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/* -*- C++ -*- */
// $Id$
//
// ============================================================================
//
// = LIBRARY
// ORBSVCS Real-time Event Channel
//
// = FILENAME
// EC_ConsumerAdmin_T
//
// = AUTHOR
// Carlos O'Ryan (coryan@cs.wustl.edu)
//
// = DESCRIPTION
// Implement concrete versions of the EC_ConsumerAdmin class. This
// concrete versions provide specific locking policies and
// strategies to handle delayed vs. immediate connections and
// disconnections.
//
// = CREDITS
// Based on previous work by Tim Harrison (harrison@cs.wustl.edu)
// and other members of the DOC group.
// More details can be found in:
// http://www.cs.wustl.edu/~schmidt/oopsla.ps.gz
// http://www.cs.wustl.edu/~schmidt/JSAC-98.ps.gz
//
//
// ============================================================================
#ifndef TAO_EC_CONSUMERADMIN_T_H
#define TAO_EC_CONSUMERADMIN_T_H
#include "EC_ConsumerAdmin.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
template<ACE_SYNCH_DECL>
class TAO_EC_ConsumerAdmin_T : public TAO_EC_ConsumerAdmin
{
// = TITLE
// ConsumerAdmin_T
//
// = DESCRIPTION
// Implements the locking policies for the TAO_EC_ConsumerAdmin
// class, we use a parametric class to handle the co-variations
// between mutexes and condition variables.
//
// = MEMORY MANAGMENT
//
// = LOCKING
// The kind of locking is specified as the template argument.
// Clients still should follow the locking protocol: call busy()
// to use the iterator and idle() once finished, the
// Busy_Lock_Adapter can help there.
//
// = TODO
//
public:
TAO_EC_ConsumerAdmin_T (TAO_EC_Event_Channel* event_channel);
// constructor...
// = The TAO_EC_ConsumerAdmin methods
virtual int busy (void);
virtual int idle (void);
protected:
virtual int busy_i (void);
// Implements the busy() method, but without locking.
virtual int idle_i (void);
// Implements the busy() method, but without locking.
protected:
int busy_count (void) const;
// Return the current value of busy_count [derived classes are not
// allowed to modify this]
ACE_SYNCH_MUTEX_T lock_;
// The lock
ACE_SYNCH_CONDITION_T busy_cond_;
// A condition variable to wait while the object is too busy.
private:
int busy_count_;
// The number of threads iterating on us
int reached_hwm_;
// The set was too busy and reached its HWM, now everybody has to
// wait until we reach the LWM (0)
};
// ****************************************************************
template<ACE_SYNCH_DECL>
class TAO_EC_ConsumerAdmin_Immediate : public TAO_EC_ConsumerAdmin_T<ACE_SYNCH_USE>
{
// = TITLE
// ConsumerAdmin_Immediate
//
// = DESCRIPTION
// A concrete version of the EC_ConsumerAdmin class; using the
// locking strategy in EC_ConsumerAdmin_T and immediate execution
// for the connected() and disconnected() operations.
//
// = MEMORY MANAGMENT
//
// = LOCKING
// The kind of locking is specified as the template argument.
// Clients still should follow the locking protocol: call busy()
// to use the iterator and idle() once finished, the
// Busy_Lock_Adapter can help there.
//
// = TODO
//
public:
TAO_EC_ConsumerAdmin_Immediate (TAO_EC_Event_Channel* event_channel);
// constructor...
// = The TAO_EC_ConsumerAdmin methods
virtual void connected (TAO_EC_ProxyPushSupplier*,
CORBA::Environment&);
virtual void disconnected (TAO_EC_ProxyPushSupplier*,
CORBA::Environment&);
};
// ****************************************************************
template<ACE_SYNCH_DECL>
class TAO_EC_ConsumerAdmin_Delayed : public TAO_EC_ConsumerAdmin_T<ACE_SYNCH_USE>
{
// = TITLE
// ConsumerAdmin_Delayed
//
// = DESCRIPTION
// A concrete version of the EC_ConsumerAdmin class; using the
// locking strategy in EC_ConsumerAdmin_T and storing the
// execution of connected() and disconnected() operations as
// command objects, that are executed once the set is idle.
//
// = MEMORY MANAGMENT
//
// = LOCKING
// The kind of locking is specified as the template argument.
// Clients still should follow the locking protocol: call busy()
// to use the iterator and idle() once finished, the
// Busy_Lock_Adapter can help there.
//
// = TODO
//
public:
TAO_EC_ConsumerAdmin_Delayed (TAO_EC_Event_Channel* event_channel);
// constructor...
// = The TAO_EC_ConsumerAdmin methods
virtual void connected (TAO_EC_ProxyPushSupplier*,
CORBA::Environment&);
virtual void disconnected (TAO_EC_ProxyPushSupplier*,
CORBA::Environment&);
protected:
virtual void execute_delayed_operations (void);
// documented in TAO_EC_ConsumerAdmin
private:
ACE_Unbounded_Queue<ACE_Command_Base*> command_queue_;
// The commands that carry the delayed operations are enqueued
// here.
};
// ****************************************************************
#if defined (__ACE_INLINE__)
#include "EC_ConsumerAdmin_T.i"
#endif /* __ACE_INLINE__ */
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "EC_ConsumerAdmin_T.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("EC_ConsumerAdmin_T.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#endif /* TAO_EC_CONSUMERADMIN_T_H */
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