Package org.apache.skywalking.apm.toolkit.trace

Class TraceContext

java.lang.Object

org.apache.skywalking.apm.toolkit.trace.TraceContext

public class TraceContext
extends Object

Try to access the sky-walking tracer context. The context is not existed, always. only the middleware, component, or rpc-framework are supported in the current invoke stack, in the same thread, the context will be available.

Constructor Summary

Constructors

Constructor	Description
TraceContext()

Method Summary

Modifier and Type	Method	Description
static Optional<String>	getCorrelation(String key)	Try to get the custom value from trace context.
static Optional<String>	putCorrelation(String key, String value)	Put the custom key/value into trace context.
static String	segmentId()	Try to get the segmentId of current trace context.
static int	spanId()	Try to get the spanId of current trace context.
static String	traceId()	Try to get the traceId of current trace context.

Methods inherited from class java.lang.Object

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

Constructor Details

TraceContext

public TraceContext()

Method Details

traceId

public static String traceId()

Try to get the traceId of current trace context.

Returns:

traceId, if it exists, or empty String.

segmentId

public static String segmentId()

Try to get the segmentId of current trace context.

Returns:

segmentId, if it exists, or empty String.

spanId

public static int spanId()

Try to get the spanId of current trace context. The spanId is a negative number when the trace context is missing.

Returns:

spanId, if it exists, or empty String.

getCorrelation

public static Optional<String> getCorrelation(String key)

Try to get the custom value from trace context.

Returns:

custom data value.

putCorrelation

public static Optional<String> putCorrelation(String key,
 String value)

Put the custom key/value into trace context.

Returns:

previous value if it exists.