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// **********************************************************************
//
// Copyright (c) 2003-2017 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.
//
// **********************************************************************
#pragma once
[["cpp:header-ext:h", "objc:header-dir:objc"]]
#include <Ice/ObjectAdapterF.ice>
#include <Ice/Current.ice>
["objc:prefix:ICE"]
module Ice
{
/**
*
* A servant locator is called by an object adapter to
* locate a servant that is not found in its active servant map.
*
* @see ObjectAdapter
* @see ObjectAdapter#addServantLocator
* @see ObjectAdapter#findServantLocator
*
**/
local interface ServantLocator
{
/**
*
* Called before a request is dispatched if a
* servant cannot be found in the object adapter's active servant
* map. Note that the object adapter does not automatically insert
* the returned servant into its active servant map. This must be
* done by the servant locator implementation, if this is desired.
*
* <tt>locate</tt> can throw any user exception. If it does, that exception
* is marshaled back to the client. If the Slice definition for the
* corresponding operation includes that user exception, the client
* receives that user exception; otherwise, the client receives
* {@link UnknownUserException}.
*
* If <tt>locate</tt> throws any exception, the Ice run time does <em>not</em>
* call <tt>finished</tt>.
*
* <p class="Note">If you call <tt>locate</tt> from your own code, you
* must also call <tt>finished</tt> when you have finished using the
* servant, provided that <tt>locate</tt> returned a non-null servant;
* otherwise, you will get undefined behavior if you use
* servant locators such as the Freeze Evictor.
*
* @param curr Information about the current operation for which
* a servant is required.
*
* @param cookie A "cookie" that will be passed to <tt>finished</tt>.
*
* @return The located servant, or null if no suitable servant has
* been found.
*
* @see ObjectAdapter
* @see Current
* @see #finished
*
**/
["UserException"] Object locate(Current curr, out LocalObject cookie);
/**
*
* Called by the object adapter after a request has been
* made. This operation is only called if <tt>locate</tt> was called
* prior to the request and returned a non-null servant. This
* operation can be used for cleanup purposes after a request.
*
* <tt>finished</tt> can throw any user exception. If it does, that exception
* is marshaled back to the client. If the Slice definition for the
* corresponding operation includes that user exception, the client
* receives that user exception; otherwise, the client receives
* {@link UnknownUserException}.
*
* If both the operation and <tt>finished</tt> throw an exception, the
* exception thrown by <tt>finished</tt> is marshaled back to the client.
*
* @param curr Information about the current operation call for
* which a servant was located by <tt>locate</tt>.
*
* @param servant The servant that was returned by <tt>locate</tt>.
*
* @param cookie The cookie that was returned by <tt>locate</tt>.
*
* @see ObjectAdapter
* @see Current
* @see #locate
*
**/
["UserException"] void finished(Current curr, Object servant, LocalObject cookie);
/**
*
* Called when the object adapter in which this servant locator is
* installed is destroyed.
*
* @param category Indicates for which category the servant locator
* is being deactivated.
*
* @see ObjectAdapter#destroy
* @see Communicator#shutdown
* @see Communicator#destroy
*
**/
void deactivate(string category);
};
};
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