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How to know to which object instance a field belongs to in javassist?
How do I copy an object in Java?object references an unsaved transient instance - save the transient instance before flushingHow to get a class instance of generics type TConstructor.newInstance() without knowing parameter sequence?Ignoring new fields on JSON objects using JacksonCreate the perfect JPA entityDoes anyone have benchmarks (code & results) comparing performance of Android apps written in Xamarin C# and Java?How to add a SerialVersionUID to a Class[_] instance in Scala?how to access arraylist belonging to an object inside an arraylistjava instantiating object without knowing which subclass it will belong to until runtime
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I'm trying to develop a application using javassist, which should count the number of writes and reads to a field in an object. However when a field is written to inside the constructor it shouldn't be counted, only reads. My problem is that if I have a constructor that receives an object of the same type as a parameter and a field of that object is affected I want to count that write. However I don't know how to know to which object instance in javassist that field belongs to. For example taking this constructor as example:
Person(Person p)
this.firstname = p.firstname;
p.surname = "";
this.surname = p.surname;
I want to count the first and third lines as reads, since a read is valid in a constructor. But the only write I want to count is in the second line since it is a write to a field of a different instance of the object.
At the moment I have search the documentation on javassist and can't find a way to find in runtime to which instance a field belongs to. What I have so far is:
for (CtConstructor ctConstructor : ctClass.getDeclaredConstructors())
ctConstructor.instrument(new ExprEditor()
public void edit(FieldAccess fa) throws CannotCompileException
);
And my problem is in the second condition of the predicate in the lambda function.
The output I'm looking for is Total reads: 2 Total writes: 1, but I either get no writes, or 3 writes and both options are wrong in my problem.
java javassist
asked Mar 23 at 19:58
RuiDTLimaRuiDTLima
1529
add a comment |
I'm trying to develop a application using javassist, which should count the number of writes and reads to a field in an object. However when a field is written to inside the constructor it shouldn't be counted, only reads. My problem is that if I have a constructor that receives an object of the same type as a parameter and a field of that object is affected I want to count that write. However I don't know how to know to which object instance in javassist that field belongs to. For example taking this constructor as example:
Person(Person p)
this.firstname = p.firstname;
p.surname = "";
this.surname = p.surname;
I want to count the first and third lines as reads, since a read is valid in a constructor. But the only write I want to count is in the second line since it is a write to a field of a different instance of the object.
At the moment I have search the documentation on javassist and can't find a way to find in runtime to which instance a field belongs to. What I have so far is:
for (CtConstructor ctConstructor : ctClass.getDeclaredConstructors())
ctConstructor.instrument(new ExprEditor()
public void edit(FieldAccess fa) throws CannotCompileException
);
And my problem is in the second condition of the predicate in the lambda function.
The output I'm looking for is Total reads: 2 Total writes: 1, but I either get no writes, or 3 writes and both options are wrong in my problem.
java javassist
asked Mar 23 at 19:58
RuiDTLimaRuiDTLima
1529
Your copy constructor should never try to modify the content of the input argument.
– FredK
Mar 23 at 20:16
add a comment |
I'm trying to develop a application using javassist, which should count the number of writes and reads to a field in an object. However when a field is written to inside the constructor it shouldn't be counted, only reads. My problem is that if I have a constructor that receives an object of the same type as a parameter and a field of that object is affected I want to count that write. However I don't know how to know to which object instance in javassist that field belongs to. For example taking this constructor as example:
Person(Person p)
this.firstname = p.firstname;
p.surname = "";
this.surname = p.surname;
I want to count the first and third lines as reads, since a read is valid in a constructor. But the only write I want to count is in the second line since it is a write to a field of a different instance of the object.
At the moment I have search the documentation on javassist and can't find a way to find in runtime to which instance a field belongs to. What I have so far is:
for (CtConstructor ctConstructor : ctClass.getDeclaredConstructors())
ctConstructor.instrument(new ExprEditor()
public void edit(FieldAccess fa) throws CannotCompileException
);
And my problem is in the second condition of the predicate in the lambda function.
