How to use

JsonCodec

in

zipkin.internal

protected void sendSpans(List<zipkin.Span> spanList) {
  try {
    sendSpans(Codec.JSON.writeSpans(spanList));
  } catch (IOException e) {
    Set<String> affectedTraceIds = new HashSet<>(spanList.size());
    for (zipkin.Span span : spanList) {
      affectedTraceIds.add(String.valueOf(span.traceId));
    }
    logger.error("An error occurred attempting to post Zipkin spans to the Zipkin server. affected_trace_ids={}, exception_cause=\"{}\"",
           affectedTraceIds.toString(), e.toString());
  }
}

 @Override public byte[] encode(Span span) {
  return Codec.JSON.writeSpan(span);
 }
};

 @Override public List<DependencyLink> apply(SearchResponse response) {
  if (response.getHits() == null) return ImmutableList.of();
  ImmutableList.Builder<DependencyLink> unmerged = ImmutableList.builder();
  for (SearchHit hit : response.getHits()) {
   DependencyLink link = Codec.JSON.readDependencyLink(hit.getSourceRef().toBytes());
   unmerged.add(link);
  }
  return unmerged.build();
 }
}

    sentSpans.add(zipkinSpan(random.nextLong(), UUID.randomUUID().toString()));
  long expectedUncompressedPayloadSize = Codec.JSON.writeSpans(sentSpans).length;
  byte[] deserializableBytes = (compressPayload) ? unGzip(receivedPayloadBytes) : receivedPayloadBytes;
  List<zipkin.Span> receivedSpans = Codec.JSON.readSpans(deserializableBytes);
  assertThat(receivedSpans).isEqualTo(sentSpans);
} finally {

 @Override public Iterable<Span> call(byte[] bytes) throws Exception {
  logInitializer().run();
  if (bytes.length == 0) return Collections.emptyList();
  try {
   if (bytes[0] == '[') {
    return Codec.JSON.readSpans(bytes);
   } else {
    if (bytes[0] == 12 /* TType.STRUCT */) {
     return Codec.THRIFT.readSpans(bytes);
    } else { // historical kafka encoding of single thrift span per message
     return Collections.singletonList(Codec.THRIFT.readSpan(bytes));
    }
   }
  } catch (RuntimeException e) {
   log.warn("unable to decode spans", e);
   return Collections.emptyList();
  }
 }
}

 @Override
 public List<Span> apply(SearchResponse response) {
  if (response.getHits().totalHits() == 0) {
   return null;
  }
  ImmutableList.Builder<Span> trace = ImmutableList.builder();
  for (SearchHit hit : response.getHits()) {
   trace.add(Codec.JSON.readSpan(hit.getSourceRef().toBytes()));
  }
  return trace.build();
 }
});

 /**
  * Conditionally decodes depending on whether the input bytes are encoded as a single span or a
  * list.
  */
 static List<Span> fromBytes(byte[] bytes) {
  // In TBinaryProtocol encoding, the first byte is the TType, in a range 0-16
  // .. If the first byte isn't in that range, it isn't a thrift.
  //
  // When byte(0) == '[' (91), assume it is a list of json-encoded spans
  //
  // When byte(0) <= 16, assume it is a TBinaryProtocol-encoded thrift
  // .. When serializing a Span (Struct), the first byte will be the type of a field
  // .. When serializing a List[ThriftSpan], the first byte is the member type, TType.STRUCT(12)
  // .. As ThriftSpan has no STRUCT fields: so, if the first byte is TType.STRUCT(12), it is a list.
  if (bytes[0] == '[') {
   return Codec.JSON.readSpans(bytes);
  } else if (bytes[0] == 12 /* TType.STRUCT */) {
   return Codec.THRIFT.readSpans(bytes);
  } else {
   return Collections.singletonList(Codec.THRIFT.readSpan(bytes));
  }
 }
}

 /**
  * Conditionally decodes depending on whether the input bytes are encoded as a single span or a
  * list.
  */
 static List<Span> fromBytes(byte[] bytes) {
  // In TBinaryProtocol encoding, the first byte is the TType, in a range 0-16
  // .. If the first byte isn't in that range, it isn't a thrift.
  //
  // When byte(0) == '[' (91), assume it is a list of json-encoded spans
  //
  // When byte(0) <= 16, assume it is a TBinaryProtocol-encoded thrift
  // .. When serializing a Span (Struct), the first byte will be the type of a field
  // .. When serializing a List[ThriftSpan], the first byte is the member type, TType.STRUCT(12)
  // .. As ThriftSpan has no STRUCT fields: so, if the first byte is TType.STRUCT(12), it is a list.
  if (bytes[0] == '[') {
   return Codec.JSON.readSpans(bytes);
  } else if (bytes[0] == 12 /* TType.STRUCT */) {
   return Codec.THRIFT.readSpans(bytes);
  } else {
   return Collections.singletonList(Codec.THRIFT.readSpan(bytes));
  }
 }
}

protected void sendSpans(List<zipkin.Span> spanList) {
  try {
    sendSpans(Codec.JSON.writeSpans(spanList));
  } catch (IOException e) {
    Set<String> affectedTraceIds = new HashSet<>(spanList.size());
    for (zipkin.Span span : spanList) {
      affectedTraceIds.add(String.valueOf(span.traceId));
    }
    logger.error("An error occurred attempting to post Zipkin spans to the Zipkin server. affected_trace_ids={}, exception_cause=\"{}\"",
           affectedTraceIds.toString(), e.toString());
  }
}

public static byte[] toSpanBytes(Span span, Long timestampMillis) {
 return timestampMillis != null
   ? prefixWithTimestampMillis(Codec.JSON.writeSpan(span), timestampMillis)
   : Codec.JSON.writeSpan(span);
}

@Test
public void sendSpans_with_span_list_delegates_to_sendSpans_with_byte_array() throws IOException {
  // given
  List<zipkin.Span> zipkinSpans = new ArrayList<>();
  for (int i = 0; i < 10; i++) {
    zipkinSpans.add(zipkinSpan(random.nextLong(), UUID.randomUUID().toString()));
  }
  byte[] expectedBytesPayload = Codec.JSON.writeSpans(zipkinSpans);
  // when
  implSpy.sendSpans(zipkinSpans);
  // then
  verify(implSpy).sendSpans(expectedBytesPayload);
}