feat: no need to use a ProcessWrapper to init the metadata

Author: metacosm

backend/src/main/java/net/laprun/sustainability/power/sensors/macos/powermetrics/NuProcessWrapper.java

@@ -6,19 +6,20 @@
 import com.zaxxer.nuprocess.NuProcess;
 import com.zaxxer.nuprocess.NuProcessBuilder;
 
+import net.laprun.sustainability.power.nuprocess.BaseProcessHandler;
+
 public class NuProcessWrapper implements ProcessWrapper {
     private PowermetricsProcessHandler measureHandler;
     private String periodInMilliSecondsAsString;
 
     @SuppressWarnings("UnusedReturnValue")
-    private NuProcess exec(PowermetricsProcessHandler handler) {
+    public static NuProcess exec(BaseProcessHandler handler) {
         if (handler == null)
             throw new IllegalArgumentException("Handler cannot be null");
         return new NuProcessBuilder(handler, handler.command()).start();
     }
 
-    @Override
-    public InputStream streamForMetadata() {
+    public static InputStream metadataInputStream() {
         final var metadataHandler = new PowermetricsProcessHandler(6500, "cpu_power", "-i", "10", "-n", "1");
         exec(metadataHandler);
         try {

backend/src/main/java/net/laprun/sustainability/power/sensors/macos/powermetrics/ProcessMacOSPowermetricsSensor.java

@@ -10,7 +10,7 @@ public class ProcessMacOSPowermetricsSensor extends MacOSPowermetricsSensor {
     public ProcessMacOSPowermetricsSensor() {
         // extract metadata
         try {
-            initMetadata(processWrapper.streamForMetadata());
+            initMetadata(NuProcessWrapper.metadataInputStream());
         } catch (Exception e) {
             throw new RuntimeException("Couldn't extract sensor metadata", e);
         }

backend/src/main/java/net/laprun/sustainability/power/sensors/macos/powermetrics/ProcessWrapper.java

@@ -3,7 +3,6 @@
 import java.io.InputStream;
 
 public interface ProcessWrapper {
-    InputStream streamForMetadata();
 
     void start(long periodInMilliSeconds);
 
@@ -24,4 +23,8 @@ static String[] preparePowermetricsCommand(String[] command) {
         System.arraycopy(command, 0, args, additionalArgsCardinality, command.length);
         return args;
     }
+
+    static String[] preparePowermetricsCommandVarArgs(String... command) {
+        return preparePowermetricsCommand(command);
+    }
 }