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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
*
* Use is subject to license terms.
*
* JBoss, Home of Professional Open Source
* Copyright 2008, Red Hat, Inc., 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.weld.context;
import static org.jboss.weld.context.conversation.ConversationIdGenerator.CONVERSATION_ID_GENERATOR_ATTRIBUTE_NAME;
import static org.jboss.weld.logging.messages.ConversationMessage.NO_CONVERSATION_FOUND_TO_RESTORE;
import static org.jboss.weld.util.reflection.Reflections.cast;
import java.lang.annotation.Annotation;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import javax.enterprise.context.ConversationScoped;
import javax.enterprise.inject.Instance;
import org.jboss.weld.Container;
import org.jboss.weld.context.beanstore.BoundBeanStore;
import org.jboss.weld.context.beanstore.ConversationNamingScheme;
import org.jboss.weld.context.beanstore.NamingScheme;
import org.jboss.weld.context.conversation.ConversationIdGenerator;
import org.jboss.weld.context.conversation.ConversationImpl;
import org.jboss.weld.logging.messages.ConversationMessage;
/**
* The base of the conversation context, which can use a variety of storage
* forms
*
* @author Pete Muir
* @author George Sapountzis
*/
public abstract class AbstractConversationContext extends AbstractBoundContext implements ConversationContext {
private static final String CURRENT_CONVERSATION_ATTRIBUTE_NAME = ConversationContext.class.getName() + ".currentConversation";
public static final String CONVERSATIONS_ATTRIBUTE_NAME = ConversationContext.class.getName() + ".conversations";
private static final long DEFAULT_TIMEOUT = 10 * 60 * 1000L;
private static final long CONCURRENT_ACCESS_TIMEOUT = 1000L;
private static final String PARAMETER_NAME = "cid";
private final AtomicReference parameterName;
private final AtomicLong defaultTimeout;
private final AtomicLong concurrentAccessTimeout;
private final ThreadLocal associated;
private final Instance conversationContexts;
public AbstractConversationContext() {
super(true);
this.parameterName = new AtomicReference(PARAMETER_NAME);
this.defaultTimeout = new AtomicLong(DEFAULT_TIMEOUT);
this.concurrentAccessTimeout = new AtomicLong(CONCURRENT_ACCESS_TIMEOUT);
this.associated = new ThreadLocal();
this.conversationContexts = Container.instance().deploymentManager().instance().select(ConversationContext.class);
}
public String getParameterName() {
return parameterName.get();
}
public void setParameterName(String cid) {
this.parameterName.set(cid);
}
public void setConcurrentAccessTimeout(long timeout) {
this.concurrentAccessTimeout.set(timeout);
}
public long getConcurrentAccessTimeout() {
return concurrentAccessTimeout.get();
}
public void setDefaultTimeout(long timeout) {
this.defaultTimeout.set(timeout);
}
public long getDefaultTimeout() {
return defaultTimeout.get();
}
public boolean associate(R request) {
if (this.associated.get() == null) {
this.associated.set(request);
/*
* We need to delay attaching the bean store until activate() is called
* so that we can attach the correct conversation id
*/
/*
* We may need access to the conversation id generator and
* conversations. If the session already exists, we can load it from
* there, otherwise we can create a new conversation id generator and
* conversations collection. If the the session exists when the request
* is dissociated, then we store them in the session then.
*
* We always store the generator and conversation map in the request
* for temporary usage.
*/
if (getSessionAttribute(request, CONVERSATION_ID_GENERATOR_ATTRIBUTE_NAME, false) == null) {
ConversationIdGenerator generator = new ConversationIdGenerator();
setRequestAttribute(request, CONVERSATION_ID_GENERATOR_ATTRIBUTE_NAME, generator);
setSessionAttribute(request, CONVERSATION_ID_GENERATOR_ATTRIBUTE_NAME, generator, false);
} else {
setRequestAttribute(request, CONVERSATION_ID_GENERATOR_ATTRIBUTE_NAME, getSessionAttribute(request, CONVERSATION_ID_GENERATOR_ATTRIBUTE_NAME, true));
}
if (getSessionAttribute(request, CONVERSATIONS_ATTRIBUTE_NAME, false) == null) {
Map conversations = new HashMap();
setRequestAttribute(request, CONVERSATIONS_ATTRIBUTE_NAME, conversations);
setSessionAttribute(request, CONVERSATIONS_ATTRIBUTE_NAME, conversations, false);
} else {
setRequestAttribute(request, CONVERSATIONS_ATTRIBUTE_NAME, getSessionAttribute(request, CONVERSATIONS_ATTRIBUTE_NAME, true));
}
return true;
} else {
return false;
}
}
public boolean dissociate(R request) {
if (isAssociated()) {
try {
/*
* If the session is available, store the conversation id generator and
* conversations if necessary.
