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|
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<title>Real-Time Event Channel Configuration</title>
<!-- $Id$-->
</head>
<body>
<CENTER>
<h1>Real-Time Event Channel Configuration</h1>
</CENTER>
<H3>Configuring the Event Channel at Compilation Time</H3>
<P>TAO's Real-Time Event Channel can be configured at compilation
time to use a different payload than its default. To do so
there are several options:
</P>
<UL>
<LI><P>To eliminate the <CODE>CORBA::Any</CODE> field in the
event payload you should define the
<CODE>TAO_LACKS_EVENT_CHANNEL_ANY</CODE>
macro when invoking the IDL compiler.
You can do as follows:
<PRE>
$ cd $TAO_ROOT/orbsvcs/orbsvcs
$ make TAO_IDLFLAGS=-DTAO_LACKS_EVENT_CHANNEL_ANY
</PRE>
</P>
</LI>
<LI><P>Similarly you can eliminate the octet sequence field in
the event payload using:
<PRE>
$ cd $TAO_ROOT/orbsvcs/orbsvcs
$ make TAO_IDLFLAGS=-DTAO_LACKS_EVENT_CHANNEL_OCTET_SEQUENCE
</PRE>
</P>
</LI>
<LI><P>Finally you can provide your own event payload, to do
this you should Replace the contents of the
<CODE>RtecDefaultEventData.idl</CODE>
and define some IDL structure named
<CODE>RtecEventData</CODE>.
For example, you could define you own event type as follows:
<PRE>
// Replace RtecDefaultEventData.idl with this:
struct RtecEventData
{
sequence<long> my_event_payload;
};
</PRE>
</LI>
</UL>
<H3>Run-time Configuration</H3>
<P>The new implementation of the real-time event channel uses a
factory to build all the objects and strategies it requires.
The factory can be dynamically loaded using ACE Service
Configurator, this is extremely convenient because the factory
can also parse options in the Service Configurator script file.
</P>
<P>There are currently four implementations of the factory. The
table below describes all of the options (and values) supported by
these factories. The <em>default</em> factory supports all of
the options below and most of the potential values, except as
specifically indicated.
The <em>sched</em> factory defines new option values as indicated
below that allow the RTES to integrate with the Real-Time
Scheduling Service. Use of the <em>sched</em> factory requires
that you link in the TAO_RTSchedEvent library.
The <em>basic</em> and <em>null</em> factories are hard-coded
factories that do not support any configuration options.
They both define simple configurations that may enable some
applications to use the RTES in a smaller footprint.
See the files
<code>$TAO_ROOT/orbsvcs/orbsvcs/Event/EC_Null_Factory.h</code>
and <code>$TAO_ROOT/orbsvcs/orbsvcs/Event/EC_Basic_Factory.h</code>
for details.
</P>
<H3>The configuration file</H3>
<P>The real-time event channel uses the same service configurator
file that the ORB uses, the default name for this file is
<CODE>svc.conf</CODE>, but the ORB option
<CODE>-ORBSvcConf</CODE> can be used to override this.
The format of the file is described in detail in
the service configurator documentation, but the relevant section
for the event channel looks like this:
</P>
<PRE>
# Comments go here...
# More comments if you want to...
static EC_Factory "-ECFiltering basic ....."
</PRE>
<P>All the event service factory options start with
<CODE>-EC</CODE></P>
<H3>The options</H3>
<P><TABLE BORDER="2" CELLSPACING="2" CELLPADDING="0">
<TR>
<TH>Option</TH>
<TH>Description</TH>
</TR>
<!-- <TR NAME="ECDispatching"> -->
<TR>
<TD><CODE>-ECDispatching</CODE>
<EM>dispatching_strategy</EM>
</TD>
<TD>Select the dispatching strategy used by the real-time
event service. The <EM>reactive</EM> strategy uses the
same thread that received the event from the supplier to
push the event to all the consumers.
The <EM>priority</EM> strategy (sched factory only) uses
a prioritized pool
of threads and queries the scheduling service to select
the thread that dispatches each event.
