adds cpu usage information

build.gradle

@@ -21,6 +21,7 @@ allprojects {
 		maven { url 'https://repo.papermc.io/repository/maven-public/' }
 		maven { url = 'https://s01.oss.sonatype.org/content/repositories/snapshots/' } // needed for paper adventure snapshot
 		maven { url 'https://ci.emc.gs/nexus/content/groups/aikar/' }
+		maven { url 'https://oss.sonatype.org/content/repositories/snapshots' }
 	}
 }
 
@@ -37,6 +38,8 @@ dependencies {
 		exclude group: 'org.bstats', module: 'bstats-bukkit'
 	}
 
+	compileOnly 'me.lucko:spark-api:0.1-SNAPSHOT'
+
 	implementation fileTree(dir: 'lib', include: '*.jar')
 
 	testShadow group: 'junit', name: 'junit', version: '4.13.2'

src/main/java/ch/njol/skript/expressions/ExprCpuUsage.java

@@ -0,0 +1,105 @@
+package ch.njol.skript.expressions;
+
+import ch.njol.skript.Skript;
+import ch.njol.skript.lang.Expression;
+import ch.njol.skript.lang.ExpressionType;
+import ch.njol.skript.lang.SkriptParser;
+import ch.njol.skript.lang.util.SimpleExpression;
+import ch.njol.util.Kleenean;
+import ch.njol.util.coll.CollectionUtils;
+import me.lucko.spark.api.Spark;
+import me.lucko.spark.api.SparkProvider;
+import me.lucko.spark.api.statistic.StatisticWindow;
+import me.lucko.spark.api.statistic.types.DoubleStatistic;
+import org.bukkit.Bukkit;
+import org.bukkit.event.Event;
+import org.bukkit.plugin.Plugin;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ExprCpuUsage extends SimpleExpression<Number> {
+
+	private int index;
+	private String expr = "cpu";
+
+	static {
+		Skript.registerExpression(ExprCpuUsage.class, Number.class, ExpressionType.SIMPLE,
+			"cpu usage from [the] last 10[ ]s[seconds]",
+			"cpu usage from [the] last ([1] minute|1[ ]m[inute])",
+			"cpu usage from [the] last 15[ ]m[inutes]",
+			"[the] cpu usage");
+	}
+
+	private static Spark getSparkInstance() {
+		try {
+			Spark spark = SparkProvider.get();
+			if (spark != null) {
+				return SparkProvider.get();
+			}
+		} catch (Exception e) {
+			return null;
+		}
+		return null;
+	}
+
+	@Override
+	public boolean init(Expression<?>[] expressions, int matchedPattern, Kleenean isDelayed, SkriptParser.ParseResult parseResult) {
+		Spark spark = getSparkInstance();
+		if (spark != null) {
+			expr = parseResult.expr;
+			index = matchedPattern;
+			return true;
+		}
+		return false;
+	}
+
+	@Override
+	protected Number @Nullable [] get(Event event) {
+		Spark spark = SparkProvider.get();
+		DoubleStatistic<StatisticWindow.CpuUsage> cpuUsage = spark.cpuSystem();
+		return switch (index) {
+			case 0 -> {
+				double usageLast10Seconds = cpuUsage.poll(StatisticWindow.CpuUsage.SECONDS_10);
+				Number usage10Seconds = (Number) (usageLast10Seconds * 100);
+				yield new Number[]{usage10Seconds};
+			}
+			case 1 -> {
+				double usageLast1Minute = cpuUsage.poll(StatisticWindow.CpuUsage.MINUTES_1);
+				Number usage1Minute = (Number) (usageLast1Minute * 100);
+				yield new Number[]{usage1Minute};
+			}
+			case 2 -> {
+				double usageLast15Minutes = cpuUsage.poll(StatisticWindow.CpuUsage.MINUTES_15);
+				Number usage15Minutes = (Number) (usageLast15Minutes * 100);
+				yield new Number[]{usage15Minutes};
+			}
+			default -> {
+				double usageLast10Seconds = cpuUsage.poll(StatisticWindow.CpuUsage.SECONDS_10);
+				double usageLast1Minute = cpuUsage.poll(StatisticWindow.CpuUsage.MINUTES_1);
+				double usageLast15Minutes = cpuUsage.poll(StatisticWindow.CpuUsage.MINUTES_15);
+				Number number1 = (Number) (usageLast10Seconds * 100);
+				Number number2 = (Number) (usageLast1Minute * 100);
+				Number number3 = (Number) (usageLast15Minutes * 100);
+				yield new Number[]{number1, number2, number3};
+			}
+		};
+	}
+
+	@Override
+	public boolean isSingle() {
+		return index != 3;
+	}
+
+	@Override
+	public Class<? extends Number> getReturnType() {
+		return Number.class;
+	}
+
+	@Override
+	public String toString(@Nullable Event event, boolean debug) {
+		return expr;
+	}
+
+}