Refactoring to create less redundant code

Essentials/src/com/earth2me/essentials/storage/AsyncStorageObjectHolder.java

@@ -0,0 +1,141 @@
+package com.earth2me.essentials.storage;
+
+import com.earth2me.essentials.IConf;
+import com.earth2me.essentials.IEssentials;
+import java.io.File;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+import java.util.logging.Level;
+import org.bukkit.Bukkit;
+
+
+public abstract class AsyncStorageObjectHolder<T extends StorageObject> implements IConf, IStorageObjectHolder<T>
+{
+	private transient T data;
+	private final transient ReentrantReadWriteLock rwl = new ReentrantReadWriteLock();
+	private final transient Class<T> clazz;
+	protected final transient IEssentials ess;
+
+	public AsyncStorageObjectHolder(final IEssentials ess, final Class<T> clazz)
+	{
+		this.ess = ess;
+		this.clazz = clazz;
+		try
+		{
+			this.data = clazz.newInstance();
+		}
+		catch (Exception ex)
+		{
+			Bukkit.getLogger().log(Level.SEVERE, ex.getMessage(), ex);
+		}
+	}
+
+	public T getData()
+	{
+		return data;
+	}
+
+	public void acquireReadLock()
+	{
+		rwl.readLock().lock();
+	}
+
+	public void acquireWriteLock()
+	{
+		while (rwl.getReadHoldCount() > 0)
+		{
+			rwl.readLock().unlock();
+		}
+		rwl.writeLock().lock();
+		rwl.readLock().lock();
+	}
+
+	public void close()
+	{
+		unlock();
+	}
+	
+	public void unlock()
+	{
+		if (rwl.isWriteLockedByCurrentThread())
+		{
+			rwl.writeLock().unlock();
+			new StorageObjectDataWriter();
+		}
+		while (rwl.getReadHoldCount() > 0)
+		{
+			rwl.readLock().unlock();
+		}
+	}
+
+	@Override
+	public void reloadConfig()
+	{
+		new StorageObjectDataReader();
+	}
+
+	public abstract File getStorageFile();
+
+
+	private class StorageObjectDataWriter extends AbstractDelayedYamlFileWriter
+	{
+		public StorageObjectDataWriter()
+		{
+			super(ess, getStorageFile());
+		}
+
+		@Override
+		public StorageObject getObject()
+		{
+			acquireReadLock();
+			return getData();
+		}
+
+		@Override
+		public void onFinish()
+		{
+			unlock();
+		}
+	}
+
+
+	private class StorageObjectDataReader extends AbstractDelayedYamlFileReader<T>
+	{
+		public StorageObjectDataReader()
+		{
+			super(ess, getStorageFile(), clazz);
+		}
+
+		@Override
+		public void onStart()
+		{
+			rwl.writeLock().lock();
+		}
+
+		@Override
+		public void onSuccess(final T object)
+		{
+			if (object != null)
+			{
+				data = object;
+			}
+			rwl.writeLock().unlock();
+		}
+
+		@Override
+		public void onException()
+		{
+			if (data == null)
+			{
+				try
+				{
+					data = clazz.newInstance();
+				}
+				catch (Exception ex)
+				{
+					Bukkit.getLogger().log(Level.SEVERE, ex.getMessage(), ex);
+				}
+			}
+			rwl.writeLock().unlock();
+		}
+	}
+}

Essentials/src/com/earth2me/essentials/storage/IStorageObjectHolder.java

@@ -0,0 +1,17 @@
+package com.earth2me.essentials.storage;
+
+import com.earth2me.essentials.user.UserData;
+
+
+public interface IStorageObjectHolder<T extends StorageObject>
+{
+	T getData();
+
+	void acquireReadLock();
+
+	void acquireWriteLock();
+
+	void close();
+
+	void unlock();
+}

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

@@ -1,7 +1,9 @@
 package com.earth2me.essentials.user;
 
