org.pentaho.di.core.util

Class AsyncDatabaseAction

java.lang.Object

org.pentaho.di.core.util.AsyncDatabaseAction

public class AsyncDatabaseAction
extends Object

Static methods for asynchronous execution of actions on a Database, with a set timeout for the async thread. The .executeAction() method takes a Consumer, which defines what action to take on the Database. The .executeSql / .getTables / .getSchemas / etc. methods are convenience methods which leverage .executeAction() to retrieve specific info. These methods can be used wherever Database info needs to be retrieved without blocking the calling thread, for example with setting UI elements: AsyncDatabaseAction.getTables( dbMeta, schemaName, tables -> display.asyncExec(() -> combo.setItems(tables)) Note that the action of setting the items still needs to happen on the SWT display thread, hence the need for display.asyncExec(). So with the above two lines, AsyncDatabaseAction thread retrieves the table array from the database, When retrieved, `combo.setItems(tables)` is put on the display thread's queue.

Method Summary

Modifier and Type	Method and Description
static void	executeAction(DatabaseMeta databaseMeta, Consumer<Database> dbAction)
static void	executeSql(DatabaseMeta databaseMeta, String sql, Consumer<List<Object[]>> rowConsumer)
static void	getFields(DatabaseMeta databaseMeta, String tablename, Consumer<RowMetaInterface> fieldsConsumer)
static void	getSchemas(DatabaseMeta databaseMeta, Consumer<String[]> schemasConsumer)
static void	getTables(DatabaseMeta databaseMeta, String schema, Consumer<String[]> tablesConsumer)

Methods inherited from class java.lang.Object

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

Method Detail

executeAction

public static void executeAction(DatabaseMeta databaseMeta,
                                 Consumer<Database> dbAction)

executeSql

public static void executeSql(DatabaseMeta databaseMeta,
                              String sql,
                              Consumer<List<Object[]>> rowConsumer)

getTables

public static void getTables(DatabaseMeta databaseMeta,
                             String schema,
                             Consumer<String[]> tablesConsumer)

getSchemas

public static void getSchemas(DatabaseMeta databaseMeta,
                              Consumer<String[]> schemasConsumer)

getFields

public static void getFields(DatabaseMeta databaseMeta,
                             String tablename,
                             Consumer<RowMetaInterface> fieldsConsumer)