add TracerBuilderExtensions to configure LightStep exporter

src/OpenTelemetry.Exporter.LightStep/TracerBuilderExtensions.cs

@@ -0,0 +1,86 @@
+// <copyright file="TracerBuilderExtensions.cs" company="OpenTelemetry Authors">
+// Copyright 2018, OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// </copyright>
+
+using System;
+using OpenTelemetry.Exporter.LightStep;
+using OpenTelemetry.Trace.Export;
+
+namespace OpenTelemetry.Trace.Configuration
+{
+    /// <summary>
+    /// Extension methods to simplify registering of Zipkin exporter.
+    /// </summary>
+    public static class TracerBuilderExtensions
+    {
+        /// <summary>
+        /// Registers LightStep exporter.
+        /// </summary>
+        /// <param name="builder">Trace builder to use.</param>
+        /// <param name="configure">Configuration options.</param>
+        /// <returns>The instance of <see cref="TracerBuilder"/> to chain the calls.</returns>
+        public static TracerBuilder UseLightStep(this TracerBuilder builder, Action<LightStepTraceExporterOptions> configure)
+        {
+            if (builder == null)
+            {
+                throw new ArgumentNullException(nameof(builder));
+            }
+
+            if (configure == null)
+            {
+                throw new ArgumentNullException(nameof(configure));
+            }
+
+            var options = new LightStepTraceExporterOptions();
+            configure(options);
+            return builder.AddProcessorPipeline(b => b
+                .SetExporter(new LightStepTraceExporter(options))
+                .SetExportingProcessor(e => new BatchingSpanProcessor(e)));
+        }
+
+        /// <summary>
+        /// Registers LightStep exporter.
+        /// </summary>
+        /// <param name="builder">Trace builder to use.</param>
+        /// <param name="configure">Configuration options.</param>
+        /// <param name="processorConfigure">Span processor configuration.</param>
+        /// <returns>The instance of <see cref="TracerBuilder"/> to chain the calls.</returns>
+        public static TracerBuilder UseLightStep(this TracerBuilder builder, Action<LightStepTraceExporterOptions> configure, Action<SpanProcessorPipelineBuilder> processorConfigure)
+        {
+            if (builder == null)
+            {
+                throw new ArgumentNullException(nameof(builder));
+            }
+
+            if (configure == null)
+            {
+                throw new ArgumentNullException(nameof(configure));
+            }
+
+            if (processorConfigure == null)
+            {
+                throw new ArgumentNullException(nameof(processorConfigure));
+            }
+
+            var options = new LightStepTraceExporterOptions();
+            configure(options);
+            return builder.AddProcessorPipeline(b =>
+            {
+                b.SetExporter(new LightStepTraceExporter(options));
+                processorConfigure.Invoke(b);
+            });
+        }
+    }
+}