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Allows extraction of just a trace ID (not span ID) from an incoming c…
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Adrian Cole
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Oct 6, 2017
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| package brave.propagation; | ||
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| import com.google.auto.value.AutoValue; | ||
| import javax.annotation.Nullable; | ||
| import javax.annotation.concurrent.Immutable; | ||
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| import static brave.internal.HexCodec.writeHexLong; | ||
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| /** | ||
| * Contains inbound trace ID and sampling flags, used when users control the root trace ID, but not | ||
| * the span ID (ex Amazon X-Ray or other correlation). | ||
| */ | ||
| @Immutable | ||
| @AutoValue | ||
| public abstract class TraceIdContext extends SamplingFlags { | ||
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| public static Builder newBuilder() { | ||
| return new AutoValue_TraceIdContext.Builder().traceIdHigh(0L).debug(false); | ||
| } | ||
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| /** When non-zero, the trace containing this span uses 128-bit trace identifiers. */ | ||
| public abstract long traceIdHigh(); | ||
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| /** Unique 8-byte identifier for a trace, set on all spans within it. */ | ||
| public abstract long traceId(); | ||
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| // override as auto-value can't currently read the super-class's nullable annotation. | ||
| @Override @Nullable public abstract Boolean sampled(); | ||
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| public abstract Builder toBuilder(); | ||
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| /** Returns {@code $traceId} */ | ||
| @Override | ||
| public String toString() { | ||
| boolean traceHi = traceIdHigh() != 0; | ||
| char[] result = new char[traceHi ? 32 : 16]; | ||
| int pos = 0; | ||
| if (traceHi) { | ||
| writeHexLong(result, pos, traceIdHigh()); | ||
| pos += 16; | ||
| } | ||
| writeHexLong(result, pos, traceId()); | ||
| return new String(result); | ||
| } | ||
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| @AutoValue.Builder | ||
| public static abstract class Builder { | ||
| /** @see TraceIdContext#traceIdHigh() */ | ||
| public abstract Builder traceIdHigh(long traceIdHigh); | ||
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| /** @see TraceIdContext#traceId() */ | ||
| public abstract Builder traceId(long traceId); | ||
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| /** @see TraceIdContext#sampled */ | ||
| public abstract Builder sampled(@Nullable Boolean nullableSampled); | ||
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| /** @see TraceIdContext#debug() */ | ||
| public abstract Builder debug(boolean debug); | ||
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| public abstract TraceIdContext build(); | ||
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| Builder() { // no external implementations | ||
| } | ||
| } | ||
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| TraceIdContext() { // no external implementations | ||
| } | ||
| } |
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29 changes: 29 additions & 0 deletions
29
brave/src/test/java/brave/propagation/TraceIdContextTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,29 @@ | ||
| package brave.propagation; | ||
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| import org.junit.Test; | ||
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| import static org.assertj.core.api.Assertions.assertThat; | ||
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| public class TraceIdContextTest { | ||
| TraceIdContext context = TraceIdContext.newBuilder().traceId(333L).build(); | ||
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| @Test public void compareUnequalIds() { | ||
| assertThat(context) | ||
| .isNotEqualTo(context.toBuilder().traceIdHigh(222L).build()); | ||
| } | ||
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| @Test public void compareEqualIds() { | ||
| assertThat(context) | ||
| .isEqualTo(TraceIdContext.newBuilder().traceId(333L).build()); | ||
| } | ||
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| @Test public void testToString_lo() { | ||
| assertThat(context.toString()) | ||
| .isEqualTo("000000000000014d"); | ||
| } | ||
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| @Test public void testToString() { | ||
| assertThat(context.toBuilder().traceIdHigh(222L).build().toString()) | ||
| .isEqualTo("00000000000000de000000000000014d"); | ||
| } | ||
| } |
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