Use file system pusher.

src/com/massivecraft/massivecore/MassiveCore.java

@@ -50,7 +50,8 @@ import com.massivecraft.massivecore.mson.Mson;
 import com.massivecraft.massivecore.mson.MsonEvent;
 import com.massivecraft.massivecore.ps.PS;
 import com.massivecraft.massivecore.ps.PSAdapter;
-import com.massivecraft.massivecore.store.ExamineThread;
+import com.massivecraft.massivecore.store.ModificationPollerLocal;
+import com.massivecraft.massivecore.store.ModificationPollerRemote;
 import com.massivecraft.massivecore.teleport.EngineScheduledTeleport;
 import com.massivecraft.massivecore.util.IdUtil;
 import com.massivecraft.massivecore.util.MUtil;
@@ -173,9 +174,6 @@ public class MassiveCore extends MassivePlugin
 		// TODO: Test and ensure reload compat.
 		// Coll.instances.clear();
 		
-		// Start the examine thread
-		ExamineThread.get().start();
-		
 		if ( ! preEnable()) return;
 		
 		// Load Server Config
@@ -202,6 +200,11 @@ public class MassiveCore extends MassivePlugin
 		AspectColl.get().init();
 		MassiveCoreMConfColl.get().init();
 		
+		// Start the examine threads
+		// Start AFTER initializing the MConf, because they rely on the MConf.
+		ModificationPollerLocal.get().start();
+		ModificationPollerRemote.get().start();
+		
 		// Register commands
 		this.outerCmdMassiveCore = new CmdMassiveCore() { public List<String> getAliases() { return MassiveCoreMConf.get().aliasesOuterMassiveCore; } };
 		this.outerCmdMassiveCore.register(this);
@@ -234,7 +237,9 @@ public class MassiveCore extends MassivePlugin
 	public void onDisable()
 	{
 		super.onDisable();
-		ExamineThread.get().interrupt();
+		ModificationPollerLocal.get().interrupt();
+		ModificationPollerRemote.get().interrupt();
+		
 		MassiveCoreTaskDeleteFiles.get().run();
 		IdUtil.saveCachefileDatas();
 	}

src/com/massivecraft/massivecore/MassiveCoreMConf.java

@@ -95,4 +95,13 @@ public class MassiveCoreMConf extends Entity<MassiveCoreMConf>
 	public String variableBuffer = "***buffer***";
 	public boolean usingVariableBuffer = true;
 	
+	// -------------------------------------------- //
+	// MSTORE CONFIGURATON
+	// -------------------------------------------- //
+	
+	public volatile long millisBetweenLocalPoll = 1000;
+	public volatile long millisBetweenLocalPollColl = 100;
+	
+	public volatile long millisBetweenRemotePoll = 1000;
+	public volatile long millisBetweenRemotePollColl = 100;
 }

src/com/massivecraft/massivecore/command/massivecore/CmdMassiveCoreStoreStats.java

@@ -8,7 +8,6 @@ import com.massivecraft.massivecore.command.MassiveCommand;
 import com.massivecraft.massivecore.command.requirement.RequirementHasPerm;
 import com.massivecraft.massivecore.command.type.store.TypeColl;
 import com.massivecraft.massivecore.store.Coll;
-import com.massivecraft.massivecore.store.ExamineThread;
 import com.massivecraft.massivecore.util.MUtil;
 import com.massivecraft.massivecore.util.Txt;
 
@@ -51,7 +50,7 @@ public class CmdMassiveCoreStoreStats extends MassiveCommand
 	public void performTotal()
 	{
 		msg(Txt.titleize("MStore Total Statistics"));
-		msg("<k>Last Examine Duration: <v>%d<i>ms", ExamineThread.get().getLastDurationMillis());
+		//msg("<k>Last Examine Duration: <v>%d<i>ms", ExamineThread.get().getLastDurationMillis());
 		msg("<a>== <k>Coll <a>| <k>Sync Count In <a>| <k>Sync Count Out <a>==");
 		for (Entry<String, Coll<?>> entry : Coll.getMap().entrySet())
 		{

src/com/massivecraft/massivecore/store/Coll.java

@@ -4,7 +4,6 @@ import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Comparator;
-import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
@@ -94,6 +93,33 @@ public class Coll<E> extends CollAbstract<E>
 	protected Object collDriverObject;
 	@Override public Object getCollDriverObject() { return this.collDriverObject; }
 	
+	@Override
+	public boolean supportsPusher()
+	{
+		return this.getDb().supportsPusher();
+	}
+	
+	protected PusherColl pusher;
+	
+	@Override
+	public PusherColl getPusher()
+	{
+		if (this.pusher == null) this.pusher = this.getDb().getPusher(this);
+		return this.pusher;
+	}
+	
+	public String getDebugName()
+	{
+		String ret = this.getPlugin().getName() + "::" + this.getBasename();
+		
+		if (this.getUniverse() != null)
+		{
+			ret += "@" + this.getUniverse();
+		}
+		
+		return ret;
+	}
+	
 	// -------------------------------------------- //
 	// STORAGE
 	// -------------------------------------------- //
@@ -163,14 +189,25 @@ public class Coll<E> extends CollAbstract<E>
 	@Override public boolean isLowercasing() { return this.lowercasing; }
 	@Override public void setLowercasing(boolean lowercasing) { this.lowercasing = lowercasing; }
 	
+	protected int localPollFrequency = 5;
+	@Override public int getLocalPollFrequency() { return this.localPollFrequency; }
+	@Override public void setLocalPollFrequency(int frequency) { this.localPollFrequency = frequency; }
+	
+	// We often try to call Entity#changed to inform that an entity has been changed locally.
+	// And on some Colls we expect it to always be done.
+	// However we cannot be sure, but if we expect to always do it
+	// then we tell the collection to notify us if we failed to call Entity#changed.
+	protected boolean warnOnLocalAlter = false;
+	@Override public boolean isWarningOnLocalAlter() { return this.warnOnLocalAlter; }
+	@Override public void setWarnOnLocalAlter(boolean warnOnLocalAlter) { this.warnOnLocalAlter = warnOnLocalAlter; }
+	
 	// Should that instance be saved or not?
 	// If it is default it should not be saved.
-	@SuppressWarnings("rawtypes")
 	@Override public boolean isDefault(E entity)
 	{
 		if (entity instanceof Entity)
 		{
-			return ((Entity)entity).isDefault();
+			return ((Entity<?>)entity).isDefault();
 		}
 		else
 		{
@@ -215,8 +252,6 @@ public class Coll<E> extends CollAbstract<E>
 	
 	// This simply creates and returns a new instance
 	// It does not detach/attach or anything. Just creates a new instance.
-	// TODO: Would it ever make sense for this to fail?
-	// Should we just throw an exception immediately if it fails?
 	@Override
 	public E createNewInstance()
 	{
@@ -291,35 +326,37 @@ public class Coll<E> extends CollAbstract<E>
 		this.id2entity.put(id, entity);
 		this.entity2id.put(entity, id);
 		
+		EntityMeta meta = new EntityMeta();
+		
 		// Identify Modification
 		if (noteModification)
 		{
 			this.identifiedModifications.put(id, Modification.LOCAL_ATTACH);
 		}
 		
+		this.metaData.put(id, meta);
+		
 		// POST
 		this.postAttach(entity, id);
 		
 		return id;
 	}
 	
-	@SuppressWarnings("unchecked")
 	@Override
-	public E detachEntity(Object entity)
+	public E detachEntity(E entity)
 	{
 		if (entity == null) throw new NullPointerException("entity");
 
-		E e = (E)entity;
+		String id = this.getId(entity);
-		String id = this.getId(e);
 		if (id == null)
 		{
 			// It seems the entity is already detached.
 			// In such case just silently return it.
-			return e;
+			return entity;
 		}
 		
-		this.detachFixed(e, id);
+		this.detachFixed(entity, id);
-		return e;
+		return entity;
 	}
 	
