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package com.c2kernel.entity;
import java.util.Map;
import org.omg.PortableServer.POA;
import org.omg.PortableServer.POAManager;
import org.omg.PortableServer.Servant;
import org.omg.PortableServer.POAManagerPackage.AdapterInactive;
import com.c2kernel.common.CannotManageException;
import com.c2kernel.common.InvalidDataException;
import com.c2kernel.common.ObjectAlreadyExistsException;
import com.c2kernel.common.ObjectNotFoundException;
import com.c2kernel.entity.agent.ActiveEntity;
import com.c2kernel.entity.agent.ActiveLocator;
import com.c2kernel.lookup.AgentPath;
import com.c2kernel.lookup.ItemPath;
import com.c2kernel.lookup.InvalidItemPathException;
import com.c2kernel.process.Gateway;
import com.c2kernel.utils.Logger;
import com.c2kernel.utils.SoftCache;
/**************************************************************************
*
* $Revision: 1.8 $
* $Date: 2005/10/13 08:13:44 $
*
* Copyright (C) 2003 CERN - European Organization for Nuclear Research
* All rights reserved.
**************************************************************************/
public class CorbaServer {
private final Map<ItemPath, Servant> mEntityCache;
private POA mRootPOA;
private POA mItemPOA;
private POA mAgentPOA;
private POAManager mPOAManager;
public CorbaServer() throws InvalidDataException {
mEntityCache = new SoftCache<ItemPath, Servant>(50);
// init POA
try {
setupPOA();
mPOAManager.activate();
} catch (Exception ex) {
Logger.error(ex);
throw new InvalidDataException("Error initialising POA", "");
}
new Thread(new Runnable() {
@Override
public void run() {
Thread.currentThread().setName("ORB Invoker");
Gateway.getORB().run();
}
}).start();
}
public void close() {
try {
mPOAManager.deactivate(true, true);
} catch (AdapterInactive ex) {
Logger.error(ex);
}
}
/**************************************************************************
* Initialises the C2KRootPOA with policies which are suitable for Factory objects
**************************************************************************/
public void setupPOA() throws Exception {
//Initialise the RootPOA
mRootPOA = org.omg.PortableServer.POAHelper.narrow(
Gateway.getORB().resolve_initial_references("RootPOA"));
//Initilaise the default POAManager
mPOAManager = mRootPOA.the_POAManager();
// Create POA for use by the entities
org.omg.CORBA.Policy[] policies = new org.omg.CORBA.Policy[6];
policies[0] = mRootPOA.create_id_assignment_policy(
org.omg.PortableServer.IdAssignmentPolicyValue.USER_ID);
policies[1] = mRootPOA.create_lifespan_policy(
org.omg.PortableServer.LifespanPolicyValue.PERSISTENT);
policies[2] = mRootPOA.create_servant_retention_policy(
org.omg.PortableServer.ServantRetentionPolicyValue.NON_RETAIN);
policies[3] = mRootPOA.create_id_uniqueness_policy(
org.omg.PortableServer.IdUniquenessPolicyValue.UNIQUE_ID);
policies[4] = mRootPOA.create_request_processing_policy(
org.omg.PortableServer.RequestProcessingPolicyValue.
USE_SERVANT_MANAGER);
policies[5] = mRootPOA.create_implicit_activation_policy(
org.omg.PortableServer.ImplicitActivationPolicyValue.
NO_IMPLICIT_ACTIVATION);
mItemPOA = mRootPOA.create_POA( "Item",
mRootPOA.the_POAManager(),
policies );
mAgentPOA = mRootPOA.create_POA( "Agent",
mRootPOA.the_POAManager(),
policies );
//Create the locators
TraceableLocator itemLocator = new TraceableLocator();
mItemPOA.set_servant_manager( itemLocator._this( Gateway.getORB() ) );
ActiveLocator agentLocator = new ActiveLocator();
mAgentPOA.set_servant_manager( agentLocator._this( Gateway.getORB() ) );
}
/**************************************************************************
* Returns a CORBA servant for a pre-existing entity
**************************************************************************/
private Servant getEntity(int sysKey, org.omg.PortableServer.POA poa) throws ObjectNotFoundException {
try {
ItemPath entityPath = new ItemPath(sysKey);
Servant entity = null;
synchronized (mEntityCache) {
entity = mEntityCache.get(entityPath);
if (entity == null) {
Logger.msg(7, "Creating new servant for "+sysKey);
Class<?> entityClass = Gateway.getLDAPLookup().getEntityClass(entityPath);
if (entityClass == TraceableEntity.class) {
if (poa == null) poa = mItemPOA;
entity = new TraceableEntity(sysKey, poa);
}
else if (entityClass == ActiveEntity.class) {
if (poa == null) poa = mAgentPOA;
entity = new ActiveEntity(sysKey, poa);
}
mEntityCache.put(entityPath, entity);
}
}
return entity;
} catch (InvalidItemPathException ex) {
throw new ObjectNotFoundException("Invalid Entity Key", "");
}
}
/**************************************************************************
* Wrapper for fetching Items
**************************************************************************/
public TraceableEntity getItem(int sysKey) throws ObjectNotFoundException {
return (TraceableEntity)getEntity(sysKey, mItemPOA);
}
/**************************************************************************
* Wrapper for fetching Agents
**************************************************************************/
public ActiveEntity getAgent(int sysKey) throws ObjectNotFoundException {
return (ActiveEntity)getEntity(sysKey, mAgentPOA);
}
/**
* @param entityPath
* @return
*/
public Servant createEntity(ItemPath entityPath) throws CannotManageException, ObjectAlreadyExistsException {
try {
if (entityPath == null)
entityPath = Gateway.getLDAPLookup().getNextKeyManager().generateNextEntityKey();
} catch (Exception ex) {
Logger.error(ex);
throw new CannotManageException("Cannot generate next entity key");
}
boolean isAgent = entityPath instanceof AgentPath;
POA myPOA = isAgent?mAgentPOA:mItemPOA;
org.omg.CORBA.Object obj = myPOA.create_reference_with_id(entityPath.getOID(), isAgent?AgentHelper.id():ItemHelper.id());
entityPath.setIOR(obj);
Servant entity;
if (isAgent)
entity = new ActiveEntity(entityPath.getSysKey(), myPOA);
else
entity = new TraceableEntity(entityPath.getSysKey(), myPOA);
synchronized (mEntityCache) {
mEntityCache.put(entityPath, entity);
}
return entity;
}
}
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