The <EM>mt</EM> strategy also uses a pool of threads,
but the thread to dispatch is randomly selected.
</TD>
</TR>
<!-- <TR NAME="ECDispatchingThreads"> -->
<TR>
<TD><CODE>-ECDispatchingThreads</CODE>
<EM>number_of_threads</EM>
</TD>
<TD>Select the number of threads used by the <EM>mt</EM>
dispatching strategy.
</TD>
</TR>
<!-- <TR NAME="ECFiltering"> -->
<TR>
<TD><CODE>-ECFiltering</CODE>
<EM>consumer_filtering_strategy</EM>
</TD>
<TD>Select the filtering strategy used by the consumers.
The <EM>null</EM> filtering strategy will build trivial
filters for all consumers.
The <EM>basic</EM> filtering strategy supports
disjunction, conjunction, logical and, negation, bitmask,
and timeout filters based on the subscriptions passed by
the consumer during the connect call. It only supports limited
nesting of filter groups.
The <EM>prefix</EM> filtering strategy supports
all filter types that the <EM>basic</EM> strategy does
and allows unlimited nesting of filter groups.
When using the <EM>prefix</EM> strategy, the source field of the
group filter must specify the number of children in the group.
The <EM>priority</EM> filtering strategy (sched factory only)
supports the same
features as the <EM>basic</EM> filtering strategy, but it
also collaborates with the scheduling service to build the
dependency graph.
</TD>
</TR>
<!-- <TR NAME="ECSupplierFiltering"> -->
<TR>
<TD><CODE>-ECSupplierFiltering</CODE>
<EM>supplier_filtering_strategy</EM>
</TD>
<TD>The event channel can also perform some filtering close
to the suppliers by minimizing the number of consumers
that are tested for given event.
If the strategy is <EM>null</EM> then a global collection
of consumers is maintained and each event is filtered by
each consumer.
If the strategy is <EM>per-supplier</EM> then the EC uses
the supplier publications and the consumer subscriptions
to determine which consumers could potentially be
interested in events for each supplier.
This set of consumers is usually smaller than the complete
set and it is thus faster to traverse it, but keeping more
collections of consumers increases the connection and
disconnection time as well as the memory requirements.
</TD>
</TR>
<!-- <TR NAME="ECTimeout"> -->
<TR>
<TD><CODE>-ECTimeout</CODE>
<EM>timeout_strategy</EM>
</TD>
<TD>A consumer can request that the event channel generate
periodic or oneshot timeout events.
This option controls the strategy to generate the
timeouts,
using <EM>reactive</EM> the same reactor used for the ORB
is used by the event service.
The <EM>priority</EM> strategy (sched factory only) uses a
prioritized group of
threads, timeouts with higher rate are generated by
threads of higher priority.
<BR><B>NOTE: The <EM>priority</EM> strategy is not
implemented</B>
</TD>
</TR>
<!-- <TR NAME="ECObserver"> -->
<TR>
<TD><CODE>-ECObserver</CODE>
<EM>observer</EM>
</TD>
<TD>The event channel uses the Observer pattern to report
changes in the subscriptions and publications of its
suppliers and consumers; this is especially useful in the
implementation of event channel gateways.
The user can disable this feature by selecting the
<EM>null</EM> strategy;
whereas the <EM>basic</EM> strategy provides a simple, yet
efficient implementation. <EM>reactive</EM> provides a
strategy in which an observer that is unreachable is removed
from the observer list.
<BR><B>NOTE:<B> The default is to have the feature disabled.
</TD>
</TR>
<!-- <TR NAME="ECScheduling"> -->
<TR>
<TD><CODE>-ECScheduling</CODE>
<EM>scheduling_strategy</EM>
</TD>
<TD>The event channel can collaborate with the scheduling
service to build the dependency list between the consumers
and the suppliers.
If the <EM>null</EM> scheduling strategy is selected this
feature is disabled,
the <EM>priority</EM> strategy (sched factory only) enables this feature.
<BR><B>NOTE:<B> The default is to have the feature disabled.
