From 3e8fae576d7afccb29f5a35d07df970bafdecd36 Mon Sep 17 00:00:00 2001
From: Keuin <keuinx@gmail.com>
Date: Sat, 17 Sep 2022 15:59:40 +0800
Subject: stashed updates

---
 .../com/keuin/kbackupfabric/KBPluginEvents.java    |  4 +++
 .../autobackup/AutoBackupDispatcher.java           | 29 ++++++++--------------
 .../singleton/MinecraftServerInstance.java         | 25 +++++++++++++++++++
 3 files changed, 40 insertions(+), 18 deletions(-)
 create mode 100644 src/main/java/com/keuin/kbackupfabric/singleton/MinecraftServerInstance.java

(limited to 'src/main/java')

diff --git a/src/main/java/com/keuin/kbackupfabric/KBPluginEvents.java b/src/main/java/com/keuin/kbackupfabric/KBPluginEvents.java
index 2b2865e..e0cb622 100644
--- a/src/main/java/com/keuin/kbackupfabric/KBPluginEvents.java
+++ b/src/main/java/com/keuin/kbackupfabric/KBPluginEvents.java
@@ -7,6 +7,7 @@ import com.keuin.kbackupfabric.metadata.BackupMetadata;
 import com.keuin.kbackupfabric.metadata.MetadataHolder;
 import com.keuin.kbackupfabric.notification.DistinctNotifiable;
 import com.keuin.kbackupfabric.notification.NotificationManager;
+import com.keuin.kbackupfabric.singleton.MinecraftServerInstance;
 import com.keuin.kbackupfabric.ui.KBCommands;
 import com.keuin.kbackupfabric.util.DateUtil;
 import com.keuin.kbackupfabric.util.PrintUtil;
@@ -41,6 +42,9 @@ public final class KBPluginEvents implements ModInitializer, ServerStartCallback
     @Override
     public void onStartServer(MinecraftServer server) {
 
+        // Set singleton holder, so in other place we can use MinecraftServerInstance to get a reference
+        MinecraftServerInstance.setInstance(server);
+
         // Buggy: this does not work
         if (!(server instanceof MinecraftDedicatedServer))
             throw new RuntimeException("KBackup is a server-side-only plugin. Please do not use it in client-side.");
diff --git a/src/main/java/com/keuin/kbackupfabric/autobackup/AutoBackupDispatcher.java b/src/main/java/com/keuin/kbackupfabric/autobackup/AutoBackupDispatcher.java
index 32d626e..d143118 100644
--- a/src/main/java/com/keuin/kbackupfabric/autobackup/AutoBackupDispatcher.java
+++ b/src/main/java/com/keuin/kbackupfabric/autobackup/AutoBackupDispatcher.java
@@ -8,27 +8,28 @@ import java.util.logging.Logger;
 public class AutoBackupDispatcher {
 
     private Timer timer = null;
-    private final Logger logger = Logger.getLogger(AutoBackupDispatcher.class.getName());
+    private final Logger logger = Logger.getLogger("KBackup-AutoBackup");
     private boolean skipIfNoPlayerLoggedIn;
     private final PlayerActivityTracker playerActivityTracker;
 
     public AutoBackupDispatcher(int intervalSeconds, boolean skipIfNoPlayerLoggedIn, PlayerActivityTracker playerActivityTracker) {
+        if (intervalSeconds < 1)
+            throw new IllegalArgumentException("interval is too small");
         this.skipIfNoPlayerLoggedIn = skipIfNoPlayerLoggedIn;
         this.playerActivityTracker = playerActivityTracker;
-        if (intervalSeconds > 0)
-            setInterval(intervalSeconds);
-    }
-
-    public synchronized void setInterval(int intervalSeconds) {
+        // start timer
         Optional.ofNullable(timer).ifPresent(Timer::cancel);
-        Timer newTimer = new Timer("AutoBackupTimer");
-        newTimer.schedule(new TimerTask() {
+        Timer timer = new Timer("AutoBackupTimer");
+        timer.schedule(new TimerTask() {
             @Override
             public void run() {
-                toggleBackup();
+                if (playerActivityTracker.getCheckpoint() || !skipIfNoPlayerLoggedIn) {
+                    logger.info("Making regular backup...");
+                    // TODO: perform a backup
+                }
             }
         }, 0L, intervalSeconds * 1000L);
-        timer = newTimer;
+        this.timer = timer;
     }
 
     public void setSkipIfNoPlayerLoggedIn(boolean skipIfNoPlayerLoggedIn) {
@@ -39,12 +40,4 @@ public class AutoBackupDispatcher {
         timer.cancel();
         timer = null;
     }
-
-    private void toggleBackup() {
-        if (playerActivityTracker.getCheckpoint() || !skipIfNoPlayerLoggedIn) {
-            logger.info("Interval backup event is triggered.");
-            // TODO: perform a backup
-        }
-    }
-
 }
diff --git a/src/main/java/com/keuin/kbackupfabric/singleton/MinecraftServerInstance.java b/src/main/java/com/keuin/kbackupfabric/singleton/MinecraftServerInstance.java
new file mode 100644
index 0000000..dc1ff52
--- /dev/null
+++ b/src/main/java/com/keuin/kbackupfabric/singleton/MinecraftServerInstance.java
@@ -0,0 +1,25 @@
+package com.keuin.kbackupfabric.singleton;
+
+import net.minecraft.server.MinecraftServer;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Objects;
+import java.util.concurrent.atomic.AtomicReference;
+
+/**
+ * Holds {@link MinecraftServer} instance.
+ */
+public class MinecraftServerInstance {
+    private static AtomicReference<MinecraftServer> instance = new AtomicReference<>();
+
+    public static @NotNull MinecraftServer getInstance() {
+        return Objects.requireNonNull(instance.get());
+    }
+
+    public static void setInstance(@NotNull MinecraftServer instance) {
+        Objects.requireNonNull(instance);
+        if (!MinecraftServerInstance.instance.compareAndSet(null, instance)) {
+            throw new IllegalStateException("instance already exists");
+        }
+    }
+}
-- 
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