Package com.espertech.esper.common.internal.epl.variable.core

Interface VariableStateNonConstHandler

public interface VariableStateNonConstHandler

Interface for a plug-in to VariableManagementService to handle variable persistent state.

Method Summary

Modifier and Type	Method	Description
void	addVariable(String deploymentId, String variableName, Variable variable, DataInputOutputSerde serde)
NullableObject<Object>	getHasState(Variable variable, int agentInstanceId)	Returns the current variable state plus Boolean.TRUE if there is a current state since the variable may have the value of null; returns Boolean.FALSE and null if there is no current state
void	removeState(Variable variable, int agentInstanceId)
void	removeVariable(Variable variable, String deploymentId, Set<Integer> cps)
void	setState(Variable variable, int agentInstanceId, Object newValue)	Sets the new variable value

Method Details

addVariable

void addVariable(String deploymentId,
 String variableName,
 Variable variable,
 DataInputOutputSerde serde)

getHasState

NullableObject<Object> getHasState(Variable variable,
 int agentInstanceId)

Returns the current variable state plus Boolean.TRUE if there is a current state since the variable may have the value of null; returns Boolean.FALSE and null if there is no current state

Parameters:

variable - variable

agentInstanceId - agent instance id

Returns:

indicator whether the variable is known and it's state, or whether it doesn't have state (false)

setState

void setState(Variable variable,
 int agentInstanceId,
 Object newValue)

Sets the new variable value

Parameters:

variable - variable

agentInstanceId - agent instance id

newValue - new variable value, null values allowed

removeState

void removeState(Variable variable,
 int agentInstanceId)

removeVariable

void removeVariable(Variable variable,
 String deploymentId,
 Set<Integer> cps)