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<HTML>
<HEAD>
<!-- $Id$ -->
<META NAME="GENERATOR" CONTENT="Adobe PageMill 2.0 Mac">
<TITLE>Options for TAO Components</TITLE>
</HEAD>
<BODY text = "#000000"
link="#000fff"
vlink="#ff0f0f"
bgcolor="#ffffff">
<HR><P>
<H3 ALIGN=CENTER>Options for TAO Components</H3>
<H3>Overview</H3>
TAO is an extremely flexible ORB that can be configured to meet a wide
range of application requirements. There are two primary mechanisms
for configuring TAO's behaviors:
<UL>
<LI> Configurations that are global to an ORB, such as
a Name Service IOR or the default stringified IOR
format an ORB generates, are configured via environment
variables or command-line option flags passed to the
<code>ORB_init()</code> call. The internal structure for
command-line options is the traditional
<CODE>argc</CODE>/<CODE>argv</CODE> vector of strings style
popularized by C/C++ and Unix. By convention,
<code>ORB_init()</code> will consume any options that it recognizes,
removing them from <CODE>argv</CODE>, whereas unrecognized options
will not be removed. <P>
<LI>Users can also modify the internal behaviors of an ORB by
dynamically linking <EM>ORB plug-ins</EM>, such as client/server connection
strategies, via a <code>svc.conf</code> file. These ORB plug-ins
can be fine-tuned by specifying their options in the
<code>svc.conf</code> file.
TAO provides several default plug-ins to deploy resource management
strategies, client/server strategies, and communication protocols
that can be further customized via the
<code>svc.conf</code> file options described in this page. Advanced
users can also develop their own plug-ins to customize TAO.
A <code>svc.conf</code> file, however, is not required to run TAO
programs since TAO provides a set of built-in strategies configured for
use with common use cases. Many of the default configuratiions for
these built-in strategies can also be customized when TAO is
compiled.<p>
</UL>
<HR><P>
<H3><A NAME="ev">Environment Variables</A></H3>
The following environment variables are supported by TAO:
<BLOCKQUOTE>
<P><TABLE BORDER="2" CELLSPACING="2" CELLPADDING="0" >
<TR>
<TH>Environment Variable</TH>
<TH>Description</TH>
</TR>
<TR>
<TD><CODE>NameServiceIOR</CODE> <EM>which</EM></TD>
<TD>
Specifies which IOR the Naming Service is listening on.
</TD>
</TR>
<TR>
<TD><CODE>NameServicePort</CODE> <EM>which</EM></TD>
<TD>
Specifies which port the Naming Service is listening on for multicast
requests.
</TD>
</TR>
<TR>
<TD><CODE>TradingServiceIOR</CODE> <EM>which</EM></TD>
<TD>
Specifies which IOR the Trading Service is listening on.
</TD>
</TR>
<TR>
<TD><CODE>TradingServicePort</CODE> <EM>which</EM></TD>
<TD>
Specifies which port the Trading Service is listening on for multicast
requests.
</TD>
</TR>
<TR>
<TD><CODE>ImplRepoServiceIOR</CODE> <EM>which</EM></TD>
<TD>
Specifies the IOR of an Implementation Repository.
</TD>
</TR>
<TR>
<TD><CODE>ImplRepoServicePort</CODE> <EM>which</EM></TD>
<TD>
Specifies which port the Implementation Repository is listening on for
multicast requests.
</TD>
</TR>
</TABLE>
</P>
</BLOCKQUOTE>
<HR><P>
<H3>Types of Options</H3>
<blockquote>
<P>The following components can be tuned via the different options
mentioned above:</P>
<!-- We should try to split these across files. Looks cumbersome to -->
<!-- manage. -->
<UL>
<LI><A HREF="#ORB"><CODE>CORBA::ORB</CODE></A>
<LI><A HREF="#DefaultResourceFactory"><CODE>TAO_Default_Resource_Factory</CODE></A>
<LI><A HREF="#AdvancedResourceFactory"><CODE>TAO_Advanced_Resource_Factory</CODE></A>
<LI><A HREF="#DefaultServer"><CODE>TAO_Default_Server_Strategy_Factory</CODE></A>
<LI><A HREF="#DefaultClient" TARGET="_top"><CODE>TAO_Default_Client_Strategy_Factory</CODE></A>
<LI><A HREF="#RT_ORB_Loader"><CODE>RT_ORB_Loader</CODE></A>
</UL>
The details of the options are mentioned below.
</blockquote>
<HR><H3><A NAME="ORB"></A><CODE>CORBA::ORB</CODE></H3>
<blockquote>
<P>Typically, the following options are set via command line
parameters that are eventually passed to CORBA::ORB_init (). </P>
<p><em>Note:</em> <code>-ORBGlobalCollocation</code> flag has been
merged with <a href="#-ORBCollocation"><code>-ORBCollocation</code></a>.
<blockquote>
<P><TABLE BORDER="2" CELLSPACING="2" CELLPADDING= "0">
<TR>
<TH>Option</TH>
<TH>Description</TH>
</TR>
<!-- <TR NAME="ORBsvcconf"> -->
<tr>
<TD><CODE><A NAME="-ORBSvcConf">-ORBSvcConf</A></CODE> <EM>config filename</EM></TD>
<TD>Specifies the name of the file from which it will read dynamic service configuration
directives <EM>ala</EM> ACE's Service Configurator. By
default, a service configurator-based application will look
for a file named "svc.conf" in the current directory.</TD>
</TR>
<!-- <TR NAME="ORBsvcconf"> -->
<tr>
<TD><CODE>-ORBSvcConfDirective</CODE> <EM>directivestring</EM></TD>
<TD>Specifies a service configuration directive, which is passed to ACE's Service Configurator.
