OpenTelemetry笔记(2)-Span操作

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介绍 Span 的状态、属性、事件

Span 状态

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/**
 * The set of canonical status codes. If new codes are added over time they must choose a numerical
 * value that does not collide with any previously used value.
 */
public enum StatusCode {
  /** The default status. */
  UNSET,

  /**
   * The operation has been validated by an Application developers or Operator to have completed
   * successfully.
   */
  OK,

  /** The operation contains an error. */
  ERROR
}

public static void main(String[] args) {
        OpenTelemetry openTelemetry = OpenTelemetryFactory.create();
        Tracer tracer = openTelemetry.getTracer("demo-instrumentation","1.0.0");
            Span span = tracer.spanBuilder("basicSpan").startSpan();
            span.setStatus(StatusCode.OK|StatusCode.ERROR|StatusCode.UNSET);
            span.end();
}

Span 属性

使用 setAttribute 方法设置属性

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Span span = tracer.spanBuilder("valueSpan").startSpan();
span.setAttribute("value","test");
span.end();

Span 事件

有了事件，可以把 Span 当成一个完整的行为，行为内部的操作当中一个操作的事件步骤进行处理

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Span span = tracer.spanBuilder("EventSpan").startSpan();
span.addEvent("Init");
span.addEvent("End");
span.end();

在事件中携带属性

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Span span = tracer.spanBuilder("EventSpan").startSpan();
span.addEvent("Init", Attributes.of(AttributeKey.stringKey("request"),"request"));
span.addEvent("End",Attributes.of(AttributeKey.stringKey("response"),"response"));
span.end();