// **********************************************************************
//
// Copyright (c) 2003-2006 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************

package IceInternal;

public final class LocatorInfo
{
    LocatorInfo(Ice.LocatorPrx locator, LocatorTable table)
    {
	_locator = locator;
	_table = table;
    }

    synchronized public void
    destroy()
    {
	_locatorRegistry = null;
	_table.clear();
    }

    public boolean
    equals(java.lang.Object obj)
    {
	if(this == obj)
	{
	    return true;
	}

	if(obj instanceof LocatorInfo)
	{
	    return _locator.equals(((LocatorInfo)obj)._locator);
	}

	return false;
    }

    public Ice.LocatorPrx
    getLocator()
    {
	//
	// No synchronization necessary, _locator is immutable.
	//
	return _locator;
    }

    public synchronized Ice.LocatorRegistryPrx
    getLocatorRegistry()
    {
	if(_locatorRegistry == null) // Lazy initialization
	{
	    _locatorRegistry = _locator.getRegistry();

	    //
	    // The locator registry can't be located.
	    //
	    _locatorRegistry = Ice.LocatorRegistryPrxHelper.uncheckedCast(_locatorRegistry.ice_locator(null));
	}
	
	return _locatorRegistry;
    }

    public EndpointI[]
    getEndpoints(IndirectReference ref, int ttl, Ice.BooleanHolder cached)
    {
	EndpointI[] endpoints = null;
	Ice.ObjectPrx object = null;
	cached.value = true;
	String adapterId = ref.getAdapterId();
	Ice.Identity identity = ref.getIdentity();
	
	try
	{
	    if(adapterId.length() > 0)
	    {
		endpoints = _table.getAdapterEndpoints(adapterId, ttl);
		if(endpoints == null)
		{
		    cached.value = false;
		    
	            if(ref.getInstance().traceLevels().location >= 1)
	            {
		        StringBuffer s = new StringBuffer();
		        s.append("searching for adapter by id\n");
		        s.append("adapter = " + adapterId);
		        ref.getInstance().initializationData().logger.trace(
		            ref.getInstance().traceLevels().locationCat, s.toString());
	            }

		    //
		    // Search the adapter in the location service if we didn't
		    // find it in the cache.
		    //
		    object = _locator.findAdapterById(adapterId);
		    if(object != null)
		    {
			endpoints = ((Ice.ObjectPrxHelperBase)object).__reference().getEndpoints();
			
			if(endpoints.length > 0)
			{
			    _table.addAdapterEndpoints(adapterId, endpoints);
			}
		    }
		}
	    }
	    else
	    {
		boolean objectCached = true;
		object = _table.getProxy(identity, ttl);
		if(object == null)
		{
		    objectCached = false;

	            if(ref.getInstance().traceLevels().location >= 1)
	            {
		        StringBuffer s = new StringBuffer();
		        s.append("searching for object by id\n");
		        s.append("object = " + ref.getInstance().identityToString(identity));
		        ref.getInstance().initializationData().logger.trace(
		            ref.getInstance().traceLevels().locationCat, s.toString());
	            }

		    object = _locator.findObjectById(identity);
		}
		
		boolean endpointsCached = true;
		if(object != null)
		{
		    Reference r = ((Ice.ObjectPrxHelperBase)object).__reference();
		    if(r instanceof DirectReference)
		    {
			endpointsCached = false;
			DirectReference odr = (DirectReference)r;
			endpoints = odr.getEndpoints();
		    }
		    else
		    {
		        IndirectReference oir = (IndirectReference)r;
			if(oir.getAdapterId().length() > 0)
			{
			    Ice.BooleanHolder c = new Ice.BooleanHolder();
			    endpoints = getEndpoints(oir, ttl, c);
			    endpointsCached = c.value;
			}
		    }
		}
		
		if(!objectCached && endpoints != null && endpoints.length > 0)
		{
		    _table.addProxy(identity, object);
		}

		cached.value = objectCached || endpointsCached;
	    }
	}
	catch(Ice.AdapterNotFoundException ex)
	{
	    if(ref.getInstance().traceLevels().location >= 1)
	    {
	        StringBuffer s = new StringBuffer();
	        s.append("adapter not found\n");
	        s.append("adapter = " + adapterId);
	        ref.getInstance().initializationData().logger.trace(
	            ref.getInstance().traceLevels().locationCat, s.toString());
	    }

	    Ice.NotRegisteredException e = new Ice.NotRegisteredException();
	    e.kindOfObject = "object adapter";
	    e.id = adapterId;
	    throw e;
	}
	catch(Ice.ObjectNotFoundException ex)
	{
	    if(ref.getInstance().traceLevels().location >= 1)
	    {
	        StringBuffer s = new StringBuffer();
	        s.append("object not found\n");
	        s.append("object = " + ref.getInstance().identityToString(identity));
	        ref.getInstance().initializationData().logger.trace(
	            ref.getInstance().traceLevels().locationCat, s.toString());
	    }