You can pass multiple of these options on the same command-line. </TD>
</TR>
<tr>
<TD><CODE><A
NAME="-ORBServiceConfigLoggerKey">-ORBServiceConfigLoggerKey</A></CODE>
<EM>logger key</EM></TD>
<TD>Set the logger key in the <CODE>ACE_Service_Config</CODE>
framework. Equivalent to the <CODE>-k</CODE> option on the ACE
service configurator class.
</TD>
</TR>
<TR>
<TD><CODE>-ORBDaemon</CODE></TD>
<TD>Specifies that the ORB should <I>daemonize</I> itself.</TD>
</TR>
<TR>
<TD><CODE>-ORBDebug</CODE></TD>
<TD>Turns on the output of debugging messages within ACE's Service Configurator
componentry.</TD>
</TR>
<TR>
<TD><CODE>-ORBDebugLevel</CODE> <EM>level</EM></TD>
<TD>Control the level of debugging in the ORB. Higher number produce
more output (try 10).
</TD>
</TR>
<TR>
<TD><CODE><A HREF="ORBEndpoint.html">-ORBEndpoint</A></CODE>
<EM>endpoint</EM></TD>
<TD><a name="-ORBEndpoint"></a>Tells the ORB to listen for requests on the
interface specified by <I><EM>endpoint</EM></I>. Endpoints are
specified using a URL style format. An endpoint has the form:
<blockquote><CODE>
protocol://V.v@addr1,...,W.w@addrN
</CODE></blockquote>
where <CODE>V.v</CODE> and <CODE>W.w</CODE> are optional protcol versions for
each address. An example of an IIOP endpoint is:
<blockquote><CODE>
iiop://<I><EM>hostname</EM></I>:<I><EM>port</EM></I>
</CODE></blockquote>
Sets of endpoints may be specified using multiple <CODE>-ORBEndpoint</CODE>
options or by delimiting endpoints with a semi-colon (;). For example,
<blockquote><CODE>
-ORBEndpoint iiop://localhost:9999 -ORBEndpoint uiop:///tmp/mylocalsock -ORBEndpoint shmiop://10002
</CODE></blockquote>
is equivalent to:
<blockquote><CODE>
-ORBEndpoint 'iiop://localhost:9999;uiop:///tmp/mylocalsock;shmiop://10002'
</CODE></blockquote>
Notice the single quotes (') in the latter option specification. Single
quotes are needed to prevent the shell from interpreting text after the
semi-colon as another command to run.<P>
If an endpoint is specified without an <CODE>addr</CODE> such as the following:
<blockquote><CODE>
-ORBEndpoint uiop:// -ORBEndpoint shmiop://
</CODE></blockquote>
then a default endpoint will be created for the specified protocol.
<P>
This is a server side option.
</TD>
</TR>
<TR>
<TD><CODE>-ORBObjRefStyle</CODE> <EM>which</EM></TD>
<TD>Specifies the user-visible style of object references. The range of values
is <CODE>IOR</CODE> (default), which is the traditional nonsensical object reference,
or <CODE>URL</CODE>, which looks more like a URL.</TD>
</TR>
<TR>
<TD><CODE>-ORBRcvSock</CODE> <EM>receive buffer size</EM></TD>
<TD><A NAME="-ORBRcvSock"></a>Specify the size of the socket receive buffer as a positive, non-zero integer.
If not specified, the ACE_DEFAULT_MAX_SOCKET_BUFSIZ default is used.</TD>
</TR>
<TR>
<TD><CODE>-ORBSndSock</CODE> <EM>send buffer size</EM></TD>
<TD><A NAME="-ORBSndSock"></a>Specify the size of the socket send buffer as a positive, non-zero integer.
If not specified, the ACE_DEFAULT_MAX_SOCKET_BUFSIZ default is used.</TD>
</TR>
<TR>
<TD><CODE>-ORBNodelay</CODE> <EM>boolean (0|1)</EM></TD>
<TD><A NAME="-ORBNodelay"></a>Enable or disable the TCP_NODELAY
option. By default, TCP_NODELAY is enabled.</TD>
</TR>
<TR>
<TD><CODE>-ORBNameServicePort</CODE> <EM>portspec</EM></TD>
<TD>Specifies which port the Naming Service is listening on for
multicast requests. By default,
TAO_DEFAULT_NAME_SERVICE_REQUEST_PORT, which is 10013 is used.</TD>
</TR>
<TR>
<TD><CODE>-ORBTradingServicePort</CODE> <EM>portspec</EM></TD>
<TD>Specifies to which port the Trading Service is listening on for
multicast requests. By default,
TAO_DEFAULT_TRADING_SERVICE_REQUEST_PORT which is 10016 is used.</TD>
</TR>
<TR>
<TD><CODE>-ORBImplRepoServicePort</CODE> <EM>portspec</EM></TD>
<TD>Specifies to which port the Implementation Repository is listening on for
multicast requests. By default,
TAO_DEFAULT_IMPLREPO_SERVER_REQUEST_PORT which is 10018 is to
be used.</TD>
</TR>
<TR>
<TD><CODE>-ORBMulticastDiscoveryEndpoint</CODE> <EM>end_point</EM></TD>
<TD>Specifies the endpoint that should be used for locating the
Naming Service through multicast. <EM>end_point</EM> is of the
form ip-number:port-number (e.g., "tango.cs.wustl.edu:1234" or
"128.252.166.57:1234"). If there is no ':' in the end_point it
is assumed to be a port number, with the IP address being INADDR_ANY.
