Exporter: Start adding OC-Agent Trace Exporter. (#1455)
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4e4d3af..b3fa302 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,13 +1,14 @@
## Unreleased
- Add `AttributeValueDouble` to `AttributeValue`.
- Add `createWithSender` to `JaegerTraceExporter` to allow use of `HttpSender`
- with extra configurations
+ with extra configurations.
- Add an API `Functions.returnToString()`.
- Add `opencensus-contrib-opencensus-proto-util` that has helper utilities to convert between
Java data models and protos.
- Migrate to new Stackdriver Kubernetes monitored resource. This could be a breaking change
if you are using `gke_container` resources. For more info,
https://cloud.google.com/monitoring/kubernetes-engine/migration#incompatible
+- Add OpenCensus Java OC-Agent Trace Exporter.
## 0.16.1 - 2018-09-18
- Fix ClassCastException in Log4j log correlation
diff --git a/RELEASING.md b/RELEASING.md
index 669fc8f..2b4aa51 100644
--- a/RELEASING.md
+++ b/RELEASING.md
@@ -220,6 +220,7 @@
exporters/trace/instana/README.md
exporters/trace/logging/README.md
exporters/trace/jaeger/README.md
+ exporters/trace/ocagent/README.md
exporters/trace/stackdriver/README.md
exporters/trace/zipkin/README.md
)
diff --git a/all/build.gradle b/all/build.gradle
index 072459d..66e6a89 100644
--- a/all/build.gradle
+++ b/all/build.gradle
@@ -20,6 +20,7 @@
project(':opencensus-contrib-spring-sleuth-v1x'),
project(':opencensus-contrib-zpages'),
project(':opencensus-exporter-trace-logging'),
+ project(':opencensus-exporter-trace-ocagent'),
project(':opencensus-exporter-trace-stackdriver'),
project(':opencensus-exporter-trace-zipkin'),
project(':opencensus-exporter-trace-jaeger'),
@@ -46,6 +47,7 @@
project(':opencensus-contrib-spring-sleuth-v1x'),
project(':opencensus-contrib-zpages'),
project(':opencensus-exporter-trace-logging'),
+ project(':opencensus-exporter-trace-ocagent'),
project(':opencensus-exporter-trace-stackdriver'),
project(':opencensus-exporter-trace-zipkin'),
project(':opencensus-exporter-trace-jaeger'),
diff --git a/build.gradle b/build.gradle
index 7754eba..e3bcb68 100644
--- a/build.gradle
+++ b/build.gradle
@@ -432,6 +432,7 @@
'opencensus-exporter-stats-stackdriver',
'opencensus-exporter-trace-instana',
'opencensus-exporter-trace-logging',
+ 'opencensus-exporter-trace-ocagent',
'opencensus-exporter-trace-stackdriver',
'opencensus-exporter-trace-zipkin',
'opencensus-exporter-trace-jaeger',
diff --git a/buildscripts/import-control.xml b/buildscripts/import-control.xml
index 69a3de8..2467e35 100644
--- a/buildscripts/import-control.xml
+++ b/buildscripts/import-control.xml
@@ -174,6 +174,10 @@
<allow pkg="io.opencensus.exporter.trace.jaeger"/>
<allow pkg="org.apache.thrift"/>
</subpackage>
+ <subpackage name="ocagent">
+ <allow pkg="io.opencensus.exporter.trace.ocagent"/>
+ <allow pkg="io.opencensus.proto"/>
+ </subpackage>
<subpackage name="stackdriver">
<allow pkg="com.google"/>
<allow pkg="io.opencensus.exporter.trace.stackdriver"/>
diff --git a/exporters/trace/ocagent/README.md b/exporters/trace/ocagent/README.md
new file mode 100644
index 0000000..4f25bd6
--- /dev/null
+++ b/exporters/trace/ocagent/README.md
@@ -0,0 +1,48 @@
+# OpenCensus Java OC-Agent Trace Exporter
+
+The *OpenCensus Java OC-Agent Trace Exporter* is the Java implementation of the OpenCensus Agent
+(OC-Agent) Trace Exporter.