</TD>
</TR>
<!-- <TR NAME="ECProxyConsumerLock"> -->
<TR>
<TD><CODE>-ECProxyConsumerLock</CODE>
<EM>lock_type</EM>
</TD>
<TD>Select the lock type (<EM>null</EM>, <EM>thread</EM> or
<EM>recursive</EM>) to synchronize access to the
ProxyPushConsumer state.
</TD>
</TR>
<!-- <TR NAME="ECProxySupplierLock"> -->
<TR>
<TD><CODE>-ECProxySupplierLock</CODE>
<EM>lock_type</EM>
</TD>
<TD>Select the lock type (<EM>null</EM>, <EM>thread</EM> or
<EM>recursive</EM>) to synchronize access to the
ProxyPushSupplier state.
</TD>
</TR>
<!-- <TR NAME="ECUseORBId"> -->
<TR>
<TD><CODE>-ECUseORBId</CODE>
<EM>orbid</EM>
</TD>
<TD>Set the name of the ORB used by the event service, only
useful in applications that create multiple ORBs and
activate the event service in one of them.
</TD>
</TR>
<!-- <TR NAME="ECConsumerControl"> -->
<TR>
<TD><CODE>-ECConsumerControl</CODE>
<EM>policy</EM>
</TD>
<TD>Select the consumer control policy (<EM>null</EM> or
<EM>reactive</EM>) to detect and discard broken consumers.
</TD>
</TR>
<!-- <TR NAME="ECSupplierControl"> -->
<TR>
<TD><CODE>-ECSupplierControl</CODE>
<EM>policy</EM>
</TD>
<TD>Select the supplier control policy (<EM>null</EM> or
<EM>reactive</EM>) to detect and discard broken suppliers.
</TD>
</TR>
<!-- <TR NAME="ECConsumerControlPeriod"> -->
<TR>
<TD><CODE>-ECConsumerControlPeriod</CODE>
<EM>period</EM>
</TD>
<TD>Set the period (in microseconds) used by the reactive
consumer control policy (set <EM>ECConsumerControl</EM> to
<EM>reactive</EM>) to poll the state of the consumers.
When set to 0 there is no polling but the
reactive strategy is in place.
</TD>
</TR>
<!-- <TR NAME="ECSupplierControlPeriod"> -->
<TR>
<TD><CODE>-ECSupplierControlPeriod</CODE>
<EM>period</EM>
</TD>
<TD>Set the period (in microseconds) used by the reactive
supplier control policy (set <EM>ECSupplierControl</EM> to
<EM>reactive</EM>) to poll the state of the suppliers.
When set to 0 there is no polling but the
reactive strategy is in place.
</TD>
</TR>
<!-- <TR NAME="ECConsumerControlTimeout"> -->
<TR>
<TD><CODE>-ECConsumerControlTimeout</CODE>
<EM>timeout</EM>
</TD>
<TD>Set the timeout period (in microseconds) used by the reactive
consumer control policy (set <EM>ECConsumerControl</EM> to
<EM>reactive</EM>) to detect a timeout when polling the state
of the consumers.
</TD>
</TR>
<!-- <TR NAME="ECSupplierControlTimeout"> -->
<TR>
<TD><CODE>-ECSupplierControlTimeout</CODE>
<EM>timeout</EM>
</TD>
<TD>Set the timeout period (in microseconds) used by the reactive
supplier control policy (set <EM>ECSupplierControl</EM> to
<EM>reactive</EM>) to detect a timeout when polling the state
of the suppliers.
</TD>
</TR>
<!-- <TR NAME="ECProxyPushConsumerCollection"> -->
<TR>
<TD><CODE>-ECProxyPushConsumerCollection</CODE>
<EM>flag[:flags]</EM>
</TD>
<TD><P>Configure the data structure and strategies used to
implement collections of
<CODE>ProxyPushConsumers</CODE>.
