net.openhft.chronicle.wire

Interface GeneratingMethodReaderInterceptorReturns

All Superinterfaces:

net.openhft.chronicle.bytes.MethodReaderInterceptorReturns

public interface GeneratingMethodReaderInterceptorReturns
extends net.openhft.chronicle.bytes.MethodReaderInterceptorReturns

This interface is a version of method reader interceptor that allows to change the logic of MethodReader without overhead provided by reflexive calls.

Code returned by codeBeforeCall(Method, String, String[]) and codeAfterCall(Method, String, String[]) will be added before and after actual method call in the generated source code of the method reader. It's possible to use original call arguments and object instance in the added code.

Simple example that allows to skip call of method "foo" in case its second argument is null:

     public String codeBeforeCall(Method m, String objectName, String[] argumentNames) {
         if (m.getName().equals("foo"))
             return "if (" + argumentNames[1] + " != null) {";
         else
             return "";
     }

     public String codeAfterCall(Method m, String objectName, String[] argumentNames) {
         if (m.getName().equals("foo"))
             return "}";
         else
             return "";
     }
 

Please mind that if provided code fails to compile, reflexive method call will be delegated to the interceptor with MethodReaderInterceptorReturns.intercept(Method, Object, Object[], Invocation), like it happens with a regular MethodReaderInterceptorReturns.

Method Summary

Modifier and Type	Method and Description
String	codeAfterCall(Method m, String objectName, String[] argumentNames)
String	codeBeforeCall(Method m, String objectName, String[] argumentNames)
String	generatorId() Specifies ID of this generating interceptor. Contract: if the code provided by generating interceptor differs from the code provided by another generating interceptor, theirs IDs should be different as well.

Methods inherited from interface net.openhft.chronicle.bytes.MethodReaderInterceptorReturns

intercept

Method Detail

generatorId

String generatorId()

Specifies ID of this generating interceptor.
Contract: if the code provided by generating interceptor differs from the code provided by another generating interceptor, theirs IDs should be different as well. Provided ID will be used in the classname of a generated method reader to ensure re-compilation when a new generator is passed.

Returns:

ID of this generator.

codeBeforeCall

String codeBeforeCall(Method m,
                      String objectName,
                      String[] argumentNames)

Parameters:

m - Calling method.

objectName - Object instance name.

argumentNames - Call argument names.

Returns:

Source code to add before the method call.

codeAfterCall

String codeAfterCall(Method m,
                     String objectName,
                     String[] argumentNames)

Parameters:

m - Calling method.

objectName - Object instance name.

argumentNames - Call argument names.

Returns:

Source code to add after the method call.