+
+## Quickstart
+
+### Add the dependencies to your project
+
+For Maven add to your `pom.xml`:
+```xml
+<dependencies>
+ <dependency>
+ <groupId>io.opencensus</groupId>
+ <artifactId>opencensus-api</artifactId>
+ <version>0.17.0</version>
+ </dependency>
+ <dependency>
+ <groupId>io.opencensus</groupId>
+ <artifactId>opencensus-exporter-trace-ocagent</artifactId>
+ <version>0.17.0</version>
+ </dependency>
+ <dependency>
+ <groupId>io.opencensus</groupId>
+ <artifactId>opencensus-impl</artifactId>
+ <version>0.17.0</version>
+ <scope>runtime</scope>
+ </dependency>
+</dependencies>
+```
+
+For Gradle add to your dependencies:
+```gradle
+compile 'io.opencensus:opencensus-api:0.17.0'
+compile 'io.opencensus:opencensus-exporter-trace-ocagent:0.17.0'
+runtime 'io.opencensus:opencensus-impl:0.17.0'
+```
+
+### Register the exporter
+
+```java
+public class MyMainClass {
+ public static void main(String[] args) throws Exception {
+ OcAgentTraceExporter.createAndRegister();
+ // ...
+ }
+}
+```
diff --git a/exporters/trace/ocagent/build.gradle b/exporters/trace/ocagent/build.gradle
new file mode 100644
index 0000000..7214eb5
--- /dev/null
+++ b/exporters/trace/ocagent/build.gradle
@@ -0,0 +1,19 @@
+description = 'OpenCensus Java OC-Agent Trace Exporter'
+
+[compileJava, compileTestJava].each() {
+ it.sourceCompatibility = 1.7
+ it.targetCompatibility = 1.7
+}
+
+dependencies {
+ compileOnly libraries.auto_value
+
+ compile project(':opencensus-api'),
+ project(':opencensus-contrib-monitored-resource-util'),
+ libraries.opencensus_proto
+
+ testCompile project(':opencensus-api')
+
+ signature "org.codehaus.mojo.signature:java17:1.0@signature"
+ signature "net.sf.androidscents.signature:android-api-level-14:4.0_r4@signature"
+}
diff --git a/exporters/trace/ocagent/src/main/java/io/opencensus/exporter/trace/ocagent/OcAgentTraceExporter.java b/exporters/trace/ocagent/src/main/java/io/opencensus/exporter/trace/ocagent/OcAgentTraceExporter.java
new file mode 100644
index 0000000..c704314
--- /dev/null
+++ b/exporters/trace/ocagent/src/main/java/io/opencensus/exporter/trace/ocagent/OcAgentTraceExporter.java
@@ -0,0 +1,124 @@
+/*
+ * Copyright 2018, OpenCensus 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.
+ */
+
+package io.opencensus.exporter.trace.ocagent;
+
+import static com.google.common.base.Preconditions.checkState;
+
+import com.google.common.annotations.VisibleForTesting;
+import io.opencensus.trace.Tracing;
+import io.opencensus.trace.export.SpanExporter;
+import io.opencensus.trace.export.SpanExporter.Handler;
+import javax.annotation.Nullable;
+import javax.annotation.concurrent.GuardedBy;
+import javax.annotation.concurrent.ThreadSafe;
+
+/**
+ * The implementation of the OpenCensus Agent (OC-Agent) Trace Exporter.
+ *
+ * <p>Example of usage:
+ *
+ * <pre>{@code
+ * public static void main(String[] args) {
+ * OcAgentTraceExporter.createAndRegister();
+ * ... // Do work.
+ * }
+ * }</pre>
+ *
+ * @since 0.17
+ */
+@ThreadSafe
+public final class OcAgentTraceExporter {
+
+ private static final Object monitor = new Object();
+ private static final String REGISTER_NAME = OcAgentTraceExporter.class.getName();
+
+ @GuardedBy("monitor")
+ @Nullable
+ private static Handler handler = null;
+
+ private OcAgentTraceExporter() {}
+
+ /**
+ * Creates a {@code OcAgentTraceExporterHandler} with default configurations and registers it to
+ * the OpenCensus library.
+ *
+ * @since 0.17
+ */
+ public static void createAndRegister() {
+ synchronized (monitor) {
+ checkState(handler == null, "OC-Agent exporter is already registered.");
+ OcAgentTraceExporterHandler newHandler = new OcAgentTraceExporterHandler();
+ registerInternal(newHandler);
+ }
+ }
+
+ /**
+ * Creates a {@code OcAgentTraceExporterHandler} with the given configurations and registers it to
+ * the OpenCensus library.
