JRuntime
JRuntime is the simple library for Java. It makes easier an access to Java 6 compiler API.
This library provide us with capability to compile, execute and modify Java-code dynamically during working of the program.
Usage
Dynamic class compilation
String classDef =
"public class MyClass {"+
" public String toString() {" +
" return \"MyClass\";" +
" }"+
"}";
RuntimeClass runtimeClass = new RuntimeClass(classDef);
System.out.println(runtimeClass.newInstance());Dynamic block execution
RuntimeBlock sum = new RuntimeBlock(
"return (Integer)params[0]+(Integer)params[1];");
System.out.println(sum.invoke(1, 2));
System.out.println(sum.invoke(5, 100));Dynamic class modification
public class ClassToModify {
public String simpleMethod(String text) {
System.out.println("Text: " + text);
return text;
}
}
...
MutableRuntimeClass<ClassToModify> clazz =
new MutableRuntimeClass<ClassToModify>(ClassToModify.class);
ClassToModify instance = clazz.newInstance(new SimpleMutator() {
@Override
public void onBeforeMethod(Object instance, Method method,
Object... params) {
System.out.println("Before method: " + method.getName() +
", params: " + Arrays.toString(params));
}
@Override
public Object onAfterMethod(Object instance, Method method,
Object result, Object... params) {
System.out.println("After method: " + method.getName() +
", params: " + Arrays.toString(params));
return result;
}
});
instance.simpleMethod("Test mutable class!!!");