TransactionStateUpdater (NanoDB SQL Relational Database 0.1-SNAPSHOT API)

java.lang.Object
- edu.caltech.nanodb.transactions.TransactionStateUpdater

All Implemented Interfaces:

CommandEventListener
```
public class TransactionStateUpdater
extends java.lang.Object
implements CommandEventListener
```
This implementation of the CommandEventListener interface manages the transaction state enclosing each command executed by the database. This includes starting a transaction before each command, if one is not already in progress, and committing the transaction if it was not user-initiated.

Field Summary

Fields
Modifier and Type	Field	Description
`private static org.apache.logging.log4j.Logger`	`logger`	A logging object for reporting anything interesting that happens.
`private TransactionManager`	`transactionManager`

Constructor Summary

Constructors
Constructor Description

TransactionStateUpdater(TransactionManager transactionManager)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`afterCommandExecuted(Command cmd)`	This method is called after a command is executed, to allow listeners to perform after-command processing.
`void`	`beforeCommandExecuted(Command cmd)`	This method is called before a command is executed, to allow listeners to perform before-command processing.

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

- Field Detail
  - logger
```
private static org.apache.logging.log4j.Logger logger
```
    A logging object for reporting anything interesting that happens.
  - transactionManager
```
private TransactionManager transactionManager
```
- Constructor Detail
  - TransactionStateUpdater
```
public TransactionStateUpdater(TransactionManager transactionManager)
```
- Method Detail
  - beforeCommandExecuted
```
public void beforeCommandExecuted(Command cmd)
                           throws EventDispatchException
```
    Description copied from interface: CommandEventListener
    
    This method is called before a command is executed, to allow listeners to perform before-command processing.
    
    Specified by:
    
    beforeCommandExecuted in interface CommandEventListener
    
    Parameters:
    
    cmd - the command about to be executed
    
    Throws:
    
    EventDispatchException
  - afterCommandExecuted
```
public void afterCommandExecuted(Command cmd)
                          throws EventDispatchException
```
    Description copied from interface: CommandEventListener
    
    This method is called after a command is executed, to allow listeners to perform after-command processing.
    
    Specified by:
    
    afterCommandExecuted in interface CommandEventListener
    
    Parameters:
    
    cmd - the command that was just executed
    
    Throws:
    
    EventDispatchException