Add next-wave-delay per-arena setting.

This commit adds a new per-arena config-file setting, next-wave-delay. When a new wave is about to spawn, a positive next-wave-delay value will cause the spawning of the wave to be delayed by that amount of seconds, similar to how first-wave-delay delays the spawning of the first wave.

By moving all of the actual spawning logic into a new method and simply referencing that as a Runnable, we can avoid having to set weird boolean flags and re-scheduling the MASpawnThread itself.

Closes #449

src/main/java/com/garbagemule/MobArena/MASpawnThread.java

@@ -38,6 +38,7 @@ public class MASpawnThread implements Runnable
     private int playerCount, monsterLimit;
     private boolean waveClear, bossClear, preBossClear, wavesAsLevel;
     private int waveInterval;
+    private int nextWaveDelay;
 
     /**
      * Create a new monster spawner for the input arena.
@@ -70,6 +71,7 @@ public class MASpawnThread implements Runnable
         preBossClear = arena.getSettings().getBoolean("clear-wave-before-boss", false);
         wavesAsLevel = arena.getSettings().getBoolean("display-waves-as-level", false);
         waveInterval = arena.getSettings().getInt("wave-interval", 3);
+        nextWaveDelay = arena.getSettings().getInt("next-wave-delay", 0);
     }
 
     public void run() {
@@ -104,6 +106,18 @@ public class MASpawnThread implements Runnable
             return;
         }
 
+        // Delay the next wave
+        if (nextWaveDelay > 0) {
+            arena.scheduleTask(this::spawnNextWave, nextWaveDelay * 20);
+        } else {
+            spawnNextWave();
+        }
+    }
+
+    private void spawnNextWave() {
+        // Grab the wave number.
+        int nextWave = waveManager.getWaveNumber() + 1;
+
         // Grant rewards (if any) for the wave that just ended
         grantRewards(nextWave - 1);
 

src/main/resources/res/settings.yml

@@ -21,6 +21,7 @@ min-players: 0
 max-players: 0
 max-join-distance: 0
 first-wave-delay: 5
+next-wave-delay: 0
 wave-interval: 15
 final-wave: 0
 monster-limit: 100