no allocations on read/write block chunks

docs/src/progress/renderertodo.md

@@ -1996,6 +1996,7 @@ Performance improvements
  - Block chunk disk map writes files without allocating a buffer
  - Increase memory limit 6GB->8GB
  - Server block chunk disk map writes directly to output stream instead of inbetween buffer
+ - No-allocation block chunk read/write in disk map
 Increase human move speed
 LOD components re-attach physics
 VectorPool->JomlPool

src/main/java/electrosphere/server/physics/block/diskmap/ServerBlockChunkDiskMap.java

@@ -1,16 +1,19 @@
 package electrosphere.server.physics.block.diskmap;
 
-import java.io.ByteArrayOutputStream;
-import java.io.DataOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import java.io.OutputStream;
 import java.nio.ByteBuffer;
 import java.nio.ShortBuffer;
+import java.nio.channels.Channels;
+import java.nio.channels.ReadableByteChannel;
+import java.nio.channels.WritableByteChannel;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.locks.ReentrantLock;
-import java.util.zip.DeflaterOutputStream;
-import java.util.zip.InflaterOutputStream;
+import java.util.zip.DataFormatException;
+import java.util.zip.Deflater;
+import java.util.zip.Inflater;
 
 import electrosphere.client.block.BlockChunkData;
 import electrosphere.engine.Globals;
@@ -50,22 +53,64 @@ public class ServerBlockChunkDiskMap {
      */
     static final int HEADER_HOMOGENOUS = 1;
 
+    /**
+     * Total size of the file potentially
+     */
+    static final int FILE_MAX_SIZE = FILE_HEADER + BlockChunkData.TOTAL_DATA_WIDTH * (2 * 2);
+
     /**
      * The map of world position+chunk type to the file that actually houses that information
      */
-    Map<Long,String> worldPosFileMap;
+    private Map<Long,String> worldPosFileMap;
 
     /**
      * Locks the chunk disk map for thread safety
      */
     @Exclude
-    ReentrantLock lock = new ReentrantLock();
+    private ReentrantLock lock = new ReentrantLock();
+
+    /**
+     * The buffer used for writing out files
+     */
+    @Exclude
+    private ByteBuffer outputBuffer;
+
+    /**
+     * Buffer for compression input
+     */
+    @Exclude
+    private ByteBuffer compressInputBuffer;
+
+    /**
+     * The buffer used for reading in files
+     */
+    @Exclude
+    private ByteBuffer inputBuffer;
+
+    /**
+     * Deflater used for compressing outgoing files
+     */
+    @Exclude
+    private Deflater deflater;
+
+    /**
+     * Inflater used for decompressing incoming files
+     */
+    @Exclude
+    private Inflater inflater;
 
     /**
      * Constructor
      */
     private ServerBlockChunkDiskMap(){
         worldPosFileMap = new HashMap<Long,String>();
+        outputBuffer = ByteBuffer.allocate(FILE_MAX_SIZE);
+        compressInputBuffer = ByteBuffer.allocate(FILE_MAX_SIZE);
+        inputBuffer = ByteBuffer.allocate(FILE_MAX_SIZE);
+        deflater = new Deflater();
+        deflater.setInput(compressInputBuffer);
+        inflater = new Inflater();
+        inflater.setInput(compressInputBuffer);
     }
 
     /**
@@ -139,30 +184,42 @@ public class ServerBlockChunkDiskMap {
         if(this.containsBlocksAtPosition(worldX, worldY, worldZ)){
             //read file
             String fileName = worldPosFileMap.get(getBlockChunkKey(worldX, worldY, worldZ));
-            byte[] rawDataCompressed = FileUtils.loadBinaryFromSavePath(Globals.serverState.currentSave.getName(), fileName);
-            //decompress
-            byte[] rawData = null;
-            ByteArrayOutputStream out = new ByteArrayOutputStream();
-            InflaterOutputStream inflaterInputStream = new InflaterOutputStream(out);
+
+
             try {
-                inflaterInputStream.write(rawDataCompressed);
-                inflaterInputStream.flush();
-                inflaterInputStream.close();
-                rawData = out.toByteArray();
-            } catch (IOException e) {
-                LoggerInterface.loggerFileIO.ERROR(e);
-            }
-            //parse
-            if(rawData != null){
-                ByteBuffer buffer = ByteBuffer.wrap(rawData);
+                //Construct the channel
+                InputStream inputStream = FileUtils.getSavePathAsInputStream(Globals.serverState.currentSave.getName(), fileName);
+                ReadableByteChannel channel = Channels.newChannel(inputStream);
+
+                //setup compression input buffer
+                compressInputBuffer.position(0);
+                compressInputBuffer.limit(FILE_MAX_SIZE);
+
+                //Read the file into the channel
+                channel.read(compressInputBuffer);
+                compressInputBuffer.flip();
+
+                //setup the inflater
+                inflater.setInput(compressInputBuffer);
+                
+                //decompress
+                inflater.inflate(inputBuffer);
+                inputBuffer.flip();
+
+                //error check
+                if(!inflater.finished()){
+                    throw new Error("Failed to read!");
+                }
+
+                //parse
                 rVal = new BlockChunkData();
 
 
-                int headerHomogenousType = buffer.getInt();
+                int headerHomogenousType = inputBuffer.getInt();
                 if(headerHomogenousType == HEADER_NON_HOMOGENOUS){
 
