feat(hamster-core-bukkit): 添加 runtime 指令

hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/core/ParentCoreCommand.java

@@ -16,6 +16,7 @@ public class ParentCoreCommand extends ParentCommand {
         addChildCommand(YamlCommand.INSTANCE);
         addChildCommand(InfoModeCommand.INSTANCE);
         addChildCommand(ReloadCommand.INSTANCE);
+        addChildCommand(RuntimeCommand.INSTANCE);
     }
 
     @Override

hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/core/sub/RuntimeCommand.java

@@ -0,0 +1,50 @@
+package cn.hamster3.mc.plugin.core.bukkit.command.core.sub;
+
+import cn.hamster3.mc.plugin.core.bukkit.command.ChildCommand;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Collections;
+import java.util.List;
+
+public class RuntimeCommand extends ChildCommand {
+    public static final RuntimeCommand INSTANCE = new RuntimeCommand();
+
+    private RuntimeCommand() {
+    }
+
+    @Override
+    public @NotNull String getName() {
+        return "runtime";
+    }
+
+    @Override
+    public @NotNull String getUsage() {
+        return "runtime";
+    }
+
+    @Override
+    public boolean hasPermission(@NotNull CommandSender sender) {
+        return true;
+    }
+
+    @Override
+    public @NotNull String getDescription() {
+        return "查看JVM信息";
+    }
+
+    @Override
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        Runtime runtime = Runtime.getRuntime();
+        sender.sendMessage("空闲内存：" + runtime.freeMemory() / 1024.0);
+        sender.sendMessage("已用内存：" + runtime.totalMemory() / 1024.0);
+        sender.sendMessage("最大可用内存：" + runtime.maxMemory() / 1024.0);
+        return true;
+    }
+
+    @Override
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
+        return Collections.emptyList();
+    }
+}