lrhkobe opened a new pull request, #952:
URL: https://github.com/apache/incubator-eventmesh/pull/952
Fixes ISSUE #946 .
### Motivation
- The current trace implementation is relatively simple ，may not general
enough for other specific trace plugin implementations.
### Modifications
- Adjust eventmesh-trace-api，which is based on opentelemetry-api
```
public interface EventMeshTraceService {
void init() throws TraceException;
//extract attr from carrier to context
Context extractFrom(Context context, Map<String, Object> carrier) throws
TraceException;
//inject attr from context to carrier
void inject(Context context, Map<String, Object> carrier);
Span createSpan(String spanName, SpanKind spanKind, long startTimestamp,
TimeUnit timeUnit,
Context context, boolean isSpanFinishInOtherThread)
throws TraceException;
Span createSpan(String spanName, SpanKind spanKind, Context context,
boolean isSpanFinishInOtherThread) throws TraceException;
void shutdown() throws TraceException;
}
```
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