| 1 | /* |
| 2 | * $Id: NativeResourceRef.java,v 1.2 2004/08/19 02:15:25 hastings Exp $ |
| 3 | * |
| 4 | * (c) Copyright, Moebius Solutions, Inc., 2004 |
| 5 | * |
| 6 | * All Rights Reserved |
| 7 | * |
| 8 | * This material may be reproduced by or for the U. S. Government |
| 9 | * pursuant to the copyright license under the clause at |
| 10 | * DFARS 252.227-7014 (OCT 2001). |
| 11 | */ |
| 12 | |
| 13 | package com.moesol.bindings.platform_sdk.windows_api; |
| 14 | |
| 15 | import java.lang.ref.PhantomReference; |
| 16 | import java.lang.ref.ReferenceQueue; |
| 17 | import java.util.Collections; |
| 18 | import java.util.HashMap; |
| 19 | import java.util.Map; |
| 20 | import java.util.logging.Level; |
| 21 | import java.util.logging.Logger; |
| 22 | |
| 23 | import com.moesol.bindings.AllocationLocation; |
| 24 | import com.moesol.bindings.NativeLeakDetectionThread; |
| 25 | import com.moesol.bindings.NativeResourceChecker; |
| 26 | |
| 27 | |
| 28 | /** |
| 29 | * Check for native handle leaks. A handle is any |
| 30 | * java object which holds a native pointer. |
| 31 | * |
| 32 | * @author robert |
| 33 | */ |
| 34 | public class NativeResourceRef extends PhantomReference |
| 35 | implements NativeResourceChecker |
| 36 | { |
| 37 | /** call from assert always returns true */ |
| 38 | public static boolean recordCreateLocation(Object holder, long native_handle) { |
| 39 | if (native_handle == 0) { |
| 40 | return true; |
| 41 | } |
| 42 | g_owned_handles.put(new Long(native_handle), new NativeResourceRef(holder, |
| 43 | NativeLeakDetectionThread.instance().getQ())); |
| 44 | return true; |
| 45 | } |
| 46 | |
| 47 | /** call from assert always returns true */ |
| 48 | public static boolean removeCreateLocation(long native_handle) { |
| 49 | if (native_handle == 0) { |
| 50 | return true; |
| 51 | } |
| 52 | NativeResourceRef c = (NativeResourceRef) g_owned_handles.remove(new Long( |
| 53 | native_handle)); |
| 54 | if (c != null) { |
| 55 | c.release(); |
| 56 | } |
| 57 | return true; |
| 58 | } |
| 59 | |
| 60 | private NativeResourceRef(Object h, ReferenceQueue q) { |
| 61 | super(h, q); |
| 62 | } |
| 63 | public void check() { |
| 64 | assert(isReleased() || reportLeak()); |
| 65 | } |
| 66 | private void release() { |
| 67 | clear(); |
| 68 | m_create_location = null; |
| 69 | } |
| 70 | private boolean isReleased() { |
| 71 | return m_create_location == null; |
| 72 | } |
| 73 | private boolean reportLeak() { |
| 74 | logger.log(Level.WARNING, "m_handle leaked " + this, |
| 75 | m_create_location); |
| 76 | incLeakCount(); |
| 77 | return true; |
| 78 | } |
| 79 | |
| 80 | public synchronized static long getLeakCount() { |
| 81 | return g_leak_count; |
| 82 | } |
| 83 | private synchronized static void incLeakCount() { |
| 84 | g_leak_count++; |
| 85 | } |
| 86 | |
| 87 | private static Logger logger = Logger.getLogger(NativeResourceRef.class.getName()); |
| 88 | private static long g_leak_count = 0; |
| 89 | |
| 90 | private AllocationLocation m_create_location = new AllocationLocation(); |
| 91 | private static Map g_owned_handles = Collections.synchronizedMap(new HashMap()); |
| 92 | } |