[MRESOLVER-635] Use Instant instead of untyped millis for TransferRes…

…ource startTime (#615)

maven-resolver-api/src/main/java/org/eclipse/aether/transfer/TransferResource.java

@@ -20,6 +20,8 @@
 
 import java.io.File;
 import java.nio.file.Path;
+import java.time.Clock;
+import java.time.Instant;
 
 import org.eclipse.aether.RequestTrace;
 
@@ -28,6 +30,8 @@
  */
 public final class TransferResource {
 
+    private static Clock clock = Clock.systemUTC();
+
     private final String repositoryId;
 
     private final String repositoryUrl;
@@ -38,14 +42,22 @@ public final class TransferResource {
 
     private final Path path;
 
-    private final long startTime;
+    private final Instant startTime;
 
     private final RequestTrace trace;
 
     private long contentLength = -1L;
 
     private long resumeOffset;
 
+    public static Clock getClock() {
+        return clock;
+    }
+
+    public static void setClock(Clock clock) {
+        TransferResource.clock = clock;
+    }
+
     /**
      * Creates a new transfer resource with the specified properties.
      *
@@ -114,7 +126,7 @@ public TransferResource(
         this.path = path;
         this.resource = resource;
         this.trace = trace;
-        this.startTime = System.currentTimeMillis();
+        this.startTime = getClock().instant();
     }
 
     /**
@@ -232,8 +244,19 @@ public TransferResource setResumeOffset(long resumeOffset) {
      * Gets the timestamp when the transfer of this resource was started.
      *
      * @return The timestamp when the transfer of this resource was started.
+     * @deprecated use {@link #getStartTime()}
      */
+    @Deprecated
     public long getTransferStartTime() {
+        return startTime.toEpochMilli();
+    }
+
+    /**
+     * Gets the timestamp when the transfer of this resource was started.
+     *
+     * @return The timestamp when the transfer of this resource was started.
+     */
+    public Instant getStartTime() {
         return startTime;
     }
 

maven-resolver-demos/maven-resolver-demo-snippets/src/main/java/org/apache/maven/resolver/examples/util/ConsoleTransferListener.java

@@ -21,6 +21,8 @@
 import java.io.PrintStream;
 import java.text.DecimalFormat;
 import java.text.DecimalFormatSymbols;
+import java.time.Duration;
+import java.time.Instant;
 import java.util.Locale;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
@@ -116,11 +118,11 @@ public void transferSucceeded(TransferEvent event) {
             String len = contentLength >= 1024 ? toKB(contentLength) + " KB" : contentLength + " B";
 
             String throughput = "";
-            long duration = System.currentTimeMillis() - resource.getTransferStartTime();
-            if (duration > 0) {
+            Duration duration = Duration.between(resource.getStartTime(), Instant.now());
+            if (duration.toMillis() > 0) {
                 long bytes = contentLength - resource.getResumeOffset();
                 DecimalFormat format = new DecimalFormat("0.0", new DecimalFormatSymbols(Locale.ENGLISH));
-                double kbPerSec = (bytes / 1024.0) / (duration / 1000.0);
+                double kbPerSec = (bytes / 1024.0) / duration.toSeconds();
                 throughput = " at " + format.format(kbPerSec) + " KB/sec";
             }