PreparedEventExpressionTemplate (Apama API Documentation 10.15.1.2)

java.lang.Object
- com.apama.jmon.PreparedEventExpressionTemplate

All Implemented Interfaces:

java.io.Serializable
```
public class PreparedEventExpressionTemplate
extends java.lang.Object
implements java.io.Serializable
```
Instances of this class are declared to represent templates for "Prepared Event Expressions". These are similar in concept to SQL prepared statements, in that they allow a monitor to declare a parameterised event expression that can then be "instantiated" as many times as necessary with different parameter values. The advantage of this approach over standard event expressions is that the expression is only parsed once, when the template is created. Instantiating the template with some set of parameters is then a relatively cheap operation. Standard event expressions will be parsed every time a listener is attached to them, which can be inefficient in monitors that create large numbers of listeners.

See the documentation for PreparedEventExpression for examples of how this class is used.

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor	Description
`PreparedEventExpressionTemplate(java.lang.String templateString)`	Constructor to create a new instance with the given immutable expression template string.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`PreparedEventExpression`	`getInstance()`	Create a new instance of the event expression template.
`java.lang.String`	`getTemplateString()`	Get the String value of the PreparedEventExpressionTemplate.
`java.lang.String`	`toString()`

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - PreparedEventExpressionTemplate
```
public PreparedEventExpressionTemplate(java.lang.String templateString)
```
    Constructor to create a new instance with the given immutable expression template string.
    
    Parameters:
    
    templateString - The event expression template to be used.
- Method Detail
  - getTemplateString
```
public java.lang.String getTemplateString()
```
    Get the String value of the PreparedEventExpressionTemplate.
    
    Returns:
    
    value of the PreparedEventExpressionTemplate.
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object
    
    See Also:
    
    getTemplateString()
  - getInstance
```
public PreparedEventExpression getInstance()
```
    Create a new instance of the event expression template.
    
    Returns:
    
    A new event expression created from the template, ready to have its parameter values filled in.