How to use

Db

in

co.elastic.apm.agent.impl.transaction

private void serializeDbContext(final Db db) {
  writeFieldName("db");
  jw.writeByte(OBJECT_START);
  writeField("instance", db.getInstance());
  if (db.getStatement() != null) {
    writeLongStringField("statement", db.getStatement());
  } else {
    final CharBuffer statementBuffer = db.getStatementBuffer();
    if (statementBuffer != null && statementBuffer.length() > 0) {
      writeFieldName("statement");
      jw.writeString(statementBuffer);
      jw.writeByte(COMMA);
    }
  }
  writeField("type", db.getType());
  writeLastField("user", db.getUser());
  jw.writeByte(OBJECT_END);
}

  public boolean hasContent() {
    return super.hasContent() || db.hasContent() || http.hasContent();
  }
}

@Override
public void resetState() {
  super.resetState();
  db.resetState();
  http.resetState();
}

  @Test
  void resetState() {
    Span span = new Span(mock(ElasticApmTracer.class))
      .withName("SELECT FROM product_types")
      .withType("db")
      .withSubtype("postgresql")
      .withAction("query");
    span.getContext().getDb()
      .withInstance("customers")
      .withStatement("SELECT * FROM product_types WHERE user_id=?")
      .withType("sql")
      .withUser("readonly_user");
    span.resetState();
    assertThat(span.getContext().hasContent()).isFalse();
    assertThat((CharSequence) span.getName()).isNullOrEmpty();
    assertThat(span.getType()).isNull();
    assertThat(span.getSubtype()).isNull();
    assertThat(span.getAction()).isNull();
  }
}

  .withAction("query");
span.getContext().getDb()
  .withInstance("customers")
  .withStatement("SELECT * FROM product_types WHERE user_id=?")
  .withType("sql")
  .withUser("readonly_user");
span.addTag("monitored_by", "ACME");
span.addTag("framework", "some-framework");

private void serializeSpanContext(SpanContext context) {
  writeFieldName("context");
  jw.writeByte(OBJECT_START);
  boolean spanContextWritten = false;
  Db db = context.getDb();
  if (db.hasContent()) {
    serializeDbContext(db);
    spanContextWritten = true;
  }
  Http http = context.getHttp();
  if (http.hasContent()) {
    if (spanContextWritten) {
      jw.writeByte(COMMA);
    }
    serializeHttpContext(http);
    spanContextWritten = true;
  }
  Map<String, String> tags = context.getTags();
  if (!tags.isEmpty()) {
    if (spanContextWritten) {
      jw.writeByte(COMMA);
    }
    writeFieldName("tags");
    serializeTags(tags);
  }
  jw.writeByte(OBJECT_END);
  jw.writeByte(COMMA);
}