The argument is a colon separated list of flags, with
the following semantics:
<TABLE BORDER="1" CELLSPACING="2" CELLPADDING="0">
<TR><TH>Flag</TH><TH>Description</TH>
</TR>
<TR>
<TD>MT</TD>
<TD>Use regular mutexes and/or condition
variables for serialization.
</TD>
</tr>
<TR>
<TD>ST</TD>
<TD>Use null mutexes and/or condition
variables for serialization.
</TD>
</tr>
<TR>
<TD>LIST</TD>
<TD>Implement the collection using an ordered list,
fast for iteration (i.e. during event dispatching),
but slow for insertion and removal (i.e. when
clients connect and disconnect from the EC).
</TD>
</tr>
<TR>
<TD>RB_TREE</TD>
<TD>Implement the collection using a Red-Black tree,
slow for iteration (i.e. during event dispatching),
but fast for insertion and removal (i.e. when
clients connect and disconnect from the EC).
</TD>
</tr>
<TR>
<TD>IMMEDIATE</TD>
<TD>Threads block until they can execute a change on
the data structure, the system must use other
approaches to guarantee that the iterators are not
invalidated during event dispatching. For example,
use a separate dispatching thread. Using this option
with the reactive values for any of the
-ECSupplierControl, -ECConsumerControl, or
-ECDispatching options may cause deadlocks.
</TD>
</tr>
<TR>
<TD>COPY_ON_READ</TD>
<TD>Before initiating an iteration to dispatch events
(or similar tasks) a copy of the complete collection
is performed.
This solves most of the synchronization problems,
but introduces a significant source of overhead and
priority inversions on the critical path.
</TD>
</tr>
<TR>
<TD>COPY_ON_WRITE</TD>
<TD>Similar to the previous one, but the copy is only
performed when needed.
</TD>
</tr>
<TR>
<TD>DELAYED</TD>
<TD>Threads that need to change the collection can
detect if that change will invalidate iterators used
by other threads.
If so, the thread posts the change on a queue that
is executed once the collection is no longer in
use.
</TD>
</TR>
</TABLE>
</P>
</TD>
</TR>
<!-- <TR NAME="ECProxyPushSupplierCollection"> -->
<TR>
<TD><CODE>-ECProxyPushSupplierCollection</CODE>
<EM>flag[:flags]</EM>
</TD>
<TD><P>Configure the data structure and strategies used to
implement collections of <CODE>ProxyPushSupplier</CODE>
objects.
Use the same arguments as with the
<CODE>ECProxyPushConsumerCollection</CODE> option.
</P>
</TD>
</TR>
<!-- <TR NAME="ECPushSupplierSet"> -->
<TR>
<TD><CODE>-ECPushSupplierSet</CODE>
</TD>
<TD><P>Obsolete option, ignored.
</P>
</TD>
</TR>
<!-- <TR NAME="ECConsumerAdminLock"> -->
<TR>
<TD><CODE>-ECConsumerAdminLock</CODE>
</TD>
<TD>Obsolete option, ignored in the current version.
</TD>
</TR>
<!-- <TR NAME="ECSupplierAdminLock"> -->
<TR>
<TD><CODE>-ECSupplierAdminLock</CODE>
</TD>
<TD>Obsolete option, ignored in the current version.
</TD>
</TR>
<!-- <TR NAME="ECConsumerValidateConnection"> -->
<TR>
<TD><CODE>-ECConsumerValidateConnection</CODE>
<EM>validate_connection: 0 | 1</EM>
</TD>
<TD>When this option is set the connection from the Event Channel
to the consumer will be created during the connect of the
consumer, just before the consumer is added to the consumer
list. By default
the Event Channel will create the connection to the consumer at
the moment the first event is pushed to the consumer.
When the network is heavily loaded during this connect and a new event
is pushed before the connection is establed, a new create connection
request is done. When having very high connection establishment
time (for example running on a WAN) and an interval that is much
smaller than the connection establishment time it is wise to
set this option. Else you get dozens of new connection request
that can result in a stack overflow. Another option is to use BiDIR
GIOP so that there is only one connection between Rtec and consumer
but for this the Rtec and the consumer must be changed to set the
BiDIR Policy, this is not implemented at this moment.