+import com.earth2me.essentials.storage.IStorageObjectHolder;
 
-public interface IOfflineUser extends IUserData, IOfflinePlayer
+
+public interface IOfflineUser extends IStorageObjectHolder<UserData>, IOfflinePlayer
 {
 	
 }

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

@@ -1,13 +0,0 @@
-package com.earth2me.essentials.user;
-
-
-public interface IUserData
-{
-	UserData getData();
-
-	void aquireReadLock();
-
-	void aquireWriteLock();
-
-	void close();
-}

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

@@ -1,19 +1,16 @@
 package com.earth2me.essentials.user;
 
 import com.earth2me.essentials.IEssentials;
-import com.earth2me.essentials.storage.AbstractDelayedYamlFileWriter;
-import com.earth2me.essentials.storage.StorageObject;
-import java.util.concurrent.locks.ReentrantReadWriteLock;
+import com.earth2me.essentials.IUser;
+import com.earth2me.essentials.commands.IEssentialsCommand;
 import lombok.Cleanup;
+import org.bukkit.Location;
 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 class User extends UserBase implements IUser
+{
 	public User(final Player base, final IEssentials ess)
 	{
 		super(base, ess);
@@ -24,43 +21,6 @@ public class User extends UserBase implements IOfflineUser
 		super(offlinePlayer, ess);
 	}
 
-	@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
@@ -68,37 +28,151 @@ public class User extends UserBase implements IOfflineUser
 		final User user = this;
 
 		// read lock allows to read data from the user
-		user.aquireReadLock();
+		user.acquireReadLock();
 		final double money = user.getData().getMoney();
 
 		// write lock allows only one thread to modify the data
-		user.aquireWriteLock();
+		user.acquireWriteLock();
 		user.getData().setMoney(10 + money);
 	}
 
-	private void scheduleSaving()
+	@Override
+	public long getLastTeleportTimestamp()
 	{
-		new UserDataWriter();
+		acquireReadLock();
+		try
+		{
+			return getData().getTimestamps().get("lastteleport");
+		}
+		finally
+		{
+			unlock();
+		}
 	}
 
-	private class UserDataWriter extends AbstractDelayedYamlFileWriter
+	@Override
+	public boolean isAuthorized(String node)
 	{
-		public UserDataWriter()
-		{
-			super(ess, ess.getUserMap().getUserFile(User.this.getName()));
-		}
+		throw new UnsupportedOperationException("Not supported yet.");
+	}
 
-		@Override
-		public StorageObject getObject()
-		{
-			aquireReadLock();
-			return getData();
-		}
+	@Override
+	public boolean isAuthorized(IEssentialsCommand cmd)
+	{
+		throw new UnsupportedOperationException("Not supported yet.");
+	}
 
-		@Override
-		public void onFinish()
+	@Override
+	public boolean isAuthorized(IEssentialsCommand cmd, String permissionPrefix)
+	{
+		throw new UnsupportedOperationException("Not supported yet.");
+	}
+
+	@Override
+	public void setLastTeleportTimestamp(long time)
+	{
+		acquireWriteLock();
+		try
 		{
-			close();
+			getData().getTimestamps().put("lastteleport", time);
 		}
+		finally
+		{
+			unlock();
+		}
+	}
+
+	@Override
+	public Location getLastLocation()
+	{
+		acquireReadLock();
+		try
+		{
+			return getData().getLastLocation();
+		}
+		finally
+		{
+			unlock();
+		}
+	}
+
+	@Override
+	public double getMoney()
+	{
+		acquireReadLock();
+		try
+		{
+			return getData().getMoney();
+		}
+		finally
+		{
+			unlock();
+		}
+	}
+
+	@Override
+	public void takeMoney(double value)
+	{
+		acquireWriteLock();
+		try
+		{
+			getData().setMoney(getData().getMoney() - value);
+		}
+		finally
+		{
+			unlock();
+		}
+	}
+
+	@Override
+	public void giveMoney(double value)
+	{
+		acquireWriteLock();
+		try
+		{
+			getData().setMoney(getData().getMoney() + value);
+		}
+		finally
+		{
+			unlock();
+		}
+	}
+
+	@Override
+	public String getGroup()
+	{
+		throw new UnsupportedOperationException("Not supported yet.");
+	}
+
+	@Override
+	public void setLastLocation()
+	{
+		acquireWriteLock();
+		try
+		{
+			getData().setLastLocation(base.getLocation());
+		}
+		finally
+		{
+			unlock();
+		}
+	}
+
+	@Override
+	public Location getHome(String name) throws Exception
+	{
+		throw new UnsupportedOperationException("Not supported yet.");
+	}
+
+	@Override
+	public Location getHome(Location loc) throws Exception
+	{
+		throw new UnsupportedOperationException("Not supported yet.");
+	}
+
+	@Override
+	public boolean isHidden()
+	{
+		throw new UnsupportedOperationException("Not supported yet.");
 	}
 }