 	@Override
@@ -394,6 +431,15 @@ public class Coll<E> extends CollAbstract<E>
 	
 	protected Map<String, Modification> identifiedModifications;
 	
+	protected synchronized void putIdentifiedModificationFixed(String id, Modification modification)
+	{
+		if (id == null) throw new NullPointerException("id");
+		if (modification == null) throw new NullPointerException("modification");
+		Modification old = this.identifiedModifications.get(id);
+		if (old != null && modification.getPriority() <= old.getPriority()) return;
+		this.identifiedModifications.put(id, modification);
+	}
+	
 	protected synchronized void removeIdentifiedModificationFixed(String id)
 	{
 		if (id == null) throw new NullPointerException("id");
@@ -405,17 +451,25 @@ public class Coll<E> extends CollAbstract<E>
 	// -------------------------------------------- //
 	
 	// The strings are the ids.
-	protected Map<String, Long> lastMtime;
+	protected Map<String, EntityMeta> metaData;
-	protected Map<String, JsonElement> lastRaw;
-	protected Set<String> lastDefault;
 	
-	protected synchronized void clearSynclogFixed(String id)
+	protected EntityMeta getMetaFixed(String id)
 	{
 		if (id == null) throw new NullPointerException("id");
+		EntityMeta meta = this.metaData.get(id);
+		if (meta == null)
+		{
+			meta = new EntityMeta();
+			this.metaData.put(id, meta);
+		}
+		return meta;
+	}
 	
-		this.lastMtime.remove(id);
+	protected EntityMeta setMetaFixed(String id, EntityMeta meta)
-		this.lastRaw.remove(id);
+	{
-		this.lastDefault.remove(id);
+		if (id == null) throw new NullPointerException("id");
+		if (meta == null) return this.metaData.remove(id);
+		else return this.metaData.put(id, meta);
 	}
 
 	// Log database synchronization for display in the "/massivecore mstore stats" command.
@@ -455,7 +509,7 @@ public class Coll<E> extends CollAbstract<E>
 		if (id == null) throw new NullPointerException("id");
 		
 		this.removeIdentifiedModificationFixed(id);
-		this.clearSynclogFixed(id);
+		this.setMetaFixed(id, null);
 		
 		E entity = this.id2entity.remove(id);
 		if (entity == null) return null;
@@ -478,7 +532,7 @@ public class Coll<E> extends CollAbstract<E>
 		if (id == null) throw new NullPointerException("id");
 		
 		this.removeIdentifiedModificationFixed(id);
-		this.clearSynclogFixed(id);
+		this.setMetaFixed(id, null);
 		
 		this.getDb().delete(this, id);
 	}
@@ -489,28 +543,31 @@ public class Coll<E> extends CollAbstract<E>
 		if (id == null) throw new NullPointerException("id");
 		
 		this.removeIdentifiedModificationFixed(id);
-		this.clearSynclogFixed(id);
+		this.setMetaFixed(id, null);
 		
 		E entity = this.id2entity.get(id);
 		if (entity == null) return;
 		
+		EntityMeta meta = this.getMetaFixed(id);
+		
 		JsonElement raw = this.getGson().toJsonTree(entity, this.getEntityClass());
-		this.lastRaw.put(id, raw);
+		meta.setLastRaw(raw);
 		
 		if (this.isDefault(entity))
 		{
 			this.getDb().delete(this, id);
-			this.lastDefault.add(id);
+			meta.setDefault(true);
 		}
 		else
 		{
 			long mtime = this.getDb().save(this, id, raw);
-			if (mtime == 0) return; // This fail should not happen often. We could handle it better though.
+			// TODO: This fail should not happen often. We could handle it better though.
-			this.lastMtime.put(id, mtime);
+			// Perhaps we should log it, or simply try again.
+			if (mtime == 0) return;
+			meta.setMtime(mtime);
 		}
 	}
 	
-	@SuppressWarnings("unchecked")
 	@Override
 	public synchronized void loadFromRemoteFixed(String id, Entry<JsonElement, Long> remoteEntry)
 	{
@@ -531,42 +588,13 @@ public class Coll<E> extends CollAbstract<E>
 			}
 		}
 		
-		Long mtime = remoteEntry.getValue();
-		if (mtime == null)
-		{
-			logLoadError(id, "Last modification time (mtime) was null. The file might not be readable or simply not exist.");
-			return;
-		}
-		
-		if (mtime == 0)
-		{
-			logLoadError(id, "Last modification time (mtime) was 0. The file might not be readable or simply not exist.");
-			return;
-		}
-		
 		JsonElement raw = remoteEntry.getKey();
-		if (raw == null)
+		Long mtime = remoteEntry.getValue();
-		{
+		if ( ! this.remoteEntryIsOk(id, remoteEntry)) return;
-			logLoadError(id, "Raw data was null. Is the file completely empty?");
-			return;
-		}
-		if (raw.isJsonNull())
-		{
-			logLoadError(id, "Raw data was JSON null. It seems you have a file containing just the word \"null\". Why would you do this?");
-			return;
-		}
 		
 		// Calculate temp but handle raw cases.
-		E temp = null;
+		E temp = this.getGson().fromJson(raw, this.getEntityClass());
-		if (this.getEntityClass().isAssignableFrom(JsonObject.class))
+		E entity = this.getFixed(id, false);
-		{
-			temp = (E) raw;
-		}
-		else
-		{
-			temp = this.getGson().fromJson(raw, this.getEntityClass());
-		}
-		E entity = this.get(id, false);
 		if (entity != null)
 		{
 			// It did already exist
@@ -584,9 +612,41 @@ public class Coll<E> extends CollAbstract<E>
 			this.attach(entity, id, false);
 		}
 		
-		this.lastRaw.put(id, raw);
+		EntityMeta meta = this.getMetaFixed(id);
-		this.lastMtime.put(id, mtime);
+		
-		this.lastDefault.remove(id);
+		meta.setLastRaw(raw);
+		meta.setMtime(mtime);
+		meta.setDefault(false);
+	}
+	
+	public boolean remoteEntryIsOk(String id, Entry<JsonElement, Long> remoteEntry)
+	{
+		Long mtime = remoteEntry.getValue();
+		if (mtime == null)
+		{
+			this.logLoadError(id, "Last modification time (mtime) was null. The file might not be readable or simply not exist.");
+			return false;
+		}
+		
+		if (mtime == 0)
+		{
+			this.logLoadError(id, "Last modification time (mtime) was 0. The file might not be readable or simply not exist.");
+			return false;
+		}
+		
+		JsonElement raw = remoteEntry.getKey();
+		if (raw == null)
+		{
+			this.logLoadError(id, "Raw data was null. Is the file completely empty?");
+			return false;
+		}
+		if (raw.isJsonNull())
+		{
+			this.logLoadError(id, "Raw data was JSON null. It seems you have a file containing just the word \"null\". Why would you do this?");
+			return false;
+		}
+		
+		return true;
 	}
 	
 	public void logLoadError(String entityId, String error)
@@ -605,16 +665,16 @@ public class Coll<E> extends CollAbstract<E>
 	public Modification examineIdFixed(String id, Long remoteMtime)
 	{
 		if (id == null) throw new NullPointerException("id");
-		// Local Attach and Detach has the top priority.
+		// Meta might be non-existing. But then we create it here.
-		// Otherwise newly attached entities would be removed thinking it was a remote detach.
+		// If it is examined then it will be attached anyways.
-		// Otherwise newly detached entities would be loaded thinking it was a remote attach.
+		EntityMeta meta = this.getMetaFixed(id);
-		Modification ret = this.identifiedModifications.get(id);
+		Modification current = this.identifiedModifications.get(id);
 		// DEBUG
 		// if (Bukkit.isPrimaryThread())
 		// {
 		// 	MassiveCore.get().log(Txt.parse("<a>examineId <k>Coll: <v>%s <k>Entity: <v>%s <k>Modification: <v>%s", this.getName(), id, ret));
 		// }
-		if (ret == Modification.LOCAL_ATTACH || ret == Modification.LOCAL_DETACH) return ret;
+		if (current != null && current.hasTopPriority()) return current;
 		