</TD>
</TR>
</TABLE>
</P>
<H3>The constructor</H3>
<P>The <CODE>TAO_EC_Event_Channel</CODE> class implements the
<CODE>RtecEventChannelAdmin::EventChannel</CODE> interface;
this class takes one mandatory and two optional parameters in
its constructor:
</P>
<PRE>
TAO_EC_Event_Channel (const TAO_EC_Event_Channel_Attributes& attributes,
TAO_EC_Factory* factory = 0,
int own_factory = 0);
</PRE>
<P>The <CODE>factory</CODE> is an optional parameter to override
the default strategy factory used by the event channel,
the event channel will destroy the factory if the
<CODE>own_factory</CODE> argument is true.
</P>
<P>The <CODE>attributes</CODE> parameter can be used to fine tune
some of the algorithms and strategies used by the event channel,
the default values are probably OK for most applications.
Notice that the attributes include the POA used to activate the
ConsumerAdmin, SupplierAdmin, ProxyPushConsumer and
ProxyPushSupplier objects;
these POAs must have the <CODE>IMPLICIT_ACTIVATION</CODE> and the
<CODE>SYSTEM_ID</CODE> policies (as the RootPOA does).
</P>
<P><TABLE BORDER="2" CELLSPACING="2" CELLPADDING="0">
<TR><TH>Attribute</TH><TH>Description</TH></TR>
<TR><TD><CODE>consumer_reconnect</CODE></TD>
<TD>If the attribute is not zero then the same consumer can
call <CODE>connect_push_consumer</CODE> on its
ProxyPushSupplier multiple times to change its
subscriptions;
this is usually more efficient that disconnecting and
connecting again.
</TD>
</TR>
<TR><TD><CODE>supplier_reconnect</CODE></TD>
<TD>If the attribute is not zero then the same supplier can
call <CODE>connect_push_supplier</CODE> on its
ProxyPushConsumer multiple times to change its
publications;
this is usually more efficient that disconnecting and
connecting again.
</TD>
</TR>
<TR><TD><CODE>busy_hwm</CODE></TD>
<TD>When the delayed flag is set on proxy collections,
this flag controls the maximum
number of threads that can simultaneously iterate over the
collection before blocking.
It can be used to avoid starvation in delayed updates on
the collection.
</TD>
</TR>
<TR><TD><CODE>max_write_delay</CODE></TD>
<TD>When the delayed flag is set on proxy collections,
this flag controls the maximum
number of threads that will initiate dispatching
<B>after</B> a change has been posted.
Any thread after that is blocked until the operations are
performed.
It can be used to completely stop starvation of delayed
updates on the collection.
</TD>
</TR>
<TR><TD><CODE>scheduler</CODE></TD>
<TD>Most configurations of the real-time event channel do
not require an scheduler.
If any of the strategies that require an scheduling
service is selected then this attribute should be set
appropiately.
</TD>
</TR>
<TR><TD><CODE>supplier_poa</CODE></TD>
<TD>The POA used by the event channel to activate SupplierAdmin
and SupplierProxy objects.
</TD>
</TR>
<TR><TD><CODE>consumer_poa</CODE></TD>
<TD>The POA used by the event channel to activate ConsumerAdmin
and ConsumerProxy objects.
</TD>
</TR>
<TR><TD><CODE>disconnect_callbacks</CODE></TD>
<TD>If not zero, then the event channel sends disconnect
callbacks when a disconnect method is called on a Proxy.
For example, if a consumer calls
disconnect_push_supplier() on its proxy the EC
invokes disconnect_push_consumer() on the consumer.
An analogous call is also made for suppliers when this
attribute is set.
By default, these callbacks are not made in this situation.
</TD>
</TR>
</TABLE>
</P>
<H3>Configuring the IIOP Gateway</H3>
<P>The <CODE>TAO_EC_Gateway_IIOP_Factory</CODE> is the factory for
the <CODE>TAO_EC_Gateway_IIOP</CODE> class. This factory can be
used to configure the settings of the IIOP Gateway using the
svc.conf file. The contents looks like this:
</P>
<PRE>
# Comments go here...
# More comments if you want to...
static EC_Gateway_IIOP_Factory "-ECGIIOPConsumerECControl null ....."
