Mixing
How to define a new method and intercept and delegate a call to that method?
I am solving a problem for a school work. let us say I have a class as follows
class test {
public String foo(int i) {
printvalue(i);
return "foo";
}
public void printvalue(int i) {
System.out.println(i);
}
}
class Solution {
public static void main(String args) {
System.out.println(new test().foo(10));
}
}
output is
10
foo
Now I'm creating a java agent which will intercept all calls to foo and I want to create a new method in bar as follows and replace all calls to foo to just call bar(int i) and then return.
public String bar(int i) {
printvalue(i);
return "bar";
}
so the output of main should change to
10
bar
How can I achieve this. I was looking to use bytebuddy or javassist to do this. Any help is appreciated
javassist byte-buddy
asked Jan 1 at 4:59
user3450935user3450935
11
add a comment |
I am solving a problem for a school work. let us say I have a class as follows
class test {
public String foo(int i) {
printvalue(i);
return "foo";
}
public void printvalue(int i) {
System.out.println(i);
}
}
class Solution {
public static void main(String args) {
System.out.println(new test().foo(10));
}
}
output is
10
foo
Now I'm creating a java agent which will intercept all calls to foo and I want to create a new method in bar as follows and replace all calls to foo to just call bar(int i) and then return.
public String bar(int i) {
printvalue(i);
return "bar";
}
so the output of main should change to
10
bar
How can I achieve this. I was looking to use bytebuddy or javassist to do this. Any help is appreciated
javassist byte-buddy
asked Jan 1 at 4:59
user3450935user3450935
11
You can check aspect oriented programming in java. Write a decorator to intercept the call.
– Lokesh Agrawal
Jan 1 at 17:26
add a comment |
I am solving a problem for a school work. let us say I have a class as follows
class test {
public String foo(int i) {
printvalue(i);
return "foo";
}
public void printvalue(int i) {
System.out.println(i);
}
}
class Solution {
public static void main(String args) {
System.out.println(new test().foo(10));
}
}
output is
10
foo
Now I'm creating a java agent which will intercept all calls to foo and I want to create a new method in bar as follows and replace all calls to foo to just call bar(int i) and then return.
public String bar(int i) {
printvalue(i);
return "bar";
}
so the output of main should change to
10
bar
How can I achieve this. I was looking to use bytebuddy or javassist to do this. Any help is appreciated
javassist byte-buddy
asked Jan 1 at 4:59
user3450935user3450935
11
I am solving a problem for a school work. let us say I have a class as follows
class test {
public String foo(int i) {
printvalue(i);
return "foo";
}
public void printvalue(int i) {
System.out.println(i);
}
}
class Solution {
public static void main(String args) {
System.out.println(new test().foo(10));
}
}
output is
10
foo
Now I'm creating a java agent which will intercept all calls to foo and I want to create a new method in bar as follows and replace all calls to foo to just call bar(int i) and then return.
public String bar(int i) {
printvalue(i);
return "bar";
}
so the output of main should change to
10
bar
How can I achieve this. I was looking to use bytebuddy or javassist to do this. Any help is appreciated
javassist byte-buddy
javassist byte-buddy
asked Jan 1 at 4:59
user3450935user3450935
11
asked Jan 1 at 4:59
user3450935user3450935
11
edited Jan 1 at 16:56
user3450935
asked Jan 1 at 4:59
user3450935user3450935
11
asked Jan 1 at 4:59
user3450935user3450935
11
asked Jan 1 at 4:59
user3450935user3450935
11
11
You can check aspect oriented programming in java. Write a decorator to intercept the call.
– Lokesh Agrawal
Jan 1 at 17:26
add a comment |
You can check aspect oriented programming in java. Write a decorator to intercept the call.
– Lokesh Agrawal
Jan 1 at 17:26
You can check aspect oriented programming in java. Write a decorator to intercept the call.
– Lokesh Agrawal
Jan 1 at 17:26
You can check aspect oriented programming in java. Write a decorator to intercept the call.
– Lokesh Agrawal
Jan 1 at 17:26
add a comment |
1 Answer
1
active
oldest
votes
This is possible in Byte Buddy by using a MemberSubstitution. In the DSL, you can write:
MemberSubstitution.relaxed()
.method(ElementMatchers.named("foo"))
.replaceWith(ElementMatchers.named("bar"))
You can register this visitor using an AgentBuilder that implements the agent.
You can implement a custom method using the builder DSL where you can provide the implementation as a combination of MethodCall and FixedValue.
answered Jan 5 at 17:51
Rafael WinterhalterRafael Winterhalter
28k1367145
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
This is possible in Byte Buddy by using a MemberSubstitution. In the DSL, you can write:
MemberSubstitution.relaxed()
.method(ElementMatchers.named("foo"))
.replaceWith(ElementMatchers.named("bar"))
You can register this visitor using an AgentBuilder that implements the agent.
You can implement a custom method using the builder DSL where you can provide the implementation as a combination of MethodCall and FixedValue.
answered Jan 5 at 17:51
Rafael WinterhalterRafael Winterhalter
28k1367145
add a comment |
This is possible in Byte Buddy by using a MemberSubstitution. In the DSL, you can write:
MemberSubstitution.relaxed()
.method(ElementMatchers.named("foo"))
.replaceWith(ElementMatchers.named("bar"))
You can register this visitor using an AgentBuilder that implements the agent.
You can implement a custom method using the builder DSL where you can provide the implementation as a combination of MethodCall and FixedValue.
answered Jan 5 at 17:51
Rafael WinterhalterRafael Winterhalter
28k1367145
add a comment |
This is possible in Byte Buddy by using a MemberSubstitution. In the DSL, you can write:
MemberSubstitution.relaxed()
.method(ElementMatchers.named("foo"))
.replaceWith(ElementMatchers.named("bar"))
You can register this visitor using an AgentBuilder that implements the agent.
You can implement a custom method using the builder DSL where you can provide the implementation as a combination of MethodCall and FixedValue.
answered Jan 5 at 17:51
Rafael WinterhalterRafael Winterhalter
28k1367145
This is possible in Byte Buddy by using a MemberSubstitution. In the DSL, you can write:
MemberSubstitution.relaxed()
.method(ElementMatchers.named("foo"))
.replaceWith(ElementMatchers.named("bar"))
You can register this visitor using an AgentBuilder that implements the agent.
You can implement a custom method using the builder DSL where you can provide the implementation as a combination of MethodCall and FixedValue.
answered Jan 5 at 17:51
Rafael WinterhalterRafael Winterhalter
28k1367145
answered Jan 5 at 17:51
Rafael WinterhalterRafael Winterhalter
28k1367145
answered Jan 5 at 17:51
Rafael WinterhalterRafael Winterhalter
28k1367145
answered Jan 5 at 17:51
Rafael WinterhalterRafael Winterhalter
28k1367145
28k1367145
add a comment |
add a comment |
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You can check aspect oriented programming in java. Write a decorator to intercept the call.
– Lokesh Agrawal
Jan 1 at 17:26