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+
+/*
+ * Copyright 2011 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ * 
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ * 
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+
+/*
+ * Created on Sunday, February 13 2011 15:17
+ */
+package com.jogamp.common.nio;
+
+import java.nio.ByteBuffer;
+import java.nio.CharBuffer;
+import java.nio.DoubleBuffer;
+import java.nio.FloatBuffer;
+import java.nio.IntBuffer;
+import java.nio.LongBuffer;
+import java.nio.ShortBuffer;
+
+/**
+ * Buffer factory attempting to reduce buffer creation overhead.
+ * Direct ByteBuffers must be page aligned which increases creation overhead of
+ * small buffers significantly.
+ * This factory can be used as fixed size static or or dynamic allocating
+ * factory. The initial size and allocation size is configurable.
+ * <p>
+ * Fixed size factories may be used in systems with hard realtime requirements
+ * and/or predictable memory usage.
+ * </p>
+ * <p>
+ * concurrency info:<br/>
+ * <ul>
+ * <li>all create methods are threadsafe</li>
+ * <li>factories created with create(...) are <b>not</b> threadsafe</li>
+ * <li>factories created with createSynchronized(...) are threadsafe</li>
+ * </ul>
+ * </p>
+ * 
+ * @author Michael Bien
+ */
+public class CachedBufferFactory {
+
+    /**
+     * default size for internal buffer allocation.
+     */
+    public static final int DEFAULT_ALLOCATION_SIZE = 1024 * 1024;
+    
+    private final int ALLOCATION_SIZE;
+    private ByteBuffer currentBuffer;
+    
+    private CachedBufferFactory() {
+        this(DEFAULT_ALLOCATION_SIZE, DEFAULT_ALLOCATION_SIZE);
+    }
+    
+    private CachedBufferFactory(int initialSize, int allocationSize) {
+        currentBuffer = Buffers.newDirectByteBuffer(initialSize);
+        ALLOCATION_SIZE = allocationSize;
+    }
+    
+    
+    /**
+     * Creates a factory with initial size and allocation size set to
+     * {@link #DEFAULT_ALLOCATION_SIZE}.
+     */
+    public static CachedBufferFactory create() {
+        return new CachedBufferFactory();
+    }
+    
+    /**
+     * Creates a factory with the specified initial size. The allocation size is set to
+     * {@link #DEFAULT_ALLOCATION_SIZE}.
+     */
+    public static CachedBufferFactory create(int initialSize) {
+        return new CachedBufferFactory(initialSize, DEFAULT_ALLOCATION_SIZE);
+    }
+    
+    /**
+     * Creates a factory with the specified initial size. The allocation size is set to
+     * {@link #DEFAULT_ALLOCATION_SIZE}.
+     * @param fixed Creates a fixed size factory which will handle overflows (initial size)
+     * with RuntimeExceptions.
+     */
+    public static CachedBufferFactory create(int initialSize, boolean fixed) {
+        return new CachedBufferFactory(initialSize, fixed?-1:DEFAULT_ALLOCATION_SIZE);
+    }
+    
+    /**
+     * Creates a factory with the specified initial size and allocation size.
+     */
+    public static CachedBufferFactory create(int initialSize, int allocationSize) {
+        return new CachedBufferFactory(initialSize, allocationSize);
+    }
+    
+    
+    /**
+     * Synchronized version of {@link #create()}.
+     */
+    public static CachedBufferFactory createSynchronized() {
+        return new SynchronizedCachedBufferFactory();
+    }
+    
+    /**
+     * Synchronized version of {@link #create(int)}.
+     */
+    public static CachedBufferFactory createSynchronized(int initialSize) {
+        return new SynchronizedCachedBufferFactory(initialSize, DEFAULT_ALLOCATION_SIZE);
+    }
+    
+    /**
+     * Synchronized version of {@link #create(int, boolean)}.
+     */
+    public static CachedBufferFactory createSynchronized(int initialSize, boolean fixed) {
+        return new SynchronizedCachedBufferFactory(initialSize, fixed?-1:DEFAULT_ALLOCATION_SIZE);
+    }
+    
+    /**
+     * Synchronized version of {@link #create(int, int)}.
+     */
+    public static CachedBufferFactory createSynchronized(int initialSize, int allocationSize) {
+        return new CachedBufferFactory(initialSize, allocationSize);
+    }
+    
+    /**
+     * Returns true only if this factory does not allow to allocate more buffers
+     * as limited by the initial size.
+     */
+    public boolean isFixed() {
+        return ALLOCATION_SIZE == -1;
+    }
+    
+    /**
+     * Returns the allocation size used to create new internal buffers.
+     * This represents the initial size if {@link #isFixed()} == true.
+     */
+    public int getAllocationSize() {
+        return ALLOCATION_SIZE;
+    }
+    
+    private void checkIfFixed() {
+        if(ALLOCATION_SIZE == -1) {
+            throw new RuntimeException("fixed size buffer factory ran out ouf bounds.");
+        }
+    }
+
+    public ByteBuffer newDirectByteBuffer(int size) {
+        
+        // if large enough... just create it
+        if (size >= currentBuffer.capacity()) {
+            checkIfFixed();
+            return Buffers.newDirectByteBuffer(size);
+        }
+
+        // create new internal buffer if the old is running full
+        if (size > currentBuffer.remaining()) {
+            checkIfFixed();
+            currentBuffer = Buffers.newDirectByteBuffer(ALLOCATION_SIZE);
+        }
+
+        currentBuffer.limit(currentBuffer.position() + size);
+        ByteBuffer result = currentBuffer.slice();
+        currentBuffer.position(currentBuffer.limit());
+        currentBuffer.limit(currentBuffer.capacity());
+        return result;
+    }
+    
+
+    public ByteBuffer newDirectByteBuffer(byte[] values, int offset, int lenght) {
+        return (ByteBuffer)newDirectByteBuffer(lenght).put(values, offset, lenght).rewind();
+    }
+
+    public ByteBuffer newDirectByteBuffer(byte[] values, int offset) {
+        return newDirectByteBuffer(values, offset, values.length-offset);
+    }
+
+    public ByteBuffer newDirectByteBuffer(byte[] values) {
+        return newDirectByteBuffer(values, 0);
+    }
+
+    public DoubleBuffer newDirectDoubleBuffer(int numElements) {
+        return newDirectByteBuffer(numElements * Buffers.SIZEOF_DOUBLE).asDoubleBuffer();
+    }
+
+    public DoubleBuffer newDirectDoubleBuffer(double[] values, int offset, int lenght) {
+        return (DoubleBuffer)newDirectDoubleBuffer(lenght).put(values, offset, lenght).rewind();
+    }
+
+    public DoubleBuffer newDirectDoubleBuffer(double[] values, int offset) {
+        return newDirectDoubleBuffer(values, offset, values.length - offset);
+    }
+
+    public DoubleBuffer newDirectDoubleBuffer(double[] values) {
+        return newDirectDoubleBuffer(values, 0);
+    }
+
+    public FloatBuffer newDirectFloatBuffer(int numElements) {
+        return newDirectByteBuffer(numElements * Buffers.SIZEOF_FLOAT).asFloatBuffer();
+    }
+
+    public FloatBuffer newDirectFloatBuffer(float[] values, int offset, int lenght) {
+        return (FloatBuffer)newDirectFloatBuffer(lenght).put(values, offset, lenght).rewind();
+    }
+
+    public FloatBuffer newDirectFloatBuffer(float[] values, int offset) {
+        return newDirectFloatBuffer(values, offset, values.length - offset);
+    }
+
+    public FloatBuffer newDirectFloatBuffer(float[] values) {
+        return newDirectFloatBuffer(values, 0);
+    }
+
+    public IntBuffer newDirectIntBuffer(int numElements) {
+        return newDirectByteBuffer(numElements * Buffers.SIZEOF_INT).asIntBuffer();
+    }
+
+    public IntBuffer newDirectIntBuffer(int[] values, int offset, int lenght) {
+        return (IntBuffer)newDirectIntBuffer(lenght).put(values, offset, lenght).rewind();
+    }
+
+    public IntBuffer newDirectIntBuffer(int[] values, int offset) {
+        return newDirectIntBuffer(values, offset, values.length - offset);
+    }
+
+    public IntBuffer newDirectIntBuffer(int[] values) {
+        return newDirectIntBuffer(values, 0);
+    }
+
+    public LongBuffer newDirectLongBuffer(int numElements) {
+        return newDirectByteBuffer(numElements * Buffers.SIZEOF_LONG).asLongBuffer();
+    }
+
+    public LongBuffer newDirectLongBuffer(long[] values, int offset, int lenght) {
+        return (LongBuffer)newDirectLongBuffer(lenght).put(values, offset, lenght).rewind();
+    }
+
+    public LongBuffer newDirectLongBuffer(long[] values, int offset) {
+        return newDirectLongBuffer(values, offset, values.length - offset);
+    }
+
+    public LongBuffer newDirectLongBuffer(long[] values) {
+        return newDirectLongBuffer(values, 0);
+    }
+
+    public ShortBuffer newDirectShortBuffer(int numElements) {
+        return newDirectByteBuffer(numElements * Buffers.SIZEOF_SHORT).asShortBuffer();
+    }
+
+    public ShortBuffer newDirectShortBuffer(short[] values, int offset, int lenght) {
+        return (ShortBuffer)newDirectShortBuffer(lenght).put(values, offset, lenght).rewind();
+    }
+
+    public ShortBuffer newDirectShortBuffer(short[] values, int offset) {
+        return newDirectShortBuffer(values, offset, values.length - offset);
+    }
+
+    public ShortBuffer newDirectShortBuffer(short[] values) {
+        return newDirectShortBuffer(values, 0);
+    }
+
+    public CharBuffer newDirectCharBuffer(int numElements) {
+        return newDirectByteBuffer(numElements * Buffers.SIZEOF_SHORT).asCharBuffer();
+    }
+
+    public CharBuffer newDirectCharBuffer(char[] values, int offset, int lenght) {
+        return (CharBuffer)newDirectCharBuffer(lenght).put(values, offset, lenght).rewind();
+    }
+
+    public CharBuffer newDirectCharBuffer(char[] values, int offset) {
+        return newDirectCharBuffer(values, offset, values.length - offset);
+    }
+
+    public CharBuffer newDirectCharBuffer(char[] values) {
+        return newDirectCharBuffer(values, 0);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        final CachedBufferFactory other = (CachedBufferFactory) obj;
+        if (this.ALLOCATION_SIZE != other.ALLOCATION_SIZE) {
+            return false;
+        }
+        if (this.currentBuffer != other.currentBuffer && (this.currentBuffer == null || !this.currentBuffer.equals(other.currentBuffer))) {
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        return getClass().getName()+"[static:"+isFixed()+" alloc size:"+getAllocationSize()+"]";
+    }
+    
+    
+    // nothing special, just synchronized
+    private static class SynchronizedCachedBufferFactory extends CachedBufferFactory {
+
+        private SynchronizedCachedBufferFactory() {
+            super();
+        }
+
+        private SynchronizedCachedBufferFactory(int size, int step) {
+            super(size, step);
+        }
+        
+        @Override
+        public synchronized ByteBuffer newDirectByteBuffer(int size) {
+            return super.newDirectByteBuffer(size);
+        }
+        
+    }
+
+}