Jsr223Engine (Debezium Scripting 1.7.1.Final API)

java.lang.Object
- io.debezium.transforms.scripting.Jsr223Engine

All Implemented Interfaces:

Engine

Direct Known Subclasses:

GraalJsEngine
```
public class Jsr223Engine
extends Object
implements Engine
```
An implementation of the expression language evaluator based on JSR 223 scripting languages. The expression receives variables to work with
- key - key of the record
- value - value of the record
- keySchema - schema for key
- valueSchema - schema for value
Author:

Jiri Pechanec

Field Summary

Fields
Modifier and Type Field Description

protected ScriptEngine engine

private String expression

private CompiledScript script

Constructor Summary

Constructors
Constructor Description

Jsr223Engine()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`configure(String language, String expression)`	Pre-compiles the expression for repeated execution.
`protected void`	`configureEngine()`
`protected Map<String,RecordHeader>`	`doHeaders(org.apache.kafka.connect.connector.ConnectRecord<?> record)`
`<T> T`	`eval(org.apache.kafka.connect.connector.ConnectRecord<?> record, Class<T> type)`	Calculate a value out of the record.
`protected Bindings`	`getBindings(org.apache.kafka.connect.connector.ConnectRecord<?> record)`
`protected RecordHeader`	`header(org.apache.kafka.connect.header.Header header)`
`protected Object`	`headers(org.apache.kafka.connect.connector.ConnectRecord<?> record)`
`protected Object`	`key(org.apache.kafka.connect.connector.ConnectRecord<?> record)`
`protected Object`	`value(org.apache.kafka.connect.connector.ConnectRecord<?> record)`

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

Field Detail

expression
```
private String expression
```

script
```
private CompiledScript script
```

engine
```
protected ScriptEngine engine
```

Constructor Detail
- Jsr223Engine
```
public Jsr223Engine()
```

Method Detail

configure
```
public void configure(String language,
                      String expression)
```
Description copied from interface: Engine

Pre-compiles the expression for repeated execution. The method is called once upon the engine initialization.

Specified by:

configure in interface Engine

configureEngine
```
protected void configureEngine()
```

getBindings

protected Bindings getBindings(org.apache.kafka.connect.connector.ConnectRecord<?> record)

key

protected Object key(org.apache.kafka.connect.connector.ConnectRecord<?> record)

value

protected Object value(org.apache.kafka.connect.connector.ConnectRecord<?> record)

header

protected RecordHeader header(org.apache.kafka.connect.header.Header header)

headers

protected Object headers(org.apache.kafka.connect.connector.ConnectRecord<?> record)

doHeaders

protected Map<String,RecordHeader> doHeaders(org.apache.kafka.connect.connector.ConnectRecord<?> record)

eval
```
public <T> T eval(org.apache.kafka.connect.connector.ConnectRecord<?> record,
                  Class<T> type)
```
Description copied from interface: Engine

Calculate a value out of the record.

Specified by:

eval in interface Engine

Parameters:

record - to be used

Returns:

result of calculation