com.espertech.esper.epl.db

Interface DatabaseConfigService

All Known Implementing Classes:

DatabaseConfigServiceImpl

public interface DatabaseConfigService

Service providing database connection factory and configuration information for use with historical data polling.

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.

Method Detail

getConnectionFactory

DatabaseConnectionFactory getConnectionFactory(String databaseName)
                                        throws DatabaseConfigException

Returns a connection factory for a configured database.

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

getQuerySetting

ColumnSettings getQuerySetting(String databaseName)
                        throws DatabaseConfigException

Returns the column metadata settings for the database.

Parameters:

databaseName - is the database name

Returns:

indicators for change case, metadata retrieval strategy and others

Throws:

DatabaseConfigException - if the name was not configured

getConnectionCache

ConnectionCache getConnectionCache(String databaseName,
                                   String preparedStatementText)
                            throws DatabaseConfigException

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

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

getDataCache

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

Returns a new cache implementation for this database.

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