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From ok2c <...@git.apache.org>
Subject [GitHub] httpclient pull request #74: WIP: OpenTracing integration
Date Fri, 12 May 2017 13:29:04 GMT
Github user ok2c commented on a diff in the pull request:

    https://github.com/apache/httpclient/pull/74#discussion_r116229419
  
    --- Diff: httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/TracingAsyncExec.java
---
    @@ -0,0 +1,80 @@
    +package org.apache.hc.client5.http.impl.async;
    +
    +import java.io.IOException;
    +import java.net.URISyntaxException;
    +
    +import org.apache.hc.client5.http.async.AsyncExecCallback;
    +import org.apache.hc.client5.http.async.AsyncExecChain;
    +import org.apache.hc.client5.http.async.AsyncExecChain.Scope;
    +import org.apache.hc.client5.http.async.AsyncExecChainHandler;
    +import org.apache.hc.core5.http.EntityDetails;
    +import org.apache.hc.core5.http.HttpException;
    +import org.apache.hc.core5.http.HttpRequest;
    +import org.apache.hc.core5.http.HttpResponse;
    +import org.apache.hc.core5.http.nio.AsyncDataConsumer;
    +import org.apache.hc.core5.http.nio.AsyncEntityProducer;
    +
    +import io.opentracing.Span;
    +import io.opentracing.Tracer;
    +import io.opentracing.Tracer.SpanBuilder;
    +import io.opentracing.contrib.spanmanager.DefaultSpanManager;
    +import io.opentracing.contrib.spanmanager.SpanManager.ManagedSpan;
    +import io.opentracing.tag.Tags;
    +
    +/**
    + * @author Pavol Loffay
    + */
    +public class TracingAsyncExec implements AsyncExecChainHandler {
    +
    +  private Tracer tracer;
    +
    +  public TracingAsyncExec(Tracer tracer) {
    +    this.tracer = tracer;
    +  }
    +
    +  @Override
    +  public void execute(HttpRequest request, AsyncEntityProducer entityProducer, final
Scope scope,
    +      AsyncExecChain chain, final AsyncExecCallback asyncExecCallback) throws HttpException,
IOException {
    +
    +    SpanBuilder spanBuilder = tracer.buildSpan(request.getMethod())
    +        .withTag(Tags.SPAN_KIND.getKey(), Tags.SPAN_KIND_CLIENT);
    +
    +    ManagedSpan current = DefaultSpanManager.getInstance().current();
    --- End diff --
    
    1. I may be missing something obvious but what is so difficult about shoving things into
HttpContext?  
    2. Async client has a different threading model compared to the classic one thread per
socket one, like it or not.


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