SpringCloud/spring-cloud-sleuth
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Added docs with an example of CompletableFuture usage

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This commit is contained in:
Marcin Grzejszczak
2016-04-19 10:01:17 +02:00
parent 7dc30191cc
commit 2806747c6e
2 changed files with 28 additions and 0 deletions
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20
spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/async/TraceableExecutorServiceTests.java
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@@ -15,6 +15,7 @@ import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.runners.MockitoJUnitRunner;
import org.springframework.cloud.sleuth.DefaultSpanNamer;
import org.springframework.cloud.sleuth.NoOpSpanReporter;
import org.springframework.cloud.sleuth.Span;
import org.springframework.cloud.sleuth.SpanNamer;
@@ -66,6 +67,25 @@ public class TraceableExecutorServiceTests {
then(this.spanVerifyingRunnable.spanIds.stream().distinct().collect(toList())).hasSize(TOTAL_THREADS);
}
@Test
public void should_propagate_trace_info_when_compleable_future_is_used() throws Exception {
Tracer tracer = this.tracer;
TraceKeys traceKeys = new TraceKeys();
SpanNamer spanNamer = new DefaultSpanNamer();
// tag::completablefuture[]
CompletableFuture<Long> completableFuture = CompletableFuture.supplyAsync(() -> {
// perform some logic
return 1_000_000L;
}, new TraceableExecutorService(Executors.newCachedThreadPool(),
// 'calculateTax' explicitly names the span - this param is optional
tracer, traceKeys, spanNamer, "calculateTax"));
// end::completablefuture[]
then(completableFuture.get()).isEqualTo(1_000_000L);
then(this.tracer.getCurrentSpan()).isNull();
}
private CompletableFuture<?>[] runnablesExecutedViaTraceManagerableExecutorService() {
List<CompletableFuture<?>> futures = new ArrayList<>();
for (int i = 0; i < TOTAL_THREADS; i++) {