org.apache.hadoop.hive.metastore.txn

Class TxnStoreMutex

java.lang.Object

org.apache.hadoop.hive.metastore.txn.TxnStoreMutex

All Implemented Interfaces:

TxnStore.MutexAPI

public class TxnStoreMutex
extends Object
implements TxnStore.MutexAPI

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	TxnStoreMutex.LockHandleImpl

Nested classes/interfaces inherited from interface org.apache.hadoop.hive.metastore.txn.TxnStore.MutexAPI

TxnStore.MutexAPI.LockHandle

Constructor Summary

Constructors

Constructor and Description
TxnStoreMutex(SQLGenerator sqlGenerator, MultiDataSourceJdbcResource jdbcResource)

Method Summary

Modifier and Type	Method and Description
TxnStore.MutexAPI.LockHandle	acquireLock(String key) The key is name of the lock.
void	acquireLock(String key, TxnStore.MutexAPI.LockHandle handle) Same as TxnStore.MutexAPI.acquireLock(String) but takes an already existing handle as input.

Methods inherited from class java.lang.Object

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

Constructor Detail

TxnStoreMutex

public TxnStoreMutex(SQLGenerator sqlGenerator,
                     MultiDataSourceJdbcResource jdbcResource)

Method Detail

acquireLock

public TxnStore.MutexAPI.LockHandle acquireLock(String key)
                                         throws MetaException

Description copied from interface: TxnStore.MutexAPI

The key is name of the lock. Will acquire an exclusive lock or block. It returns a handle which must be used to release the lock. Each invocation returns a new handle.

Specified by:

acquireLock in interface TxnStore.MutexAPI

Throws:

MetaException

acquireLock

public void acquireLock(String key,
                        TxnStore.MutexAPI.LockHandle handle)
                 throws MetaException

Description copied from interface: TxnStore.MutexAPI

Same as TxnStore.MutexAPI.acquireLock(String) but takes an already existing handle as input. This will associate the lock on key with the same handle. All locks associated with the same handle will be released together.

Specified by:

acquireLock in interface TxnStore.MutexAPI

handle - not NULL

Throws:

MetaException