginTransaction()
        }
    }

    override fun doCommit(status: DefaultTransactionStatus) {
        val transaction = unwrapTransaction(status)
        LOG.debug("Committing transaction: {}", transaction)

        if (transaction.transaction == null) {
            throw NoTransactionException("No current transaction")
        }
        transaction.transaction?.success()
        transaction.transaction?.close()
        transaction.session?.close()
    }

    override fun doBegin(transaction: Any, definition: TransactionDefinition) {
        (transaction as Neo4jTransaction).start()
    }

    override fun doGetTransaction(): Any {
        return Neo4jTransaction(driver)
    }

    override fun doRollback(status: DefaultTransactionStatus) {
        val transaction = unwrapTransaction(status)
        LOG.debug("Rolling back transaction: {}", transaction)

        if (transaction.transaction == null) {
            throw NoTransactionException("No current transaction")
        }
        transaction.transaction?.failure()
        transaction.transaction?.close()
        transaction.session?.close()
    }

    private fun unwrapTransaction(status: DefaultTransactionStatus) : Neo4jTransaction {
        return status.transaction as Neo4jTransaction
    }
}

@Configuration
@EnableTransactionManagement(proxyTargetClass = true, mode = AdviceMode.PROXY)
class DatabaseConfig {
.....
    @Bean("transactionManager")
    fun neo4jTransactionManager(driver: Driver) = Neo4jTransactionManager(driver)

    @Bean
    fun neo4jHealthcheck(neo4jOperations: Neo4jOperations) = Neo4jHealthcheck(neo4jOperations)

}

@Transactional
class Neo4jHealthcheck(private val neo4jOperations: Neo4jOperations) : AbstractHealthIndicator() {
    companion object {
        private const val QUERY = "MATCH (n) RETURN count(*) as count"
    }

    @Transactional
    override fun doHealthCheck(builder: Health.Builder) {
        val count = neo4jOperations.queryOne(QUERY).get("count").asInt()

        builder.up()
                .withDetail("Nodes", count)
                .build()
    }
}

我希望看到我的运行状况检查在事务内容周围发出一些日志消息，并在调试时在堆栈跟踪中看到它们。但我什么都看不到，因此几乎完全忽略了我的@Transactional注释。

我错过了什么？

欢呼

Answer 1

如我所见，Neo4jHealthcheck不是弹簧组件。因此，可能没有创建代理。

您必须将@Component或任何子类型添加到Neo4jHealthcheck

看看一个带有执行器和事务的示例：

https://github.com/simasch/actuator-transactional

@Transactional在使用自定义事务管理器的Spring Boot中不起作用

1 个答案: