diff --git a/engine/src/core/com/jme3/util/BufferUtils.java b/engine/src/core/com/jme3/util/BufferUtils.java index b334e6fd4..324871b9e 100644 --- a/engine/src/core/com/jme3/util/BufferUtils.java +++ b/engine/src/core/com/jme3/util/BufferUtils.java @@ -35,11 +35,15 @@ import com.jme3.math.ColorRGBA; import com.jme3.math.Quaternion; import com.jme3.math.Vector2f; import com.jme3.math.Vector3f; +import java.lang.reflect.InvocationTargetException; +import java.lang.reflect.Method; import java.nio.*; import java.util.ArrayList; import java.util.Collections; import java.util.Map; import java.util.WeakHashMap; +import java.util.logging.Level; +import java.util.logging.Logger; /** * BufferUtils is a helper class for generating nio buffers from @@ -1139,4 +1143,38 @@ public final class BufferUtils { System.out.println(store.toString()); } } + + /** + * DirectByteBuffers are garbage collected by using a phantom reference and a + * reference queue. Every once a while, the JVM checks the reference queue and + * cleans the DirectByteBuffers. However, as this doesn't happen + * immediately after discarding all references to a DirectByteBuffer, it's + * easy to OutOfMemoryError yourself using DirectByteBuffers. This function + * explicitly calls the Cleaner method of a DirectByteBuffer. + * + * @param toBeDestroyed + * The DirectByteBuffer that will be "cleaned". Utilizes reflection. + * + */ + public static void destroyDirectByteBuffer(ByteBuffer toBeDestroyed) { + try { + Method cleanerMethod = toBeDestroyed.getClass().getMethod("cleaner"); + cleanerMethod.setAccessible(true); + Object cleaner = cleanerMethod.invoke(toBeDestroyed); + Method cleanMethod = cleaner.getClass().getMethod("clean"); + cleanMethod.setAccessible(true); + cleanMethod.invoke(cleaner); + } catch (IllegalAccessException ex) { + Logger.getLogger(BufferUtils.class.getName()).log(Level.SEVERE, "{0}", ex); + } catch (IllegalArgumentException ex) { + Logger.getLogger(BufferUtils.class.getName()).log(Level.SEVERE, "{0}", ex); + } catch (InvocationTargetException ex) { + Logger.getLogger(BufferUtils.class.getName()).log(Level.SEVERE, "{0}", ex); + } catch (NoSuchMethodException ex) { + Logger.getLogger(BufferUtils.class.getName()).log(Level.SEVERE, "{0}", ex); + } catch (SecurityException ex) { + Logger.getLogger(BufferUtils.class.getName()).log(Level.SEVERE, "{0}", ex); + } + } + } diff --git a/engine/src/test/jme3test/app/TestReleaseDirectMemory.java b/engine/src/test/jme3test/app/TestReleaseDirectMemory.java new file mode 100644 index 000000000..043997221 --- /dev/null +++ b/engine/src/test/jme3test/app/TestReleaseDirectMemory.java @@ -0,0 +1,70 @@ +/* + * Copyright (c) 2009-2010 jMonkeyEngine + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * 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. + * + * * Neither the name of 'jMonkeyEngine' nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "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 THE COPYRIGHT OWNER 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. + */ + +package jme3test.app; + +import jme3test.model.shape.*; +import com.jme3.app.SimpleApplication; +import com.jme3.material.Material; +import com.jme3.math.Vector3f; +import com.jme3.scene.Geometry; +import com.jme3.scene.shape.Box; +import com.jme3.util.BufferUtils; +import java.lang.reflect.InvocationTargetException; +import java.nio.ByteBuffer; +import java.util.logging.Level; +import java.util.logging.Logger; + +public class TestReleaseDirectMemory extends SimpleApplication { + + public static void main(String[] args){ + TestReleaseDirectMemory app = new TestReleaseDirectMemory(); + app.start(); + } + + @Override + public void simpleInitApp() { + Box b = new Box(Vector3f.ZERO, 1, 1, 1); + Geometry geom = new Geometry("Box", b); + Material mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md"); + mat.setTexture("ColorMap", assetManager.loadTexture("Interface/Logo/Monkey.jpg")); + geom.setMaterial(mat); + rootNode.attachChild(geom); + } + + @Override + public void simpleUpdate(float tpf) { + ByteBuffer buf = BufferUtils.createByteBuffer(500000); + BufferUtils.destroyDirectByteBuffer(buf); + } + +}