io.micrometer.tracing.Span Maven / Gradle / Ivy
/**
* Copyright 2022 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.micrometer.tracing;
import io.micrometer.tracing.propagation.Propagator;
import java.util.concurrent.TimeUnit;
/**
* This API was heavily influenced by Brave. Parts of its documentation were taken
* directly from Brave.
*
* Span is a single unit of work that needs to be started and stopped. Contains timing
* information and events and tags.
*
* @author OpenZipkin Brave Authors
* @author Marcin Grzejszczak
* @since 1.0.0
*/
public interface Span extends io.micrometer.tracing.SpanCustomizer {
/**
* A noop implementation.
*/
Span NOOP = new Span() {
@Override
public boolean isNoop() {
return true;
}
@Override
public TraceContext context() {
return TraceContext.NOOP;
}
@Override
public Span start() {
return this;
}
@Override
public Span name(String name) {
return this;
}
@Override
public Span event(String value) {
return this;
}
@Override
public Span event(String value, long time, TimeUnit timeUnit) {
return this;
}
@Override
public Span tag(String key, String value) {
return this;
}
@Override
public Span error(Throwable throwable) {
return this;
}
@Override
public void end() {
}
@Override
public void end(long time, TimeUnit timeUnit) {
}
@Override
public void abandon() {
}
@Override
public Span remoteServiceName(String remoteServiceName) {
return this;
}
@Override
public Span remoteIpAndPort(String ip, int port) {
return this;
}
};
/**
* @return {@code true} when no recording is done and nothing is reported to an
* external system. However, this span should still be injected into outgoing
* requests. Use this flag to avoid performing expensive computation.
*/
boolean isNoop();
/**
* @return {@link TraceContext} corresponding to this span.
*/
TraceContext context();
/**
* Starts this span.
* @return this span
*/
Span start();
/**
* Sets a name on this span.
* @param name name to set on the span
* @return this span
*/
Span name(String name);
/**
* Sets an event on this span.
* @param value event name to set on the span
* @return this span
*/
Span event(String value);
/**
* Sets an event on this span.
* @param value event name to set on the span
* @param time timestamp of the event
* @param timeUnit timestamp's time unit
* @return this span
*/
Span event(String value, long time, TimeUnit timeUnit);
/**
* Sets a tag on this span.
* @param key tag key
* @param value tag value
* @return this span
*/
Span tag(String key, String value);
/**
* Sets a tag on this span.
* @param key tag key
* @param value tag value
* @return this span
*/
default Span tag(String key, long value) {
return tag(key, String.valueOf(value));
}
/**
* Sets a tag on this span.
* @param key tag key
* @param value tag value
* @return this span
*/
default Span tag(String key, double value) {
return tag(key, String.valueOf(value));
}
/**
* Sets a tag on this span.
* @param key tag key
* @param value tag value
* @return this span
*/
default Span tag(String key, boolean value) {
return tag(key, String.valueOf(value));
}
/**
* Records an exception for this span.
* @param throwable to record
* @return this span
*/
Span error(Throwable throwable);
/**
* Ends the span. The span gets stopped and recorded if not noop.
*/
void end();
/**
* Ends the span. The span gets stopped and recorded if not noop.
* @param time timestamp
* @param timeUnit time unit of the timestamp
*/
void end(long time, TimeUnit timeUnit);
/**
* Ends the span. The span gets stopped but does not get recorded.
*/
void abandon();
/**
* Sets the remote service name for the span.
* @param remoteServiceName remote service name
* @return this span
*/
Span remoteServiceName(String remoteServiceName);
/**
* Sets the remote url on the span.
* @param ip remote ip
* @param port remote port
* @return this span
* @since 1.0.0
*/
Span remoteIpAndPort(String ip, int port);
/**
* Type of span. Can be used to specify additional relationships between spans in
* addition to a parent/child relationship.
*
* Documentation of the enum taken from OpenTelemetry.
*/
enum Kind {
/**
* Indicates that the span covers server-side handling of an RPC or other remote
* request.
