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Default implementations for HK2 services
/*
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*
* Copyright (c) 2014-2015 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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* language governing permissions and limitations under the License.
*
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* file and include the License file at packager/legal/LICENSE.txt.
*
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package org.glassfish.hk2.extras.interception.internal;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import javax.inject.Inject;
import javax.inject.Singleton;
import org.aopalliance.intercept.ConstructorInterceptor;
import org.aopalliance.intercept.MethodInterceptor;
import org.glassfish.hk2.api.ActiveDescriptor;
import org.glassfish.hk2.api.Descriptor;
import org.glassfish.hk2.api.DescriptorVisibility;
import org.glassfish.hk2.api.Filter;
import org.glassfish.hk2.api.IndexedFilter;
import org.glassfish.hk2.api.InterceptionService;
import org.glassfish.hk2.api.IterableProvider;
import org.glassfish.hk2.api.ServiceHandle;
import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.hk2.api.Visibility;
import org.glassfish.hk2.extras.interception.Intercepted;
import org.glassfish.hk2.extras.interception.Interceptor;
import org.glassfish.hk2.extras.interception.InterceptorOrderingService;
/**
* A default implementation of the interception service using annotation to
* denote services that are to be intercepted and other annotations to match
* methods or constructors to interceptors
*
* @author jwells
*/
@Singleton
@Visibility(DescriptorVisibility.LOCAL)
public class DefaultInterceptionService implements InterceptionService {
private final static IndexedFilter METHOD_FILTER = new IndexedFilter() {
@Override
public boolean matches(Descriptor d) {
return d.getQualifiers().contains(Interceptor.class.getName());
}
@Override
public String getAdvertisedContract() {
return MethodInterceptor.class.getName();
}
@Override
public String getName() {
return null;
}
};
private final static IndexedFilter CONSTRUCTOR_FILTER = new IndexedFilter() {
@Override
public boolean matches(Descriptor d) {
return d.getQualifiers().contains(Interceptor.class.getName());
}
@Override
public String getAdvertisedContract() {
return ConstructorInterceptor.class.getName();
}
@Override
public String getName() {
return null;
}
};
@Inject
private ServiceLocator locator;
@Inject
private IterableProvider orderers;
/* (non-Javadoc)
* @see org.glassfish.hk2.api.InterceptionService#getDescriptorFilter()
*/
@Override
public Filter getDescriptorFilter() {
return new Filter() {
@Override
public boolean matches(Descriptor d) {
return d.getQualifiers().contains(Intercepted.class.getName());
}
};
}
private List> orderMethods(Method method, List> current) {
List> retVal = current;
for (InterceptorOrderingService orderer : orderers) {
List> given = Collections.unmodifiableList(retVal);
List> returned;
try {
returned = orderer.modifyMethodInterceptors(method, given);
}
catch (Throwable th) {
returned = null;
}
if (returned != null && returned != given) {
retVal = new ArrayList>(returned);
}
}
return retVal;
}
private List> orderConstructors(Constructor constructor, List> current) {
List> retVal = current;
for (InterceptorOrderingService orderer : orderers) {
List> given = Collections.unmodifiableList(retVal);
List> returned;
try {
returned = orderer.modifyConstructorInterceptors(constructor, given);
}
catch (Throwable th) {
returned = null;
}
if (returned != null && returned != given) {
retVal = new ArrayList>(returned);
}
}
return retVal;
}
/* (non-Javadoc)
* @see org.glassfish.hk2.api.InterceptionService#getMethodInterceptors(java.lang.reflect.Method)
*/
@SuppressWarnings("unchecked")
@Override
public List getMethodInterceptors(Method method) {
HashSet allBindings = ReflectionUtilities.getAllBindingsFromMethod(method);
List> allInterceptors = locator.getAllServiceHandles(METHOD_FILTER);
List> handles = new ArrayList>(allInterceptors.size());
for (ServiceHandle handle : allInterceptors) {
ActiveDescriptor ad = handle.getActiveDescriptor();
if (!ad.isReified()) {
ad = locator.reifyDescriptor(ad);
}
Class interceptorClass = ad.getImplementationClass();
HashSet allInterceptorBindings = ReflectionUtilities.getAllBindingsFromClass(interceptorClass);
boolean found = false;
for (String interceptorBinding : allInterceptorBindings) {
if (allBindings.contains(interceptorBinding)) {
found = true;
break;
}
}
if (!found) continue;
ServiceHandle interceptor = (ServiceHandle) handle;
if (interceptor != null) {
handles.add(interceptor);
}
}
handles = orderMethods(method, handles);
if (handles.isEmpty()) return Collections.emptyList();
List retVal = new ArrayList(handles.size());
for (ServiceHandle handle : handles) {
MethodInterceptor interceptor = handle.getService();
if (interceptor == null) continue;
retVal.add(interceptor);
}
return retVal;
}
/* (non-Javadoc)
* @see org.glassfish.hk2.api.InterceptionService#getConstructorInterceptors(java.lang.reflect.Constructor)
*/
@SuppressWarnings("unchecked")
@Override
public List getConstructorInterceptors(
Constructor constructor) {
HashSet allBindings = ReflectionUtilities.getAllBindingsFromConstructor(constructor);
List> allInterceptors = locator.getAllServiceHandles(CONSTRUCTOR_FILTER);
List> handles = new ArrayList>(allInterceptors.size());
for (ServiceHandle handle : allInterceptors) {
ActiveDescriptor ad = handle.getActiveDescriptor();
if (!ad.isReified()) {
ad = locator.reifyDescriptor(ad);
}
Class interceptorClass = ad.getImplementationClass();
HashSet allInterceptorBindings = ReflectionUtilities.getAllBindingsFromClass(interceptorClass);
boolean found = false;
for (String interceptorBinding : allInterceptorBindings) {
if (allBindings.contains(interceptorBinding)) {
found = true;
break;
}
}
if (!found) continue;
ServiceHandle interceptor = (ServiceHandle) handle;
if (interceptor != null) {
handles.add(interceptor);
}
}
handles = orderConstructors(constructor, handles);
if (handles.isEmpty()) return Collections.emptyList();
List retVal = new ArrayList(handles.size());
for (ServiceHandle handle : handles) {
ConstructorInterceptor interceptor = handle.getService();
if (interceptor == null) continue;
retVal.add(interceptor);
}
return retVal;
}
}
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