</TR>
<TR>
<TD><CODE>-ORBCollocation</CODE> <EM>global/per-orb/no</EM></TD>
<TD><a name="-ORBCollocation"></a>Specifies the use of collocation
object optimization. If <em>global</em> is
specified, objects in the same process will be treated as collocated.
If <em>per-orb</em> is specified, only objects in the same ORB are
treated as collocated. When <em>no</em> is specified, no objects are
treated as collocated. Default is global.</TD>
</TR>
<TR>
<TD>
<CODE>-ORBCollocationStrategy</CODE> <EM>thru_poa/direct</EM>
</TD>
<TD>
Specifies what kind of collocated object to use. If the
<em>thru_poa</em> strategy is used, TAO uses the collocation
object implementation that respects POA's current state and
policies. When using the <em>direct</em> strategy, method
invocations on collocated objects become direct calls to servant
without checking POA's status (which translates to better
performance.) Notice that the interfaces that you wish to use
direct collocation with must be compiled with <code>
<a href="compiler.html#collocation-stubs">-Gd</a>
</code>. Default is thru_poa.
</TD>
</TR>
<TR>
<TD><CODE>-ORBPreconnect</CODE> <EM>endpoint</EM></TD>
<TD><A name="-ORBPreconnect"></a>Pre-establishes a blocking connection to
each listed <EM>endpoint</EM>. If a connection cannot be established the
failed preconnection will be ignored and the next preconnection in the list
will be processed. Successful and unsuccessful preconnections will be
displayed if a debugging level greater than or equal to one is specified by
using the <CODE>-ORBDebugLevel</CODE> option. Listing the same combination
multiple times will properly establish multiple connections to that endpoint.
The <CODE>-ORBPreconnect</CODE> option uses the same endpoint format as the
<CODE>-ORBEndpoint</CODE> option.
<P>
This is a client-side option.
<P>
<FONT COLOR=RED>-ORBPreconnect is <STRONG>deprecated</STRONG>.
This option will be removed in the near future. The Real-Time CORBA standard
<CODE>validate_connection()</CODE> method should be used
instead.
</TD>
</TR>
<TR>
<TD><CODE>-ORBCDRTradeoff</CODE> <EM>maxsize</EM></TD>
<TD><A name="-ORBCDRTradeoff"></a>Control the strategy to tradeoff
between copy vs. no copy marshalling of octet sequences.
If an octet sequence is smaller than <EM>maxsize</EM> and the current
message block contains enough space for it the octet sequence is
copied instead of appended to the CDR stream. By default,
ACE_DEFAULT_CDR_MEMORY_TRADEOFF is used.
</TD>
</TR>
<TR>
<TD><CODE>-ORBSkipServiceConfigOpen</CODE></TD>
<TD><A name="-ORBSkipServiceConfigOpen"></a>Do not call the
<code>ACE_Service_Config::open</code> method when initializing the
ORB. This option is generally only useful when dynamically loading
the ORB.
<P>
<FONT COLOR=RED>This option is <STRONG>deprecated</STRONG>. It
is no longer needed since the Service Configurator is now
reentrant and thread-safe.</FONT>
</TD>
</TR>
<TR>
<TD><CODE>-ORBDottedDecimalAddresses</CODE> <EM>boolean (0|1)</EM></TD>
<TD><A name="-ORBDottedDecimalAddresses"></a> Use the dotted decimal
notation for addresses. This option helps to work around
broken DNS implementations and may also reduce the time spent
resolving IP addresses. By default domain names are used in IORs.</TD>
</TR>
<TR>
<TD><CODE>-ORBInitRef</CODE> <EM>ObjectId=IOR</EM></TD>
<TD><A name="-ORBInitRef"></a> Allows specification of an arbitrary
object reference for an initial service. The IOR could be in any
one of the following formats : OMG IOR, URL, corbaloc (including
uioploc) or file. corbaloc is a multiple end-point IOR understood by
the string_to_object () method and used as a boot-strapping
mechanism by the resolve_initial_references () method. The mappings
specified through this argument override the orb-install-time
defaults. The file://<I>pathname</I> interprets the contents of the
<I>pathname</I> file as an object reference in any of the above
formats.
</TD>
</TR>
<TR>
<TD><CODE>-ORBDefaultInitRef</CODE> <EM>IOR prefix</EM></TD>
<TD><A name="-ORBDefaultInitRef"></a> This argument allows
resolution of initial references not explicitly specified with
-ORBInitRef. It requires a URL prefix that, after appending a
slash '/' ('|' for UIOP pluggable protocol) and a simple
object key, forms a new URL to identify an initial object
reference. The URL prefix format currently supported is
corbaloc.
</TD>
</TR>
<TR>
<TD><CODE>-ORBStdProfileComponents</CODE> <EM>boolean (0|1)</EM></TD>
<TD><A name="-ORBStdProfileComponents"></a> If <EM>0</EM> then the ORB
does not generate the OMG standardized profile
components, such as the ORB type and code sets.
