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Carry the intercepted HTTP status as an int, rendering it on demand #12395
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67 changes: 67 additions & 0 deletions
67
dd-trace-core/src/test/java/datadog/trace/core/MetadataTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| package datadog.trace.core; | ||
|
|
||
| import static datadog.trace.api.cache.RadixTreeCache.UNSET_STATUS; | ||
| import static java.util.Collections.emptyList; | ||
| import static java.util.Collections.emptyMap; | ||
| import static org.junit.jupiter.api.Assertions.assertEquals; | ||
| import static org.junit.jupiter.api.Assertions.assertNull; | ||
| import static org.junit.jupiter.api.Assertions.assertSame; | ||
|
|
||
| import datadog.trace.api.TagMap; | ||
| import datadog.trace.bootstrap.instrumentation.api.UTF8BytesString; | ||
| import org.junit.jupiter.api.Test; | ||
| import org.junit.jupiter.params.ParameterizedTest; | ||
| import org.junit.jupiter.params.provider.ValueSource; | ||
|
|
||
| /** | ||
| * The HTTP status is carried as an int and rendered only on demand, so that a serializer encoding | ||
| * it numerically never pays for a string it will not send. | ||
| */ | ||
| class MetadataTest { | ||
|
|
||
| @ParameterizedTest | ||
| @ValueSource(ints = {200, 201, 404, 500, 599}) | ||
| void rendersTheStatusOnlyWhenAsked(int status) { | ||
| Metadata metadata = metadataWithStatus(status); | ||
|
|
||
| assertEquals(status, metadata.getHttpStatusCode()); | ||
| assertEquals(Integer.toString(status), metadata.getHttpStatusCodeString().toString()); | ||
| } | ||
|
|
||
| @Test | ||
| void reportsNoStatusAsUnsetRatherThanZeroString() { | ||
| Metadata metadata = metadataWithStatus(UNSET_STATUS); | ||
|
|
||
| assertEquals(UNSET_STATUS, metadata.getHttpStatusCode()); | ||
| assertNull( | ||
| metadata.getHttpStatusCodeString(), | ||
| "an absent status must not render as \"0\": the string protocols write the key only when" | ||
| + " the span carries a status"); | ||
| } | ||
|
|
||
| @Test | ||
| void reusesTheRenderedStatusAcrossSpans() { | ||
| // The point of routing through RadixTreeCache rather than rendering per span: two spans with | ||
| // the same status share one UTF8BytesString instead of allocating one apiece. | ||
| UTF8BytesString first = metadataWithStatus(404).getHttpStatusCodeString(); | ||
| UTF8BytesString second = metadataWithStatus(404).getHttpStatusCodeString(); | ||
|
|
||
| assertSame(first, second); | ||
| } | ||
|
|
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| private static Metadata metadataWithStatus(int status) { | ||
| return new Metadata( | ||
| Thread.currentThread().getId(), | ||
| UTF8BytesString.create("main"), | ||
| TagMap.fromMap(emptyMap()), | ||
| emptyMap(), | ||
| 0, | ||
| false, | ||
| false, | ||
| status, | ||
| null, | ||
| 0, | ||
| null, | ||
| emptyList()); | ||
| } | ||
| } |
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This should be a small performance improvement for the application threads, since we're avoiding an expensive cache lookup.
However given that this is more of a functional change and the necessary benchmark doesn't yet exist, I'm going to leave the benchmarking to another PR.