org.apache.hadoop.hive.metastore.txn

Class TransactionalRetryProxy<T>

java.lang.Object

org.apache.hadoop.hive.metastore.txn.TransactionalRetryProxy<T>

All Implemented Interfaces:

InvocationHandler

public class TransactionalRetryProxy<T>
extends Object
implements InvocationHandler

Responsible for proxying an interface, and calling its methods by processing the following annotations: SqlRetry and Transactional. The annotated methods will be called accordingly:

• SQL errors in methods annotated with SqlRetry will be caught and the method will be re-executed
• Methods annotated with Transactional will be executed after creating a transaction, and all operations done via MultiDataSourceJdbcResource will use the created transaction.
• In case a method is annotated with both annotations, the transaction will be inside the retry-call. This means in case of SQL errors and retries, the transaction will be rolled back and a new one will be created for each retry attempt.

Not annotated methods are called directly.

Method Summary

Modifier and Type	Method and Description
static <T> T	getProxy(SqlRetryHandler sqlRetryHandler, MultiDataSourceJdbcResource jdbcResourceHandler, T interfaceObject) Gets the proxy interface for the given TxnStore.
Object	invoke(Object proxy, Method method, Object[] args)

Methods inherited from class java.lang.Object

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

Method Detail

getProxy

public static <T> T getProxy(SqlRetryHandler sqlRetryHandler,
                             MultiDataSourceJdbcResource jdbcResourceHandler,
                             T interfaceObject)

Gets the proxy interface for the given TxnStore.

Parameters:

sqlRetryHandler - Responsible to re-execute the methods in case of failure.

interfaceObject - The real object to proxy.

Returns:

Returns the proxy object capable of retrying the failed calls automatically and transparently.

invoke

public Object invoke(Object proxy,
                     Method method,
                     Object[] args)
              throws Throwable

Specified by:

invoke in interface InvocationHandler

Throws:

Throwable