The RemoteJ Compiler/Generator Implementation - Autonomics Development: A Domain-Specific Aspect Language Approach - page 77

IProtocol p;

generate() {
p = ProtocolFactory.getProtocol(name);
p.setOptions(protocolOptions);
p.validateOptions();
p.generateProtocol();
}

ProtocolFactory Generator

<<interface>>
IProtocol

Contains common
weaving functionality

Protocol

RMIProtocol JMSProtocol RESTProtocol ...Protocol

Javassist

Figure 5.2. Extendible code generation support.

public interface IProtocol {
void validateOptions() throws OptionException;
void setOptions(ProtocolOptions opt);
void setServerOutputDirectory(String serverOutputDirectory);
void setClientOutputDirectory(String clientOutputDirectory);
void setService(String spelling);
void setImports(Vector<String> imports);
void setReporter(ErrorHandler reporter);
void setLineNumber(SourcePosition position);
void setRecovery(Vector<JavaMethod> recovery);
void setProtocolDescription(ProtocolDescription protocols);
void generateAll();

}

Figure 5.3. IProtocol class.

This approach makes it relatively easy to add additional protocols as no
changes need to be made to the language or the compiler/generator to support
new protocols and their options.

5.2.1 Bytecode Rewriting

The RemoteJ compiler/generator uses the Javassist [19] library, a bytecode rewrit-
ing library used by the JBoss AOP framework [54], for all bytecode rewriting.