EC_Reactive_SupplierControl.h

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// -*- C++ -*-

/**
 *  @file   EC_Reactive_SupplierControl.h
 *
 *  $Id: EC_Reactive_SupplierControl.h 76589 2007-01-25 18:04:11Z elliott_c $
 *
 *  @author Carlos O'Ryan (coryan@cs.wustl.edu)
 *
 * 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://doc.ece.uci.edu/~coryan/EC/index.html
 */

#ifndef TAO_EC_REACTIVE_SUPPLIERCONTROL_H
#define TAO_EC_REACTIVE_SUPPLIERCONTROL_H

#include /**/ "ace/pre.h"

#include "orbsvcs/Event/EC_SupplierControl.h"

#include "orbsvcs/ESF/ESF_Worker.h"

#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */

#include "tao/ORB.h"
#include "tao/PolicyC.h"

#include "ace/Event_Handler.h"

TAO_BEGIN_VERSIONED_NAMESPACE_DECL

class TAO_EC_Event_Channel_Base;

class TAO_EC_Reactive_SupplierControl;

/**
 * @class TAO_EC_SupplierControl_Adapter
 *
 * @brief Forwards timeout events to the Reactive SupplierControl
 *
 * The Reactive SupplierControl strategy uses the reactor to
 * periodically wakeup and verify the state of the suppliers
 * registered with the Event Channel.
 *
 * @todo Marina Spivak made the following observation: these classes
 * and implementation seem nearly identical to those in
 * EC_Reactive_ConsumerControl.*  The only differences are using
 * consumer_admin collection vs supplier_admin, and calling
 * disconnect_push_consumer vs disconnect_push_supplier ...  Seems
 * like it may be a good idea to change some naming and templatize...
 * @todo The same templates should be used for the Notification and
 * COS Event services.
 *
 */
class TAO_RTEvent_Serv_Export TAO_EC_SupplierControl_Adapter : public ACE_Event_Handler
{
public:
  /// Constructor
  TAO_EC_SupplierControl_Adapter (TAO_EC_Reactive_SupplierControl *adaptee);

  // = Documented in ACE_Event_Handler.
  virtual int handle_timeout (const ACE_Time_Value &tv,
                              const void *arg = 0);

private:
  /// The adapted object
  TAO_EC_Reactive_SupplierControl *adaptee_;
};

/**
 * @class TAO_EC_Reactive_SupplierControl
 *
 * @brief SupplierControl
 *
 * Defines the interface for the supplier control strategy.
 * This strategy handles misbehaving or failing suppliers.
 */
class TAO_RTEvent_Serv_Export TAO_EC_Reactive_SupplierControl : public TAO_EC_SupplierControl
{
public:
  /// Constructor.  It does not assume ownership of the @a event_channel
  /// parameter.
  TAO_EC_Reactive_SupplierControl (const ACE_Time_Value &rate,
                                   const ACE_Time_Value &timeout,
                                   TAO_EC_Event_Channel_Base *event_channel,
                                   CORBA::ORB_ptr orb);

  /// Destructor.
  virtual ~TAO_EC_Reactive_SupplierControl (void);

  /// Receive the timeout from the adapter
  void handle_timeout (const ACE_Time_Value &tv,
                       const void* arg);

  // = Documented in TAO_EC_SupplierControl
  virtual int activate (void);
  virtual int shutdown (void);
  virtual void supplier_not_exist (TAO_EC_ProxyPushConsumer *proxy);
  virtual void system_exception (TAO_EC_ProxyPushConsumer *proxy,
                                 CORBA::SystemException &);

private:
  /// Check if the suppliers still exists.  It is a helper method for
  /// handle_timeout() to isolate the exceptions.
  void query_suppliers (void);

private:
  /// The polling rate
  ACE_Time_Value rate_;

  /// The polling timeout
  ACE_Time_Value timeout_;

  /// The Adapter for the reactor events
  TAO_EC_SupplierControl_Adapter adapter_;

  /// The event channel
  TAO_EC_Event_Channel_Base *event_channel_;

  /// The ORB
  CORBA::ORB_var orb_;

  /// To control the timeout policy in the thread
  CORBA::PolicyCurrent_var policy_current_;

  /// Precomputed policy list to the set timeout.
  CORBA::PolicyList policy_list_;

  /// The ORB reactor
  ACE_Reactor *reactor_;

#if defined (TAO_HAS_CORBA_MESSAGING) && TAO_HAS_CORBA_MESSAGING != 0
  /// The timer id
  long timer_id_;
#endif /* TAO_HAS_CORBA_MESSAGING */
};

// ****************************************************************

class TAO_EC_Ping_Supplier : public TAO_ESF_Worker<TAO_EC_ProxyPushConsumer>
{
public:
  TAO_EC_Ping_Supplier (TAO_EC_SupplierControl *control);

  virtual void work (TAO_EC_ProxyPushConsumer *consumer);

private:
  TAO_EC_SupplierControl *control_;
};

TAO_END_VERSIONED_NAMESPACE_DECL

#if defined (__ACE_INLINE__)
#include "orbsvcs/Event/EC_Reactive_SupplierControl.inl"
#endif /* __ACE_INLINE__ */

#include /**/ "ace/post.h"

#endif /* TAO_EC_SUPPLIERCONTROL_H */

---