*/
SERVER,
/**
* Indicates that the span covers the client-side wrapper around an RPC or other
* remote request.
*/
CLIENT,
/**
* Indicates that the span describes producer sending a message to a broker.
* Unlike client and server, there is no direct critical path latency relationship
* between producer and consumer spans.
*/
PRODUCER,
/**
* Indicates that the span describes consumer receiving a message from a broker.
* Unlike client and server, there is no direct critical path latency relationship
* between producer and consumer spans.
*/
CONSUMER
}
/**
* In some cases (e.g. when dealing with
* {@link Propagator#extract(Object, Propagator.Getter)}'s we want to create a span
* that has not yet been started, yet it's heavily configurable (some options are not
* possible to be set when a span has already been started). We can achieve that by
* using a builder.
*
* Inspired by OpenZipkin Brave and OpenTelemetry API.
*/
interface Builder {
/**
* A noop implementation.
*/
Builder NOOP = new Builder() {
@Override
public Builder setParent(TraceContext context) {
return this;
}
@Override
public Builder setNoParent() {
return this;
}
@Override
public Builder name(String name) {
return this;
}
@Override
public Builder event(String value) {
return this;
}
@Override
public Builder tag(String key, String value) {
return this;
}
@Override
public Builder error(Throwable throwable) {
return this;
}
@Override
public Builder kind(Kind spanKind) {
return this;
}
@Override
public Builder remoteServiceName(String remoteServiceName) {
return this;
}
@Override
public Builder remoteIpAndPort(String ip, int port) {
return this;
}
@Override
public Builder startTimestamp(long startTimestamp, TimeUnit unit) {
return this;
}
@Override
public Span start() {
return Span.NOOP;
}
};
/**
* Sets the parent of the built span.
* @param context parent's context
* @return this
*/
Builder setParent(TraceContext context);
/**
* Sets no parent of the built span.
* @return this
*/
Builder setNoParent();
/**
* Sets the name of the span.
* @param name span name
* @return this
*/
Builder name(String name);
/**
* Sets an event on the span.
* @param value event value
* @return this
*/
Builder event(String value);
/**
* Sets a tag on the span.
* @param key tag key
* @param value tag value
* @return this
*/
Builder tag(String key, String value);
/**
* Sets a tag on the span.
* @param key tag key
* @param value tag value
* @return this
*/
default Builder tag(String key, long value) {
return tag(key, String.valueOf(value));
}
/**
* Sets a tag on the span.
* @param key tag key
* @param value tag value
* @return this
*/
default Builder tag(String key, double value) {
return tag(key, String.valueOf(value));
}
/**
* Sets a tag on the span.
* @param key tag key
* @param value tag value
* @return this
*/
default Builder tag(String key, boolean value) {
return tag(key, String.valueOf(value));
}
/**
* Sets an error on the span.
* @param throwable error to set
* @return this
*/
Builder error(Throwable throwable);
/**
* Sets the kind on the span.
* @param spanKind kind of the span
* @return this
*/
Builder kind(Span.Kind spanKind);
/**
* Sets the remote service name for the span.
* @param remoteServiceName remote service name
* @return this
*/
Builder remoteServiceName(String remoteServiceName);
/**
* Sets the remote URL for the span.
* @param ip remote service ip
* @param port remote service port
* @return this
*/
Builder remoteIpAndPort(String ip, int port);
/**
* Sets start timestamp.
* @param startTimestamp start timestamp
* @param unit start time unit
* @return this
*/
Builder startTimestamp(long startTimestamp, TimeUnit unit);
/**
* Adds a link to the newly created {@code Span}.
*
*
* Links are used to link {@link Span}s in different traces. Used (for example) in
* batching operations, where a single batch handler processes multiple requests
* from different traces or the same trace.
* @param link link to add
* @return this
* @since 1.1.0
*/
default Builder addLink(Link link) {
return this;
}
/**
* Builds and starts the span.
* @return started span
*/
Span start();
}
}