	    Ice.NotRegisteredException e = new Ice.NotRegisteredException();
	    e.kindOfObject = "object";
	    e.id = ref.getInstance().identityToString(identity);
	    throw e;
	}
	catch(Ice.NotRegisteredException ex)
	{
	    throw ex;
	}
	catch(Ice.LocalException ex)
	{
	    if(ref.getInstance().traceLevels().location >= 1)
	    {
		StringBuffer s = new StringBuffer();
		s.append("couldn't contact the locator to retrieve adapter endpoints\n");
		if(adapterId.length() > 0)
		{
		    s.append("adapter = " + adapterId + "\n");
		}
		else
		{
		    s.append("object = " + ref.getInstance().identityToString(identity) + "\n");
		}
		s.append("reason = " + ex);
		ref.getInstance().initializationData().logger.trace(
		    ref.getInstance().traceLevels().locationCat, s.toString());
	    }
	    throw ex;
	}

	if(ref.getInstance().traceLevels().location >= 1)
	{
	    if(endpoints != null && endpoints.length > 0)
	    {
	        if(cached.value)
	        {
		    trace("found endpoints in locator table", ref, endpoints);
	        }
	        else
	        {
		    trace("retrieved endpoints from locator, adding to locator table", ref, endpoints);
	        }
	    }
	    else
	    {
	        StringBuffer s = new StringBuffer();
		s.append("no endpoints configured for ");
		if(adapterId.length() > 0)
		{
		    s.append("adapter\n");
		    s.append("adapter = " + adapterId + "\n");
		}
		else
		{
		    s.append("object\n");
		    s.append("object = " + ref.getInstance().identityToString(identity) + "\n");
		}
	    }
	}

	return endpoints == null ? new EndpointI[0] : endpoints;
    }

    public void
    clearObjectCache(IndirectReference ref)
    {
	if(ref.getAdapterId().length() == 0)
	{
	    Ice.ObjectPrx object = _table.removeProxy(ref.getIdentity());
	    if(object != null)
	    {
		if(((Ice.ObjectPrxHelperBase)object).__reference() instanceof IndirectReference)
		{
		    IndirectReference oir = (IndirectReference)((Ice.ObjectPrxHelperBase)object).__reference();
		    if(oir.getAdapterId().length() > 0)
		    {
			clearCache(oir);
		    }
		}
		else
		{
		    if(ref.getInstance().traceLevels().location >= 2)
		    {
			trace("removed endpoints from locator table",
			      ref, ((Ice.ObjectPrxHelperBase)object).__reference().getEndpoints());
		    }
		}
	    }
	}
    }
    
    public void
    clearCache(IndirectReference ref)
    {
	if(ref.getAdapterId().length() > 0)
	{
	    EndpointI[] endpoints = _table.removeAdapterEndpoints(ref.getAdapterId());

	    if(endpoints != null && ref.getInstance().traceLevels().location >= 2)
	    {
		trace("removed endpoints from locator table\n", ref, endpoints);
	    }
	}
	else
	{
	    Ice.ObjectPrx object = _table.removeProxy(ref.getIdentity());
	    if(object != null)
	    {
		if(((Ice.ObjectPrxHelperBase)object).__reference() instanceof IndirectReference)
		{
		    IndirectReference oir = (IndirectReference)((Ice.ObjectPrxHelperBase)object).__reference();
		    if(oir.getAdapterId().length() > 0)
		    {
			clearCache(oir);
		    }
		}
		else
		{
		    if(ref.getInstance().traceLevels().location >= 2)
		    {
			trace("removed endpoints from locator table",
			      ref, ((Ice.ObjectPrxHelperBase)object).__reference().getEndpoints());
		    }
		}
	    }
	}
    }

    private void
    trace(String msg, IndirectReference ref, EndpointI[] endpoints)
    {
	StringBuffer s = new StringBuffer();
	s.append(msg + "\n");
	if(ref.getAdapterId().length() > 0)
	{
	    s.append("adapter = " + ref.getAdapterId() + "\n");
	}
	else
	{
	    s.append("object = " + ref.getInstance().identityToString(ref.getIdentity()) + "\n");
	}

	s.append("endpoints = ");
	final int sz = endpoints.length;
	for(int i = 0; i < sz; i++)
	{
	    s.append(endpoints[i].toString());
	    if(i + 1 < sz)
		s.append(":");
	}

	ref.getInstance().initializationData().logger.trace(ref.getInstance().traceLevels().locationCat, s.toString());
    }

    private final Ice.LocatorPrx _locator;
    private Ice.LocatorRegistryPrx _locatorRegistry;
    private final LocatorTable _table;
}