The output I'm looking for is Total reads: 2 Total writes: 1, but I either get no writes, or 3 writes and both options are wrong in my problem.
java javassist
asked Mar 23 at 19:58
RuiDTLimaRuiDTLima
1529
I'm trying to develop a application using javassist, which should count the number of writes and reads to a field in an object. However when a field is written to inside the constructor it shouldn't be counted, only reads. My problem is that if I have a constructor that receives an object of the same type as a parameter and a field of that object is affected I want to count that write. However I don't know how to know to which object instance in javassist that field belongs to. For example taking this constructor as example:
Person(Person p)
this.firstname = p.firstname;
p.surname = "";
this.surname = p.surname;
I want to count the first and third lines as reads, since a read is valid in a constructor. But the only write I want to count is in the second line since it is a write to a field of a different instance of the object.
At the moment I have search the documentation on javassist and can't find a way to find in runtime to which instance a field belongs to. What I have so far is:
for (CtConstructor ctConstructor : ctClass.getDeclaredConstructors())
ctConstructor.instrument(new ExprEditor()
public void edit(FieldAccess fa) throws CannotCompileException
);
And my problem is in the second condition of the predicate in the lambda function.
The output I'm looking for is Total reads: 2 Total writes: 1, but I either get no writes, or 3 writes and both options are wrong in my problem.
java javassist
java javassist
asked Mar 23 at 19:58
RuiDTLimaRuiDTLima
1529
asked Mar 23 at 19:58
RuiDTLimaRuiDTLima
1529
asked Mar 23 at 19:58
RuiDTLimaRuiDTLima
1529
asked Mar 23 at 19:58
RuiDTLimaRuiDTLima
1529
asked Mar 23 at 19:58
RuiDTLimaRuiDTLima
1529
1529
Your copy constructor should never try to modify the content of the input argument.
– FredK
Mar 23 at 20:16
add a comment |
Your copy constructor should never try to modify the content of the input argument.
– FredK
Mar 23 at 20:16
Your copy constructor should never try to modify the content of the input argument.
– FredK
Mar 23 at 20:16
Your copy constructor should never try to modify the content of the input argument.
– FredK
Mar 23 at 20:16
add a comment |
1 Answer
1
active
oldest
votes
You only know to which object instance a field belongs during the runtime. You need to inject code that verifies it. One possible solution is to inject this code
if (this != $0) writeCounter++;
Remember that it is only possible because the field you want to count is an instance and not a static field.
answered Mar 24 at 12:28
nvelosonveloso
262
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You only know to which object instance a field belongs during the runtime. You need to inject code that verifies it. One possible solution is to inject this code
if (this != $0) writeCounter++;
Remember that it is only possible because the field you want to count is an instance and not a static field.
answered Mar 24 at 12:28
nvelosonveloso
262
add a comment |
You only know to which object instance a field belongs during the runtime. You need to inject code that verifies it. One possible solution is to inject this code
if (this != $0) writeCounter++;
Remember that it is only possible because the field you want to count is an instance and not a static field.
answered Mar 24 at 12:28
nvelosonveloso
262
add a comment |
You only know to which object instance a field belongs during the runtime. You need to inject code that verifies it. One possible solution is to inject this code
if (this != $0) writeCounter++;
Remember that it is only possible because the field you want to count is an instance and not a static field.
answered Mar 24 at 12:28
nvelosonveloso
262
You only know to which object instance a field belongs during the runtime. You need to inject code that verifies it. One possible solution is to inject this code
if (this != $0) writeCounter++;
Remember that it is only possible because the field you want to count is an instance and not a static field.
answered Mar 24 at 12:28
nvelosonveloso
262
answered Mar 24 at 12:28
nvelosonveloso
262
answered Mar 24 at 12:28
nvelosonveloso
262
answered Mar 24 at 12:28
nvelosonveloso
262
262
add a comment |
add a comment |
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Your copy constructor should never try to modify the content of the input argument.
– FredK
Mar 23 at 20:16