+ *
+ * @param configuration the {@code OcAgentTraceExporterConfiguration}.
+ * @since 0.17
+ */
+ public static void createAndRegister(OcAgentTraceExporterConfiguration configuration) {
+ synchronized (monitor) {
+ checkState(handler == null, "OC-Agent exporter is already registered.");
+ OcAgentTraceExporterHandler newHandler =
+ new OcAgentTraceExporterHandler(
+ configuration.getEndPoint(),
+ configuration.getServiceName(),
+ configuration.getUseInsecure());
+ registerInternal(newHandler);
+ }
+ }
+
+ /**
+ * Registers the {@code OcAgentTraceExporterHandler}.
+ *
+ * @param spanExporter the instance of the {@code SpanExporter} where this service is registered.
+ */
+ @VisibleForTesting
+ static void register(SpanExporter spanExporter, Handler handler) {
+ spanExporter.registerHandler(REGISTER_NAME, handler);
+ }
+
+ private static void registerInternal(Handler newHandler) {
+ synchronized (monitor) {
+ handler = newHandler;
+ register(Tracing.getExportComponent().getSpanExporter(), newHandler);
+ }
+ }
+
+ /**
+ * Unregisters the OC-Agent exporter from the OpenCensus library.
+ *
+ * @since 0.17
+ */
+ public static void unregister() {
+ unregister(Tracing.getExportComponent().getSpanExporter());
+ }
+
+ /**
+ * Unregisters the {@code OcAgentTraceExporterHandler}.
+ *
+ * @param spanExporter the instance of the {@code SpanExporter} from where this service is
+ * unregistered.
+ */
+ @VisibleForTesting
+ static void unregister(SpanExporter spanExporter) {
+ spanExporter.unregisterHandler(REGISTER_NAME);
+ }
+}
diff --git a/exporters/trace/ocagent/src/main/java/io/opencensus/exporter/trace/ocagent/OcAgentTraceExporterConfiguration.java b/exporters/trace/ocagent/src/main/java/io/opencensus/exporter/trace/ocagent/OcAgentTraceExporterConfiguration.java
new file mode 100644
index 0000000..0800eff
--- /dev/null
+++ b/exporters/trace/ocagent/src/main/java/io/opencensus/exporter/trace/ocagent/OcAgentTraceExporterConfiguration.java
@@ -0,0 +1,117 @@
+/*
+ * Copyright 2018, OpenCensus 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.
+ */
+
+package io.opencensus.exporter.trace.ocagent;
+
+import com.google.auto.value.AutoValue;
+import javax.annotation.Nullable;
+import javax.annotation.concurrent.Immutable;
+
+/**
+ * Configurations for {@link OcAgentTraceExporter}.
+ *
+ * @since 0.17
+ */
+@AutoValue
+@Immutable
+public abstract class OcAgentTraceExporterConfiguration {
+
+ OcAgentTraceExporterConfiguration() {}
+
+ /**
+ * Returns the end point of OC-Agent. The end point can be dns, ip:port, etc.
+ *
+ * @return the end point of OC-Agent.
+ * @since 0.17
+ */
+ @Nullable
+ public abstract String getEndPoint();
+
+ /**
+ * Returns whether to disable client transport security for the exporter's gRPC connection or not.
+ *
+ * @return whether to disable client transport security for the exporter's gRPC connection or not.
+ * @since 0.17
+ */
+ @Nullable
+ public abstract Boolean getUseInsecure();
+
+ /**
+ * Returns the service name to be used for this {@link OcAgentTraceExporter}.
+ *
+ * @return the service name.
+ * @since 0.17
+ */
+ @Nullable
+ public abstract String getServiceName();
+
+ /**
+ * Returns a new {@link Builder}.
+ *
+ * @return a {@code Builder}.
+ * @since 0.17
+ */
+ public static Builder builder() {
+ return new AutoValue_OcAgentTraceExporterConfiguration.Builder();
+ }
+
+ /**
+ * Builder for {@link OcAgentTraceExporterConfiguration}.
+ *
+ * @since 0.17
+ */
+ @AutoValue.Builder
+ public abstract static class Builder {
+
+ Builder() {}
+
+ /**
+ * Sets the end point of OC-Agent server.
