org.jvnet.hk2.internal.MethodInterceptorHandler Maven / Gradle / Ivy
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package org.jvnet.hk2.internal;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.HashMap;
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.api.AOPProxyCtl;
import org.glassfish.hk2.api.ActiveDescriptor;
import org.glassfish.hk2.api.HK2Invocation;
import org.glassfish.hk2.utilities.reflection.Logger;
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 static boolean DEBUG_INTERCEPTION = AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Boolean run() {
return Boolean.parseBoolean(
System.getProperty("org.jvnet.hk2.properties.tracing.interceptors", "false"));
}
});
private final ServiceLocatorImpl locator;
private final Map> interceptorLists;
private final ActiveDescriptor underlyingDescriptor;
/* package */ MethodInterceptorHandler(ServiceLocatorImpl locator,
ActiveDescriptor underlyingDescriptor,
Map> interceptorLists) {
this.locator = locator;
this.interceptorLists = interceptorLists;
this.underlyingDescriptor = underlyingDescriptor;
}
/* (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 {
if (thisMethod.getName().equals(AOPProxyCtl.UNDERLYING_METHOD_NAME)) {
return underlyingDescriptor;
}
List 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(interceptors);
}
MethodInterceptor nextInterceptor = interceptors.get(0);
long aggregateInterceptionTime = 0L;
if (DEBUG_INTERCEPTION) {
aggregateInterceptionTime = System.currentTimeMillis();
Logger.getLogger().debug("Invoking interceptor " + nextInterceptor.getClass().getName() +
" index 0 in stack of " + interceptors.size() + " of method " + thisMethod);
}
try {
return nextInterceptor.invoke(new MethodInvocationImpl(args,
thisMethod, self, interceptors, 0, proceed, null));
}
finally {
if (DEBUG_INTERCEPTION) {
aggregateInterceptionTime = System.currentTimeMillis() - aggregateInterceptionTime;
Logger.getLogger().debug("Interceptor " + nextInterceptor.getClass().getName() +
" index 0 took an aggregate of " + aggregateInterceptionTime + " milliseconds");
}
}
}
private class MethodInvocationImpl implements MethodInvocation, HK2Invocation {
private final Object[] arguments; // Live!
private final Method method;
private final Object myself;
private final List interceptors;
private final int index;
private final Method proceed;
private HashMap userData;
private MethodInvocationImpl(Object[] arguments,
Method method,
Object myself,
List interceptors,
int index,
Method proceed,
HashMap userData) {
this.arguments = arguments;
this.method = method;
this.myself = myself;
this.interceptors = interceptors;
this.index = index;
this.proceed = proceed;
this.userData = userData;
}
@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()) {
long methodTime = 0L;
if (DEBUG_INTERCEPTION) {
methodTime = System.currentTimeMillis();
}
try {
// Call the actual method
return ReflectionHelper.invoke(myself, proceed, arguments, locator.getNeutralContextClassLoader());
}
finally {
if (DEBUG_INTERCEPTION) {
methodTime = System.currentTimeMillis() - methodTime;
Logger.getLogger().debug("Time to call actual intercepted method " + method + " is " + methodTime + " milliseconds");
}
}
}
// Invoke the next interceptor
MethodInterceptor nextInterceptor = interceptors.get(newIndex);
long aggregateInterceptionTime = 0L;
if (DEBUG_INTERCEPTION) {
aggregateInterceptionTime = System.currentTimeMillis();
Logger.getLogger().debug("Invoking interceptor " + nextInterceptor.getClass().getName() +
" index " + newIndex + " in stack of " + interceptors.size() +
" of method " + method);
}
try {
return nextInterceptor.invoke(new MethodInvocationImpl(arguments,
method, myself, interceptors, newIndex, proceed, userData));
}
finally {
if (DEBUG_INTERCEPTION) {
aggregateInterceptionTime = System.currentTimeMillis() - aggregateInterceptionTime;
Logger.getLogger().debug("Interceptor " + nextInterceptor.getClass().getName() +
" index " + newIndex +
" took an aggregate of " + aggregateInterceptionTime + " milliseconds");
}
}
}
/* (non-Javadoc)
* @see org.glassfish.hk2.api.HK2Invocation#setUserData(java.lang.String, java.lang.Object)
*/
@Override
public void setUserData(String key, Object data) {
if (key == null) throw new IllegalArgumentException();
if (userData == null) userData = new HashMap();
if (data == null) {
userData.remove(key);
}
else {
userData.put(key, data);
}
}
/* (non-Javadoc)
* @see org.glassfish.hk2.api.HK2Invocation#getUserData(java.lang.String)
*/
@Override
public Object getUserData(String key) {
if (key == null) throw new IllegalArgumentException();
if (userData == null) return null;
return userData.get(key);
}
}
}
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