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package org.jvnet.hk2.internal;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.RandomAccess;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.glassfish.hk2.utilities.reflection.ReflectionHelper;
import javassist.util.proxy.MethodHandler;
/**
* This is the handler that runs the aopalliance method interception
*
* @author jwells
*
*/
public class MethodInterceptorHandler implements MethodHandler {
private final ServiceLocatorImpl locator;
private final Map<Method, List<MethodInterceptor>> interceptorLists;
/* package */ MethodInterceptorHandler(ServiceLocatorImpl locator,
Map<Method, List<MethodInterceptor>> interceptorLists) {
this.locator = locator;
this.interceptorLists = interceptorLists;
}
/* (non-Javadoc)
* @see javassist.util.proxy.MethodHandler#invoke(java.lang.Object, java.lang.reflect.Method, java.lang.reflect.Method, java.lang.Object[])
*/
@Override
public Object invoke(Object self, Method thisMethod, Method proceed, Object[] args)
throws Throwable {
List<MethodInterceptor> interceptors = interceptorLists.get(thisMethod);
if (interceptors == null || interceptors.isEmpty()) {
return ReflectionHelper.invoke(self, proceed, args, locator.getNeutralContextClassLoader());
}
if (!(interceptors instanceof RandomAccess)) {
// Make sure we are indexable
interceptors = new ArrayList<MethodInterceptor>(interceptors);
}
MethodInterceptor nextInterceptor = interceptors.get(0);
return nextInterceptor.invoke(new MethodInvocationImpl(args,
thisMethod, self, interceptors, 0, proceed));
}
private class MethodInvocationImpl implements MethodInvocation {
private final Object[] arguments; // Live!
private final Method method;
private final Object myself;
private final List<MethodInterceptor> interceptors;
private final int index;
private final Method proceed;
private MethodInvocationImpl(Object[] arguments,
Method method,
Object myself,
List<MethodInterceptor> interceptors,
int index,
Method proceed) {
this.arguments = arguments;
this.method = method;
this.myself = myself;
this.interceptors = interceptors;
this.index = index;
this.proceed = proceed;
}
@Override
public Object[] getArguments() {
return arguments;
}
@Override
public AccessibleObject getStaticPart() {
return method;
}
@Override
public Object getThis() {
return myself;
}
@Override
public Method getMethod() {
return method;
}
@Override
public Object proceed() throws Throwable {
int newIndex = index + 1;
if (newIndex >= interceptors.size()) {
// Call the actual method
return ReflectionHelper.invoke(myself, proceed, arguments, locator.getNeutralContextClassLoader());
}
// Invoke the next interceptor
MethodInterceptor nextInterceptor = interceptors.get(newIndex);
return nextInterceptor.invoke(new MethodInvocationImpl(arguments,
method, myself, interceptors, newIndex, proceed));
}
}
}