com.espertech.esper.client.hook

Class VirtualDataWindowContext

java.lang.Object

com.espertech.esper.client.hook.VirtualDataWindowContext

public class VirtualDataWindowContext
extends Object

Context for use with virtual data window factory VirtualDataWindowFactory provides contextual information about the named window and the type of events held, handle for posting insert and remove streams and factory for event bean instances.

Constructor Summary

Constructors

Constructor and Description
VirtualDataWindowContext(AgentInstanceContext agentInstanceContext, EventType eventType, Object[] parameters, ExprNode[] parameterExpressions, EventBeanFactory eventFactory, VirtualDataWindowOutStream outputStream, String namedWindowName, ViewFactoryContext viewFactoryContext, Serializable customConfiguration) Ctor.

Method Summary

Modifier and Type	Method and Description
AgentInstanceContext	getAgentInstanceContext() Returns the agent instance (context partition) context.
Serializable	getCustomConfiguration() Returns any additional configuration provided.
EventBeanFactory	getEventFactory() Returns the factory for creating instances of EventBean from rows.
EventType	getEventType() Returns the event type of the events held in the virtual data window as per declaration of the named window.
String	getNamedWindowName() Returns the name of the named window used in connection with the virtual data window.
VirtualDataWindowOutStream	getOutputStream() Returns a handle for use to send insert and remove stream data to consuming statements.
ExprNode[]	getParameterExpressions() Returns the expressions passed as parameters to the virtual data window.
Object[]	getParameters() Returns the parameters passed; for example "create window ABC.my:vdw("10.0.0.1")" passes one paramater here.
StatementContext	getStatementContext() Returns the statement context which holds statement information (name, expression, id) and statement-level services.
ViewFactoryContext	getViewFactoryContext() Returns the engine services context.

Methods inherited from class java.lang.Object

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

Constructor Detail

VirtualDataWindowContext

public VirtualDataWindowContext(AgentInstanceContext agentInstanceContext,
                                EventType eventType,
                                Object[] parameters,
                                ExprNode[] parameterExpressions,
                                EventBeanFactory eventFactory,
                                VirtualDataWindowOutStream outputStream,
                                String namedWindowName,
                                ViewFactoryContext viewFactoryContext,
                                Serializable customConfiguration)

Ctor.

Parameters:

agentInstanceContext - statement services and statement information such as statement name, statement id, EPL expression

eventType - the event type that the named window is declared to hold.

parameters - the parameters passed when declaring the named window, for example "create window ABC.my:vdw("10.0.0.1")" passes one paramater here.

eventFactory - factory for converting row objects to EventBean instances

outputStream - forward the input and output stream received from the update method here

namedWindowName - the name of the named window

parameterExpressions - parameter expressions passed to the virtual data window

viewFactoryContext - context of services

customConfiguration - additional configuration

Method Detail

getStatementContext

public StatementContext getStatementContext()

Returns the statement context which holds statement information (name, expression, id) and statement-level services.

Returns:

statement context

getEventType

public EventType getEventType()

Returns the event type of the events held in the virtual data window as per declaration of the named window.

Returns:

event type

getParameters

public Object[] getParameters()

Returns the parameters passed; for example "create window ABC.my:vdw("10.0.0.1")" passes one paramater here.

Returns:

parameters

getEventFactory

public EventBeanFactory getEventFactory()

Returns the factory for creating instances of EventBean from rows.

Returns:

event bean factory

getOutputStream

public VirtualDataWindowOutStream getOutputStream()

Returns a handle for use to send insert and remove stream data to consuming statements.

Typically use "context.getOutputStream().update(newData, oldData);" in the update method of the virtual data window.

Returns:

handle for posting insert and remove stream

getNamedWindowName

public String getNamedWindowName()

Returns the name of the named window used in connection with the virtual data window.

Returns:

named window

getParameterExpressions

public ExprNode[] getParameterExpressions()

Returns the expressions passed as parameters to the virtual data window.

Returns:

parameter expressions

getViewFactoryContext

public ViewFactoryContext getViewFactoryContext()

Returns the engine services context.

Returns:

engine services context

getCustomConfiguration

public Serializable getCustomConfiguration()

Returns any additional configuration provided.

Returns:

additional config

getAgentInstanceContext

public AgentInstanceContext getAgentInstanceContext()

Returns the agent instance (context partition) context.

Returns:

context