fix: high latency redis environments firing data updates twice

common/src/main/java/net/william278/husksync/sync/DataSyncer.java

@@ -27,6 +27,7 @@
 import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 
+import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicLong;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.function.Function;
@@ -107,11 +108,18 @@ protected void setUserFromDatabase(@NotNull OnlineUser user) {
     protected void listenForRedisData(@NotNull OnlineUser user, @NotNull Supplier<Boolean> completionSupplier) {
         final AtomicLong timesRun = new AtomicLong(0L);
         final AtomicReference<Task.Repeating> task = new AtomicReference<>();
+        final AtomicBoolean processing = new AtomicBoolean(false);
         final Runnable runnable = () -> {
             if (user.isOffline()) {
                 task.get().cancel();
                 return;
             }
+            // Ensure only one task is running at a time
+            if (processing.getAndSet(true)) {
+                return;
+            }
+
+            // Timeout if the plugin is disabling or the max attempts have been reached
             if (plugin.isDisabling() || timesRun.getAndIncrement() > maxListenAttempts) {
                 task.get().cancel();
                 plugin.debug(String.format("[%s] Redis timed out after %s attempts; setting from database",
@@ -120,9 +128,11 @@ protected void listenForRedisData(@NotNull OnlineUser user, @NotNull Supplier<Bo
                 return;
             }
 
+            // Fire the completion supplier
             if (completionSupplier.get()) {
                 task.get().cancel();
             }
+            processing.set(false);
         };
         task.set(plugin.getRepeatingTask(runnable, LISTEN_DELAY));
         task.get().run();

gradle.properties

@@ -3,7 +3,7 @@ org.gradle.jvmargs='-Dfile.encoding=UTF-8'
 org.gradle.daemon=true
 javaVersion=16
 
-plugin_version=3.2.1
+plugin_version=3.2.2
 plugin_archive=husksync
 plugin_description=A modern, cross-server player data synchronization system