/*
* TeleStax, Open Source Cloud Communications Copyright 2012.
* and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.mobicents.protocols.ss7.m3ua.impl;
import javolution.util.FastList;
import org.apache.log4j.Logger;
import org.mobicents.protocols.ss7.m3ua.Asp;
import org.mobicents.protocols.ss7.m3ua.Functionality;
import org.mobicents.protocols.ss7.m3ua.impl.fsm.FSM;
import org.mobicents.protocols.ss7.m3ua.impl.fsm.FSMState;
import org.mobicents.protocols.ss7.m3ua.impl.fsm.TransitionHandler;
import org.mobicents.protocols.ss7.m3ua.message.MessageClass;
import org.mobicents.protocols.ss7.m3ua.message.MessageType;
import org.mobicents.protocols.ss7.m3ua.message.mgmt.Notify;
import org.mobicents.protocols.ss7.m3ua.parameter.Status;
import org.mobicents.protocols.ss7.m3ua.parameter.TrafficModeType;
/**
* <p>
* Transitions the {@link RemAsImpl} from {@link AsState.ACTIVE} to {@link AsState.PENDING}. The transition depends on
* {@link TrafficModeType} defined for this {@link RemAsImpl} and {@link AspState} of enclosed {@link RemAsImpl}
* </p>
*
*
* <ul>
*
* <li>
* <p>
* If the {@link TrafficModeType} for this {@link RemAsImpl} is Loadshare and there are {@link RemAsImpl} that are still
* {@link AspState.ACTIVE}, {@link RemAsImpl} remains {@link AsState.ACTIVE}. If number of {@link RemAsImpl} in
* {@link AspState.ACTIVE} is greater than minimum Asp required for load balancing, it just returns false and transition doesn't
* happen. However if number of {@link RemAsImpl} in {@link AspState.ACTIVE} is less than minimum Asp required for load
* balancing, it sends {@link Status.INFO_Insufficient_ASP_Resources_Active} {@link Notify} to remote ASP who are
* {@link AspState.INACTIVE} and transition doesn't happen.
* </p>
*
* <p>
* If there are no {@link RemAsImpl} in {@link AspState.ACTIVE}, it transitions to {@link AsState.PENDIING} and sends
* {@link Status.INFO_AS_PENDING} {@link Notify} to remote ASP who are {@link AspState.INACTIVE}.
* </p>
* </li>
*
* <li>
* <p>
* If the {@link TrafficModeType} for this {@link RemAsImpl} is Override it transitions to {@link AsState.PENDIING} and sends
* {@link Status.INFO_AS_PENDING} {@link Notify} to remote ASP who are {@link AspState.INACTIVE}.
* </p>
* </li>
*
* </ul>
*
* @author amit bhayani
*
*/
public class THLocalAsActToPendRemAspInac implements TransitionHandler {
private static final Logger logger = Logger.getLogger(THLocalAsActToPendRemAspInac.class);
private AsImpl asImpl = null;
private FSM fsm;
private int lbCount = 0;
public THLocalAsActToPendRemAspInac(AsImpl asImpl, FSM fsm) {
this.asImpl = asImpl;
this.fsm = fsm;
}
public boolean process(FSMState state) {
try {
AspImpl remAsp = (AspImpl) this.fsm.getAttribute(AsImpl.ATTRIBUTE_ASP);
if (this.asImpl.getTrafficModeType().getMode() == TrafficModeType.Broadcast) {
// We don't support this
return false;
}
if (this.asImpl.getTrafficModeType().getMode() == TrafficModeType.Loadshare) {
this.lbCount = 0;
for (FastList.Node<Asp> n = this.asImpl.appServerProcs.head(), end = this.asImpl.appServerProcs.tail(); (n = n
.getNext()) != end;) {
AspImpl remAspImpl = (AspImpl) n.getValue();
FSM aspPeerFSM = remAspImpl.getPeerFSM();
AspState aspState = AspState.getState(aspPeerFSM.getState().getName());
if (aspState == AspState.ACTIVE) {
this.lbCount++;
}
}// for
if (this.lbCount >= this.asImpl.getMinAspActiveForLb()) {
// we still have more ASP's ACTIVE for lb. Don't change
// state
return false;
}
// We are below minAspActiveForLb required for LB
if (this.lbCount > 0) {
// But In any case if we have at least one ASP that can take
// care of traffic, don't change state but send the "Ins.
// ASPs" to INACTIVE ASP's
if (asImpl.getFunctionality() != Functionality.IPSP) {
// In any case send Notify only for ASP or SGW
for (FastList.Node<Asp> n = this.asImpl.appServerProcs.head(), end = this.asImpl.appServerProcs.tail(); (n = n
.getNext()) != end;) {
remAsp = (AspImpl) n.getValue();
FSM aspPeerFSM = remAsp.getPeerFSM();
AspState aspState = AspState.getState(aspPeerFSM.getState().getName());
if (aspState == AspState.INACTIVE) {
Notify notify = this.createNotify(remAsp, Status.STATUS_Other,
Status.INFO_Insufficient_ASP_Resources_Active);
remAsp.getAspFactory().write(notify);
}
}
}
return false;
}
}// If Loadshare
// We have reached here means AS is transitioning to be PENDING.
// Send new AS STATUS to all INACTIVE APS's
if (asImpl.getFunctionality() != Functionality.IPSP) {
// Send Notify only for ASP or SGW
for (FastList.Node<Asp> n = this.asImpl.appServerProcs.head(), end = this.asImpl.appServerProcs.tail(); (n = n
.getNext()) != end;) {
remAsp = (AspImpl) n.getValue();
FSM aspPeerFSM = remAsp.getPeerFSM();
AspState aspState = AspState.getState(aspPeerFSM.getState().getName());
if (aspState == AspState.INACTIVE) {
Notify notify = this.createNotify(remAsp, Status.STATUS_AS_State_Change, Status.INFO_AS_PENDING);
remAsp.getAspFactory().write(notify);
}
}
}
} catch (Exception e) {
logger.error(String.format("Error while translating Rem AS to PENDING. %s", this.fsm.toString()), e);
}
return true;
}
private Notify createNotify(AspImpl remAsp, int type, int info) {
Notify msg = (Notify) this.asImpl.getMessageFactory().createMessage(MessageClass.MANAGEMENT, MessageType.NOTIFY);
Status status = this.asImpl.getParameterFactory().createStatus(type, info);
msg.setStatus(status);
if (remAsp.getASPIdentifier() != null) {
msg.setASPIdentifier(remAsp.getASPIdentifier());
}
if (this.asImpl.getRoutingContext() != null) {
msg.setRoutingContext(this.asImpl.getRoutingContext());
}
return msg;
}
}