                     //read a non-homogenous chunk
-                    ShortBuffer shortView = buffer.asShortBuffer();
+                    ShortBuffer shortView = inputBuffer.asShortBuffer();
                     short[] type = BlockChunkPool.getShort();
                     short[] metadata = BlockChunkPool.getShort();
                     short firstType = -1;
@@ -186,7 +243,7 @@ public class ServerBlockChunkDiskMap {
                 } else {
 
                     //read a homogenous chunk
-                    short homogenousValue = buffer.getShort();
+                    short homogenousValue = inputBuffer.getShort();
                     rVal.setHomogenousValue(homogenousValue);
                 }
 
@@ -195,6 +252,32 @@ public class ServerBlockChunkDiskMap {
                 rVal.setWorldY(worldY);
                 rVal.setWorldZ(worldZ);
                 rVal.setLod(BlockChunkData.LOD_FULL_RES);
+
+
+                //close channel
+                channel.close();
+                inputStream.close();
+
+                //reset buffers
+                inflater.reset();
+                compressInputBuffer.position(0);
+                compressInputBuffer.limit(FILE_MAX_SIZE);
+                inputBuffer.position(0);
+                inputBuffer.limit(FILE_MAX_SIZE);
+            } catch (IOException ex){
+                inflater.reset();
+                compressInputBuffer.position(0);
+                compressInputBuffer.limit(FILE_MAX_SIZE);
+                inputBuffer.position(0);
+                inputBuffer.limit(FILE_MAX_SIZE);
+                LoggerInterface.loggerFileIO.ERROR(ex);
+            } catch (DataFormatException e) {
+                inflater.reset();
+                compressInputBuffer.position(0);
+                compressInputBuffer.limit(FILE_MAX_SIZE);
+                inputBuffer.position(0);
+                inputBuffer.limit(FILE_MAX_SIZE);
+                LoggerInterface.loggerFileIO.ERROR(e);
             }
         }
         lock.unlock();
@@ -218,39 +301,65 @@ public class ServerBlockChunkDiskMap {
         }
         //compress
         try {
-            OutputStream out = FileUtils.getBinarySavePathOutputStream(Globals.serverState.currentSave.getName(), fileName);
-            DeflaterOutputStream deflaterOutStream = new DeflaterOutputStream(out);
-            DataOutputStream dataOut = new DataOutputStream(deflaterOutStream);
-
             //generate binary for the file
             short[] type = chunkData.getType();
             short[] metadata = chunkData.getMetadata();
 
             //push data
+            compressInputBuffer.position(0);
             if(chunkData.getHomogenousValue() == BlockChunkData.NOT_HOMOGENOUS){
                 //put header
-                dataOut.writeInt(HEADER_NON_HOMOGENOUS);
+                compressInputBuffer.putInt(HEADER_NON_HOMOGENOUS);
                 //put data
                 for(int i = 0; i < BlockChunkData.TOTAL_DATA_WIDTH; i++){
-                    dataOut.writeShort(type[i]);
+                    compressInputBuffer.putShort(type[i]);
                 }
                 for(int i = 0; i < BlockChunkData.TOTAL_DATA_WIDTH; i++){
-                    dataOut.writeShort(metadata[i]);
+                    compressInputBuffer.putShort(metadata[i]);
                 }
             } else {
                 //put header
-                dataOut.writeInt(HEADER_HOMOGENOUS);
+                compressInputBuffer.putInt(HEADER_HOMOGENOUS);
                 //put data
-                dataOut.writeShort(chunkData.getHomogenousValue());
+                compressInputBuffer.putShort(chunkData.getHomogenousValue());
+            }
+            compressInputBuffer.flip();
+
+            //setup deflater
+            deflater.setInput(compressInputBuffer);
+            deflater.finish();
+
+            //construct channel
+            OutputStream out = FileUtils.getBinarySavePathOutputStream(Globals.serverState.currentSave.getName(), fileName);
+            WritableByteChannel channel = Channels.newChannel(out);
+
+            //write
+            while(!deflater.finished()){
+                deflater.deflate(outputBuffer);
+                outputBuffer.flip();
+                channel.write(outputBuffer);
             }
 
             //flush and close
-            dataOut.flush();
-            dataOut.close();
+            channel.close();
+            out.flush();
+            out.close();
+
+            //reset buffers
+            deflater.reset();
+            compressInputBuffer.position(0);
+            compressInputBuffer.limit(FILE_MAX_SIZE);
+            outputBuffer.position(0);
+            outputBuffer.limit(FILE_MAX_SIZE);
 
             //save to the map of filenames
             worldPosFileMap.put(chunkKey,fileName);
         } catch (IOException e) {
+            deflater.reset();
+            compressInputBuffer.position(0);
+            compressInputBuffer.limit(FILE_MAX_SIZE);
+            outputBuffer.position(0);
+            outputBuffer.limit(FILE_MAX_SIZE);
             LoggerInterface.loggerFileIO.ERROR(e);
         }
         lock.unlock();

src/main/java/electrosphere/util/FileUtils.java

@@ -385,6 +385,17 @@ public class FileUtils {
         return rVal;
     }
 
+    /**
+     * Gets a save files as an input stream
+     * @param saveName The save name
+     * @param pathName The path within the save folder
+     * @return The input stream
+     */
+    public static InputStream getSavePathAsInputStream(String saveName, String pathName) throws IOException {
+        String sanitizedFilePath = FileUtils.sanitizeFilePath(pathName);
+        return Files.newInputStream(FileUtils.getSaveFile(saveName,sanitizedFilePath).toPath());
+    }
+
     /**
      * Writes a binary file to a save folder's file
      * @param saveName The name of the save