More work done on config code

Essentials/src/com/earth2me/essentials/user/User.java

@@ -0,0 +1,111 @@
+package com.earth2me.essentials.user;
+
+import com.earth2me.essentials.IEssentials;
+import com.earth2me.essentials.storage.AbstractDelayedYamlFileWriter;
+import com.earth2me.essentials.storage.StorageObject;
+import com.earth2me.essentials.storage.YamlStorageReader;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+import lombok.Cleanup;
+import org.bukkit.OfflinePlayer;
+import org.bukkit.entity.Player;
+
+// this is a prototype for locking userdata
+public class User extends UserBase implements IOfflineUser
+{
+	private transient UserData data = new UserData();
+	private final transient ReentrantReadWriteLock rwl = new ReentrantReadWriteLock();
+
+	public User(final Player base, final IEssentials ess)
+	{
+		super(base, ess);
+	}
+
+	public User(final OfflinePlayer offlinePlayer, final IEssentials ess)
+	{
+		super(offlinePlayer, ess);
+	}
+
+	public void loadUserData()
+	{
+		data = new YamlStorageReader(null).load(UserData.class);
+	}
+
+	@Override
+	public UserData getData()
+	{
+		return data;
+	}
+
+	@Override
+	public void aquireReadLock()
+	{
+		rwl.readLock().lock();
+	}
+
+	@Override
+	public void aquireWriteLock()
+	{
+		while (rwl.getReadHoldCount() > 0)
+		{
+			rwl.readLock().unlock();
+		}
+		rwl.writeLock().lock();
+		rwl.readLock().lock();
+	}
+
+	@Override
+	public void close()
+	{
+		if (rwl.isWriteLockedByCurrentThread())
+		{
+			rwl.writeLock().unlock();
+			scheduleSaving();
+		}
+		while (rwl.getReadHoldCount() > 0)
+		{
+			rwl.readLock().unlock();
+		}
+	}
+
+	public void example()
+	{
+		// Cleanup will call close at the end of the function
+		@Cleanup
+		final User user = this;
+
+		// read lock allows to read data from the user
+		user.aquireReadLock();
+		final double money = user.getData().getMoney();
+
+		// write lock allows only one thread to modify the data
+		user.aquireWriteLock();
+		user.getData().setMoney(10 + money);
+	}
+
+	private void scheduleSaving()
+	{
+		new UserDataWriter();
+	}
+
+
+	private class UserDataWriter extends AbstractDelayedYamlFileWriter
+	{
+		public UserDataWriter()
+		{
+			super(ess, ess.getUserMap().getUserFile(User.this.getName()));
+		}
+
+		@Override
+		public StorageObject getObject()
+		{
+			aquireReadLock();
+			return getData();
+		}
+
+		@Override
+		public void onFinish()
+		{
+			close();
+		}
+	}
+}