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

@@ -2,6 +2,8 @@ package com.earth2me.essentials.user;
 
 import com.earth2me.essentials.IEssentials;
 import com.earth2me.essentials.craftbukkit.OfflineBedLocation;
+import com.earth2me.essentials.storage.AsyncStorageObjectHolder;
+import java.io.File;
 import lombok.Delegate;
 import org.bukkit.Bukkit;
 import org.bukkit.Location;
@@ -16,7 +18,7 @@ import org.bukkit.permissions.ServerOperator;
 import org.bukkit.OfflinePlayer;
 
 
-public class UserBase implements Player, IOfflinePlayer
+public class UserBase extends AsyncStorageObjectHolder<UserData> implements Player, IOfflineUser
 {
 	
 	@Delegate(types =
@@ -27,18 +29,19 @@ public class UserBase implements Player, IOfflinePlayer
 	},excludes=IOfflinePlayer.class)
 	protected Player base;
 	protected transient OfflinePlayer offlinePlayer;
-	protected final transient IEssentials ess;
 
 	public UserBase(final Player base, final IEssentials ess)
 	{
+		super(ess, UserData.class);
 		this.base = base;
-		this.ess = ess;
+		reloadConfig();
 	}
 	
 	public UserBase(final OfflinePlayer offlinePlayer, final IEssentials ess)
 	{
+		super(ess, UserData.class);
 		this.offlinePlayer = offlinePlayer;
-		this.ess = ess;
+		reloadConfig();
 	}
 
 	public final Player getBase()
@@ -111,5 +114,9 @@ public class UserBase implements Player, IOfflinePlayer
 		}
 	}
 
-	
+	@Override
+	public File getStorageFile()
+	{
+		return ess.getUserMap().getUserFile(getName());
+	}
 }

EssentialsSpawn/src/com/earth2me/essentials/spawn/SpawnStorage.java

@@ -1,57 +1,46 @@
 package com.earth2me.essentials.spawn;
 
-import com.earth2me.essentials.IConf;
 import com.earth2me.essentials.IEssentials;
 import com.earth2me.essentials.IEssentialsModule;
 import com.earth2me.essentials.settings.Spawns;
-import com.earth2me.essentials.storage.AbstractDelayedYamlFileReader;
-import com.earth2me.essentials.storage.AbstractDelayedYamlFileWriter;
-import com.earth2me.essentials.storage.ObjectLoadException;
-import com.earth2me.essentials.storage.StorageObject;
+import com.earth2me.essentials.storage.AsyncStorageObjectHolder;
 import java.io.File;
 import java.util.HashMap;
 import java.util.Locale;
 import java.util.Map;
-import java.util.concurrent.locks.ReentrantReadWriteLock;
-import org.bukkit.Bukkit;
 import org.bukkit.Location;
 import org.bukkit.World;
 
