/*
* TeleStax, Open Source Cloud Communications
* Copyright 2011-2016, TeleStax Inc. and individual contributors
* by the @authors tag.
*
* This program is free software: you can redistribute it and/or modify
* under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*/
package org.jdiameter.server.impl.app.s13;
import org.jdiameter.api.Answer;
import org.jdiameter.api.EventListener;
import org.jdiameter.api.IllegalDiameterStateException;
import org.jdiameter.api.InternalException;
import org.jdiameter.api.NetworkReqListener;
import org.jdiameter.api.OverloadException;
import org.jdiameter.api.Request;
import org.jdiameter.api.RouteException;
import org.jdiameter.api.app.AppEvent;
import org.jdiameter.api.app.StateChangeListener;
import org.jdiameter.api.app.StateEvent;
import org.jdiameter.api.s13.ServerS13Session;
import org.jdiameter.api.s13.ServerS13SessionListener;
import org.jdiameter.api.s13.events.JMEIdentityCheckAnswer;
import org.jdiameter.api.s13.events.JMEIdentityCheckRequest;
import org.jdiameter.client.api.ISessionFactory;
import org.jdiameter.common.api.app.s13.IS13MessageFactory;
import org.jdiameter.common.api.app.s13.S13SessionState;
import org.jdiameter.common.impl.app.AppAnswerEventImpl;
import org.jdiameter.common.impl.app.AppRequestEventImpl;
import org.jdiameter.common.impl.app.s13.S13Session;
import org.jdiameter.server.impl.app.s13.Event.Type;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class S13ServerSessionImpl extends S13Session implements ServerS13Session, EventListener<Request, Answer>, NetworkReqListener {
private static final Logger logger = LoggerFactory.getLogger(S13ServerSessionImpl.class);
// Factories and Listeners
// --------------------------------------------------
private transient ServerS13SessionListener listener;
protected long appId = -1;
protected IServerS13SessionData sessionData;
public S13ServerSessionImpl(IServerS13SessionData sessionData, IS13MessageFactory fct, ISessionFactory sf, ServerS13SessionListener lst) {
super(sf, sessionData);
if (lst == null) {
throw new IllegalArgumentException("Listener can not be null");
}
if ((this.appId = fct.getApplicationId()) < 0) {
throw new IllegalArgumentException("ApplicationId can not be less than zero");
}
this.listener = lst;
super.messageFactory = fct;
this.sessionData = sessionData;
}
@Override
public void sendMEIdentityCheckAnswer(JMEIdentityCheckAnswer answer)
throws InternalException, IllegalDiameterStateException, RouteException, OverloadException {
send(Event.Type.SEND_MESSAGE, null, answer);
}
@Override
@SuppressWarnings("unchecked")
public <E> E getState(Class<E> stateType) {
return stateType == S13SessionState.class ? (E) this.sessionData.getS13SessionState() : null;
}
@Override
public boolean handleEvent(StateEvent event) throws InternalException, OverloadException {
try {
sendAndStateLock.lock();
if (!super.session.isValid()) {
// FIXME: throw new InternalException("Generic session is not valid.");
return false;
}
final S13SessionState state = this.sessionData.getS13SessionState();
S13SessionState newState = null;
Event localEvent = (Event) event;
Event.Type eventType = (Type) event.getType();
switch (state) {
case IDLE:
switch (eventType) {
case RECEIVE_ECR:
this.sessionData.setBuffer((Request) ((AppEvent) event.getData()).getMessage());
super.cancelMsgTimer();
super.startMsgTimer();
newState = S13SessionState.MESSAGE_SENT_RECEIVED;
setState(newState);
listener.doMEIdentityCheckRequestEvent(this,(JMEIdentityCheckRequest) event.getData());
break;
case SEND_MESSAGE:
super.session.send(((AppEvent) event.getData()).getMessage(), this);
newState = S13SessionState.MESSAGE_SENT_RECEIVED;
setState(newState);
break;
default:
logger.error("Wrong action in S13 Server FSM. State: IDLE, Event Type: {}", eventType);
break;
}
break;
case MESSAGE_SENT_RECEIVED:
switch (eventType) {
case TIMEOUT_EXPIRES:
newState = S13SessionState.TIMEDOUT;
setState(newState);
break;
case SEND_MESSAGE:
try {
super.session.send(((AppEvent) event.getData()).getMessage(), this);
} finally {
newState = S13SessionState.TERMINATED;
setState(newState);
}
break;
default:
throw new InternalException("Should not receive more messages after initial. Command: " + event.getData());
}
break;
case TERMINATED:
throw new InternalException("Cant receive message in state TERMINATED. Command: " + event.getData());
case TIMEDOUT:
throw new InternalException("Cant receive message in state TIMEDOUT. Command: " + event.getData());
default:
logger.error("S13 Server FSM in wrong state: {}", state);
break;
}
} catch (Exception e) {
throw new InternalException(e);
} finally {
sendAndStateLock.unlock();
}
return true;
}
@Override
public void receivedSuccessMessage(Request request, Answer answer) {
AnswerDelivery rd = new AnswerDelivery();
rd.session = this;
rd.request = request;
rd.answer = answer;
super.scheduler.execute(rd);
}
@Override
public void timeoutExpired(Request request) {
try {
handleEvent(new Event(Event.Type.TIMEOUT_EXPIRES, new AppRequestEventImpl(request), null));
} catch (Exception e) {
logger.debug("Failed to process timeout message", e);
}
}
@Override
public Answer processRequest(Request request) {
RequestDelivery rd = new RequestDelivery();
rd.session = this;
rd.request = request;
super.scheduler.execute(rd);
return null;
}
protected void send(Event.Type type, AppEvent request, AppEvent answer) throws InternalException {
try {
if (type != null) {
handleEvent(new Event(type, request, answer));
}
} catch (Exception e) {
throw new InternalException(e);
}
}
@SuppressWarnings("unchecked")
protected void setState(S13SessionState newState) {
S13SessionState oldState = this.sessionData.getS13SessionState();
this.sessionData.setS13SessionState(newState);
for (StateChangeListener i : stateListeners) {
i.stateChanged(this, oldState, newState);
}
if (newState == S13SessionState.TERMINATED || newState == S13SessionState.TIMEDOUT) {
super.cancelMsgTimer();
this.release();
}
}
@Override
public void onTimer(String timerName) {
if (timerName.equals(IDLE_SESSION_TIMER_NAME)) {
checkIdleAppSession();
}
else if (timerName.equals(S13Session.TIMER_NAME_MSG_TIMEOUT)) {
try {
sendAndStateLock.lock();
try {
handleEvent(new Event(Event.Type.TIMEOUT_EXPIRES, new AppRequestEventImpl(this.sessionData.getBuffer()), null));
} catch (Exception e) {
logger.debug("Failure handling Timeout event.");
}
this.sessionData.setBuffer(null);
this.sessionData.setTsTimerId(null);
} finally {
sendAndStateLock.unlock();
}
}
else {
logger.warn("Received an unknown timer '{}' for Session-ID '{}'", timerName, getSessionId());
}
}
@Override
public void release() {
if (isValid()) {
try {
sendAndStateLock.lock();
super.release();
} catch (Exception e) {
logger.debug("Failed to release session", e);
} finally {
sendAndStateLock.unlock();
}
} else {
logger.debug("Trying to release an already invalid session, with Session ID '{}'", getSessionId());
}
}
private class RequestDelivery implements Runnable {
ServerS13Session session;
Request request;
@Override
public void run() {
try {
switch (request.getCommandCode()) {
case JMEIdentityCheckRequest.code:
handleEvent(new Event(Event.Type.RECEIVE_ECR, messageFactory.createMEIdentityCheckRequest(request), null));
break;
default:
listener.doOtherEvent(session, new AppRequestEventImpl(request), null);
break;
}
} catch (Exception e) {
logger.debug("Failed to process request message", e);
}
}
}
private class AnswerDelivery implements Runnable {
ServerS13Session session;
Answer answer;
Request request;
@Override
public void run() {
try {
switch (answer.getCommandCode()) {
default:
listener.doOtherEvent(session, new AppRequestEventImpl(request), new AppAnswerEventImpl(answer));
break;
}
} catch (Exception e) {
logger.debug("Failed to process success message", e);
}
}
}
}