Detect when a player opens or closes his own inventory

DetectInventoryOpenClose.java

package fr.onecraft.inventory;

import com.comphenix.tinyprotocol.TinyProtocol;
import io.netty.channel.Channel;
import org.bukkit.Bukkit;
import org.bukkit.entity.Player;
import org.bukkit.plugin.Plugin;

import java.lang.reflect.Field;

/**
 * Detect when a player opens or closes his own inventory
 */
public class DetectInventoryOpenClose {

    public void onPlayerOpenInventory(Player p) {
        Bukkit.broadcastMessage("§aOPEN INVENTORY: " + p.getName());
    }

    public void onPlayerCloseInventory(Player p) {
        Bukkit.broadcastMessage("§cCLOSED INVENTORY: " + p.getName());
    }

    public DetectInventoryOpenClose(Plugin plugin) {
        new TinyProtocol(plugin) {

            @Override
            public Object onPacketInAsync(Player sender, Channel channel, Object packet) {

                String packetName = packet.getClass().getSimpleName();

                if ("PacketPlayInClientCommand".equals(packetName)) {

                    for (Field field : packet.getClass().getDeclaredFields()) {
                        if ("EnumClientCommand".equals(field.getType().getSimpleName())) {
                            try {

                                field.setAccessible(true);
                                if ("OPEN_INVENTORY_ACHIEVEMENT".equals(field.get(packet).toString())) {
                                    onPlayerOpenInventory(sender);
                                    break;
                                }

                            } catch (IllegalAccessException e) {
                                e.printStackTrace();
                            }
                        }
                    }

                } else if ("PacketPlayInCloseWindow".equals(packetName)) {

                    for (Field field : packet.getClass().getDeclaredFields()) {
                        if (field.getType() == int.class) {
                            try {

                                field.setAccessible(true);
                                if ((int) field.get(packet) == 0) {
                                    onPlayerCloseInventory(sender);
                                    break;
                                }

                            } catch (IllegalAccessException e) {
                                e.printStackTrace();
                            }
                        }
                    }
                }

                return super.onPacketInAsync(sender, channel, packet);
            }
        };
    }

}

pom.xml

<properties>
    <!-- Spigot Version -->
    <spigotVersion>1.10.2-R0.1-SNAPSHOT</spigotVersion>
</properties>

<repositories>
    <!-- Spigot repository -->
    <repository>
        <id>spigot-repo</id>
        <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
    </repository>
    <!-- TinyProtocol repository -->
    <repository>
        <id>dmulloy2-repo</id>
        <url>http://repo.dmulloy2.net/content/groups/public/</url>
    </repository>
</repositories>

<dependencies>
    <!-- Spigot API -->
    <dependency>
        <groupId>org.spigotmc</groupId>
        <artifactId>spigot-api</artifactId>
        <version>${spigotVersion}</version>
        <scope>provided</scope>
    </dependency>
    <!-- Spigot server -->
    <dependency>
        <groupId>org.spigotmc</groupId>
        <artifactId>spigot</artifactId>
        <version>${spigotVersion}</version>
        <scope>provided</scope>
    </dependency>
    <!-- TinyProtocol -->
    <dependency>
        <groupId>com.comphenix.tinyprotocol</groupId>
        <artifactId>TinyProtocol</artifactId>
        <version>1.0.0-SNAPSHOT</version>
        <scope>compile</scope>
    </dependency>
</dependencies>