 
-public class SpawnStorage implements IConf, IEssentialsModule
+public class SpawnStorage extends AsyncStorageObjectHolder<Spawns> implements IEssentialsModule
 {
-	private transient Spawns spawns;
-	private final transient IEssentials ess;
-	private final transient File spawnfile;
-	private final transient ReentrantReadWriteLock rwl = new ReentrantReadWriteLock();
-
 	public SpawnStorage(final IEssentials ess)
 	{
-		this.ess = ess;
-		spawnfile = new File(ess.getDataFolder(), "spawn.yml");
-		new SpawnReader();
+		super(ess, Spawns.class);
+		reloadConfig();
+	}
+
+	@Override
+	public File getStorageFile()
+	{
+		return new File(ess.getDataFolder(), "spawn.yml");
 	}
 
 	public void setSpawn(final Location loc, final String group)
 	{
-		rwl.writeLock().lock();
+		acquireWriteLock();
 		try
 		{
-			if (spawns == null)
+			if (getData().getSpawns() == null)
 			{
-				spawns = new Spawns();
+				getData().setSpawns(new HashMap<String, Location>());
 			}
-			if (spawns.getSpawns() == null)
-			{
-				spawns.setSpawns(new HashMap<String, Location>());
-			}
-			spawns.getSpawns().put(group.toLowerCase(Locale.ENGLISH), loc);
+			getData().getSpawns().put(group.toLowerCase(Locale.ENGLISH), loc);
 		}
 		finally
 		{
-			rwl.writeLock().unlock();
+			unlock();
 		}
-		new SpawnWriter();
 
 		if ("default".equalsIgnoreCase(group))
 		{
@@ -61,14 +50,14 @@ public class SpawnStorage implements IConf, IEssentialsModule
 
 	public Location getSpawn(final String group)
 	{
-		rwl.readLock().lock();
+		acquireReadLock();
 		try
 		{
-			if (spawns == null || spawns.getSpawns() == null || group == null)
+			if (getData().getSpawns() == null || group == null)
 			{
 				return getWorldSpawn();
 			}
-			final Map<String, Location> spawnMap = spawns.getSpawns();
+			final Map<String, Location> spawnMap = getData().getSpawns();
 			String groupName = group.toLowerCase(Locale.ENGLISH);
 			if (!spawnMap.containsKey(groupName))
 			{
@@ -82,7 +71,7 @@ public class SpawnStorage implements IConf, IEssentialsModule
 		}
 		finally
 		{
-			rwl.readLock().unlock();
+			unlock();
 		}
 	}
 
@@ -98,66 +87,4 @@ public class SpawnStorage implements IConf, IEssentialsModule
 		}
 		return ess.getServer().getWorlds().get(0).getSpawnLocation();
 	}
-
-	@Override
-	public void reloadConfig()
-	{
-		new SpawnReader();
-	}
-
-
-	private class SpawnWriter extends AbstractDelayedYamlFileWriter
-	{
-		public SpawnWriter()
-		{
-			super(ess, spawnfile);
-		}
-
-		@Override
-		public StorageObject getObject()
-		{
-			rwl.readLock().lock();
-			return spawns;
-		}
-
-		@Override
-		public void onFinish()
-		{
-			rwl.readLock().unlock();
-		}
-	}
-
-
-	private class SpawnReader extends AbstractDelayedYamlFileReader<Spawns>
-	{
-		public SpawnReader()
-		{
-			super(ess, spawnfile, Spawns.class);
-		}
-
-		@Override
-		public void onStart()
-		{
-			rwl.writeLock().lock();
-		}
-
-		@Override
-		public void onSuccess(final Spawns object)
-		{
-			if (object != null)
-			{
-				spawns = object;
-			}
-			rwl.writeLock().unlock();
-		}
-
-		@Override
-		public void onException()
-		{
-			if (spawns == null) {
-				spawns = new Spawns();
-			}
-			rwl.writeLock().unlock();
-		}
-	}
 }