+ *
+ * @param endPoint the end point of OC-Agent.
+ * @return this.
+ * @since 0.17
+ */
+ public abstract Builder setEndPoint(String endPoint);
+
+ /**
+ * Sets whether to disable client transport security for the exporter's gRPC connection or not.
+ *
+ * @param useInsecure whether disable client transport security for the exporter's gRPC
+ * connection.
+ * @return this.
+ * @since 0.17
+ */
+ public abstract Builder setUseInsecure(Boolean useInsecure);
+
+ /**
+ * Sets the service name to be used for this {@link OcAgentTraceExporter}.
+ *
+ * @param serviceName the service name.
+ * @return this.
+ * @since 0.17
+ */
+ public abstract Builder setServiceName(String serviceName);
+
+ /**
+ * Builds a {@link OcAgentTraceExporterConfiguration}.
+ *
+ * @return a {@code OcAgentTraceExporterConfiguration}.
+ * @since 0.17
+ */
+ public abstract OcAgentTraceExporterConfiguration build();
+ }
+}
diff --git a/exporters/trace/ocagent/src/main/java/io/opencensus/exporter/trace/ocagent/OcAgentTraceExporterHandler.java b/exporters/trace/ocagent/src/main/java/io/opencensus/exporter/trace/ocagent/OcAgentTraceExporterHandler.java
new file mode 100644
index 0000000..27e56c6
--- /dev/null
+++ b/exporters/trace/ocagent/src/main/java/io/opencensus/exporter/trace/ocagent/OcAgentTraceExporterHandler.java
@@ -0,0 +1,51 @@
+/*
+ * Copyright 2018, OpenCensus 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.
+ */
+
+package io.opencensus.exporter.trace.ocagent;
+
+import io.opencensus.trace.export.SpanData;
+import io.opencensus.trace.export.SpanExporter.Handler;
+import java.util.Collection;
+import javax.annotation.Nullable;
+
+/** Exporting handler for OC-Agent Tracing. */
+final class OcAgentTraceExporterHandler extends Handler {
+
+ private static final String DEFAULT_END_POINT = "localhost:55678";
+ private static final String DEFAULT_SERVICE_NAME = "OpenCensus";
+
+ // private final String endPoint;
+ // private final String serviceName;
+ // private final boolean useInsecure;
+
+ OcAgentTraceExporterHandler() {
+ this(null, null, null);
+ }
+
+ OcAgentTraceExporterHandler(
+ @Nullable String endPoint, @Nullable String serviceName, @Nullable Boolean useInsecure) {
+ // this.endPoint = endPoint == null ? DEFAULT_END_POINT : endPoint;
+ // this.serviceName = serviceName == null ? DEFAULT_SERVICE_NAME : serviceName;
+ // this.useInsecure = useInsecure == null ? false : useInsecure;
+ }
+
+ @Override
+ public void export(Collection<SpanData> spanDataList) {
+ // TODO(songya): implement this.
+ // for (SpanData spanData : spanDataList) {
+ // }
+ }
+}
diff --git a/exporters/trace/ocagent/src/main/java/io/opencensus/exporter/trace/ocagent/package-info.java b/exporters/trace/ocagent/src/main/java/io/opencensus/exporter/trace/ocagent/package-info.java
new file mode 100644
index 0000000..d01dd7e
--- /dev/null
+++ b/exporters/trace/ocagent/src/main/java/io/opencensus/exporter/trace/ocagent/package-info.java
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2018, OpenCensus 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.
+ */
+
+/**
+ * This package contains the Java implementation of the OpenCensus Agent (OC-Agent) Trace Exporter.
+ *
+ * <p>WARNING: Currently all the public classes under this package are marked as {@link
+ * io.opencensus.common.ExperimentalApi}. The classes and APIs under {@link
+ * io.opencensus.exporter.trace.ocagent} are likely to get backwards-incompatible updates in the
+ * future. DO NOT USE except for experimental purposes.
+ *
+ * <p>See more details on
+ * https://github.com/census-instrumentation/opencensus-proto/tree/master/src/opencensus/proto/agent.