*/
if (getSessionAttribute(request, CONVERSATION_ID_GENERATOR_ATTRIBUTE_NAME, false) == null) {
setSessionAttribute(request, CONVERSATION_ID_GENERATOR_ATTRIBUTE_NAME, getRequestAttribute(request, CONVERSATION_ID_GENERATOR_ATTRIBUTE_NAME), false);
}
if (getSessionAttribute(request, CONVERSATIONS_ATTRIBUTE_NAME, false) == null) {
setSessionAttribute(request, CONVERSATIONS_ATTRIBUTE_NAME, getRequestAttribute(request, CONVERSATIONS_ATTRIBUTE_NAME), false);
}
this.associated.set(null);
return true;
} finally {
cleanup();
}
} else {
return false;
}
}
@Override
public void activate() {
this.activate(null);
}
protected void associateRequest() {
ManagedConversation conversation = new ConversationImpl(conversationContexts);
setRequestAttribute(getRequest(), CURRENT_CONVERSATION_ATTRIBUTE_NAME, conversation);
// Set a temporary bean store, this will be attached at the end of the request if needed
NamingScheme namingScheme = new ConversationNamingScheme(ConversationContext.class.getName(), "transient");
setBeanStore(createRequestBeanStore(namingScheme, getRequest()));
setRequestAttribute(getRequest(), ConversationNamingScheme.PARAMETER_NAME, namingScheme);
}
protected void associateRequest(String cid) {
ManagedConversation conversation = getConversation(cid);
setRequestAttribute(getRequest(), CURRENT_CONVERSATION_ATTRIBUTE_NAME, conversation);
NamingScheme namingScheme = new ConversationNamingScheme(ConversationContext.class.getName(), cid);
setBeanStore(createRequestBeanStore(namingScheme, getRequest()));
getBeanStore().attach();
}
public void activate(String cid) {
if (getBeanStore() == null) {
if (!isAssociated()) {
throw new IllegalStateException("Must call associate() before calling activate()");
}
// Activate the context
super.setActive(true);
// Attach the conversation
if (cid != null) {
ManagedConversation conversation = getConversation(cid);
if (conversation != null) {
boolean lock = conversation.lock(getConcurrentAccessTimeout());
if (lock) {
associateRequest(cid);
} else {
// Associate the request with a new transient conversation
associateRequest();
throw new BusyConversationException(ConversationMessage.CONVERSATION_LOCK_TIMEDOUT, cid);
}
} else {
// CDI 6.7.4 we must activate a new transient conversation before we throw the exception
associateRequest();
// Make sure that the conversation already exists
throw new NonexistentConversationException(NO_CONVERSATION_FOUND_TO_RESTORE, cid);
}
} else {
associateRequest();
}
} else {
throw new IllegalStateException("Context is already active");
}
}
@Override
public void deactivate() {
// Disassociate from the current conversation
if (getBeanStore() != null) {
if (!isAssociated()) {
throw new IllegalStateException("Must call associate() before calling deactivate()");
}
if (getCurrentConversation().isTransient()) {
destroy();
} else {
try {
// Update the conversation timestamp
getCurrentConversation().touch();
if (!getBeanStore().isAttached()) {
/*
* This was a transient conversation at the beginning of the
* request, so we need to update the CID it uses, and attach
* it. We also add it to the conversations the session knows
* about.
*/
if (!(getRequestAttribute(getRequest(), ConversationNamingScheme.PARAMETER_NAME) instanceof ConversationNamingScheme)) {
throw new IllegalStateException("Unable to find ConversationNamingScheme in the request, this conversation wasn't transient at the start of the request");
}
((ConversationNamingScheme) getRequestAttribute(getRequest(), ConversationNamingScheme.PARAMETER_NAME)).setCid(getCurrentConversation().getId());
getBeanStore().attach();
getConversationMap().put(getCurrentConversation().getId(), getCurrentConversation());
}
} finally {
getCurrentConversation().unlock();
}
}
setBeanStore(null);
// Clean up any expired conversations
Iterator> entryIterator = getConversationMap().entrySet().iterator();
while (entryIterator.hasNext()) {
Entry entry = entryIterator.next();
if (entry.getValue().isTransient()) {
destroyConversation(getSessionFromRequest(getRequest(), false), entry.getKey());
entryIterator.remove();
}
}
// deactivate the context
super.setActive(false);
} else {
throw new IllegalStateException("Context is not active");
}
}
@Override
public void invalidate() {
for (ManagedConversation conversation : getConversations()) {
if (isExpired(conversation)) {
if (!conversation.isTransient()) {
conversation.end();
}
}
}
}
public boolean destroy(S session) {
try {
// We are outside of request, destroy now
if (getSessionAttributeFromSession(session, CONVERSATIONS_ATTRIBUTE_NAME) instanceof Map) {
// There are no conversations to destroy
Map conversations = cast(getSessionAttributeFromSession(session, CONVERSATIONS_ATTRIBUTE_NAME));
// Set the context active
setActive(true);
for (ManagedConversation conversation : conversations.values()) {
String id = conversation.getId();
conversation.end();
destroyConversation(session, id);
}
setActive(false);
}
return true;
} finally {
cleanup();
}
}
