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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Future_Set.h
//
// = AUTHOR (S)
// John Tucker <jtucker@infoglide.com>
//
// ============================================================================
#ifndef ACE_FUTURE_SET_H
#define ACE_FUTURE_SET_H
#include "ace/pre.h"
#include "ace/Thread.h"
#include "ace/Message_Queue.h"
#include "ace/Future.h"
#include "ace/Hash_Map_Manager.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
#pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#if defined (ACE_HAS_THREADS)
template <class T>
class ACE_Future_Set : public ACE_Future_Observer<T>
{
// = TITLE
// This class implements a mechanism which allows the values of
// a collections of <ACE_Future> objects to be accessed by
// reader threads as they become available.
public:
// = Initialization and termination methods.
ACE_Future_Set (ACE_Message_Queue<ACE_SYNCH> *future_notification_queue_ = 0);
// Constructor.
~ACE_Future_Set (void);
// Destructor.
int is_empty (void) const;
// Return 1 if their are no <ACE_Future> objects left on its queue and
// 0 otherwise
int insert (ACE_Future<T> &future);
// Enqueus the given <ACE_Future> into this objects queue when it is
// readable.
//
// Returns 0 if the future is successfully inserted, 1 if the
// future is already inserted, and -1 if failures occur.
int next_readable (ACE_Future<T> &result,
ACE_Time_Value *tv = 0);
// Wait up to <tv> time to get the <value>. Note that <tv> must be
// specified in absolute time rather than relative time.); get the
// next <ACE_Future> that is readable. If <tv> = 0, the will block
// forever.
//
// If a readable future becomes available, then the input result
// will be assigned with it and 1 will will be returned. If the set
// is empty, then 0 is returned.
virtual void update (const ACE_Future<T> &future);
// Called by the <ACE_Future> subject in which we are subscribed to
// when its value is written to.
ACE_ALLOC_HOOK_DECLARE;
// Declare the dynamic allocation hooks.
private:
// = Disallow these operations.
ACE_UNIMPLEMENTED_FUNC (void operator= (const ACE_Future_Set<T> &))
ACE_UNIMPLEMENTED_FUNC (ACE_Future_Set (const ACE_Future_Set<T> &))
typedef ACE_Future<T> FUTURE;
typedef ACE_Future_Rep<T> FUTURE_REP;
typedef ACE_Future_Holder<T> FUTURE_HOLDER;
typedef ACE_Pointer_Hash<FUTURE_REP *> FUTURE_REP_HASH;
typedef ACE_Equal_To<FUTURE_REP *> FUTURE_REP_COMPARE;
typedef ACE_Hash_Map_Manager_Ex<FUTURE_REP *,
FUTURE_HOLDER *,
FUTURE_REP_HASH,
FUTURE_REP_COMPARE,
ACE_Null_Mutex> FUTURE_HASH_MAP;
FUTURE_HASH_MAP future_map_;
// Map of <ACE_Futures>, subjects, which have not been written to by
// client's writer thread.
ACE_Message_Queue<ACE_SYNCH> *future_notification_queue_;
// Message queue for notifying the reader thread of <ACE_Futures> which
// have been written to by client's writer thread.
int delete_queue_;
// Keeps track of whether we need to delete the message queue.
};
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Future_Set.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Future_Set.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#endif /* ACE_HAS_THREADS */
#include "ace/post.h"
#endif /* ACE_FUTURE_SET_H */
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