```
public interface InternalTaskanaEngine
```
FOR INTERNAL USE ONLY.
Contains all actions which are necessary within taskana.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`boolean`	`domainExists(String domain)`	Returns true if the given domain does exist in the configuration.
`default void`	`executeInDatabaseConnection(Runnable runnable)`	Executes the given runnable after openConnection is called and then returns the connection.
`<T> T`	`executeInDatabaseConnection(Supplier<T> supplier)`	Executes the given supplier after openConnection is called and then returns the connection.
`AfterRequestChangesManager`	`getAfterRequestChangesManager()`	Retrieves the AfterRequestChangesManager.
`AfterRequestReviewManager`	`getAfterRequestReviewManager()`	Retrieves the AfterRequestReviewManager.
`BeforeRequestChangesManager`	`getBeforeRequestChangesManager()`	Retrieves the BeforeRequestChangesManager.
`BeforeRequestReviewManager`	`getBeforeRequestReviewManager()`	Retrieves the BeforeRequestReviewManager.
`CreateTaskPreprocessorManager`	`getCreateTaskPreprocessorManager()`	Retrieve CreateTaskPreprocessorManager.
`TaskanaEngine`	`getEngine()`	Retrieve TaskanaEngine.
`HistoryEventManager`	`getHistoryEventManager()`	Retrieve HistoryEventProducer.
`PriorityServiceManager`	`getPriorityServiceManager()`	Retrieves the PriorityServiceManager.
`ReviewRequiredManager`	`getReviewRequiredManager()`	Retrieves the ReviewRequiredManager.
`org.apache.ibatis.session.SqlSession`	`getSqlSession()`	retrieve the SqlSession used by taskana.
`TaskRoutingManager`	`getTaskRoutingManager()`	Retrieve TaskRoutingProducer.
`void`	`initSqlSession()`	Initializes the SqlSessionManager.
`void`	`openConnection()`	Opens the connection to the database.
`void`	`returnConnection()`	Returns the database connection into the pool.

- Method Detail
  - openConnection
```
void openConnection()
```
    Opens the connection to the database. Has to be called at the beginning of each Api call that accesses the database
  - returnConnection
```
void returnConnection()
```
    Returns the database connection into the pool. In the case of nested calls, simply pops the latest session from the session stack. Closes the connection if the session stack is empty. In mode AUTOCOMMIT commits before the connection is closed. To be called at the end of each Api call that accesses the database
  - executeInDatabaseConnection
```
<T> T executeInDatabaseConnection(Supplier<T> supplier)
```
    Executes the given supplier after openConnection is called and then returns the connection.
    
    Type Parameters:
    
    T - any type
    
    Parameters:
    
    supplier - a function that returns something of type T
    
    Returns:
    
    the result of the supplier
  - executeInDatabaseConnection
```
default void executeInDatabaseConnection(Runnable runnable)
```
    Executes the given runnable after openConnection is called and then returns the connection.
    
    See Also:
    
    executeInDatabaseConnection(Supplier)
  - initSqlSession
```
void initSqlSession()
```
    Initializes the SqlSessionManager.
  - domainExists
```
boolean domainExists(String domain)
```
    Returns true if the given domain does exist in the configuration.
    
    Parameters:
    
    domain - the domain specified in the configuration
    
    Returns:
    
    true if the domain exists
  - getSqlSession
```
org.apache.ibatis.session.SqlSession getSqlSession()
```
    retrieve the SqlSession used by taskana.
    
    Returns:
    
    the myBatis SqlSession object used by taskana
  - getEngine
```
TaskanaEngine getEngine()
```
    Retrieve TaskanaEngine.
    
    Returns:
    
    The nested TaskanaEngine.
  - getHistoryEventManager
```
HistoryEventManager getHistoryEventManager()
```
    Retrieve HistoryEventProducer.
    
    Returns:
    
    the HistoryEventProducer instance.
  - getTaskRoutingManager
```
TaskRoutingManager getTaskRoutingManager()
```
    Retrieve TaskRoutingProducer.
    
    Returns:
    
    the TaskRoutingProducer instance.
  - getCreateTaskPreprocessorManager
```
CreateTaskPreprocessorManager getCreateTaskPreprocessorManager()
```
    Retrieve CreateTaskPreprocessorManager.
    
    Returns:
    
    the CreateTaskPreprocessorManager instance.
  - getPriorityServiceManager
```
PriorityServiceManager getPriorityServiceManager()
```
    Retrieves the PriorityServiceManager.
    
    Returns:
    
    the PriorityServiceManager instance
  - getReviewRequiredManager
```
ReviewRequiredManager getReviewRequiredManager()
```
    Retrieves the ReviewRequiredManager.
    
    Returns:
    
    the ReviewRequiredManager instance
  - getBeforeRequestReviewManager
```
BeforeRequestReviewManager getBeforeRequestReviewManager()
```
    Retrieves the BeforeRequestReviewManager.
    
    Returns:
    
    the BeforeRequestReviewManager instance
  - getAfterRequestReviewManager
```
AfterRequestReviewManager getAfterRequestReviewManager()
```
    Retrieves the AfterRequestReviewManager.
    
    Returns:
    
    the AfterRequestReviewManager instance
  - getBeforeRequestChangesManager
```
BeforeRequestChangesManager getBeforeRequestChangesManager()
```
    Retrieves the BeforeRequestChangesManager.
    
    Returns:
    
    the BeforeRequestChangesManager instance
  - getAfterRequestChangesManager
```
AfterRequestChangesManager getAfterRequestChangesManager()
```
    Retrieves the AfterRequestChangesManager.
    
    Returns:
    
    the AfterRequestChangesManager instance

Interface InternalTaskanaEngine

Method Summary

Method Detail

openConnection

returnConnection

executeInDatabaseConnection

executeInDatabaseConnection

initSqlSession

domainExists

getSqlSession

getEngine

getHistoryEventManager

getTaskRoutingManager

getCreateTaskPreprocessorManager

getPriorityServiceManager

getReviewRequiredManager

getBeforeRequestReviewManager

getAfterRequestReviewManager

getBeforeRequestChangesManager

getAfterRequestChangesManager