-
Notifications
You must be signed in to change notification settings - Fork 14
/
LazyLoadingTransformer.java
142 lines (124 loc) · 4.3 KB
/
LazyLoadingTransformer.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
/**
* Copyright (C) 2016 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jopa.owlapi.instrumentation;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.Instrumentation;
import java.util.HashSet;
import java.util.Set;
import javassist.CannotCompileException;
import javassist.ClassPool;
import javassist.CtBehavior;
import javassist.CtClass;
import javassist.CtField;
import javassist.CtMethod;
import javassist.NotFoundException;
import cz.cvut.kbss.jopa.FetchType;
import cz.cvut.kbss.jopa.OWLClass;
import cz.cvut.kbss.jopa.OWLSequence;
public class LazyLoadingTransformer implements ClassFileTransformer {
public static void premain(String agentArgument,
Instrumentation instrumentation) {
System.out.println("Starting OWLPersistence Agent.");
instrumentation.addTransformer(new LazyLoadingTransformer());
}
String[] ignore = new String[] { "sun/", "java/", "javax/" };
public byte[] transform(ClassLoader loader, String className,
Class<?> clazz, java.security.ProtectionDomain domain, byte[] bytes) {
for (int i = 0; i < ignore.length; i++) {
if (className.startsWith(ignore[i])) {
return bytes;
}
}
return doClass(className, clazz, bytes);
}
private byte[] doClass(String name, Class<?> clazz, byte[] b) {
ClassPool pool = ClassPool.getDefault();
CtClass cl = null;
try {
cl = pool.makeClass(new java.io.ByteArrayInputStream(b));
if (!cl.isInterface()) {
boolean owlClass = false;
for (final Object o : cl.getAnnotations()) {
if (o instanceof OWLClass) {
owlClass = true;
continue;
}
}
if (owlClass) {
Set<CtMethod> setters = new HashSet<CtMethod>();
Set<CtMethod> getters = new HashSet<CtMethod>();
System.out.println("Processing OWLClass : " + name);
for (final CtField f : cl.getDeclaredFields()) {
final String setterName = "set"
+ f.getName().substring(0, 1).toUpperCase()
+ f.getName().substring(1);
try {
final CtMethod setter = cl.getMethod(setterName,
"(" + f.getSignature() + ")V");
setters.add(setter);
System.out.println("Registering setter - "
+ setter.getName());
} catch (NotFoundException e) {
;
}
final String getterName = "get"
+ f.getName().substring(0, 1).toUpperCase()
+ f.getName().substring(1);
try {
final CtMethod getter = cl.getMethod(getterName,
"()" + f.getSignature() + "");
getters.add(getter);
System.out.println("Registering getter - "
+ getter.getName());
} catch (NotFoundException e) {
;
}
}
for (CtBehavior method : cl.getDeclaredBehaviors()) {
if (setters.contains(method)) {
doSetter(method);
} else if (getters.contains(method)) {
doGetter(method);
}
}
}
b = cl.toBytecode();
}
} catch (Exception e) {
System.err.println("Could not instrument " + name
+ ", exception : " + e.getMessage());
} finally {
if (cl != null) {
cl.detach();
}
}
return b;
}
private void doSetter(CtBehavior method) throws NotFoundException,
CannotCompileException {
method.insertBefore("System.out.println(\"Setting\");");
}
private void doGetter(CtBehavior getter) throws NotFoundException,
CannotCompileException {
// gmethod.insertBefore("this."
// + method.getName().substring(3).toLowerCase()
// + "=\"URI.create(\"http://x\");\"");
// if (FetchType.LAZY.equals(seq.fetchType())) {
System.out.println("Registering lazy initialization fetcher for "+ getter.getName().substring(3).toLowerCase());
// getter.insertBefore(seq.fetchType()."System.out.println(\"Getting\");");
//
// }
}
}