Show time to bootstrap stage on Forge

common/src/main/java/org/embeddedt/modernfix/util/TimeFormatter.java

@@ -0,0 +1,67 @@
+package org.embeddedt.modernfix.util;
+
+import java.util.Locale;
+import java.util.concurrent.TimeUnit;
+
+import static java.util.concurrent.TimeUnit.*;
+import static java.util.concurrent.TimeUnit.NANOSECONDS;
+
+/**
+ * All code here is derived from Guava's Stopwatch and Platform classes.
+ * Too bad it's not a public method call indeed...
+ */
+public class TimeFormatter {
+    static String formatCompact4Digits(double value) {
+        return String.format(Locale.ROOT, "%.4g", value);
+    }
+
+    public static String formatNanos(long nanos) {
+        TimeUnit unit = chooseUnit(nanos);
+        double value = (double) nanos / NANOSECONDS.convert(1, unit);
+
+        return formatCompact4Digits(value) + " " + abbreviate(unit);
+    }
+
+    private static TimeUnit chooseUnit(long nanos) {
+        if (DAYS.convert(nanos, NANOSECONDS) > 0) {
+            return DAYS;
+        }
+        if (HOURS.convert(nanos, NANOSECONDS) > 0) {
+            return HOURS;
+        }
+        if (MINUTES.convert(nanos, NANOSECONDS) > 0) {
+            return MINUTES;
+        }
+        if (SECONDS.convert(nanos, NANOSECONDS) > 0) {
+            return SECONDS;
+        }
+        if (MILLISECONDS.convert(nanos, NANOSECONDS) > 0) {
+            return MILLISECONDS;
+        }
+        if (MICROSECONDS.convert(nanos, NANOSECONDS) > 0) {
+            return MICROSECONDS;
+        }
+        return NANOSECONDS;
+    }
+
+    private static String abbreviate(TimeUnit unit) {
+        switch (unit) {
+            case NANOSECONDS:
+                return "ns";
+            case MICROSECONDS:
+                return "\u03bcs"; // μs
+            case MILLISECONDS:
+                return "ms";
+            case SECONDS:
+                return "s";
+            case MINUTES:
+                return "min";
+            case HOURS:
+                return "h";
+            case DAYS:
+                return "d";
+            default:
+                throw new AssertionError();
+        }
+    }
+}

forge/src/main/java/org/embeddedt/modernfix/forge/mixin/core/BootstrapMixin.java

@@ -3,6 +3,7 @@ package org.embeddedt.modernfix.forge.mixin.core;
 import net.minecraft.server.Bootstrap;
 import org.apache.logging.log4j.Logger;
 import org.embeddedt.modernfix.forge.load.ModWorkManagerQueue;
+import org.embeddedt.modernfix.util.TimeFormatter;
 import org.spongepowered.asm.mixin.Final;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Shadow;
@@ -10,6 +11,8 @@ import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
+import java.lang.management.ManagementFactory;
+
 @Mixin(Bootstrap.class)
 public class BootstrapMixin {
     @Shadow private static boolean isBootstrapped;
@@ -19,7 +22,7 @@ public class BootstrapMixin {
     @Inject(method = "bootStrap", at = @At("HEAD"))
     private static void doModernFixBootstrap(CallbackInfo ci) {
         if(!isBootstrapped) {
-            LOGGER.info("ModernFix bootstrap");
+            LOGGER.info("ModernFix reached bootstrap stage ({} after launch)", TimeFormatter.formatNanos(ManagementFactory.getRuntimeMXBean().getUptime() * 1000L));
             ModWorkManagerQueue.replace();
         }
     }