+ */
+@io.opencensus.common.ExperimentalApi
+package io.opencensus.exporter.trace.ocagent;
diff --git a/exporters/trace/ocagent/src/test/java/io/opencensus/exporter/trace/ocagent/OcAgentTraceExporterConfigurationTest.java b/exporters/trace/ocagent/src/test/java/io/opencensus/exporter/trace/ocagent/OcAgentTraceExporterConfigurationTest.java
new file mode 100644
index 0000000..4349dfd
--- /dev/null
+++ b/exporters/trace/ocagent/src/test/java/io/opencensus/exporter/trace/ocagent/OcAgentTraceExporterConfigurationTest.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2018, OpenCensus 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.
+ */
+
+package io.opencensus.exporter.trace.ocagent;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Unit tests for {@link OcAgentTraceExporterConfiguration}. */
+@RunWith(JUnit4.class)
+public class OcAgentTraceExporterConfigurationTest {
+
+ @Test
+ public void defaultConfiguration() {
+ OcAgentTraceExporterConfiguration configuration =
+ OcAgentTraceExporterConfiguration.builder().build();
+ assertThat(configuration.getEndPoint()).isNull();
+ assertThat(configuration.getServiceName()).isNull();
+ assertThat(configuration.getUseInsecure()).isNull();
+ }
+
+ @Test
+ public void setAndGet() {
+ OcAgentTraceExporterConfiguration configuration =
+ OcAgentTraceExporterConfiguration.builder()
+ .setEndPoint("192.168.0.1:50051")
+ .setServiceName("service")
+ .setUseInsecure(true)
+ .build();
+ assertThat(configuration.getEndPoint()).isEqualTo("192.168.0.1:50051");
+ assertThat(configuration.getServiceName()).isEqualTo("service");
+ assertThat(configuration.getUseInsecure()).isTrue();
+ }
+}
diff --git a/exporters/trace/ocagent/src/test/java/io/opencensus/exporter/trace/ocagent/OcAgentTraceExporterTest.java b/exporters/trace/ocagent/src/test/java/io/opencensus/exporter/trace/ocagent/OcAgentTraceExporterTest.java
new file mode 100644
index 0000000..c58acdb
--- /dev/null
+++ b/exporters/trace/ocagent/src/test/java/io/opencensus/exporter/trace/ocagent/OcAgentTraceExporterTest.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2018, OpenCensus 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.
+ */
+
+package io.opencensus.exporter.trace.ocagent;
+
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.eq;
+import static org.mockito.Mockito.verify;
+
+import io.opencensus.trace.export.SpanExporter;
+import io.opencensus.trace.export.SpanExporter.Handler;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+/** Unit tests for {@link OcAgentTraceExporter}. */
+@RunWith(JUnit4.class)
+public class OcAgentTraceExporterTest {
+ @Mock private SpanExporter spanExporter;
+ @Mock private Handler handler;
+
+ @Before
+ public void setUp() {
+ MockitoAnnotations.initMocks(this);
+ }
+
+ @Test
+ public void registerUnregisterOcAgentTraceExporter() {
+ OcAgentTraceExporter.register(spanExporter, handler);
+ verify(spanExporter)
+ .registerHandler(
+ eq("io.opencensus.exporter.trace.ocagent.OcAgentTraceExporter"),
+ any(OcAgentTraceExporterHandler.class));
+ OcAgentTraceExporter.unregister(spanExporter);
+ verify(spanExporter)
+ .unregisterHandler(eq("io.opencensus.exporter.trace.ocagent.OcAgentTraceExporter"));
+ }
+}
diff --git a/settings.gradle b/settings.gradle
index dda7557..409d314 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -7,6 +7,7 @@
include ":opencensus-testing"
include ":opencensus-exporter-trace-instana"
include ":opencensus-exporter-trace-logging"
+include ":opencensus-exporter-trace-ocagent"
include ":opencensus-exporter-trace-stackdriver"
include ":opencensus-exporter-trace-zipkin"
include ":opencensus-exporter-trace-jaeger"
@@ -59,6 +60,8 @@
"$rootDir/exporters/trace/instana" as File
project(':opencensus-exporter-trace-logging').projectDir =
"$rootDir/exporters/trace/logging" as File
+project(':opencensus-exporter-trace-ocagent').projectDir =
+ "$rootDir/exporters/trace/ocagent" as File
project(':opencensus-exporter-trace-stackdriver').projectDir =
"$rootDir/exporters/trace/stackdriver" as File
project(':opencensus-exporter-trace-zipkin').projectDir = "$rootDir/exporters/trace/zipkin" as File