Struct tracing::Dispatch

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pub struct Dispatch { /* private fields */ }

Expand description

Dispatch trace data to a Subscriber.

Implementations

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impl Dispatch

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pub fn none() -> Dispatch

Returns a new Dispatch that discards events and spans.

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pub fn new<S>(subscriber: S) -> Dispatch where
S: 'static + Subscriber + Send + Sync,

Returns a Dispatch that forwards to the given Subscriber.

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pub fn register_callsite(
&self,
metadata: &'static Metadata<'static>
) -> Interest

Registers a new callsite with this subscriber, returning whether or not the subscriber is interested in being notified about the callsite.

This calls the register_callsite function on the Subscriber that this Dispatch forwards to.

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pub fn new_span(&self, span: &Attributes<'_>) -> Id

Record the construction of a new span, returning a new ID for the span being constructed.

This calls the new_span function on the Subscriber that this Dispatch forwards to.

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pub fn record(&self, span: &Id, values: &Record<'_>)

Record a set of values on a span.

This calls the record function on the Subscriber that this Dispatch forwards to.

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pub fn record_follows_from(&self, span: &Id, follows: &Id)

Adds an indication that span follows from the span with the id follows.

This calls the record_follows_from function on the Subscriber that this Dispatch forwards to.

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pub fn enabled(&self, metadata: &Metadata<'_>) -> bool

Returns true if a span with the specified metadata would be recorded.

This calls the enabled function on the Subscriber that this Dispatch forwards to.

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pub fn event(&self, event: &Event<'_>)

Records that an Event has occurred.

This calls the event function on the Subscriber that this Dispatch forwards to.

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pub fn enter(&self, span: &Id)

Records that a span has been can_enter.

This calls the enter function on the Subscriber that this Dispatch forwards to.

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pub fn exit(&self, span: &Id)

Records that a span has been exited.

This calls the exit function on the Subscriber that this Dispatch forwards to.

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pub fn clone_span(&self, id: &Id) -> Id

Notifies the subscriber that a span ID has been cloned.

This function must only be called with span IDs that were returned by this Dispatch’s new_span function. The tracing crate upholds this guarantee and any other libraries implementing instrumentation APIs must as well.

This calls the clone_span function on the Subscriber that this Dispatch forwards to.

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pub fn drop_span(&self, id: Id)

👎 Deprecated since 0.1.2:

use Dispatch::try_close instead

Notifies the subscriber that a span ID has been dropped.

This function must only be called with span IDs that were returned by this Dispatch’s new_span function. The tracing crate upholds this guarantee and any other libraries implementing instrumentation APIs must as well.

This calls the drop_span function on the Subscriber that this Dispatch forwards to.

    Deprecated: The 
    try_close method is functionally identical, but returns
    true if the span is now closed. It should be used
    instead of this method.

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pub fn try_close(&self, id: Id) -> bool

Notifies the subscriber that a span ID has been dropped, and returns true if there are now 0 IDs referring to that span.

This function must only be called with span IDs that were returned by this Dispatch’s new_span function. The tracing crate upholds this guarantee and any other libraries implementing instrumentation APIs must as well.

This calls the try_close function on the Subscriber that this Dispatch forwards to.

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