Notice that the presence of this components is optional
in GIOP 1.1
The default value is controlled by a compile-time flag
(check orbconf.h).</TD>
</TR>
<TR>
<TD><CODE>-ORBResources</CODE> <EM>which</EM></TD>
<TD><A name=-ORBResources> <FONT COLOR=RED>This option is
<STRONG>deprecated</STRONG>, since this option has almost
negligible effect on the ORB</FONT>. The right type of resources
are selected by the ORB during runtime. For example the memory for
the output datapath always defaults to TSS. The inour data path
always defaults to stack for small messages and global pool for
larger messages. There was no effect with the use of this option.
</TD>
</TR>
<TR>
<TD><CODE>-ORBUseIMR</CODE> <EM>boolean (0|1)</EM></TD>
<TD><A name=-ORBUseIMR></A>This argument specifies that for POAs with the
PERSISTENT policy, that the Implementation Repository should be used for
notification of startup and shutdown and Object References should be changed
to use the Implementation Repository also.
</TD>
</TR>
<TR>
<TD><CODE>-ORBLogFile</CODE> <EM>log file name</EM></TD>
<TD><A name=-ORBLogFile></A>Causes all ACE_DEBUG and ACE_ERROR
output to be redirected to the specified file.
</TD>
</TR>
<TR>
<TD><CODE>-ORBSingleReadOptimization</CODE> <EM>boolean (0|1)</EM></TD>
<TD><A name=-ORBSingleReadOptimization></A>This option controls
single read optimzations when reading requests. If this option is
off, the ORB will do two reads to read a request. One to read the
request header and the other to read the request payload. If this
option is on, the ORB will do a read of size
<EM>TAO_MAXBUFSIZE</EM>, hoping to read the entire request.
However, in this case, there is a chance of reading more than one
request. If any additional requests have been read, they are
queued up for processing later.<p>
This option defaults to <EM>1</EM> because it can provide better
performance since one less read is performed. However, in the
case of RT-CORBA, this option should be set to <EM>0</EM>.
Consider the following scenario: two requests are read from one
socket; the additional request is queued; a Reactor notify is
dispatch to awake a follower threads; at this time, new requests
arrive on others sockets of higher priority; however, since
notifies are given preferences over normal I/O, the lower priority
queued message will be processed before the newly arrived higher
priority request.
</TD>
</TR>
</TABLE>
</P>
</blockquote>
</blockquote>
<HR><H3><A NAME="DefaultResourceFactory"></A><CODE>TAO_Default_Resource_Factory</CODE></H3>
<blockquote>
Typically, the following options are set via the service configurator
(svc.conf) file. The following line in the svc.conf file (all in one line)
<p><code>static Resource_Factory "[list of options]"</code></p>
would load all the options listed within "".
<P><TABLE BORDER="2" CELLSPACING="2" CELLPADDING="0">
<TR>
<TH>Option</TH>
<TH>Description</TH>
</TR>
<TR>
<TD><CODE>-ORBResources</CODE> <EM>which</EM></TD>
<TD><A name=-ORBResources> <FONT COLOR=RED>This option is
<STRONG>deprecated</STRONG>, since this option has almost
negligible effect on the ORB</FONT>. The right type of resources
are selected by the ORB during runtime. For example the memory for
the output datapath always defaults to TSS. The inour data path
always defaults to stack for small messages and global pool for
larger messages. There was no effect with the use of this option.
</TR>
<TR>
<TD><CODE>-ORBReactorMaskSignals</CODE> <EM>0/1</EM></TD>
<TD>ACE select reactors mask signals during upcalls to the event
handlers. This is only useful if the application is going to
trap those signals and handle them in any way.
Disabling the mask can improve performance by reducing the
number of kernel level locks.
</TD>
</TR>
<TR>
<TD><CODE>-ORBProtocolFactory</CODE> <EM>factory</EM></TD>
<TD><a name="-ORBProtocolFactory"></a>
Specify which pluggable protocol factory to load. By default,
only the factory for the IIOP protocol
(<code>IIOP_Factory</code> is loaded.
<p>
For example, if some protocol called <em><code>Foo</code></em> whose
factory was called <em><code>Foo_Factory</code></em> was available,
then it could be loaded into TAO by specifying
<code>-ORBProtocolFactory Foo_Factory</code> in the service
configurator file. The
<em><code>Foo</code></em> pluggable protocol would then be available
for use.
</TD>
</TR>
<TR>
<TD><CODE>-ORBIORParser</CODE> <EM>parser</EM></TD>
<TD><a name="-ORBIORParser"></a>
Name an IOR Parser to load.
IOR Parsers are used to interpret strings passed to
<CODE>ORB::string_to_object()</CODE>.
By default the ORB can handle multiple string formats,
including <CODE>IOR:</CODE>,
<CODE>corbaloc:</CODE>,
<CODE>corbaname:</CODE>,
and <CODE>file:</CODE>.
The application developer can
<A HREF="ior_parsing.html">
add new IOR formats
</A>
using this option.
</TD>
</TR>
<TR>
<TD><CODE>-ORBConnectionCachingStrategy</CODE> <EM>type</EM></TD>
<TD><a name="-ORBConnectionCachingStrategy"></a>
<FONT COLOR=RED>This option is <STRONG>deprecated</STRONG>. Use
-ORBConnectionPurgingStrategy instead.</FONT>
</TD>
</TR>
<TR>
<TD><CODE>-ORBConnectionPurgingStrategy</CODE> <EM>type</EM></TD>
<TD><a name="-ORBConnectionPurgingStrategy"></a>
Opened connections are added to the transport cache so they can be
reused. However, if a process continues to run and these
connections are not reused, the cache will continue to grow.
