Performance and stability improvements

- improved performance of paper generation task
- improved stability of spigot generation task
- Updated Readme
- added configuration parameters for max pending chunks and max loaded chunks

README.md

@@ -22,11 +22,24 @@ All features can be accessed with the command `/chunkmaster` or the aliases `/ch
 ```yaml
 generation:
 
+  # The maximum amount of chunks that are loaded before unloading and saving them.
+  # Higher values mean higher generation speed but greater memory usage.
+  # The value should be a positive integer.
+  max-loaded-chunks: 10
+
+  # Paper Only
+  # The maximum amount of requested chunks with the asynchronous paper chunk
+  # loading method. Higher values mean faster generation but more memory usage
+  # (and probably bigger performance impact).
+  # The value should be a positive integer.
+  max-pending-chunks: 10
+
   # The period (in ticks) in which a generation step is run.
   # Higher values mean less performance impact but slower generation.
   # The value should be a positive integer.
   period: 2
 
+  # Paper Only
   # The number of already generated chunks that will be skipped for each step.
   # Notice that these still have a performance impact because the server needs to check
   # if the chunk is generated.
@@ -47,4 +60,10 @@ generation:
   # process is minimal.
   # The value should be a boolean <true/false>
   pause-on-join: true
-```
+```
+
+## Spigot and Paper
+
+The plugin works on spigot and paper servers but is significantly faster on paper servers
+(because it profits from asynchronous chunk loading an the better implementation of the
+isChunkGenerated method).

src/main/kotlin/net/trivernis/chunkmaster/Chunkmaster.kt

@@ -56,9 +56,11 @@ class Chunkmaster: JavaPlugin() {
     private fun configure() {
         dataFolder.mkdir()
         config.addDefault("generation.period", 2L)
-        config.addDefault("generation.chunks-skips-per-step", 4)
+        config.addDefault("generation.chunks-skips-per-step", 10)
         config.addDefault("generation.mspt-pause-threshold", 500L)
         config.addDefault("generation.pause-on-join", true)
+        config.addDefault("generation.max-pending-chunks", 10)
+        config.addDefault("generation.max-loaded-chunks", 10)
         config.options().copyDefaults(true)
         saveConfig()
     }

src/main/kotlin/net/trivernis/chunkmaster/lib/generation/ChunkCoordinates.kt

@@ -1,4 +1,10 @@
 package net.trivernis.chunkmaster.lib.generation
 
-data class ChunkCoordinates(val x: Int, val z: Int) {
+import org.bukkit.Location
+import org.bukkit.World
+
+class ChunkCoordinates(val x: Int, val z: Int) {
+    fun getCenterLocation(world: World): Location {
+        return Location(world, ((x*16) + 8).toDouble(), 1.0, ((x*16) + 8).toDouble())
+    }
 }

src/main/kotlin/net/trivernis/chunkmaster/lib/generation/GenerationTask.kt

@@ -13,14 +13,15 @@ abstract class GenerationTask(plugin: Chunkmaster, centerChunk: Chunk, startChun
     abstract val stopAfter: Int
     abstract val world: World
     abstract val count: Int
-    abstract val lastChunk: Chunk
     abstract val endReached: Boolean
 
     protected val spiral: Spiral =
         Spiral(Pair(centerChunk.x, centerChunk.z), Pair(startChunk.x, startChunk.z))
     protected val loadedChunks: HashSet<Chunk> = HashSet()
+    protected var lastChunkCoords = ChunkCoordinates(startChunk.x, startChunk.z)
     protected val chunkSkips = plugin.config.getInt("generation.chunks-skips-per-step")
     protected val msptThreshold = plugin.config.getLong("generation.mspt-pause-threshold")
+    protected val maxLoadedChunks = plugin.config.getInt("generation.max-loaded-chunks")
 
     abstract override fun run()
     abstract fun cancel()
@@ -30,13 +31,21 @@ abstract class GenerationTask(plugin: Chunkmaster, centerChunk: Chunk, startChun
             val nextChunkCoords = spiral.next()
             return ChunkCoordinates(nextChunkCoords.first, nextChunkCoords.second)
         }
+    var lastChunk: Chunk = startChunk
+        get() {
+            return world.getChunkAt(lastChunkCoords.x, lastChunkCoords.z)
