Improve Duration.toMillis() (#1132)

* Improve java doc for toMillis().

* Make toMillis() non-static.

2 files changed, 2 insertions, 2 deletions

diff --git a/exporters/stats/signalfx/src/main/java/io/opencensus/exporter/stats/signalfx/SignalFxStatsExporterWorkerThread.java b/exporters/stats/signalfx/src/main/java/io/opencensus/exporter/stats/signalfx/SignalFxStatsExporterWorkerThread.java
index e8bfe426..3906b609 100644
--- a/exporters/stats/signalfx/src/main/java/io/opencensus/exporter/stats/signalfx/SignalFxStatsExporterWorkerThread.java
+++ b/exporters/stats/signalfx/src/main/java/io/opencensus/exporter/stats/signalfx/SignalFxStatsExporterWorkerThread.java
@@ -59,7 +59,7 @@ final class SignalFxStatsExporterWorkerThread extends Thread {
       String token,
       Duration interval,
       ViewManager views) {
-    this.intervalMs = Duration.toMillis(interval);
+    this.intervalMs = interval.toMillis();
     this.views = views;
     this.sender = factory.create(endpoint, token, ERROR_HANDLER);
 
diff --git a/exporters/stats/stackdriver/src/main/java/io/opencensus/exporter/stats/stackdriver/StackdriverExporterWorker.java b/exporters/stats/stackdriver/src/main/java/io/opencensus/exporter/stats/stackdriver/StackdriverExporterWorker.java
index 68ca85ff..1a2dce19 100644
--- a/exporters/stats/stackdriver/src/main/java/io/opencensus/exporter/stats/stackdriver/StackdriverExporterWorker.java
+++ b/exporters/stats/stackdriver/src/main/java/io/opencensus/exporter/stats/stackdriver/StackdriverExporterWorker.java
@@ -79,7 +79,7 @@ final class StackdriverExporterWorker implements Runnable {
       Duration exportInterval,
       ViewManager viewManager,
       MonitoredResource monitoredResource) {
-    this.scheduleDelayMillis = Duration.toMillis(exportInterval);
+    this.scheduleDelayMillis = exportInterval.toMillis();
     this.projectId = projectId;
     projectName = ProjectName.newBuilder().setProject(projectId).build();
     this.metricServiceClient = metricServiceClient;