Therefore, before each new connection, the cache is checked and
purged if it has reached the limit specified by the
-ORBConnectionCacheMax option or the system default if that option was
not used. The possible values for type are lru, lfu, fifo and null.
The default is LRU (Least Recently Used). The others LFU (Least
Frequently Used), FIFO (First In First Out), and null (No connections
are purged) are contained within the TAO Strategies library.
</TD>
</TR>
<TR>
<TD><CODE>-ORBConnectionCacheMax</CODE> <EM>limit</EM></TD>
<TD><a name="-ORBConnectionCacheMax"></a>
The transport cache will grow to a maximum of the specified limit.
The default is system dependent, but can be overridden at compile
time by defining the preprocessor macro TAO_CONNECTION_CACHE_MAXIMUM.
</TD>
</TR>
<TR>
<TD><CODE>-ORBMuxedConnectionMax</CODE> <EM>number</EM></TD>
<TD><a name="-ORBMuxedConnectionMax"></a>
The transport cache allows only specified number of
connections-per-QoS property to be added to connection
cache. Threads not getting the connections will wait for the
connections to be released. This options is more useful for
transports using a muxed connection strategy and want control on
the number of connections that are created by the active threads.
</TD>
</TR>
<TR>
<TD><CODE>-ORBConnectionCachePurgePercentage</CODE> <EM>percent</EM></TD>
<TD><a name="-ORBConnectionCachePurgePercentage"></a>
If the transport cache is purged, the specified percentage (20 by
default) of the total number of connections cached will be closed.
</TD>
</TR>
<TR>
<TD><CODE>-ORBPurgePercentage</CODE> <EM>percent</EM></TD>
<TD><a name="-ORBPurgePercentage"></a>
This option is deprecated and will automatically forward to
-ORBConnectionCachePurgePercentage.
</TD>
</TR>
<TR>
<TD><CODE>-ORBConnectionCacheLock</CODE> <EM>locktype</EM></TD>
<TD><a name="-ORBConnectionCacheLock"></a>
Specify the type of lock to be used by the Connection
Cache. Possible values for lock type are <code>thread</code>, which specifies
that an inter-thread mutex is used to guarantee exclusive
access, and <code>null</code>, which specifies that no locking be
performed. The default is thread.
</TD>
</TR>
<TR>
<TD><CODE>-ORBFlushingStrategy</CODE> <EM>type</EM></TD>
<TD><a name="-ORBFlushingStrategy"></a>
By default TAO provides three strategies to flush queued
messages.
The <CODE>leader_follower</CODE> strategy uses the Reactor and
non-blocking I/O to send the outgoing messages,
this strategy participates in the Leader/Followers protocol to
synchronize access to the Reactor.
The <CODE>reactive</CODE> strategy uses the Reactor but does not
take part in the Leader/Followers
protocol, thus it is better used only
in single threaded applications.
Finally, the <CODE>blocking</CODE> strategy flushes the
queue as soon as it becomes "full", and blocks the
thread until all the data is sent.
</TD>
</TR>
</TABLE>
</P>
</blockquote>
<HR><H3><A NAME="DefaultServer"></A><CODE>TAO_Default_Server_Strategy_Factory</CODE></H3>
<blockquote>
Typically, the following options are set via the service configurator
(svc.conf) file. The following line in the svc.conf file (all in one line)
<p><code>static Server_Strategy_Factory "[list of options]"</code></p>
would load all the options listed within ""
<p><em>Note:</em> <code>-ORBDemuxStrategy</code> flag has been changed to <code>-ORBSystemidPolicyDemuxStrategy</code> and <code>-ORBUseridPolicyDemuxStrategy</code>.
<p><em>Note:</em> <code>-ORBTableSize</code> flag has been changed to <code>-ORBActiveObjectMapSize</code>.
<P><TABLE BORDER="2" CELLSPACING="2" CELLPADDING="0" >
<TR>
<TH>Option</TH>
<TH>Description</TH>
</TR>
<TR>
<TD><a name="orb_concurrency"><CODE>-ORBConcurrency</CODE></a>
<EM>which</EM></TD>
<TD>Specify which
concurrency strategy to use. Range of values is <code>reactive</code>
for a purely Reactor-driven concurrency strategy or
<code>thread-per-connection</code> for creating a new thread to
service each connection. The default is reactive.
</TD>
</TR>
<TR>
<TD><a name="server_timeout"><CODE>-ORBThreadPerConnectionTimeout</CODE></a>
<EM>milliseconds</EM></TD>
<TD>In many platforms it is impossible to interrupt the server
threads created by the
<code>thread-per-connection</code> model.
This is because these threads are blocked in
<CODE>read()</CODE> operations (and not in
<CODE>select()</CODE>).
As a workaround, the server threads
periodically poll the ORB to find out if they should
shutdown.
This option controls the period of the polling,
expressed in milliseconds.
Applications that do not shutdown, or that can otherwise
ensure that no server threads will be running at
shutdown (for example if all the clients terminate
before the server) can disable the polling using the
magic value <CODE>INFINITE</CODE>.
<P>
If the option is not provided then the ORB uses the
compile time flag
<CODE>TAO_DEFAULT_THREAD_PER_CONNECTION_TIMEOUT</CODE>,
this flag also expresses the time in milliseconds (as
a string constant) and the magic value
<CODE>"INFINITE"</CODE> can be used to disable polling
entirely. This yields a slight performance improvement
(around 1%).
