Package ch.admin.bit.jeap.db.tx

Class ReadReplicaAwareTransactionManager

java.lang.Object

ch.admin.bit.jeap.db.tx.ReadReplicaAwareTransactionManager

All Implemented Interfaces:

org.springframework.transaction.PlatformTransactionManager, org.springframework.transaction.TransactionManager

public class ReadReplicaAwareTransactionManager
extends Object
implements org.springframework.transaction.PlatformTransactionManager

This transaction manager keeps track of the readOnly value of top level transactions and sets this value to a ThreadLocal, which can be used somewhere else, for instance by ReadReplicaAwareTransactionRoutingDataSource to route to the corresponding datasource.

This manager acts as a wrapper of a PlatformTransactionManager, delegating all transaction handling operations to it.

In addition to that, it checks the readOnly value of nested transactions and forbids creating a non-readonly transaction inside a top-level read-only one. This check preemptively avoids usage of nested transaction definitions not suitable for AWS RDS with "reader" endpoints.

See Also:

• AWS documentation

Constructor Summary

Constructors

Constructor	Description
ReadReplicaAwareTransactionManager(org.springframework.transaction.PlatformTransactionManager delegate, boolean routeTransactionsToReadReplica, Supplier<io.micrometer.core.instrument.MeterRegistry> meterRegistrySupplier)

Method Summary

Modifier and Type	Method	Description
void	commit(org.springframework.transaction.TransactionStatus status)
org.springframework.transaction.TransactionStatus	getTransaction(org.springframework.transaction.TransactionDefinition definition)
boolean	isRouteTransactionsToReadReplica()
void	rollback(org.springframework.transaction.TransactionStatus status)
static boolean	routeTopLevelTransactionToReadReplica()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ReadReplicaAwareTransactionManager

public ReadReplicaAwareTransactionManager(org.springframework.transaction.PlatformTransactionManager delegate,
 boolean routeTransactionsToReadReplica,
 Supplier<io.micrometer.core.instrument.MeterRegistry> meterRegistrySupplier)

Method Details

getTransaction

public org.springframework.transaction.TransactionStatus getTransaction(org.springframework.transaction.TransactionDefinition definition)
                                                                 throws org.springframework.transaction.TransactionException

Specified by:

getTransaction in interface org.springframework.transaction.PlatformTransactionManager

Throws:

org.springframework.transaction.TransactionException

commit

public void commit(org.springframework.transaction.TransactionStatus status)
            throws org.springframework.transaction.TransactionException

Specified by:

commit in interface org.springframework.transaction.PlatformTransactionManager

Throws:

org.springframework.transaction.TransactionException

rollback

public void rollback(org.springframework.transaction.TransactionStatus status)
              throws org.springframework.transaction.TransactionException

Specified by:

rollback in interface org.springframework.transaction.PlatformTransactionManager

Throws:

org.springframework.transaction.TransactionException

routeTopLevelTransactionToReadReplica

public static boolean routeTopLevelTransactionToReadReplica()

isRouteTransactionsToReadReplica

public boolean isRouteTransactionsToReadReplica()