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1
4 package com.tc.util;
5
6 import sun.misc.Unsafe;
7
8 import com.tc.exception.TCRuntimeException;
9 import com.tc.object.TCObject;
10 import com.tc.object.bytecode.ManagerUtil;
11
12 import java.lang.reflect.Field  ;
13
14
17 public class UnsafeUtil {
18 public final static String CLASS_SLASH = "com/tc/util/UnsafeUtil";
19 public final static String CLASS_DESCRIPTION = "Lcom/tc/util/UnsafeUtil;";
20 private final static Unsafe unsafe = findUnsafe();
21
22 private UnsafeUtil() {
23 }
25
26 public static void updateDSOSharedField(Object obj, long fieldOffset, Object update) {
27 TCObject tcObject = ManagerUtil.lookupExistingOrNull(obj);
28 if (tcObject == null) { throw new NullPointerException ("Object is not a DSO shared object."); }
29 tcObject.objectFieldChangedByOffset(obj.getClass().getName(), fieldOffset, update, -1);
30 }
31
32 public static void setField(Object obj, Field field, Object value) {
33 long offset = unsafe.objectFieldOffset(field);
34 unsafe.putObject(obj, offset, value);
35 }
36
37 public static void monitorEnter(Object obj) {
38 unsafe.monitorEnter(obj);
39 }
40
41 public static void monitorExit(Object obj) {
42 unsafe.monitorExit(obj);
43 }
44
45 public static Unsafe getUnsafe() {
46 return unsafe;
47 }
48
49 private static Unsafe findUnsafe() {
50 Class uc = Unsafe.class;
51 Field [] fields = uc.getDeclaredFields();
52 for (int i = 0; i < fields.length; i++) {
53 if (fields[i].getName().equals("theUnsafe")) {
54 fields[i].setAccessible(true);
55 try {
56 return (Unsafe) fields[i].get(uc);
57 } catch (IllegalArgumentException e) {
58 throw new TCRuntimeException(e);
59 } catch (IllegalAccessException e) {
60 throw new TCRuntimeException(e);
61 }
62 }
63 }
64 return null;
65 }
66 }
67 |
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