</P>
</TD>
</TR>
<TR>
<TD><CODE>-ORBActiveObjectMapSize</CODE> <EM>active object map
size</EM></TD>
<TD>Specify the size of the active object map. If not
specified, the default value is 64.</TD>
</TR>
<TR>
<TD><CODE>-ORBUseridPolicyDemuxStrategy</CODE> <EM>user id policy
based demultiplexing strategy</EM></TD>
<TD>Specify the demultiplexing
lookup strategy to be used with the user id policy. The
<EM>demultiplexing strategy</EM> can be one of <CODE>dynamic</CODE> or
<CODE>linear</CODE>. This option defaults to use the
<CODE>dynamic</CODE> strategy. </TD>
</TR>
<TR>
<TD><CODE>-ORBSystemidPolicyDemuxStrategy</CODE> <EM>system id policy
based demultiplexing strategy</EM></TD>
<TD>Specify the demultiplexing lookup strategy to be used with the
system id policy. The <EM>demultiplexing strategy</EM> can be
one of <CODE>dynamic</CODE>, <CODE>linear</CODE>, or
<CODE>active</CODE>. This option defaults to use the
<CODE>dynamic</CODE> strategy when
<CODE>-ORBAllowReactivationOfSystemids</CODE> is true, and to
<CODE>active</CODE> strategy when
<CODE>-ORBAllowReactivationOfSystemids</CODE> is false. </TD>
</TR>
<TR>
<TD><CODE>-ORBUniqueidPolicyReverseDemuxStrategy</CODE> <EM>unique id
policy based reverse demultiplexing strategy</EM></TD>
<TD>Specify the
reverse demultiplexing lookup strategy to be used with the unique id
policy. The <EM>reverse demultiplexing strategy</EM> can be one of
<CODE>dynamic</CODE> or <CODE>linear</CODE>. This option defaults to
use the <CODE>dynamic</CODE> strategy. </TD>
</TR>
<TR>
<TD><CODE>-ORBAllowReactivationOfSystemids</CODE> <EM>allows
reactivation of system ids</EM></TD>
<TD>Specify whether system ids
can be reactivated, i.e., once an id that was generated by the system
has be deactivated, will the user reactivate a new servant using the
old id. If the user is not going to use this feature, the IORs can be
shortened, an extra comparison in the critical upcall path removed,
and some memory on the server side can be saved. The
<CODE>ORBAllowReactivationOfSystemids</CODE> can be <CODE>0</CODE> or
<CODE>1</CODE>. This option defaults to <CODE>1</CODE>. </TD>
</TR>
<TR>
<TD><CODE>-ORBActiveHintInIds</CODE> <EM>adds an active hint in
ids</EM></TD>
<TD>Specify whether an active hint should be added to
ids. With active hints, ids can be found quickly. However, they lead
to larger IORs. Note that this option is disregarded
<CODE>-ORBAllowReactivationOfSystemids</CODE> is set to
<CODE>0</CODE>. The <EM>-ORBActiveHintInIds</EM> can be <CODE>0</CODE>
or <CODE>1</CODE>. This option defaults to <CODE>1</CODE>. </TD>
</TR>
<TR>
<TD><CODE>-ORBPoaMapSize</CODE> <EM>poa map size</EM></TD>
<TD>Specify
the size of the poa map. If not specified, the default value is
24.</TD>
</TR>
<TR>
<TD><CODE>-ORBPersistentidPolicyDemuxStrategy</CODE> <EM>persistent
id policy based demultiplexing strategy</EM></TD>
<TD>Specify the
demultiplexing lookup strategy to be used with the persistent id
policy. The <EM>demultiplexing strategy</EM> can be one of
<CODE>dynamic</CODE> or <CODE>linear</CODE>. This option defaults to
use the <CODE>dynamic</CODE> strategy. </TD>
</TR>
<TR>
<TD><CODE>-ORBTransientidPolicyDemuxStrategy</CODE> <EM>transient id
policy based demultiplexing strategy</EM></TD>
<TD>Specify the
demultiplexing lookup strategy to be used with the transient id
policy. The <EM>demultiplexing strategy</EM> can be one of
<CODE>dynamic</CODE>, <CODE>linear</CODE>, or
<CODE>active</CODE>. This option defaults to use the
<CODE>active</CODE> strategy. </TD>
</TR>
<TR>
<TD><CODE>-ORBActiveHintInPOANames</CODE> <EM>adds an active hint in
poa names</EM></TD>
<TD>Specify whether an active hint should be added
to poa names. With active hints, poa names can be found quickly.
However, they lead to larger IORs. The
<EM>-ORBActiveHintInPOANames</EM> can be <CODE>0</CODE> or
<CODE>1</CODE>. This option defaults to <CODE>1</CODE>. </TD>
</TR>
<TR>
<TD><CODE>-ORBThreadFlags</CODE> <EM>thread flags</EM></TD>
<TD>Specify the flags used for thread creation. Flags can be any
logical-OR combination of <CODE>THR_DETACHED</CODE>,
<CODE>THR_BOUND</CODE>, <CODE>THR_NEW_LWP</CODE>,
<CODE>THE_SUSPENDED</CODE>. The default is <CODE>THR_BOUND |
THR_DETACHED</CODE> . </TD>
</TR>
<TR>
<TD><CODE>-ORBPOALock</CODE> <EM>lock type</EM></TD>
<TD><a
name="-ORBPOALock"></a>Specify the type of lock to be used for POA
accesses. Possible values for <em>lock type</em> are
<code>thread</code>, which specifies that an inter-thread mutex is
used to guarantee exclusive access, and <code>null</code>, which
specifies that no locking be performed. The default is
<code>thread</code>.</TD>
</TR>
</TABLE>
</P>
</blockquote>
<HR><H3><A NAME="DefaultClient"></A><CODE>TAO_Default_Client_Strategy_Factory</CODE></H3>
<BLOCKQUOTE>
Typically, the following options are set via the service configurator
(svc.conf) file. The following line in the svc.conf file (all in one line)
<p><code>static Client_Strategy_Factory "[list of options]"</code></p>
would load all the options listed within "".
