Pass a preconfigured HttpSender to the trace exporter (#1444)

* Pass a preconfigured HttpSender to the trace exporter

* Add createWithSender to changelog

2 files changed, 26 insertions, 0 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index c3d346b7..9a461bb1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 - Add `AttributeValueDouble` to `AttributeValue`.
 - Allow users to report metrics for their registered domain (using custom prefix). This could be a
   breaking change if you have custom prefix without (registered) domain.
+- Add `createWithSender` to `JaegerTraceExporter` to allow use of `HttpSender`
+  with extra configurations
 
 ## 0.16.0 - 2018-09-14
 - Add APIs to register gRPC client and server views separately.
diff --git a/exporters/trace/jaeger/src/main/java/io/opencensus/exporter/trace/jaeger/JaegerTraceExporter.java b/exporters/trace/jaeger/src/main/java/io/opencensus/exporter/trace/jaeger/JaegerTraceExporter.java
index 7a9b13a5..4890f01a 100644
--- a/exporters/trace/jaeger/src/main/java/io/opencensus/exporter/trace/jaeger/JaegerTraceExporter.java
+++ b/exporters/trace/jaeger/src/main/java/io/opencensus/exporter/trace/jaeger/JaegerTraceExporter.java
@@ -68,6 +68,24 @@ public final class JaegerTraceExporter {
     }
   }
 
+  /**
+   * Creates and registers the Jaeger Trace exporter to the OpenCensus library using the provided
+   * HttpSender. Only one Jaeger exporter can be registered at any point.
+   *
+   * @param httpSender the pre-configured HttpSender to use with the exporter
+   * @param serviceName the local service name of the process.
+   * @throws IllegalStateException if a Jaeger exporter is already registered.
+   * @since 0.17
+   */
+  public static void createWithSender(final HttpSender httpSender, final String serviceName) {
+    synchronized (monitor) {
+      checkState(handler == null, "Jaeger exporter is already registered.");
+      final SpanExporter.Handler newHandler = newHandlerWithSender(httpSender, serviceName);
+      JaegerTraceExporter.handler = newHandler;
+      register(Tracing.getExportComponent().getSpanExporter(), newHandler);
+    }
+  }
+
   private static SpanExporter.Handler newHandler(
       final String thriftEndpoint, final String serviceName) {
     final HttpSender sender = new HttpSender(thriftEndpoint);
@@ -75,6 +93,12 @@ public final class JaegerTraceExporter {
     return new JaegerExporterHandler(sender, process);
   }
 
+  private static SpanExporter.Handler newHandlerWithSender(
+      final HttpSender sender, final String serviceName) {
+    final Process process = new Process(serviceName);
+    return new JaegerExporterHandler(sender, process);
+  }
+
   /**
    * Registers the {@link JaegerTraceExporter}.
    *