 		E localEntity = this.id2entity.get(id);
 		if (remoteMtime == null)
@@ -626,42 +686,118 @@ public class Coll<E> extends CollAbstract<E>
 		boolean existsLocal = (localEntity != null);
 		boolean existsRemote = (remoteMtime != 0);
 		
+		// So we don't have this anywhere?
 		if ( ! existsLocal && ! existsRemote) return Modification.UNKNOWN;
 		
+		// If we have it both locally and remotely.
 		if (existsLocal && existsRemote)
 		{
-			Long lastMtime = this.lastMtime.get(id);
+			long lastMtime = meta.getMtime();
-			if (remoteMtime.equals(lastMtime) == false) return Modification.REMOTE_ALTER;
 			
+			// If mtime is not equal remote takes priority, and we assume it is altered.
+			if ( ! remoteMtime.equals(lastMtime)) return Modification.REMOTE_ALTER;
+			
+			// Else we check for a local alter.
 			if (this.examineHasLocalAlterFixed(id, localEntity)) return Modification.LOCAL_ALTER;
 		}
+		// If we just have it locally...
 		else if (existsLocal)
 		{
-			if (this.lastDefault.contains(id))
+			// ...and it was default and thus not saved to the db...
+			if (meta.isDefault())
 			{
+				// ...and also actually altered.
+				// Then it is a local alter.
 				if (this.examineHasLocalAlterFixed(id, localEntity)) return Modification.LOCAL_ALTER;
 			}
+			// ...otherwise it was detached remotely.
 			else
 			{
 				return Modification.REMOTE_DETACH;
 			}
 		}
+		// If we just have it remotely. It was attached there.
 		else if (existsRemote)
 		{
 			return Modification.REMOTE_ATTACH;
 		}
 		
+		// No modification was made.
 		return Modification.NONE;
 	}
 	
+	@Override
+	public Modification examineIdLocalFixed(final String id)
+	{
+		if (id == null) throw new NullPointerException("id");
+		
+		// A local entity should have a meta.
+		Modification current = this.identifiedModifications.get(id);
+		if (current != null && current.hasTopPriority()) return current;
+		
+		E localEntity = this.id2entity.get(id);
+		
+		// If not existing, then wtf.
+		if (localEntity == null) return Modification.UNKNOWN;
+		
+		// Altered locally.
+		if (this.examineHasLocalAlterFixed(id, localEntity)) return Modification.LOCAL_ALTER;
+		
+		// Not altered locally.
+		return Modification.NONE;
+	}
+	
+	@Override
+	public Modification examineIdRemoteFixed(final String id, Long remoteMtime)
+	{
+		if (id == null) throw new NullPointerException("id");
+		
+		// We will always know beforehand, when local attach and detach is done.
+		// Because they are performed by calling a method on this coll.
+		// Meta might be non-existing. But then we create it here.
+		// If it is examined then it will be attached anyways.
+		EntityMeta meta = this.getMetaFixed(id);
+		Modification current = this.identifiedModifications.get(id);
+		if (current != null && current.hasTopPriority()) return current;
+		
+		if (remoteMtime == null)
+		{
+			// TODO: This is slow
+			remoteMtime = this.getDb().getMtime(this, id);
+		}
+		E localEntity = this.id2entity.get(id);
+		
+		boolean existsLocal = (localEntity != null);
+		boolean existsRemote = (remoteMtime != 0);
+		
+		// So we don't have this anywhere?
+		if ( ! existsLocal && ! existsRemote) return Modification.UNKNOWN;
+		
+		Long lastMtime = meta.getMtime();
+		
+		// If time is different
+		// then it is remotely altered
+		if (existsLocal && existsRemote && ! lastMtime.equals(remoteMtime)) return Modification.REMOTE_ALTER;
+		
+		// If it doesn't exist remotely, and it wasn't because it was default. It was detached remotely.
+		if (!existsRemote && ! meta.isDefault()) return Modification.REMOTE_DETACH;
+		
+		// If it doesn't exist locally, it was attached remotely.
+		if (!existsLocal) return Modification.REMOTE_ATTACH;
+		
+		// No modification spotted.
+		return Modification.NONE;
+		
+	}
+	
 	protected boolean examineHasLocalAlterFixed(String id, E entity)
 	{
-		JsonElement lastRaw = this.lastRaw.get(id);
+		JsonElement lastRaw = this.getMetaFixed(id).getLastRaw();
 		JsonElement currentRaw = null;
 		
 		try
 		{
-			currentRaw = this.getGson().toJsonTree(entity, this.getEntityClass());
+			currentRaw = this.getGson().toJsonTree(entity);
 		}
 		catch (Exception e)
 		{
@@ -686,6 +822,8 @@ public class Coll<E> extends CollAbstract<E>
 			
 			modification = this.examineIdFixed(id, remoteMtime);
 		}
+		if (MStore.DEBUG_ENABLED) System.out.println(this.getDebugName() + " syncronising " + modification + " on " + id);
+		
 		
 		// DEBUG
 		// MassiveCore.get().log(Txt.parse("<a>syncId <k>Coll: <v>%s <k>Entity: <v>%s <k>Modification: <v>%s", this.getName(), id, modification));
@@ -735,41 +873,118 @@ public class Coll<E> extends CollAbstract<E>
 	}
 	
 	@Override
-	public void identifyModifications()
+	public void identifyModifications(boolean sure)
 	{
+		if (MStore.DEBUG_ENABLED) System.out.println(this.getDebugName() + " polling for all changes");
+		
 		// Get remote id2mtime snapshot
 		Map<String, Long> id2RemoteMtime = this.getDb().getId2mtime(this);
 		
-		// Compile a list of all ids (both remote and local)
+		// Java 8
-		Set<String> allids = new HashSet<String>();
+		//this.id2entity.keySet().forEach(id -> id2RemoteMtime.putIfAbsent(id, 0));
-		allids.addAll(id2RemoteMtime.keySet());
+		
-		allids.addAll(this.id2entity.keySet());
+		// Java 8 >
+		for (String id : this.id2entity.keySet())
+		{
+			if (id2RemoteMtime.containsKey(id)) continue;
+			id2RemoteMtime.put(id,  0L);
+		}
 		
 		// Check for modifications
-		for (String id : allids)
+		for (Entry<String, Long> entry : id2RemoteMtime.entrySet())
 		{
-			Long remoteMtime = id2RemoteMtime.get(id);
+			this.identifyModificationFixed(entry.getKey(), entry.getValue(), sure);
-			if (remoteMtime == null) remoteMtime = 0L;
-			
-			Modification modification = this.examineIdFixed(id, remoteMtime);
-			if (modification.isModified())
-			{
-				this.identifiedModifications.put(id, modification);
-			}
 		}
 	}
 	
 	@Override
-	public void syncIdentified(boolean safe)
+	public void identifyModificationFixed(String id, Long remoteMtime, boolean sure)
+	{
+		if (id == null) throw new NullPointerException("id");
+		
+		Modification modification = this.examineIdFixed(id, remoteMtime);
+		this.storeModificationIdentification(id, modification, sure);
+	}
+	
+	@Override
+	public void identifyLocalModifications(boolean sure)
+	{
+		if (MStore.DEBUG_ENABLED) System.out.println(this.getDebugName() + " polling for local changes");
+		for (String id : id2entity.keySet())
+		{
+			this.identifyLocalModificationFixed(id, sure);
+		}
+	}
+	
+	@Override
+	public void identifyLocalModificationFixed(String id, boolean sure)
+	{
+		if (id == null) throw new NullPointerException("id");
+		
+		Modification modification = this.examineIdLocalFixed(id);
+		this.storeModificationIdentification(id, modification, sure);
+	}
+	
+	@Override
+	public void identifyRemoteModifications(boolean sure)
+	{
+		if (MStore.DEBUG_ENABLED) System.out.println(this.getDebugName() + " polling for remote changes");
+		// Get remote id2mtime snapshot
+		Map<String, Long> id2RemoteMtime = this.getDb().getId2mtime(this);
+		
+		//Note: We must also check local ids, in case of remote detach.
+		
+		// Java 8
+		//this.id2entity.keySet().forEach(id -> id2RemoteMtime.putIfAbsent(id, 0));
+		
+		// Java 8 >
+		for (String id : this.id2entity.keySet())
+		{
+			if (id2RemoteMtime.containsKey(id)) continue;
+			id2RemoteMtime.put(id,  0L);
+		}
+		
+		// Check for modifications
+		for (Entry<String, Long> entry : id2RemoteMtime.entrySet())
+		{
+			this.identifyRemoteModificationFixed(entry.getKey(), entry.getValue(), sure);
+		}
+	}
+	
+	@Override
+	public void identifyRemoteModificationFixed(String id, Long remoteMtime, boolean sure)
+	{
+		if (id == null) throw new NullPointerException("id");
+		
+		Modification modification = this.examineIdRemoteFixed(id, remoteMtime);
+		this.storeModificationIdentification(id, modification, sure);
+	}
+	
+	protected void storeModificationIdentification(String id, Modification modification, boolean sure)
+	{
+		if (this.isWarningOnLocalAlter() && modification == Modification.LOCAL_ALTER)
+		{
+			MassiveCore.get().log(
+				"A local alter was made in " + this.getName() + " on " + id,
+				"This was unintended, the developers should be informed."
+				);
+		}
+		
+		if (modification.isModified())
+		{
+			if (MStore.DEBUG_ENABLED) System.out.println(this.getDebugName() + " identified " + modification + " on " + id);
+			if (!sure && ! modification.isSafe()) modification = Modification.UNKNOWN;
+			this.putIdentifiedModificationFixed(id, modification);
+		}
+	}
+	
+	@Override
+	public void syncIdentified()
 	{
 		for (Entry<String, Modification> entry : this.identifiedModifications.entrySet())
 		{
 			String id = entry.getKey();
 			Modification modification = entry.getValue();
-			if (safe)
-			{
-				modification = null;
-			}
 			this.syncIdFixed(id, modification);
 		}
 	}
@@ -777,8 +992,8 @@ public class Coll<E> extends CollAbstract<E>
 	@Override
 	public void syncAll()
 	{
-		this.identifyModifications();
+		this.identifyModifications(true);
-		this.syncIdentified(false);
+		this.syncIdentified();
 	}
 	
 	@Override
@@ -804,7 +1019,7 @@ public class Coll<E> extends CollAbstract<E>
 	@Override
 	public void onTick()
 	{
-		this.syncIdentified(true);
+		this.syncIdentified();
 	}
 	
 	// -------------------------------------------- //
@@ -841,14 +1056,10 @@ public class Coll<E> extends CollAbstract<E>
 		this.id2entity = (sorted) ? new ConcurrentSkipListMap<String, E>(NaturalOrderComparator.get()) : new ConcurrentHashMap<String, E>();
 		this.entity2id = (Entity.class.isAssignableFrom(entityClass) && sorted) ? new ConcurrentSkipListMap<E, String>((Comparator<? super E>) ComparatorEntityId.get()) : new ConcurrentHashMap<E, String>();
 		
-		// IDENTIFIED MODIFICATIONS
+		// ENTITY DATA
+		this.metaData = new ConcurrentHashMap<String, EntityMeta>();
 		this.identifiedModifications = new ConcurrentHashMap<String, Modification>();
 		
-		// SYNCLOG
-		this.lastMtime = new ConcurrentHashMap<String, Long>();
-		this.lastRaw = new ConcurrentHashMap<String, JsonElement>();
-		this.lastDefault = Collections.newSetFromMap(new ConcurrentHashMap<String, Boolean>());
-		
 		this.tickTask = new Runnable()
 		{
 			@Override public void run() { Coll.this.onTick(); }
@@ -865,6 +1076,11 @@ public class Coll<E> extends CollAbstract<E>
 	{
 		if (this.inited()) return; // TODO: Would throwing an exception make more sense?
 		
+		if (this.supportsPusher())
+		{
+			//this.getPusher().init();
+		}
+		
 		this.initLoadAllFromRemote();
 		// this.syncAll();
 		
@@ -876,6 +1092,11 @@ public class Coll<E> extends CollAbstract<E>
 	{
 		if ( ! this.inited()) return; // TODO: Would throwing an exception make more sense?
 		
+		if (this.supportsPusher())
+		{
+			//this.getPusher().deinit();
+		}
+		
 		// TODO: Save outwards only? We may want to avoid loads at this stage...
 		this.syncAll();
 		

src/com/massivecraft/massivecore/store/CollAbstract.java

@@ -191,10 +191,40 @@ public abstract class CollAbstract<E> implements CollInterface<E>
 	@Override
 	public Modification examineIdFixed(String id)
 	{
-		// Null check done	 later.
+		if (id == null) throw new NullPointerException("id");
 		return this.examineIdFixed(id, null);
 	}
 	
+	// Examine local
+	@Override
+	public Modification examineIdLocal(Object oid)
+	{
+		if (oid == null) throw new NullPointerException("oid");
+		return this.examineIdLocalFixed(this.fixIdOrThrow(oid));
+	}
+	
+	// Examine remote
+	@Override
+	public Modification examineIdRemote(Object oid)
+	{
+		if (oid == null) throw new NullPointerException("oid");
+		return this.examineIdRemoteFixed(this.fixIdOrThrow(oid));
+	}
+	
+	@Override
+	public Modification examineIdRemote(Object oid, Long remoteMtime)
+	{
+		if (oid == null) throw new NullPointerException("oid");
+		return this.examineIdRemoteFixed(this.fixIdOrThrow(oid), remoteMtime);
+	}
+	
+	@Override
+	public Modification examineIdRemoteFixed(String id)
+	{
+		if (id == null) throw new NullPointerException("id");
+		return this.examineIdRemoteFixed(id, null);
+	}
+	
 	// Sync
 	@Override
 	public Modification syncId(Object oid)
@@ -204,30 +234,31 @@ public abstract class CollAbstract<E> implements CollInterface<E>
 	}
 	
 	@Override
-	public Modification syncId(Object oid, Modification modificationState)
+	public Modification syncId(Object oid, Modification modification)
 	{
 		if (oid == null) throw new NullPointerException("oid");
-		return this.syncIdFixed(this.fixIdOrThrow(oid), modificationState);
+		return this.syncIdFixed(this.fixIdOrThrow(oid), modification);
 	}
 	
 	@Override
-	public Modification syncId(Object oid, Modification modificationState, Entry<JsonElement, Long> remoteEntry)
+	public Modification syncId(Object oid, Modification modification, Entry<JsonElement, Long> remoteEntry)
 	{
 		if (oid == null) throw new NullPointerException("oid");
-		return this.syncIdFixed(this.fixIdOrThrow(oid), modificationState, remoteEntry);
+		return this.syncIdFixed(this.fixIdOrThrow(oid), modification, remoteEntry);
 	}
 
+	// Sync fixed
 	@Override
 	public Modification syncIdFixed(String id)
 	{
-		// Null check done later.
+		if (id == null) throw new NullPointerException("id");
 		return this.syncIdFixed(id, null);
 	}
 	
 	@Override
 	public Modification syncIdFixed(String id, Modification modification)
 	{
-		// Null check done later.
+		if (id == null) throw new NullPointerException("id");
 		return this.syncIdFixed(id, modification, null);
 	}
 	

src/com/massivecraft/massivecore/store/CollInterface.java

@@ -32,6 +32,9 @@ public interface CollInterface<E> extends Named
 	public Db getDb();
 	public Object getCollDriverObject();
 	
+	public boolean supportsPusher();
+	public PusherColl getPusher();
+	
 	// -------------------------------------------- //
 	// STORAGE
 	// -------------------------------------------- //
@@ -90,6 +93,12 @@ public interface CollInterface<E> extends Named
 	public boolean isLowercasing();
 	public void setLowercasing(boolean lowercasing);
 	
+	public int getLocalPollFrequency();
+	public void setLocalPollFrequency(int frequency);
+	
+	public boolean isWarningOnLocalAlter();
+	public void setWarnOnLocalAlter(boolean warnOnLocalAlter);
+	
 	// A default entity will not be saved.
 	// This is often used together with creative collections to save disc space.
 	public boolean isDefault(E entity);
@@ -116,7 +125,7 @@ public interface CollInterface<E> extends Named
 	public String attach(E entity);
 	public String attach(E entity, Object oid);
 	
-	public E detachEntity(Object entity);
+	public E detachEntity(E entity);
 	public E detachId(Object oid);
 	public E detachIdFixed(String id);
 	
@@ -127,7 +136,7 @@ public interface CollInterface<E> extends Named
 	public void postDetach(E entity, String id);
 	
 	// -------------------------------------------- //
-	// IDENTIFIED CHANGES
+	// IDENTIFIED MODIFICATIONS
 	// -------------------------------------------- //
 	
 	/*
@@ -175,24 +184,41 @@ public interface CollInterface<E> extends Named
 	// oid
 	public Modification examineId(Object oid);
 	public Modification examineId(Object oid, Long remoteMtime);
+	public Modification examineIdLocal(Object oid);
+	public Modification examineIdRemote(Object oid);
+	public Modification examineIdRemote(Object oid, Long remoteMtime);
 	
 	// Fixed id
 	public Modification examineIdFixed(String id);
 	public Modification examineIdFixed(String id, Long remoteMtime);
+	public Modification examineIdLocalFixed(String id);
+	public Modification examineIdRemoteFixed(String id);
+	public Modification examineIdRemoteFixed(String id, Long remoteMtime);
 	
-	// oid
+	// Sync
 	public Modification syncId(Object oid);
-	public Modification syncId(Object oid, Modification modificationState);
+	public Modification syncId(Object oid, Modification modification);
-	public Modification syncId(Object oid, Modification modificationState, Entry<JsonElement, Long> remoteEntry);
+	public Modification syncId(Object oid, Modification modification, Entry<JsonElement, Long> remoteEntry);
 	
-	// fixed id
+	// Sync fixed
 	public Modification syncIdFixed(String id);
-	public Modification syncIdFixed(String id, Modification modificationState);
+	public Modification syncIdFixed(String id, Modification modification);
-	public Modification syncIdFixed(String id, Modification modificationState, Entry<JsonElement, Long> remoteEntry);
+	public Modification syncIdFixed(String id, Modification modification, Entry<JsonElement, Long> remoteEntry);
 	
-	public void syncIdentified(boolean safe);
+	public void syncIdentified();
 	public void syncAll();
-	public void identifyModifications();
+	
+	// Identity
+	public void identifyModifications(boolean sure);
+	public void identifyModificationFixed(String id, Long remoteMtime, boolean sure);
+	
+	public void identifyLocalModifications(boolean sure);
+	public void identifyLocalModificationFixed(String id, boolean sure);
+	
+	public void identifyRemoteModifications(boolean sure);
+	public void identifyRemoteModificationFixed(String id, Long remoteMtime, boolean sure);
+	
+	// Init
 	public void initLoadAllFromRemote();
 	
 	// -------------------------------------------- //

src/com/massivecraft/massivecore/store/Db.java

@@ -28,7 +28,7 @@ public interface Db
 	// -------------------------------------------- //
 	
 	public String getDriverName();
-	public Db getDb(String uri);
+	public Db getDb(String uri); // TODO: This seems a bit odd.
 	public boolean dropDb();
 	public Set<String> getCollnames();
 	public boolean renameColl(String from, String to);
@@ -40,5 +40,7 @@ public interface Db
 	public Map<String, Entry<JsonElement, Long>> loadAll(Coll<?> coll);
 	public long save(Coll<?> coll, String id, JsonElement data);
 	public void delete(Coll<?> coll, String id);
+	public boolean supportsPusher();
+	public PusherColl getPusher(Coll<?> coll);
 	
 }

src/com/massivecraft/massivecore/store/DbAbstract.java

@@ -77,4 +77,13 @@ public abstract class DbAbstract implements Db
 	{
 		this.getDriver().delete(coll, id);
 	}
+	
+	public boolean supportsPusher()
+	{
+		return this.getDriver().supportsPusher();
+	}
+	public PusherColl getPusher(Coll<?> coll)
+	{
+		return this.getDriver().getPusher(coll);
+	}
 }

src/com/massivecraft/massivecore/store/Driver.java

@@ -57,4 +57,8 @@ public interface Driver
 	
 	// Delete X
 	public void delete(Coll<?> coll, String id);
+	
+	// Database pusher
+	public boolean supportsPusher();
+	public PusherColl getPusher(Coll<?> coll);
 }

src/com/massivecraft/massivecore/store/DriverFlatfile.java

@@ -1,6 +1,7 @@
 package com.massivecraft.massivecore.store;
 
 import java.io.File;
+import java.io.IOException;
 import java.util.AbstractMap.SimpleEntry;
 import java.util.ArrayList;
 import java.util.Collection;
@@ -9,8 +10,8 @@ import java.util.LinkedHashMap;
 import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
-import java.util.Set;
 import java.util.Map.Entry;
+import java.util.Set;
 
 import com.massivecraft.massivecore.util.DiscUtil;
 import com.massivecraft.massivecore.xlib.gson.JsonElement;
@@ -123,7 +124,7 @@ public class DriverFlatfile extends DriverAbstract
 		
 		// Get Directory
 		File directory = getDirectory(coll);
-		if ( ! directory.isDirectory()) return ret;
+		if ( ! directory.isDirectory()) return ret; // TODO: Throw exception instead?
 		
 		// For each .json file
 		for (File file : directory.listFiles(JsonFileFilter.get()))
@@ -216,6 +217,25 @@ public class DriverFlatfile extends DriverAbstract
 		file.delete();
 	}
 	
+	@Override
+	public boolean supportsPusher()
+	{
+		return true;
+	}
+	
+	@Override
+	public PusherColl getPusher(Coll<?> coll)
+	{
+		try
+		{
+			return new PusherCollFlatfile(coll);
+		}
+		catch (IOException e)
+		{
+			throw new RuntimeException("Failed to create a flatfile system pusher.", e);
+		}
+	}
+	
 	// -------------------------------------------- //
 	// UTIL
 	// -------------------------------------------- //

src/com/massivecraft/massivecore/store/DriverMongo.java

@@ -273,6 +273,19 @@ public class DriverMongo extends DriverAbstract
 		dbcoll.remove(new BasicDBObject(ID_FIELD, id), MassiveCoreMConf.get().getMongoDbWriteConcernDelete());
 	}
 
+	@Override
+	public boolean supportsPusher()
+	{
+		return false;
+	}
+	
+	@Override
+	public PusherColl getPusher(Coll<?> coll)
+	{
+		throw new UnsupportedOperationException("MongoDB does not have a pusher change.");
+	}
+	
+	
 	//----------------------------------------------//
 	// UTIL
 	//----------------------------------------------//

src/com/massivecraft/massivecore/store/Entity.java

@@ -50,7 +50,7 @@ public abstract class Entity<E extends Entity<E>>
 		Coll<E> coll = this.getColl();
 		if (coll == null) return (E)this;
 		
-		return coll.detachEntity(this);
+		return coll.detachEntity((E) this);
 	}
 	
 	public boolean attached()
@@ -105,35 +105,31 @@ public abstract class Entity<E extends Entity<E>>
 	{
 		if ( ! this.isLive()) return;
 		
+		//System.out.println(this.getColl().getName() + ": " +this.getId() + " was modified locally");
+		
 		// UNKNOWN is very unimportant really.
 		// LOCAL_ATTACH is for example much more important and should not be replaced.
-		if ( ! coll.identifiedModifications.containsKey(id))
+		this.getColl().putIdentifiedModificationFixed(this.getId(), Modification.UNKNOWN);
-		{
-			coll.identifiedModifications.put(id, Modification.UNKNOWN);
-		}
 	}
 	
 	public Modification sync()
 	{
-		String id = this.getId();
+		if ( ! this.isLive()) return Modification.UNKNOWN;
-		if (id == null) return Modification.UNKNOWN;
+		return this.getColl().syncIdFixed(id);
-		return this.getColl().syncId(id);
 	}
 	
 	public void saveToRemote()
 	{
-		String id = this.getId();
+		if ( ! this.isLive()) return;
-		if (id == null) return;
 		
-		this.getColl().saveToRemote(id);
+		this.getColl().saveToRemoteFixed(id);
 	}
 	
 	public void loadFromRemote()
 	{
-		String id = this.getId();
+		if ( ! this.isLive()) return;
-		if (id == null) return;
 		
-		this.getColl().loadFromRemote(id, null);
+		this.getColl().loadFromRemoteFixed(id, null);
 	}
 	
 	// -------------------------------------------- //

src/com/massivecraft/massivecore/store/EntityMeta.java

@@ -0,0 +1,32 @@
+package com.massivecraft.massivecore.store;
+
+import com.massivecraft.massivecore.xlib.gson.JsonElement;
+
+//TODO: Merge with entity
+public class EntityMeta
+{
+	// -------------------------------------------- //
+	// CONSTANTS
+	// -------------------------------------------- //
+	
+	public static final JsonElement DEFAULT_LAST_RAW = null;
+	public static final long DEFAULT_MTIME = 0;
+	public static final boolean DEFAULT_DEFAULT = false;
+	
+	// -------------------------------------------- //
+	// FIELDS
+	// -------------------------------------------- //
+
+	private volatile JsonElement lastRaw = DEFAULT_LAST_RAW;
+	public JsonElement getLastRaw() { return this.lastRaw; }
+	public void setLastRaw(JsonElement lastRaw) { this.lastRaw = lastRaw; }
+	
+	private volatile long mtime = DEFAULT_MTIME;
+	public long getMtime() { return this.mtime; }
+	public void setMtime(long mtime) { this.mtime = mtime; }
+	
+	private volatile boolean isDefault = DEFAULT_DEFAULT;
+	public boolean isDefault() { return this.isDefault; }
+	public void setDefault(boolean isDefault) { this.isDefault = isDefault; }
+
+}

src/com/massivecraft/massivecore/store/ExamineThread.java

@@ -1,68 +0,0 @@
-package com.massivecraft.massivecore.store;
-
-public class ExamineThread extends Thread
-{
-	// -------------------------------------------- //
-	// INSTANCE
-	// -------------------------------------------- //
-	
-	private static ExamineThread i = null;
-	public static ExamineThread get()
-	{
-		if (i == null || !i.isAlive()) i = new ExamineThread();
-		return i;
-	}
-	
-	// -------------------------------------------- //
-	// CONSTRUCT
-	// -------------------------------------------- //
-	
-	public ExamineThread()
-	{
-		this.setName("MStore ExamineThread");
-	}
-	
-	// -------------------------------------------- //
-	// FIELDS
-	// -------------------------------------------- //
-	
-	private long lastDurationMillis = 0;
-	public long getLastDurationMillis() { return this.lastDurationMillis; }
-	
-	// -------------------------------------------- //
-	// OVERRIDE
-	// -------------------------------------------- //
-	
-	@Override
-	public void run()
-	{
-		while (true)
-		{
-			try
-			{
-				long before = System.currentTimeMillis();
-				for (Coll<?> coll : Coll.getInstances())
-				{
-					coll.identifyModifications();
-				}
-				long after = System.currentTimeMillis();
-				long duration = after-before;
-				this.lastDurationMillis = duration;
-				
-				//String message = Txt.parse("<i>ExamineThread iteration took <h>%dms<i>.", after-before);
-				//MassiveCore.get().log(message);
-				
-				Thread.sleep(5000);
-			}
-			catch (InterruptedException e)
-			{
-				// We've been interrupted. Lets bail.
-				return;
-			}
-			catch (Exception e)
-			{
-				e.printStackTrace();
-			}
-		}
-	}
-}

src/com/massivecraft/massivecore/store/GsonCloner.java

@@ -11,6 +11,7 @@ import com.massivecraft.massivecore.xlib.gson.JsonPrimitive;
 
 public class GsonCloner
 {
+	// All
 	public static JsonElement clone(JsonElement element)
 	{
 		// null
@@ -20,39 +21,48 @@ public class GsonCloner
 		if (element.isJsonNull()) return JsonNull.INSTANCE;
 		
 		// JsonPrimitive
-		if (element.isJsonPrimitive())
+		if (element.isJsonPrimitive()) return cloneJsonPrimitive(element.getAsJsonPrimitive());
-		{
-			JsonPrimitive primitive = element.getAsJsonPrimitive();
-			if (primitive.isBoolean()) return new JsonPrimitive(primitive.getAsBoolean());
-			if (primitive.isString()) return new JsonPrimitive(primitive.getAsString());
-			if (primitive.isNumber()) return new JsonPrimitive(primitive.getAsNumber());
-			
-			throw new UnsupportedOperationException("The json primitive: " + primitive + " was not a boolean, number or string");
-		}
 		
 		// JsonObject
-		if (element.isJsonObject())
+		if (element.isJsonObject()) return cloneJsonObject(element.getAsJsonObject());
-		{
-			JsonObject ret = new JsonObject();
-			for (Entry<String, JsonElement> entry : ((JsonObject)element).entrySet())
-			{
-				ret.add(entry.getKey(), clone(entry.getValue()));
-			}
-			return ret;
-		}
 		
 		// JsonArray
-		if (element.isJsonArray())
+		if (element.isJsonArray()) return cloneJsonArray(element.getAsJsonArray());
-		{
-			JsonArray ret = new JsonArray();
-			Iterator<JsonElement> iter = ((JsonArray)element).iterator();
-			while (iter.hasNext())
-			{
-				ret.add(clone(iter.next()));
-			}
-			return ret;
-		}
 		
+		// Unknown
 		throw new RuntimeException("Unknown JsonElement class: " + element.getClass().getName());
 	}
+	
+	// Primitive
+	public static JsonPrimitive cloneJsonPrimitive(JsonPrimitive primitive)
+	{
+		if (primitive.isBoolean()) return new JsonPrimitive(primitive.getAsBoolean());
+		if (primitive.isString()) return new JsonPrimitive(primitive.getAsString());
+		if (primitive.isNumber()) return new JsonPrimitive(primitive.getAsNumber());
+		
+		throw new UnsupportedOperationException("The json primitive: " + primitive + " was not a boolean, number or string");
+	}
+	
+	// Object
+	public static JsonObject cloneJsonObject(JsonObject object)
+	{
+		JsonObject ret = new JsonObject();
+		for (Entry<String, JsonElement> entry : object.entrySet())
+		{
+			ret.add(entry.getKey(), clone(entry.getValue()));
+		}
+		return ret;
+	}
+	
+	// Array
+	public static JsonArray cloneJsonArray(JsonArray array)
+	{
+		JsonArray ret = new JsonArray();
+		for (Iterator<JsonElement> iter = array.iterator(); iter.hasNext();)
+		{
+			ret.add(clone(iter.next()));
+		}
+		return ret;
+	}
+	
 }

src/com/massivecraft/massivecore/store/JsonFileFilter.java

@@ -9,7 +9,7 @@ public class JsonFileFilter implements FileFilter
 	// CONSTANTS
 	// -------------------------------------------- //
 	
-	private final static String DOTJSON = ".json";
+	public final static String DOTJSON = ".json";
 	