<P><TABLE BORDER="2" CELLSPACING="2" CELLPADDING="0" >
<TR>
<TH>Option</TH>
<TH>Description</TH>
</TR>
<TR>
<TD><CODE><a name="#-ORBProfileLock">-ORBProfileLock</a></CODE> <EM>which</EM></TD>
<TD>
Specify the kind of synchronization primitive for the
Profiles.
Default is <code>thread</code>, which means that a regular thread
mutex is used. The
second option is <code>null</code>, which means a null lock is used.
This makes sense in case of optimizations and is allowed when
no forwarding is used or only a single threaded client.
</TD>
</TR>
<TR>
<TD><CODE>-ORBClientConnectionHandler</CODE> <EM>MT / ST / RW</EM></TD>
<TD><A name="-ORBClientConnectionHandler"></a>
ST means use the single-threaded client connection handler, i.e., the
leader follower model will not be used. However, ST does support
nested upcalls and handling of new requests while waiting for the
reply from a server. <p>
MT means use the multi-threaded client connection handler which uses
the leader follower model. This model allows the use of multiple
threads with a single Reactor. <p>
RW selects a strategy that simply blocks in recv() when waiting for a
response from the server instead of waiting in the Reactor. The RW
strategy only works when the application does not have to worry about
new request showing up when waiting for a
response. Further, this strategy cannot be used with AMI
calls. Therefore, this strategy is appropriate only for "pure"
synchronous clients. Note that applications with nested
upcalls are not "pure" synchronous clients. Also note
that this strategy will only effect two way calls, since there is no
waiting for one way calls. This strategy can also be used in an
application that is both a client and a server if the server side is
handled by a separate thread and the client threads are "pure"
clients. <p>
Default for this option is MT.
</TD>
</TR>
<TR>
<TD><CODE>-ORBReplyDispatcherTableSize</CODE> <EM>integer</EM></TD>
<TD><A name="-ORBReplyDispatcherTableSize"></a>
This options sets the size of the table that maps the reply
dispatcher to the request id's. Every entry in the table
consumes 16 bytes. The table is on a per transport
basis. Keeping the table size lower is recommended for
applications that need lower run-time memory consumption. The
default value is 16.
</TD>
</TR>
<TR>
<TD><CODE>-ORBTransportMuxStrategy</CODE> <EM>EXCLUSIVE / MUXED</EM></TD>
<TD><A name="-ORBTransportMuxStrategy"></a>
EXCLUSIVE means that the Transport does not multiplex requests on a
connection. At a time, there can be only one request pending on a
connection. <p>
MUXED means that Transport multiplexes more than one request at the
same time on a connection. This option is often used in
conjunction with Asynchronous Method Invocation, because
multiple requests can be sent 'in bulk'. <p>
Default for this option is MUXED.
</TD>
</TR>
<TR>
<TD><CODE>-ORBConnectStrategy</CODE> <EM>type</EM></TD>
<TD><a name="-ORBConnectStrategy"></a>
TAO provides three strategies to connect to remote servers.
The default <CODE>leader_follower</CODE> strategy uses the
Reactor and non-blocking connects to connect and this strategy
participates in the Leader/Followers protocol to synchronize
access to the Reactor. The <CODE>reactive</CODE> strategy uses
the Reactor for non-blocking connects but does not take part in
the Leader/Followers protocol, thus it is better used only in
single threaded applications. Finally, the <CODE>blocked</CODE>
strategy as the name implies, blocks the thread until
connection is complete. Some of the protocols in TAO viz. SHMIOP
and SSLIOP can only use blocked strategy.
</TD>
</TR>
</TABLE>
</P>
</BLOCKQUOTE>
<HR><H3><A NAME="AdvancedResourceFactory"></A><CODE>TAO_Advanced_Resource_Factory</CODE></H3>
<p>This factory is located in the TAO_Strategies library.
It accepts the options below as well as those described above in the
<A HREF="#DefaultResourceFactory"><CODE>TAO_Default_Resource_Factory</CODE></A>.
This factory can be loaded dynamically using a service configurator
directive of the form (all on one line):
<p><code>dynamic Advanced_Resource_Factory Service_Object * TAO_Strategies:_make_TAO_Advanced_Resource_Factory () "-ORBReactorType select_st"</code>
<p>It can also be loaded statically by doing the following:
<UL>
<LI>Add a <code>#include "tao/Strategies/advanced_resource.h"</code> to the file containing <code>main()</code>
<LI>Link the TAO_Strategies library into the executable
<LI>Specify a service configurator directive of the form: <code>static Advanced_Resource_Factory "-ORBReactorType select_st"</code>
</UL>
<p>You can omit the <code>#include</code> if you always use dynamic libraries.
<p>Once you have loaded the Advanced_Resource_Factory, then directives for the Resource_Factory have no effect (and generate warnings telling you so).
<p><em>Note:</em> <code>-ORBReactorLock</code> flag has been
superseded by <code><A HREF="#-ORBReactorType">-ORBReactorType</A></code>.
