io.debezium.transforms.tracing

Class ActivateTracingSpan<R extends org.apache.kafka.connect.connector.ConnectRecord<R>>

java.lang.Object

io.debezium.transforms.tracing.ActivateTracingSpan<R>

Type Parameters:

R - the subtype of ConnectRecord on which this transformation will operate

All Implemented Interfaces:

Closeable, AutoCloseable, org.apache.kafka.common.Configurable, org.apache.kafka.connect.transforms.Transformation<R>

public class ActivateTracingSpan<R extends org.apache.kafka.connect.connector.ConnectRecord<R>>
extends Object
implements org.apache.kafka.connect.transforms.Transformation<R>

This SMT enables integration with a tracing system. The SMT creates a tracing span and enriches it with metadata from envelope and source info block.
It is possible to connect the span to a parent span created by a business application. The application then needs to export its tracing active span context into a database field. The SMT looks for a predefined field name in the after block and when found it extracts the parent span from it.

Author:

Jiri Pechanec

See Also:

EventDispatcher} for example of such implementation

Field Summary

Fields

Modifier and Type	Field and Description
private static String	DB_FIELDS_PREFIX
private static String	DEFAULT_TRACING_OPERATION_NAME
private static String	DEFAULT_TRACING_SPAN_CONTEXT_FIELD
private static org.slf4j.Logger	LOGGER
private String	operationName
private boolean	requireContextField
private SmtManager<R>	smtManager
private String	spanContextField
private static String	TRACING_COMPONENT
static Field	TRACING_CONTEXT_FIELD_REQUIRED
static Field	TRACING_OPERATION_NAME
static Field	TRACING_SPAN_CONTEXT_FIELD
private static String	TX_LOG_WRITE_OPERATION_NAME

Constructor Summary

Constructors

Constructor and Description
ActivateTracingSpan()

Method Summary

Modifier and Type	Method and Description
private void	addFieldToSpan(io.opentracing.Tracer.SpanBuilder span, org.apache.kafka.connect.data.Struct struct, String field, String prefix)
R	apply(R record)
void	close()
org.apache.kafka.common.config.ConfigDef	config()
void	configure(Map<String,?> props)
void	setRequireContextField(boolean requireContextField)
private R	traceRecord(R record, org.apache.kafka.connect.data.Struct envelope, org.apache.kafka.connect.data.Struct source, org.apache.kafka.connect.data.Struct after, String propagatedSpanContext)

Methods inherited from class java.lang.Object

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

Field Detail

DB_FIELDS_PREFIX

private static final String DB_FIELDS_PREFIX

See Also:

Constant Field Values

LOGGER

private static final org.slf4j.Logger LOGGER

DEFAULT_TRACING_SPAN_CONTEXT_FIELD

private static final String DEFAULT_TRACING_SPAN_CONTEXT_FIELD

See Also:

Constant Field Values

DEFAULT_TRACING_OPERATION_NAME

private static final String DEFAULT_TRACING_OPERATION_NAME

See Also:

Constant Field Values

TRACING_COMPONENT

private static final String TRACING_COMPONENT

See Also:

Constant Field Values

TX_LOG_WRITE_OPERATION_NAME

private static final String TX_LOG_WRITE_OPERATION_NAME

See Also:

Constant Field Values

TRACING_SPAN_CONTEXT_FIELD

public static final Field TRACING_SPAN_CONTEXT_FIELD

TRACING_OPERATION_NAME

public static final Field TRACING_OPERATION_NAME

TRACING_CONTEXT_FIELD_REQUIRED

public static final Field TRACING_CONTEXT_FIELD_REQUIRED

spanContextField

private String spanContextField

operationName

private String operationName

requireContextField

private boolean requireContextField

smtManager

private SmtManager<R extends org.apache.kafka.connect.connector.ConnectRecord<R>> smtManager

Constructor Detail

ActivateTracingSpan

public ActivateTracingSpan()

Method Detail

configure

public void configure(Map<String,?> props)

Specified by:

configure in interface org.apache.kafka.common.Configurable

setRequireContextField

public void setRequireContextField(boolean requireContextField)

apply

public R apply(R record)

Specified by:

apply in interface org.apache.kafka.connect.transforms.Transformation<R extends org.apache.kafka.connect.connector.ConnectRecord<R>>

traceRecord

private R traceRecord(R record,
                      org.apache.kafka.connect.data.Struct envelope,
                      org.apache.kafka.connect.data.Struct source,
                      org.apache.kafka.connect.data.Struct after,
                      String propagatedSpanContext)

close

public void close()

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in interface org.apache.kafka.connect.transforms.Transformation<R extends org.apache.kafka.connect.connector.ConnectRecord<R>>

config

public org.apache.kafka.common.config.ConfigDef config()

Specified by:

config in interface org.apache.kafka.connect.transforms.Transformation<R extends org.apache.kafka.connect.connector.ConnectRecord<R>>

addFieldToSpan

private void addFieldToSpan(io.opentracing.Tracer.SpanBuilder span,
                            org.apache.kafka.connect.data.Struct struct,
                            String field,
                            String prefix)