TxnManager (starrocks-bdb-je 18.3.17 API)

java.lang.Object
- com.sleepycat.je.txn.TxnManager

```
public class TxnManager
extends Object
```
Class to manage transactions. Basically a Set of all transactions with add and remove methods and a latch around the set.

Constructor Summary

Constructors
Constructor and Description

TxnManager(EnvironmentImpl envImpl)

Constructors
Constructor and Description
`TxnManager(EnvironmentImpl envImpl)`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`areOtherSerializableTransactionsActive(Locker excludeLocker)` Returns whether there are any active serializable transactions, excluding the transaction given (if non-null).
`long`	`getFirstActiveLsn()` Get the earliest LSN of all the active transactions, for checkpoint.
`long`	`getLastLocalTxnId()` Get the last used id, for checkpoint info.
`long`	`getLastReplicatedTxnId()`
`LockManager`	`getLockManager()` Give transactions and environment access to lock manager.
`long`	`getNextReplicatedTxnId()`
`long`	`getNTotalCommits()` Returns commit counter that is never cleared (as stats are), so it can be used for monitoring un-flushed txns.
`Transaction`	`getTxnForThread()` Retrieve a Txn object for this Thread.
`Txn`	`getTxnFromXid(Xid xid)` Retrieve a Txn object from an Xid.
`<T extends Txn> Set<T>`	`getTxns(Class<T> txnClass)` Examine the transaction set and return Txn that match the class or are subclasses of that class.
`static boolean`	`isReplicatedTxn(long txnId)`
`StatGroup`	`loadStats(StatsConfig config)`
`LockStats`	`lockStat(StatsConfig config)` Collect lock related stats.
`void`	`notePrepare()` Called when XATransaction is prepared.
`void`	`registerTxn(Txn txn)` Called when txn is created.
`void`	`registerXATxn(Xid xid, Txn txn, boolean isPrepare)` Called when txn is created.
`void`	`setLastTxnId(long lastReplicatedTxnId, long lastLocalId)` Set the txn id sequence.
`void`	`setTxnForThread(Transaction txn)` Called when txn is assoc'd with this thread.
`Txn`	`txnBegin(Transaction parent, TransactionConfig txnConfig)` Create a new transaction.
`TransactionStats`	`txnStat(StatsConfig config)` Collect transaction related stats.
`Transaction`	`unsetTxnForThread()` Called when txn is assoc'd with this thread.
`void`	`updateFromReplay(long replayTxnId)`
`Xid[]`	`XARecover()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - TxnManager
```
public TxnManager(EnvironmentImpl envImpl)
```
- Method Detail
  - setLastTxnId
```
public void setLastTxnId(long lastReplicatedTxnId,
                         long lastLocalId)
```
    Set the txn id sequence.
  - getLastLocalTxnId
```
public long getLastLocalTxnId()
```
    Get the last used id, for checkpoint info.
  - getLastReplicatedTxnId
```
public long getLastReplicatedTxnId()
```
  - getNextReplicatedTxnId
```
public long getNextReplicatedTxnId()
```
  - isReplicatedTxn
```
public static boolean isReplicatedTxn(long txnId)
```
  - updateFromReplay
```
public void updateFromReplay(long replayTxnId)
```
  - getNTotalCommits
```
public long getNTotalCommits()
```
    Returns commit counter that is never cleared (as stats are), so it can be used for monitoring un-flushed txns.
  - txnBegin
```
public Txn txnBegin(Transaction parent,
                    TransactionConfig txnConfig)
             throws DatabaseException
```
    Create a new transaction.
    
    Parameters:
    
    parent - for nested transactions, not yet supported
    
    txnConfig - specifies txn attributes
    
    Returns:
    
    the new txn
    
    Throws:
    
    DatabaseException
  - getLockManager
```
public LockManager getLockManager()
```
    Give transactions and environment access to lock manager.
  - registerTxn
```
public void registerTxn(Txn txn)
```
    Called when txn is created.
  - registerXATxn
```
public void registerXATxn(Xid xid,
                          Txn txn,
                          boolean isPrepare)
```
    Called when txn is created.
  - notePrepare
```
public void notePrepare()
```
    Called when XATransaction is prepared.
  - getTxnFromXid
```
public Txn getTxnFromXid(Xid xid)
```
    Retrieve a Txn object from an Xid.
  - setTxnForThread
```
public void setTxnForThread(Transaction txn)
```
    Called when txn is assoc'd with this thread.
  - unsetTxnForThread
```
public Transaction unsetTxnForThread()
```
    Called when txn is assoc'd with this thread.
  - getTxnForThread
```
public Transaction getTxnForThread()
```
    Retrieve a Txn object for this Thread.
  - XARecover
```
public Xid[] XARecover()
```
  - areOtherSerializableTransactionsActive
```
public boolean areOtherSerializableTransactionsActive(Locker excludeLocker)
```
    Returns whether there are any active serializable transactions, excluding the transaction given (if non-null). This is intentionally returned without latching, since latching would not make the act of reading an integer more atomic than it already is.
  - getFirstActiveLsn
```
public long getFirstActiveLsn()
```
    Get the earliest LSN of all the active transactions, for checkpoint. Returns NULL_LSN is no transaction is currently active.
  - txnStat
```
public TransactionStats txnStat(StatsConfig config)
```
    Collect transaction related stats.
  - loadStats
```
public StatGroup loadStats(StatsConfig config)
```
  - lockStat
```
public LockStats lockStat(StatsConfig config)
                   throws DatabaseException
```
    Collect lock related stats.
    
    Throws:
    
    DatabaseException
  - getTxns
```
public <T extends Txn> Set<T> getTxns(Class<T> txnClass)
```
    Examine the transaction set and return Txn that match the class or are subclasses of that class. This method is used to obtain Master and Replay TXns for HA

Class TxnManager

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

TxnManager

Method Detail

setLastTxnId

getLastLocalTxnId

getLastReplicatedTxnId

getNextReplicatedTxnId

isReplicatedTxn

updateFromReplay

getNTotalCommits

txnBegin

getLockManager

registerTxn

registerXATxn

notePrepare

getTxnFromXid

setTxnForThread

unsetTxnForThread

getTxnForThread

XARecover

areOtherSerializableTransactionsActive

getFirstActiveLsn

txnStat

loadStats

lockStat

getTxns