+        }
+        private set
     val nextChunk: Chunk
         get() {
             val next = nextChunkCoordinates
             return world.getChunkAt(next.x, next.z)
         }
 
+    /**
+     * Checks if the World border or the maximum chunk setting for the task is reached.
+     */
     protected fun borderReached(): Boolean {
-        return !world.worldBorder.isInside(lastChunk.getBlock(8, 0, 8).location) || (stopAfter in 1..count)
+        return !world.worldBorder.isInside(lastChunkCoords.getCenterLocation(world)) || (stopAfter in 1..count)
     }
 }

src/main/kotlin/net/trivernis/chunkmaster/lib/generation/GenerationTaskPaper.kt

@@ -12,20 +12,15 @@ class GenerationTaskPaper(
     override val stopAfter: Int = -1
 ) : GenerationTask(plugin, centerChunk, startChunk) {
 
+    private val maxPendingChunks = plugin.config.getInt("generation.max-pending-chunks")
+
     private val pendingChunks = HashSet<CompletableFuture<Chunk>>()
 
     override var count = 0
         private set
-    override var lastChunk: Chunk = startChunk
-        get() {
-            return world.getChunkAt(lastChunkCoords.x, lastChunkCoords.z)
-        }
-        private set
     override var endReached: Boolean = false
         private set
 
-    private var lastChunkCoords = ChunkCoordinates(startChunk.x, startChunk.z)
-
     /**
      * Runs the generation task. Every Iteration the next chunk will be generated if
      * it hasn't been generated already.
@@ -33,13 +28,14 @@ class GenerationTaskPaper(
      */
     override fun run() {
         if (plugin.mspt < msptThreshold) {    // pause when tps < 2
-            if (loadedChunks.size > 10) {
+            if (loadedChunks.size > maxLoadedChunks) {
                 for (chunk in loadedChunks) {
                     if (chunk.isLoaded) {
                         chunk.unload(true)
                     }
                 }
-            } else if (pendingChunks.size < 10) {   // if more than 10 chunks are pending, wait.
+                loadedChunks.clear()
+            } else if (pendingChunks.size < maxPendingChunks) {   // if more than 10 chunks are pending, wait.
                 if (borderReached()) {
                     endReached = true
                     return

src/main/kotlin/net/trivernis/chunkmaster/lib/generation/GenerationTaskSpigot.kt

@@ -13,8 +13,6 @@ class GenerationTaskSpigot(
 
     override var count = 0
         private set
-    override var lastChunk: Chunk = startChunk
-        private set
     override var endReached: Boolean = false
         private set
 
@@ -25,33 +23,27 @@ class GenerationTaskSpigot(
      */
     override fun run() {
         if (plugin.mspt < msptThreshold) {    // pause when tps < 2
-            if (loadedChunks.size > 10) {
+            if (loadedChunks.size > maxLoadedChunks) {
                 for (chunk in loadedChunks) {
                     if (chunk.isLoaded) {
                         chunk.unload(true)
                     }
                 }
+                loadedChunks.clear()
             } else {
                 if (borderReached()) {
                     endReached = true
                     return
                 }
 
-                var chunk = nextChunk
-
-                for (i in 1 until chunkSkips) {
-                    if (world.isChunkGenerated(chunk.x, chunk.z)) {
-                        chunk = nextChunk
-                    } else {
-                        break
-                    }
-                }
+                val chunk = nextChunkCoordinates
 
                 if (!world.isChunkGenerated(chunk.x, chunk.z)) {
-                    chunk.load(true)
-                    loadedChunks.add(chunk)
+                    val chunkInstance = world.getChunkAt(chunk.x, chunk.z)
+                    chunkInstance.load(true)
+                    loadedChunks.add(chunkInstance)
                 }
-                lastChunk = chunk
+                lastChunkCoords = chunk
                 count = spiral.count // set the count to the more accurate spiral count
             }
         }