NoopSpan class

The No-op implementation of a Span in which all operations are no-ops.

Implemented types

• Span

Constructors

NoopSpan()

Properties

context ↔ SpanContext

Each span will have an associated SpanContext.

getter/setter pair, override-getter

duration → Duration?

Each span has a duration.

no setter, override

endTime → DateTime?

Each span has a UTC timestamp describing when it ended.

no setter, override

hashCode → int

The hash code for this object.

no setter, inherited

logData → List<LogData>?

Every Span has zero or more Logs, each of which being a timestamped event name, optionally accompanied by a structured data payload of arbitrary size. The event name should be the stable identifier for some notable moment in the lifetime of a Span. For instance, a Span representing a browser page load might add an event for each field in Performance.timing.

no setter, override

operationName → String?

Each Span has an operation name, a human-readable string which concisely represents the work done by the Span (e.g., an RPC method name, a function name, or the name of a subtask or stage within a larger computation). The operation name should be the most general (i.e., least specific) string that identifies a (statistically) interesting class of Span instances; more specific sub-classes should be described using Tags.

no setter, override

parentContext ↔ SpanContext?

Each span may or may not have an associated parentContext.

getter/setter pair, override-getter

references → List<Reference>?

A Span may reference zero or more Spans that are causally related. OpenTracing presently defines two types of references: ChildOf and FollowsFrom. Both reference types specifically model direct causal relationships between a child Span and a parent Span.

no setter, override

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

startTime ↔ DateTime?

Each span has a UTC timestamp describing when it started.

getter/setter pair, override

tags → Map<String, dynamic>?

Every Span may also have zero or more key:value Tags, which do not have timestamps and simply annotate the spans. As is the case with Logs, if certain known tag key:values are used for common application scenarios, tracers can choose to pay special attention to them.

no setter, override

whenFinished → Future<Span>

A hook for on finish event

no setter, override

Methods

addTags(Map<String, dynamic> keyValuePairs) → void

Adds a single tag to the Span. See addTags() for details. Adds the given key value pairs to the set of Span tags.

override

finish({DateTime? finishTime}) → void

Sets the end timestamp and finalizes Span state.

override

log(String event, {DateTime? timestamp, Object? payload}) → void

Explicitly creates a log record associated with the Span.

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

setTag(String key, dynamic value) → void

Tags this span with the current key-value pair.

override

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited