Fix deadlocks caused by waiting for async operations to complete before the scheduler has started

bukkit/src/main/java/me/lucko/luckperms/bukkit/LPBukkitPlugin.java

@@ -183,11 +183,7 @@ public class LPBukkitPlugin extends JavaPlugin implements LuckPermsPlugin {
 
         // Run update task to refresh any online users
         getLog().info("Scheduling Update Task to refresh any online users.");
-        try {
-            new UpdateTask(this).run();
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
+        updateTaskBuffer.request();
 
         registerPermissions(getConfiguration().isCommandsAllowOp() ? PermissionDefault.OP : PermissionDefault.FALSE);
         if (!getConfiguration().isOpsEnabled()) {

bungee/src/main/java/me/lucko/luckperms/bungee/LPBungeePlugin.java

@@ -148,11 +148,7 @@ public class LPBungeePlugin extends Plugin implements LuckPermsPlugin {
 
         // Run update task to refresh any online users
         getLog().info("Scheduling Update Task to refresh any online users.");
-        try {
-            new UpdateTask(this).run();
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
+        updateTaskBuffer.request();
 
         getLog().info("Successfully loaded.");
     }

common/src/main/java/me/lucko/luckperms/common/storage/AbstractDatastore.java

@@ -83,11 +83,8 @@ public class AbstractDatastore implements Datastore {
     }
 
     @Override
-    public LPFuture<Void> init() {
-        return makeFuture(() -> {
-            backing.init();
-            return null;
-        });
+    public void init() {
+        backing.init();
     }
 
     @Override

common/src/main/java/me/lucko/luckperms/common/storage/Datastore.java

@@ -56,7 +56,7 @@ public interface Datastore {
         return this;
     }
 
-    LPFuture<Void> init();
+    void init();
     LPFuture<Void> shutdown();
     LPFuture<Boolean> logAction(LogEntry entry);
     LPFuture<Log> getLog();

common/src/main/java/me/lucko/luckperms/common/storage/SplitBacking.java

@@ -69,22 +69,16 @@ public class SplitBacking implements Datastore {
     }
 
     @Override
-    public LPFuture<Void> init() {
-        AbstractFuture<Void> future = new AbstractFuture<>();
-        doAsync(() -> {
-            boolean success = true;
-            backing.values().forEach(Datastore::init);
-            for (Datastore ds : backing.values()) {
-                if (!ds.isAcceptingLogins()) {
-                    success = false;
-                }
+    public void init() {
+        boolean success = true;
+        backing.values().forEach(Datastore::init);
+        for (Datastore ds : backing.values()) {
+            if (!ds.isAcceptingLogins()) {
+                success = false;
             }
+        }
 
-            setAcceptingLogins(success);
-            future.complete(null);
-        });
-        return future;
-
+        setAcceptingLogins(success);
     }
 
     @Override

common/src/main/java/me/lucko/luckperms/common/storage/StorageFactory.java

@@ -77,7 +77,7 @@ public class StorageFactory {
         }
 
         plugin.getLog().info("Initialising datastore...");
-        datastore.init().getOrDefault(null);
+        datastore.init();
         return datastore;
     }
     

common/src/main/java/me/lucko/luckperms/common/storage/TolerantDatastore.java

@@ -75,13 +75,8 @@ public class TolerantDatastore implements Datastore {
     }
 
     @Override
-    public LPFuture<Void> init() {
-        phaser.register();
-        try {
-            return backing.init();
-        } finally {
-            phaser.arriveAndDeregister();
-        }
+    public void init() {
+        backing.init();
     }
 
     @Override