</PRE>
<P>All the IIOP Gateway factory options start with
<CODE>-ECGIIOP</CODE></P>
<P><TABLE BORDER="2" CELLSPACING="2" CELLPADDING="0">
<TR>
<TH>Option</TH>
<TH>Description</TH>
</TR>
<!-- <TR NAME="ECGIIOPConsumerECControl"> -->
<TR>
<TD><CODE>-ECGIIOPConsumerECControl</CODE>
<EM>policy</EM>
</TD>
<TD>Select the consumer ec control policy (<EM>null</EM> or
<EM>reactive</EM> or <EM>reconnect</EM>) to detect and handle
broken consumer ec's.
</TD>
</TR>
<!-- <TR NAME="ECGIIOPConsumerECControlPeriod"> -->
<TR>
<TD><CODE>-ECGIIOPConsumerECControlPeriod</CODE>
<EM>period</EM>
</TD>
<TD>Set the period (in microseconds) used by the reactive and reconnect
consumer ec control policy (set <EM>ECGIIOPConsumerECControl</EM> to
<EM>reactive</EM> or <EM>reconnect</EM>) to poll the state of the consumer ec.
When set to 0 there is no polling but the
reactive strategy is in place.
</TD>
</TR>
<!-- <TR NAME="ECGIIOPConsumerECControlTimeout"> -->
<TR>
<TD><CODE>-ECGIIOPConsumerECControlTimeout</CODE>
<EM>timeout</EM>
</TD>
<TD>Set the timeout period (in microseconds) used by the reactive and reconnect
consumer ec control policy (set <EM>ECGIIOPConsumerECControl</EM> to
<EM>reactive</EM> or <EM>reconnect</EM>) to detect a timeout when polling the state
of the consumer ec.
</TD>
</TR>
<!-- <TR NAME="ECGIIOPUseORBId"> -->
<TR>
<TD><CODE>-ECGIIOPUseORBId</CODE>
<EM>orbid</EM>
</TD>
<TD>Set the name of the ORB used by the event gateway, only
useful in applications that create multiple ORBs and
activate the gateway in one of them.
</TD>
</TR>
<!-- <TR NAME="ECGIIOPUseTTL"> -->
<TR>
<TD><CODE>-ECGIIOPUseTTL</CODE>
<EM>use_ttl: 0 | 1</EM>
</TD>
<TD>Set whether the IIOP Gateway uses the TTL or not.
This is 1 by default. When set to 0 make sure that
no recursive structure is build between ec's, else an
event can keep looping for ever. Useful when there are no
recursive structures and we want the gateway to
transfer all events independent of their TTL because suppliers
can be unaware about the maximum number of hops. In case
this option is 0, the TTL in the event isn't decremented
by the gateway also.
</TD>
</TR>
<!-- <TR NAME="ECGIIOPUseConsumerProxyMap"> -->
<TR>
<TD><CODE>-ECGIIOPUseConsumerProxyMap</CODE>
<EM>use_consumer_proxy_map: 0 | 1</EM>
</TD>
<TD>Set whether the IIOP Gateway uses a map with a proxy
push consumer for each unique source id or not. This is 1
by default meaning that a map is used. When set to 0 the
gateway will just use one proxy push consumer to push
events to the consumer ec. This options is useful when
a lot of different source id's are used but there is no
need for a different proxy push consumer for each source id.
Setting this option to 0 then improves the performance.
</TD>
</TR>
</TABLE>
</P>
<P><HR><P>
Back to the TAO <A HREF="index.html">components documentation</A>.
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<address><a href="mailto:coryan@cs.wustl.edu">Carlos O'Ryan</a></address>
<!-- Created: Thu Jul 1 21:44:28 CDT 1999 -->
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Last modified: Fri Aug 08 08:39:42 CDT 2003
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