Link

java.lang.Object
- io.opencensus.trace.Link

Direct Known Subclasses:

AutoValue_Link
```
@Immutable
public abstract class Link
extends java.lang.Object
```
A link to a Span from a different trace.
It requires a Link.Type which describes the relationship with the linked Span and the identifiers of the linked Span.
Used (for example) in batching operations, where a single batch handler processes multiple requests from different traces.

Since:

0.5

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class Link.Type
The relationship with the linked Span relative to the current Span.

Field Summary

Fields
Modifier and Type Field Description

private static java.util.Map<java.lang.String,AttributeValue> EMPTY_ATTRIBUTES

Constructor Summary

Constructors
Constructor Description

Link()

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`static Link`	`fromSpanContext(SpanContext context, Link.Type type)`	Returns a new `Link`.
`static Link`	`fromSpanContext(SpanContext context, Link.Type type, java.util.Map<java.lang.String,AttributeValue> attributes)`	Returns a new `Link`.
`abstract java.util.Map<java.lang.String,AttributeValue>`	`getAttributes()`	Returns the set of attributes.
`abstract SpanId`	`getSpanId()`	Returns the `SpanId`.
`abstract TraceId`	`getTraceId()`	Returns the `TraceId`.
`abstract Link.Type`	`getType()`	Returns the `Type`.

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

Field Detail

EMPTY_ATTRIBUTES

private static final java.util.Map<java.lang.String,AttributeValue> EMPTY_ATTRIBUTES

Constructor Detail
- Link
```
Link()
```

Method Detail
- fromSpanContext
```
public static Link fromSpanContext(SpanContext context,
                                   Link.Type type)
```
  Returns a new Link.
  
  Parameters:
  
  context - the context of the linked Span.
  
  type - the type of the relationship with the linked Span.
  
  Returns:
  
  a new Link.
  
  Since:
  
  0.5
- fromSpanContext
```
public static Link fromSpanContext(SpanContext context,
                                   Link.Type type,
                                   java.util.Map<java.lang.String,AttributeValue> attributes)
```
  Returns a new Link.
  
  Parameters:
  
  context - the context of the linked Span.
  
  type - the type of the relationship with the linked Span.
  
  attributes - the attributes of the Link.
  
  Returns:
  
  a new Link.
  
  Since:
  
  0.5
- getTraceId
```
public abstract TraceId getTraceId()
```
  Returns the TraceId.
  
  Returns:
  
  the TraceId.
  
  Since:
  
  0.5
- getSpanId
```
public abstract SpanId getSpanId()
```
  Returns the SpanId.
  
  Returns:
  
  the SpanId
  
  Since:
  
  0.5
- getType
```
public abstract Link.Type getType()
```
  Returns the Type.
  
  Returns:
  
  the Type.
  
  Since:
  
  0.5
- getAttributes
```
public abstract java.util.Map<java.lang.String,AttributeValue> getAttributes()
```
  Returns the set of attributes.
  
  Returns:
  
  the set of attributes.
  
  Since:
  
  0.5