com.espertech.esper.epl.db

Class DatabaseConfigServiceImpl

java.lang.Object

com.espertech.esper.epl.db.DatabaseConfigServiceImpl

All Implemented Interfaces:

DatabaseConfigService

public class DatabaseConfigServiceImpl
extends Object
implements DatabaseConfigService

Implementation provides database instance services such as connection factory and connection settings.

Constructor Summary

Constructors

Constructor and Description
DatabaseConfigServiceImpl(Map<String,ConfigurationDBRef> mapDatabaseRef, SchedulingService schedulingService, ScheduleBucket scheduleBucket, EngineImportService engineImportService) Ctor.

Method Summary

Modifier and Type	Method and Description
ConnectionCache	getConnectionCache(String databaseName, String preparedStatementText) Returns true to indicate a setting to retain connections between lookups.
DatabaseConnectionFactory	getConnectionFactory(String databaseName) Returns a connection factory for a configured database.
DataCache	getDataCache(String databaseName, StatementContext statementContext, EPStatementAgentInstanceHandle epStatementAgentInstanceHandle, DataCacheFactory dataCacheFactory, int streamNumber) Returns a new cache implementation for this database.
ColumnSettings	getQuerySetting(String databaseName) Returns the column metadata settings for the database.

Methods inherited from class java.lang.Object

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

Constructor Detail

DatabaseConfigServiceImpl

public DatabaseConfigServiceImpl(Map<String,ConfigurationDBRef> mapDatabaseRef,
                                 SchedulingService schedulingService,
                                 ScheduleBucket scheduleBucket,
                                 EngineImportService engineImportService)

Ctor.

Parameters:

mapDatabaseRef - is a map of database name and database configuration entries

schedulingService - is for scheduling callbacks for a cache

scheduleBucket - is a system bucket for all scheduling callbacks for caches

engineImportService - engine imports

Method Detail

getConnectionCache

public ConnectionCache getConnectionCache(String databaseName,
                                          String preparedStatementText)
                                   throws DatabaseConfigException

Description copied from interface: DatabaseConfigService

Returns true to indicate a setting to retain connections between lookups.

Specified by:

getConnectionCache in interface DatabaseConfigService

Parameters:

databaseName - is the name of the database

preparedStatementText - is the sql text

Returns:

a cache implementation to cache connection and prepared statements

Throws:

DatabaseConfigException - is thrown to indicate database configuration errors

getConnectionFactory

public DatabaseConnectionFactory getConnectionFactory(String databaseName)
                                               throws DatabaseConfigException

Description copied from interface: DatabaseConfigService

Returns a connection factory for a configured database.

Specified by:

getConnectionFactory in interface DatabaseConfigService

Parameters:

databaseName - is the name of the database

Returns:

is a connection factory to use to get connections to the database

Throws:

DatabaseConfigException - is thrown to indicate database configuration errors

getDataCache

public DataCache getDataCache(String databaseName,
                              StatementContext statementContext,
                              EPStatementAgentInstanceHandle epStatementAgentInstanceHandle,
                              DataCacheFactory dataCacheFactory,
                              int streamNumber)
                       throws DatabaseConfigException

Description copied from interface: DatabaseConfigService

Returns a new cache implementation for this database.

Specified by:

getDataCache in interface DatabaseConfigService

Parameters:

databaseName - is the name of the database to return a new cache implementation for for

statementContext - statement context

epStatementAgentInstanceHandle - is the statements-own handle for use in registering callbacks with services

dataCacheFactory - factory for cache

streamNumber - stream number

Returns:

cache implementation

Throws:

DatabaseConfigException - is thrown to indicate database configuration errors

getQuerySetting

public ColumnSettings getQuerySetting(String databaseName)
                               throws DatabaseConfigException

Description copied from interface: DatabaseConfigService

Returns the column metadata settings for the database.

Specified by:

getQuerySetting in interface DatabaseConfigService

Parameters:

databaseName - is the database name

Returns:

indicators for change case, metadata retrieval strategy and others

Throws:

DatabaseConfigException - if the name was not configured