org.hotswap.agent.plugin.proxy

Class AbstractProxyBytecodeTransformer

java.lang.Object

org.hotswap.agent.plugin.proxy.AbstractProxyBytecodeTransformer

All Implemented Interfaces:

ProxyBytecodeTransformer

Direct Known Subclasses:

CglibProxyBytecodeTransformer, JavaProxyBytecodeTransformer

public abstract class AbstractProxyBytecodeTransformer
extends Object
implements ProxyBytecodeTransformer

Transforms the bytecode of a new proxy definition so it is initialized on the first access of one of its methods.

Author:

Erki Ehtla

Field Summary

Fields inherited from interface org.hotswap.agent.plugin.proxy.ProxyBytecodeTransformer

INIT_FIELD_PREFIX

Constructor Summary

Constructors

Constructor and Description
AbstractProxyBytecodeTransformer(ClassPool classPool)

Method Summary

Modifier and Type	Method and Description
protected void	addInitCallToMethods(CtClass cc, String clinitFieldName, String initCall) Adds the initCall as Java code to all the non static methods of the class.
protected void	addStaticInitStateField(CtClass cc, String clinitFieldName) Adds a static boolean field to the class indicating the state of initialization
protected String	generateRandomString()
protected abstract String	getInitCall(CtClass cc, String random) Builds the Java code String which should be executed to initialize the proxy
byte[]	transform(byte[] byteCode)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AbstractProxyBytecodeTransformer

public AbstractProxyBytecodeTransformer(ClassPool classPool)

Parameters:

classPool - Classpool used to make a CtClass

Method Detail

transform

public byte[] transform(byte[] byteCode)
                 throws Exception

Specified by:

transform in interface ProxyBytecodeTransformer

Throws:

Exception

getInitCall

protected abstract String getInitCall(CtClass cc,
                                      String random)
                               throws Exception

Builds the Java code String which should be executed to initialize the proxy

Parameters:

cc - CtClass from new definition

random - randomly generated String

Returns:

Java code to call init the proxy

Throws:

Exception

generateRandomString

protected String generateRandomString()

addInitCallToMethods

protected void addInitCallToMethods(CtClass cc,
                                    String clinitFieldName,
                                    String initCall)
                             throws Exception

Adds the initCall as Java code to all the non static methods of the class. The initialization is only done if clinitFieldName is false. Responsibility to set the clinitFieldName is on the initCall.

Parameters:

cc - CtClass to be modified

clinitFieldName - field name in CtClass

initCall - Java code to initialize the Proxy

Throws:

Exception

addStaticInitStateField

protected void addStaticInitStateField(CtClass cc,
                                       String clinitFieldName)
                                throws Exception

Adds a static boolean field to the class indicating the state of initialization

Parameters:

cc - CtClass to be modified

clinitFieldName - field name in CtClass

Throws:

Exception