/*
* JBoss, Home of Professional Open Source
* Copyright 2010, Red Hat Middleware LLC, and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jboss.arquillian.impl.core;
import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.Stack;
import org.jboss.arquillian.impl.core.context.ApplicationContextImpl;
import org.jboss.arquillian.impl.core.spi.EventContext;
import org.jboss.arquillian.impl.core.spi.EventPoint;
import org.jboss.arquillian.impl.core.spi.Extension;
import org.jboss.arquillian.impl.core.spi.InjectionPoint;
import org.jboss.arquillian.impl.core.spi.InvocationException;
import org.jboss.arquillian.impl.core.spi.Manager;
import org.jboss.arquillian.impl.core.spi.NonManagedObserver;
import org.jboss.arquillian.impl.core.spi.ObserverMethod;
import org.jboss.arquillian.impl.core.spi.context.ApplicationContext;
import org.jboss.arquillian.impl.core.spi.context.Context;
import org.jboss.arquillian.spi.core.Injector;
import org.jboss.arquillian.spi.core.event.ManagerStarted;
/**
* ManagerImpl
*
* @author <a href="mailto:aslak@redhat.com">Aslak Knutsen</a>
* @version $Revision: $
*/
public class ManagerImpl implements Manager
{
//-------------------------------------------------------------------------------------||
// Instance Members -------------------------------------------------------------------||
//-------------------------------------------------------------------------------------||
public static Boolean DEBUG = false;
private ThreadLocal<Stack<Object>> eventStack;
/*
* Hack:
* Events can be fired nested. If a nested handler throws a exception, the exception is fired on the bus for handling.
* It is up to the exception handler to re-throw the exception if it can't handle it. When the re-throw happens
* the higher level event will get the exception and re-fire it on the bus. We need to keep track of which exceptions
* has been handled in the call chain so we can re-throw without re-firing on a higher level.
*/
private ThreadLocal<Set<Class<? extends Throwable>>> handledThrowables = new ThreadLocal<Set<Class<? extends Throwable>>>() {
@Override
protected Set<Class<? extends Throwable>> initialValue()
{
return new HashSet<Class<? extends Throwable>>();
}
};
private List<Context> contexts;
private List<Extension> extensions;
ManagerImpl(List<Class<? extends Context>> contextClasses, List<Class<?>> extensionClasses)
{
this.contexts = new ArrayList<Context>();
this.extensions = new ArrayList<Extension>();
try
{
List<Extension> createdExtensions = createExtensions(extensionClasses);
List<Context> createdContexts = createContexts(contextClasses);
createApplicationContextAndActivate();
this.contexts.addAll(createdContexts);
this.extensions.addAll(createdExtensions);
addContextsToApplicationScope();
fire(new ManagerStarted());
}
catch (Exception e)
{
throw new RuntimeException("Could not create and startup manager", e);
}
}
//-------------------------------------------------------------------------------------||
// Required Implementations - Manager -------------------------------------------------||
//-------------------------------------------------------------------------------------||
@Override
public void fire(Object event)
{
fire(event, null);
}
/* (non-Javadoc)
* @see org.jboss.arquillian.impl.core.spi.Manager#fire(java.lang.Object, org.jboss.arquillian.impl.core.spi.NonManagedObserver)
*/
@Override
public <T> void fire(T event, NonManagedObserver<T> nonManagedObserver)
{
Validate.notNull(event, "Event must be specified");
debug(event, true);
// we start fresh pr new event