protected void destroyConversation(S session, String id) {
if (session != null) {
// session can be null as we may have nothing in the session
setBeanStore(createSessionBeanStore(new ConversationNamingScheme(ConversationContext.class.getName(), id), session));
getBeanStore().attach();
destroy();
getBeanStore().detach();
setBeanStore(null);
}
}
public String generateConversationId() {
if (!isAssociated()) {
throw new IllegalStateException("A request must be associated with the context in order to generate a conversation id");
}
if (!(getRequestAttribute(getRequest(), CONVERSATION_ID_GENERATOR_ATTRIBUTE_NAME) instanceof ConversationIdGenerator)) {
throw new IllegalStateException("Unable to locate ConversationIdGenerator");
}
ConversationIdGenerator generator = (ConversationIdGenerator) getRequestAttribute(getRequest(), CONVERSATION_ID_GENERATOR_ATTRIBUTE_NAME);
return generator.call();
}
private static boolean isExpired(ManagedConversation conversation) {
return System.currentTimeMillis() > (conversation.getLastUsed() + conversation.getTimeout());
}
public ManagedConversation getConversation(String id) {
return getConversationMap().get(id);
}
public Collection getConversations() {
return getConversationMap().values();
}
private Map getConversationMap() {
if (!isAssociated()) {
throw new IllegalStateException("A request must be associated with the context in order to load the known conversations");
}
if (!(getRequestAttribute(getRequest(), CONVERSATIONS_ATTRIBUTE_NAME) instanceof Map)) {
throw new IllegalStateException("Unable to load current conversations from the associated request, something went badly wrong when associate() was called");
}
return cast(getRequestAttribute(getRequest(), CONVERSATIONS_ATTRIBUTE_NAME));
}
public ManagedConversation getCurrentConversation() {
if (!isAssociated()) {
throw new IllegalStateException("A request must be associated with the context in order to load the known conversations");
}
if (!(getRequestAttribute(getRequest(), CURRENT_CONVERSATION_ATTRIBUTE_NAME) instanceof ManagedConversation)) {
throw new IllegalStateException("Unable to load current conversations from the associated request, something went badly wrong when associate() was called");
}
return (ManagedConversation) getRequestAttribute(getRequest(), CURRENT_CONVERSATION_ATTRIBUTE_NAME);
}
public Class getScope() {
return ConversationScoped.class;
}
/**
* Set an attribute in the session.
*
* @param request the request to set the session attribute in
* @param name the name of the attribute
* @param value the value of the attribute
* @param create if false, the attribute will only be set if the session
* already exists, other wise it will always be set
* @throws IllegalStateException if create is true, and the session can't be
* created
*/
protected abstract void setSessionAttribute(R request, String name, Object value, boolean create);
/**
* Get an attribute value from the session.
*
* @param request the request to get the session attribute from
* @param name the name of the attribute
* @param create if false, the attribute will only be retrieved if the
* session already exists, other wise it will always be retrieved
* @return attribute
* @throws IllegalStateException if create is true, and the session can't be
* created
*/
protected abstract Object getSessionAttribute(R request, String name, boolean create);
/**
* Get an attribute value from the session.
*
* @param session the session to get the session attribute from
* @param name the name of the attribute
* @return attribute
* @throws IllegalStateException if create is true, and the session can't be
* created
*/
protected abstract Object getSessionAttributeFromSession(S session, String name);
/**
* Remove an attribute from the request.
*
* @param request the request to remove the attribute from
* @param name the name of the attribute
*/
protected abstract void removeRequestAttribute(R request, String name);
/**
* Set an attribute in the request.
*
* @param request the request to set the attribute from
* @param name the name of the attribute
* @param value the value of the attribute
*/
protected abstract void setRequestAttribute(R request, String name, Object value);
/**
* Retrieve an attribute value from the request
*
* @param request the request to get the attribute from
* @param name the name of the attribute to get
* @return the value of the attribute
*/
protected abstract Object getRequestAttribute(R request, String name);
protected abstract BoundBeanStore createRequestBeanStore(NamingScheme namingScheme, R request);
protected abstract BoundBeanStore createSessionBeanStore(NamingScheme namingScheme, S session);
protected abstract S getSessionFromRequest(R request, boolean create);
/**
* Check if the context is currently associated
*
* @return true if the context is associated
*/
private boolean isAssociated() {
return associated.get() != null;
}
/**
* Get the associated store
*
* @return the request
*/
private R getRequest() {
return associated.get();
}
}