 	// -------------------------------------------- //
 	// INSTANCE & CONSTRUCT

src/com/massivecraft/massivecore/store/MStore.java

@@ -11,6 +11,12 @@ import com.massivecraft.massivecore.xlib.gson.JsonElement;
 
 public class MStore
 {
+	// -------------------------------------------- //
+	// CONSTANTS
+	// -------------------------------------------- //
+	
+	public static boolean DEBUG_ENABLED = false;
+	
 	// -------------------------------------------- //
 	// DRIVER REGISTRY
 	// -------------------------------------------- //
@@ -103,5 +109,4 @@ public class MStore
 		return driver.getDb(uri.toString());
 	}
 	
-	
 }

src/com/massivecraft/massivecore/store/Modification.java

@@ -2,20 +2,27 @@ package com.massivecraft.massivecore.store;
 
 public enum Modification
 {
+
 	// -------------------------------------------- //
 	// ENUM
 	// -------------------------------------------- //
 	
-	LOCAL_ALTER (true, true),
+	LOCAL_ALTER (true, 3),
-	LOCAL_ATTACH (true, true),
+	LOCAL_ATTACH (true, 7),
-	LOCAL_DETACH (true, true),
+	LOCAL_DETACH (true, 8),
-	REMOTE_ALTER (true, false),
+	REMOTE_ALTER (true, 4),
-	REMOTE_ATTACH (true, false),
+	REMOTE_ATTACH (true, 5),
-	REMOTE_DETACH (true, false),
+	REMOTE_DETACH (true, 6),
-	NONE (false, false),
+	NONE (false, 1),
-	UNKNOWN (false, false),
+	UNKNOWN (false, 2),
 	;
 	
+	// -------------------------------------------- //
+	// CONSTANTS
+	// -------------------------------------------- //
+	
+	public static final int TOP_PRIORITY = 7;
+	
 	// -------------------------------------------- //
 	// FIELDS
 	// -------------------------------------------- //
@@ -23,18 +30,49 @@ public enum Modification
 	private final boolean modified;
 	public boolean isModified() { return this.modified; }
 	
-	private final boolean local;
+	private final int priority;
-	public boolean isLocal() { return this.local; }
+	public int getPriority() { return this.priority; }
-	public boolean isRemote() { return this.local == false; }
 	
 	// -------------------------------------------- //
 	// CONSTRUCT
 	// -------------------------------------------- //
 	
-	private Modification(boolean modified, boolean local)
+	private Modification(boolean modified, int priority)
 	{
 		this.modified = modified;
-		this.local = local;
+		this.priority = priority;
 	}
 	
+	// -------------------------------------------- //
+	// LOCAL VS REMOTE
+	// -------------------------------------------- //
+	
+	public boolean isLocal()
+	{
+		return this == LOCAL_ALTER || this == LOCAL_ATTACH || this == LOCAL_DETACH;
+	}
+	public boolean isRemote()
+	{
+		return this == REMOTE_ALTER || this == REMOTE_ATTACH || this == REMOTE_DETACH;
+	}
+	
+	// -------------------------------------------- //
+	// SAFE
+	// -------------------------------------------- //
+	
+	// If a modification state is safe,
+	// that means that you can always be sure that when it is saved
+	// in identifiedModifications, it ensured to actually be that.
+	public boolean isSafe()
+	{
+		return this == LOCAL_ATTACH || this == LOCAL_DETACH;
+	}
+	
+	// Local Attach and Detach has the top priority.
+	// Otherwise newly attached entities would be removed thinking it was a remote detach.
+	// Otherwise newly detached entities would be loaded thinking it was a remote attach.
+	public boolean hasTopPriority()
+	{
+		return this.getPriority() >= TOP_PRIORITY;
+	}
 }

src/com/massivecraft/massivecore/store/ModificationPollerAbstract.java

@@ -0,0 +1,77 @@
+package com.massivecraft.massivecore.store;
+
+public abstract class ModificationPollerAbstract extends Thread
+{
+	// -------------------------------------------- //
+	// CONSTRUCT
+	// -------------------------------------------- //
+	
+	public ModificationPollerAbstract()
+	{
+		this.setName("MStore " + this.getClass().getSimpleName());
+	}
+	
+	// -------------------------------------------- //
+	// FIELDS
+	// -------------------------------------------- //
+	
+	private long iterationCount = 1;
+	
+	// -------------------------------------------- //
+	// OVERRIDE
+	// -------------------------------------------- //
+	
+	@Override
+	public void run()
+	{
+		while (true)
+		{
+			try
+			{
+				//System.out.println("Polling locally: " + MassiveCoreMConf.get().millisBetweenLocalPoll);
+				this.identify();
+				iterationCount++;
+				
+				//String message = Txt.parse("<i>LocalModificationThread iteration took <h>%dms<i>.", after-before);
+				//MassiveCore.get().log(message);
+				
+				Thread.sleep(this.getMillisBetweenPoll());
+			}
+			catch (InterruptedException e)
+			{
+				// We've been interrupted. Lets bail.
+				return;
+			}
+			catch (Exception e)
+			{
+				System.out.println("Poller error for" + this.getName());
+				e.printStackTrace();
+			}
+		}
+	}
+	
+	// -------------------------------------------- //
+	// CORE
+	// -------------------------------------------- //
+	
+	public void identify() throws InterruptedException
+	{
+		final long waitEfterColl = this.getMillisBetweenPollColl();
+		for (Coll<?> coll : Coll.getInstances())
+		{
+			if (this.poll(coll, this.iterationCount))
+			{
+				Thread.sleep(waitEfterColl);
+			}
+			
+		}
+	}
+	
+	// -------------------------------------------- //
+	// ABSTRACT
+	// -------------------------------------------- //
+	
+	public abstract long getMillisBetweenPoll();
+	public abstract long getMillisBetweenPollColl();
+	public abstract boolean poll(Coll<?> coll, long iterationCount);
+}

src/com/massivecraft/massivecore/store/ModificationPollerLocal.java

@@ -0,0 +1,45 @@
+package com.massivecraft.massivecore.store;
+
+import com.massivecraft.massivecore.MassiveCoreMConf;
+
+public class ModificationPollerLocal extends ModificationPollerAbstract
+{
+	// -------------------------------------------- //
+	// INSTANCE
+	// -------------------------------------------- //
+	
+	private static ModificationPollerLocal i = null;
+	public static ModificationPollerLocal get()
+	{
+		if (i == null || !i.isAlive()) i = new ModificationPollerLocal();
+		return i;
+	}
+	
+	// -------------------------------------------- //
+	// OVERRIDE
+	// -------------------------------------------- //
+	
+	@Override
+	public long getMillisBetweenPoll()
+	{
+		return MassiveCoreMConf.get().millisBetweenLocalPoll;
+	}
+
+	@Override
+	public long getMillisBetweenPollColl()
+	{
+		return MassiveCoreMConf.get().millisBetweenLocalPollColl;
+	}
+
+	@Override
+	public boolean poll(Coll<?> coll, long iterationCount)
+	{
+		if (iterationCount % coll.getLocalPollFrequency() == 0)
+		{
+			coll.identifyLocalModifications(false);
+			return true;
+		}
+		return false;
+	}
+
+}

src/com/massivecraft/massivecore/store/ModificationPollerRemote.java

@@ -0,0 +1,43 @@
+package com.massivecraft.massivecore.store;
+
+import com.massivecraft.massivecore.MassiveCoreMConf;
+
+public class ModificationPollerRemote extends ModificationPollerAbstract
+{
+	// -------------------------------------------- //
+	// INSTANCE
+	// -------------------------------------------- //
+	
+	private static ModificationPollerRemote i = null;
+	public static ModificationPollerRemote get()
+	{
+		if (i == null || !i.isAlive()) i = new ModificationPollerRemote();
+		return i;
+	}
+	
+	
+	// -------------------------------------------- //
+	// OVERRIDE
+	// -------------------------------------------- //
+	
+	@Override
+	public long getMillisBetweenPoll()
+	{
+		return MassiveCoreMConf.get().millisBetweenRemotePoll;
+	}
+
+	@Override
+	public long getMillisBetweenPollColl()
+	{
+		return MassiveCoreMConf.get().millisBetweenRemotePollColl;
+	}
+
+	@Override
+	public boolean poll(Coll<?> coll, long iterationCount)
+	{
+		//TODO: This could probably be true.
+		coll.identifyRemoteModifications(false);
+		return true;
+	}
+
+}