handledThrowables.get().clear();
List<ObserverMethod> observers = resolveObservers(event.getClass());
List<ObserverMethod> interceptorObservers = resolveInterceptorObservers(event.getClass());
try
{
new EventContextImpl<T>(this, interceptorObservers, observers, nonManagedObserver, event).proceed();
}
catch (Exception e)
{
Throwable fireException = e;
if(fireException instanceof InvocationException)
{
fireException = fireException.getCause();
}
if(handledThrowables.get().contains(fireException.getClass()))
{
UncheckedThrow.throwUnchecked(fireException);
}
else
{
fireException(fireException);
}
}
finally
{
debug(event, false);
}
}
@Override
public <T> void bind(Class<? extends Annotation> scope, Class<T> type, T instance)
{
Validate.notNull(scope, "Scope must be specified");
Validate.notNull(type, "Type must be specified");
Validate.notNull(instance, "Instance must be specified");
Context scopedContext = getScopedContext(scope);
if(scopedContext == null)
{
throw new IllegalArgumentException("No Context registered with support for scope: " + scope);
}
if(!scopedContext.isActive())
{
throw new IllegalArgumentException("No active " + scope.getSimpleName() + " Context to bind to");
}
scopedContext.getObjectStore().add(type, instance);
}
@Override
public <T> T resolve(Class<T> type)
{
Validate.notNull(type, "Type must be specified");
List<Context> activeContexts = resolveActiveContexts();
for(int i = activeContexts.size() -1; i >= 0; i--)
{
Context context = activeContexts.get(i);
T object = context.getObjectStore().get(type);
if(object != null)
{
return object;
}
}
return null;
}
@Override
public void inject(Object obj)
{
inject(ExtensionImpl.of(obj));
}
/* (non-Javadoc)
* @see org.jboss.arquillian.spi.Manager#getContext(java.lang.Class)
*/
@Override
public <T> T getContext(Class<T> type)
{
for(Context context : contexts)
{
if(type.isInstance(context))
{
return type.cast(context);
}
}
return null;
}
//-------------------------------------------------------------------------------------||
// Exposed Convenience Impl Methods ---------------------------------------------------||
//-------------------------------------------------------------------------------------||
/**
* @param <T>
* @param scope
* @param type
* @param instance
*/
public <T> void bindAndFire(Class<? extends Annotation> scope, Class<T> type, T instance)
{
bind(scope, type, instance);
fire(instance);
}
/**
* @return the extensions
*/
public <T> T getExtension(Class<T> type)
{
for(Extension extension : extensions)
{
Object target = ((ExtensionImpl)extension).getTarget();
if(type.isInstance(target))
{
return type.cast(target);
}
}
return null;
}
/* (non-Javadoc)
* @see org.jboss.arquillian.core.spi.Manager#shutdown()
*/
@Override
public void shutdown()
{
synchronized (this)
{
for(Context context : contexts)
{
context.clearAll();
}
contexts.clear();
extensions.clear();
if(eventStack != null)
{
eventStack.remove();
}
handledThrowables.remove();
}
}
//-------------------------------------------------------------------------------------||
// Internal Helper Methods ------------------------------------------------------------||
//-------------------------------------------------------------------------------------||
boolean isExceptionHandled(Throwable e)
{
return handledThrowables.get().contains(e.getClass());
}
void fireException(Throwable event)
{
debug(event, true);
try
{
List<ObserverMethod> observers = resolveObservers(event.getClass());
if(observers.size() == 0) // no one is handling this Exception, throw it out.
