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/* -*- C++ -*- */
// $Id$
//
// ============================================================================
//
// = DESCRIPTION
// This test attempts to communicate several Event Channels.
// The test hardcodes all the objects involved (consumers,
// suppliers, proxies, etc.); the objective is to gain understanding
// on the architecture needed to exploit locality in the Event
// cycle, not to provide a definite solution.
//
// ============================================================================
#if !defined (EC_MULTIPLE_H)
#define EC_MULTIPLE_H
#include "ace/SString.h"
#include "orbsvcs/RtecEventChannelAdminC.h"
#include "orbsvcs/RtecEventCommS.h"
#include "orbsvcs/Channel_Clients_T.h"
class EC_Proxy
// = TITLE
// Event Channel Proxy.
//
// = DESCRIPTION
// This class mediates among two event channels, it connects as a
// consumer of events with a remote event channel, and as a supplier
// of events with the local EC.
// As a consumer it gives a QoS designed to only accept the events
// in which *local* consumers are interested.
// Eventually the local EC should create this object and compute its
// QoS in an automated manner; but this requires some way to filter
// out the peers registered as consumers, otherwise we will get
// loops in the QoS graph.
// It uses exactly the same set of events in the publications list
// when connected as a supplier.
//
// = NOTES
// An alternative implementation would be to register with the
// remote EC as a supplier, and then filter on the remote EC, but
// one of the objectives is to minimize network traffic.
// On the other hand the events will be pushed to remote consumers,
// event though they will be dropped upon receipt (due to the TTL
// field); IMHO this is another suggestion that the EC needs to know
// (somehow) which consumers are truly its peers in disguise.
//
// = ALTERNATIVES
// Check http://www.cs.wustl.edu/~coryan/Multiple_EC.html for a
// discussion on that topic.
//
{
public:
EC_Proxy (void);
~EC_Proxy (void);
int open (RtecEventChannelAdmin::EventChannel_ptr remote_ec,
RtecEventChannelAdmin::EventChannel_ptr local_ec,
const RtecEventChannelAdmin::ConsumerQOS& subscriptions,
const RtecEventChannelAdmin::SupplierQOS& publications,
CORBA::Environment &_env);
// Establish the connections.
void disconnect_push_supplier (CORBA::Environment &);
// The channel is disconnecting.
void disconnect_push_consumer (CORBA::Environment &);
// The channel is disconnecting.
void push (const RtecEventComm::EventSet &events,
CORBA::Environment &);
// This is the Consumer side behavior, it pushes the events to the
// local event channel.
private:
ACE_PushConsumer_Adapter<EC_Proxy> consumer_;
ACE_PushSupplier_Adapter<EC_Proxy> supplier_;
RtecEventChannelAdmin::ProxyPushConsumer_var consumer_proxy_;
RtecEventChannelAdmin::ProxyPushSupplier_var supplier_proxy_;
};
class Test_ECP
//
// = TITLE
// A simple test for the EC_Proxy class.
//
// = DESCRIPTION
// This class is design to exercise several features of the EC_Proxy
// class and the multiple EC architecture.
// We want to create two EC, each one having a single supplier and a
// single consumer.
// + To test the remote facilities the consumer register for both a
// local event and a remote one.
// + To test the remote filtering features the remote consumer only
// wants one of the local events, and this event is generated less
// frequently.
//
// This class creates the local ECP a consumer and a supplier, it
// uses the command line to figure the
//
{
public:
Test_ECP (void);
int run (int argc, char* argv[]);
// Execute the test.
void disconnect_push_supplier (CORBA::Environment &);
void disconnect_push_consumer (CORBA::Environment &);
void push (const RtecEventComm::EventSet &events,
CORBA::Environment &);
// Implement the consumer and supplier upcalls.
private:
int parse_args (int argc, char* argv[]);
RtecEventChannelAdmin::EventChannel_ptr
get_ec (CosNaming::NamingContext_ptr naming_context,
const char* ec_name,
CORBA::Environment &_env);
int connect_supplier (RtecEventChannelAdmin::EventChannel_ptr local_ec,
CORBA::Environment &_env);
int connect_consumer (RtecEventChannelAdmin::EventChannel_ptr local_ec,
CORBA::Environment &_env);
int connect_ecp (RtecEventChannelAdmin::EventChannel_ptr local_ec,
RtecEventChannelAdmin::EventChannel_ptr remote_ec,
CORBA::Environment &_env);
private:
ACE_PushConsumer_Adapter<Test_ECP> consumer_;
ACE_PushSupplier_Adapter<Test_ECP> supplier_;
EC_Proxy ecp_;
RtecEventChannelAdmin::ProxyPushConsumer_var consumer_proxy_;
RtecEventChannelAdmin::ProxyPushSupplier_var supplier_proxy_;
RtecEventComm::EventSourceID supplier_id_;
char* rmt_ec_name_;
char* lcl_ec_name_;
int event_a_;
int event_b_;
int event_c_;
int interval_;
};
#endif /* EC_MULTIPLE_H */
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