src/com/massivecraft/massivecore/store/PusherColl.java

@@ -0,0 +1,7 @@
+package com.massivecraft.massivecore.store;
+
+public interface PusherColl
+{
+	public void init();
+	public void deinit();
+}

src/com/massivecraft/massivecore/store/PusherCollFlatfile.java

@@ -0,0 +1,227 @@
+package com.massivecraft.massivecore.store;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.FileSystems;
+import java.nio.file.FileVisitResult;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.SimpleFileVisitor;
+import java.nio.file.StandardWatchEventKinds;
+import java.nio.file.WatchEvent;
+import java.nio.file.WatchEvent.Kind;
+import java.nio.file.WatchKey;
+import java.nio.file.WatchService;
+import java.nio.file.attribute.BasicFileAttributes;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+import com.massivecraft.massivecore.MassiveCore;
+
+public class PusherCollFlatfile extends Thread implements PusherColl
+{
+	// -------------------------------------------- //
+	// CONSTANTS
+	// -------------------------------------------- //
+	
+	public static final Kind<?>[] EVENT_TYPES = {StandardWatchEventKinds.ENTRY_CREATE, StandardWatchEventKinds.ENTRY_DELETE, StandardWatchEventKinds.ENTRY_MODIFY};
+	
+	// -------------------------------------------- //
+	// FIELDS
+	// -------------------------------------------- //
+	
+	private final String folderUri;
+	private final WatchService watcher;
+	private final Map<WatchKey, Path> keys;
+	private final Coll<?> coll;
+	private final Set<String> handledIds = new HashSet<String>();
+	
+	// -------------------------------------------- //
+	// OVERRIDE: THREAD
+	// -------------------------------------------- //
+	
+	@SuppressWarnings("unchecked")
+	public void run()
+	{
+		//MassiveCore.get().log("Starting Pusher for " + coll.getBasename());
+		while (true)
+		{
+			try
+			{
+				WatchKey key = this.watcher.take();
+				Path dir = this.keys.get(key);
+				if (dir == null)
+				{
+					//System.err.println("WatchKey not recognized!!");
+					continue;
+				}
+				
+				for (WatchEvent<?> event : key.pollEvents())
+				{
+					handleEvent((WatchEvent<Path>) event, dir);
+				}
+				
+				boolean valid = key.reset();
+				if ( ! valid) this.keys.remove(key);
+			}
+			catch (InterruptedException e)
+			{
+				// We've been interrupted. Lets bail.
+				MassiveCore.get().log("Stopping Pusher for " + this.coll.getDebugName());
+				return;
+			}
+			catch (Exception e)
+			{
+				System.out.println("Pusher error for" + this.coll.getDebugName());
+				e.printStackTrace();
+			}
+			finally
+			{
+				handledIds.clear();
+			}
+		}
+	}
+	
+	public void handleEvent(WatchEvent<Path> event, Path root) throws IOException
+	{
+		// Note on my computer running OSX El Capitan
+		// updates is sent every 10 seconds.
+		// So the information /could/ be a little less than 10 seconds old.
+		// Thus we cannot trust the kind of the modification event.
+		// But only trust that the file has been modified in some way.
+			
+		// Context for directory entry event is the file name of entry
+		Path context = event.context();
+		Path fullPath = root.resolve(context);
+		File file = fullPath.toFile();
+		long mtime = file.lastModified();
+		
+		// Id
+		String id = context.toString();
+		if ( ! isIdOk(id)) return;
+		id = id.substring(0, id.length() - JsonFileFilter.DOTJSON.length());
+		
+		// Most registered modifications here will actually be something done locally.
+		// So most of the time we should just ignore this.
+		Modification mod = this.coll.examineIdFixed(id, mtime);
+		
+		//System.out.println("old: " + coll.getMetaCreative(id).getMtime() + "new: " + mtime);
+		//System.out.println(String.format("Coll %s found %s on %s", this.coll.getBasename(), mod, id));
+		
+		// At LOCAL_ATTACH we get NONE.
+		// At LOCAL_ALTER we get NONE.
+		// At LOCAL_DETACH we get UNKNOWN.
+		// At isDefault we get NONE.
+		// At REMOTE_DETACH we get REMOTE_DETACH.
+		// At REMOTE_ATTACH we get REMOTE_ATTACH (?)
+		// At REMOTE_ALTER we get REMOTE_ALTER.
+		
+		switch(mod)
+		{
+			// It was modified locally.
+			case NONE:
+			case UNKNOWN:
+				return;
+				
+			// It was modified remotely.
+			case REMOTE_ATTACH:
+			case REMOTE_DETACH:
+			case REMOTE_ALTER:
+				// Usually we don't use the results of an async examination
+				// because the entity might be modified locally during the examination.
+				// But now we only care about  remote modifications. Which should be accurate.
+				// However from examination to synchronization there can go a whole tick.
+				// And if a remote detach occurs during that tick, the system would break if we said the modification was alter or attach.
+				// Thus we cannot be sure about the modification, when we get to the synchronization point.
+				coll.putIdentifiedModificationFixed(id, Modification.UNKNOWN);
+				break;
+				
+			// Should not happen
+			case LOCAL_ALTER:
+			case LOCAL_ATTACH:
+			case LOCAL_DETACH:
+				break;
+		}
+	}
+
+	public boolean isIdOk(String id)
+	{
+		// Special files made by the OS and some programs starts with '.'
+		if (id.charAt(0) == '.') return false;
+		
+		// It must be a json file
+		if ( ! id.endsWith(JsonFileFilter.DOTJSON)) return false;
+		
+		// If adding this id DIDN'T have an effect.
+		// It was already there and already handled.
+		if ( ! handledIds.add(id)) return false;
+		
+		return true;
+	}
+	
+	// -------------------------------------------- //
+	// OVERRIDE: PUSHER
+	// -------------------------------------------- //
+
+	@Override
+	public void init()
+	{
+		this.start();
+	}
+
+	@Override
+	public void deinit()
+	{
+		this.interrupt();
+	}
+	
+	// -------------------------------------------- //
+	// REGISTER
+	// -------------------------------------------- //
+	
+	public void register(Path path) throws IOException
+	{
+		if (Files.notExists(path)) throw new IllegalArgumentException(path.toString() + " does not exist.");
+		WatchKey key = path.register(watcher, EVENT_TYPES);
+		//System.out.format("register: %s\n", path);
+		keys.put(key, path);
+	}
+	
+	public void registerAll(final Path start) throws IOException
+	{
+		// register directory and sub-directories
+		Files.walkFileTree(start, new SimpleFileVisitor<Path>() {
+			@Override
+			public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException
+			{
+				register(dir);
+				return FileVisitResult.CONTINUE;
+			}
+		});
+	}
+	
+	// -------------------------------------------- //
+	// CONSTRUCT
+	// -------------------------------------------- //
+	
+	public PusherCollFlatfile(Coll<?> coll) throws IOException
+	{
+		Db db = coll.getDb();
+		if ( ! (db instanceof DbFlatfile)) throw new IllegalArgumentException("Coll doesn't use flatfile database");
+		this.folderUri = db.getDbName() + "/" + coll.getBasename();
+		this.watcher = FileSystems.getDefault().newWatchService();
+		this.keys = new HashMap<WatchKey, Path>();
+		this.coll = coll;
+		
+		// We must make sure that the paths exists,
+		// otherwise we cannot register to listen for changes.
+		// So now we'll have some empty directories.
+		Path path = Paths.get(this.folderUri);
+		path.toFile().mkdirs();
+		this.register(path);
+	}
+
+}