{
UncheckedThrow.throwUnchecked(event);
}
for(int i = 0; i < observers.size(); i++)
{
ObserverMethod observer = observers.get(i);
try
{
debug(observer, false);
observer.invoke(this, event);
}
catch (Exception e)
{
// getCause(InocationTargetException).getCause(RealCause);
Throwable toBeFired = e.getCause();
// same type of exception being fired as caught and is the last observer, throw to avoid loop
if(toBeFired.getClass() == event.getClass())
{
// on throw if this is the last Exception observer
if(i == observers.size()-1)
{
handledThrowables.get().add(toBeFired.getClass());
// this will throw checked exception if any, and will break the declaration of fire(), will throw the original cause
UncheckedThrow.throwUnchecked(toBeFired);
}
}
else
{
// a new exception was raised, throw
fireException(toBeFired);
}
}
}
}
finally
{
debug(event, false);
}
}
/**
* @param extensions
* @return
*/
private List<Extension> createExtensions(List<Class<?>> extensionClasses) throws Exception
{
List<Extension> created = new ArrayList<Extension>();
for(Class<?> extensionClass : extensionClasses)
{
Extension extension = ExtensionImpl.of(Reflections.createInstance(extensionClass));
inject(extension);
created.add(extension);
}
return created;
}
/**
* @param contexts2
* @return
*/
private List<Context> createContexts(List<Class<? extends Context>> contextClasses) throws Exception
{
List<Context> created = new ArrayList<Context>();
for(Class<? extends Context> contextClass : contextClasses)
{
created.add(Reflections.createInstance(contextClass));
}
return created;
}
/**
*
*/
private void createApplicationContextAndActivate()
{
ApplicationContext context = new ApplicationContextImpl();
context.activate();
context.getObjectStore().add(Injector.class, InjectorImpl.of(this));
contexts.add(context);
}
/**
* @param objectStore
*/
@SuppressWarnings("unchecked")
private void addContextsToApplicationScope()
{
ApplicationContext appContext = getContext(ApplicationContext.class);
ObjectStore store = appContext.getObjectStore();
for(Context context : contexts)
{
store.add((Class<Context>)context.getClass().getInterfaces()[0], context);
}
}
/**
* @param eventType
* @return
*/
private List<ObserverMethod> resolveObservers(Class<?> eventType)
{
List<ObserverMethod> observers = new ArrayList<ObserverMethod>();
for(Extension extension : extensions)
{
for(ObserverMethod observer : extension.getObservers())
{
if(Reflections.getType(observer.getType()).isAssignableFrom(eventType) && !Reflections.isType(observer.getType(), EventContext.class))
{
observers.add(observer);
}
}
}
Collections.sort(observers);
return observers;
}
private List<ObserverMethod> resolveInterceptorObservers(Class<?> eventType)
{
List<ObserverMethod> observers = new ArrayList<ObserverMethod>();
for(Extension extension : extensions)
{
for(ObserverMethod observer : extension.getObservers())
{
if(Reflections.isType(observer.getType(), EventContext.class))
{
if(Reflections.getType(observer.getType()).isAssignableFrom(eventType))
{
observers.add(observer);
}
}
}
}
Collections.sort(observers);
return observers;
}
private List<Context> resolveActiveContexts()
{
List<Context> activeContexts = new ArrayList<Context>();
for(Context context : contexts)
{
if(context.isActive())
{
activeContexts.add(context);
}
}
return activeContexts;
}
private void inject(Extension extension)
{
injectInstances(extension);
injectEvents(extension);
}
/**
* @param extension
*/
private void injectInstances(Extension extension)
{
for(InjectionPoint point : extension.getInjectionPoints())
{
point.set(InstanceImpl.of(Reflections.getType(point.getType()), point.getScope(), this));
}
}
/**
* @param extension
*/
private void injectEvents(Extension extension)
{
for(EventPoint point : extension.getEventPoints())
{
point.set(EventImpl.of(Reflections.getType(point.getType()), this));
}
}
private Context getScopedContext(Class<? extends Annotation> scope)
{
for(Context context : contexts)
{
if(context.getScope() == scope)
{
return context;
}
}
return null;
}
void debug(ObserverMethod method, boolean interceptor)
{
if(DEBUG)
{
System.out.println(calcDebugPrefix() + "(" + (interceptor ? "I":"O") + ") " +method.getMethod().getDeclaringClass().getSimpleName() + "." + method.getMethod().getName());
}
}
private void debug(Object event, boolean push)
{
if(DEBUG)
{
if(eventStack == null)
{
eventStack = new ThreadLocal<Stack<Object>>()
{
@Override
protected Stack<Object> initialValue()
{
return new Stack<Object>();
}
};
}
if(push)
{
System.out.println(calcDebugPrefix() + "(E) " + event.getClass().getSimpleName());
eventStack.get().push(event);
}
else
{
if(!eventStack.get().isEmpty())
{
eventStack.get().pop();
}
}
}
}
private String calcDebugPrefix()
{
int size = eventStack.get().size();
StringBuilder sb = new StringBuilder();
for(int i = 0; i < size; i++)
{
sb.append("\t");
}
return sb.toString();
}
}