<blockquote>
<P><TABLE BORDER="2" CELLSPACING="2" CELLPADDING="0">
<TR>
<TH>Option</TH>
<TH>Description</TH>
</TR>
<TR>
<TD><CODE>-ORBReactorType</CODE> <EM>which</EM></TD>
<TD><a name="-ORBReactorType"></a>Specify what kind of reactor the
ORB uses. The default reactor is the ACE_TP_Reactor.
<TABLE BORDER="1" CELLSPACING="2" CELLPADDING="0">
<TR><TH><em>which</em></TH><TH>Reactor</TH>
</TR>
<TR>
<TD><CODE>select_mt</CODE></TD>
<TD>Use the multi-thread select-based reactor.</TD>
</TR>
<TR>
<TD><CODE>select_st</CODE></TD>
<TD>Use the single-thread select-based reactor.</TD>
</TR>
<TR>
<TD><CODE>fl</CODE></TD>
<TD>Use the FLReactor (FLTK-based).</TD>
</TR>
<TR>
<TD><CODE>wfmo</CODE></TD>
<TD>Use the WFMO reactor (Win32 only).</TD>
</TR>
<TR>
<TD><CODE>msg_wfmo</CODE></TD>
<TD>Use the MsgWFMO reactor (Win32 only).</TD>
</TR>
<TR>
<TD><CODE>tp</CODE></TD>
<TD>Use the <CODE>ACE_TP_Reactor</CODE>, a select based
thread-pool reactor which is the default.</TD>
</TR>
</TABLE>
</TD>
</TR>
<TR>
<TD><CODE>-ORBReactorThreadQueue</CODE> <EM>which</EM></TD>
<TD><a name="-ORBReactorThreadQueue"></a>
Applies only to the ACE_TP_Reactor, i.e., when <CODE>-ORBReactorType</CODE>
= <CODE>tp</CODE>, and specifies the order, last-in-first-out
(<EM>which</EM> = <CODE>LIFO</CODE>), the default, or first-in-first-out
(<EM>which</EM> = <CODE>FIFO</CODE>), in which waiting threads are selected
to run by the ACE_Select_Reactor_Token.
</TD>
</TR>
<TR>
<TD><CODE>-ORBInputCDRAllocator</CODE> <EM>which</EM></TD>
<TD><a name="-ORBInputCDRAllocator"></a>
Specify whether the ORB uses locked
(<em>which</em> = <code>thread</code>)
or lock-free (<em>which</em> = <code>null</code>)
allocators for the incoming CDR buffers.
Though <CODE>null</CODE> should give the
optimal performance;
we made the default <CODE>thread</CODE>.
TAO optimizations for octet sequences will not work in all cases when
the allocator does not have locks (for example if the
octet sequences are part of a return value).
Using locked allocators also allows the users to
take advantage of the TAO octet sequence
extensions to preserve the buffer after the upcall.
</TD>
</TR>
<TR>
<TD><CODE>-ORBReactorRegistry</CODE> <EM>registry_type</EM></TD>
<TD><a name="-ORBReactorRegistry"></a>
This option is no longer supported. The Advanced Resource
Factory will show an error if you attempt its use.
</TD>
</TR>
</TABLE>
</P>
</blockquote>
<HR><H3><A NAME="RT_ORB_Loader"></A><CODE>RT_ORB_Loader</CODE></H3>
<BLOCKQUOTE>
Typically, the following options are set via the service configurator
(svc.conf) file. The following line in the svc.conf file (all in one line)
<p><code>static RT_ORB_Loader "[list of options]"</code></p>
would load all the options listed within "".
<P><TABLE BORDER="2" CELLSPACING="2" CELLPADDING="0" >
<TR>
<TH>Option</TH>
<TH>Description</TH>
</TR>
<TR>
<TD><CODE>-ORBSchedPolicy</CODE> <EM>policy</EM></TD>
<TD><a name="-ORBSchedPolicy"></a>
Specify the scheduling policy used for the priority mapping
computations and to specify the scheduling policy used when
creating RTCORBA threads.
Priority mappings map the CORBA priority range (from 0 to 32767)
into the native OS priority range, but in some operating systems
the range depends on the scheduling policy used.
Valid values are <B>SCHED_OTHER</B>, <B>SCHED_FIFO</B> and
<B>SCHED_RR</B>. Defaults to <B>SCHED_OTHER</B>. Note that in
some operating systems some of
the scheduling policies require super user privileges.
</TD>
</TR>
<TR>
<TD><CODE>-ORBScopePolicy</CODE> <EM>scope</EM></TD>
<TD><a name="-ORBScopePolicy"></a>
Specify the scheduling scope used when creating RTCORBA threads.
Valid values are: <B>PROCESS</B> and <B>SYSTEM</B>. Defaults to
<B>PROCESS</B>.
</TD>
</TR>
<TR>
<TD><CODE>-ORBPriorityMapping</CODE> <EM>mapping_type</EM></TD>
<TD><a name="-ORBPriorityMapping"></a>
Select the priority mapping to use. There are three priority
mappings provided by TAO: the <B>linear</B> mapping maps between
the CORBA range of priorities and the native range of
priorities; the <B>direct</B> mapping maps CORBA priorities
directly to native priorities; and the <B>continuous</B> maps
the first <i>n</i> CORBA priorities to the range of native
priorities, where <i>n</i> is the number of native priorities.
Defaults to <B>direct</B>. Note that <B>continuous</B> was
previously referred to as <B>direct</B>.
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</blockquote>
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