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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Cached_Connect_Strategy_T.h
//
// = AUTHOR
// Kirthika Parameswaran <kirthika@cs.wustl.edu>
//
// ============================================================================
#ifndef CACHED_CONNECT_STRATEGY_T_H
#define CACHED_CONNECT_STRATEGY_T_H
#include "ace/OS.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
#define ACE_LACKS_PRAGMA_ONCE
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Strategies_T.h"
#include "ace/Hash_Cache_Map_Manager_T.h"
#include "ace/Caching_Strategies_T.h"
#include "ace/Functor_T.h"
#include "ace/Pair_T.h"
#include "ace/Synch.h"
template <class SVC_HANDLER, ACE_PEER_CONNECTOR_1, class CACHING_STRATEGY, class ATTRIBUTES, class MUTEX>
class ACE_Cached_Connect_Strategy_Ex : public ACE_Cached_Connect_Strategy<SVC_HANDLER, ACE_PEER_CONNECTOR_2, MUTEX>
{
// = TITLE
// A connection strategy which caches connections to peers
// (represented by <SVC_HANDLER> instances), thereby allowing
// subsequent re-use of unused, but available, connections.
//
// = DESCRIPTION
// <Cached_Connect_Strategy> is intended to be used as a
// plug-in connection strategy for <ACE_Strategy_Connector>.
// It's added value is re-use of established connections and
// tweaking the role of the cache as per the caching strategy.
public:
ACE_Cached_Connect_Strategy_Ex (ACE_Creation_Strategy<SVC_HANDLER> *cre_s = 0,
ACE_Concurrency_Strategy<SVC_HANDLER> *con_s = 0,
ACE_Recycling_Strategy<SVC_HANDLER> *rec_s = 0,
MUTEX *lock = 0,
int delete_lock = 0);
// Constructor
virtual ~ACE_Cached_Connect_Strategy_Ex (void);
// Destructor
virtual int open (ACE_Creation_Strategy<SVC_HANDLER> *cre_s,
ACE_Concurrency_Strategy<SVC_HANDLER> *con_s,
ACE_Recycling_Strategy<SVC_HANDLER> *rec_s);
// This methods allow you to change the strategies used by the
// cached connector.
virtual int cached_connect (SVC_HANDLER *&sh,
const ACE_PEER_CONNECTOR_ADDR &remote_addr,
ACE_Time_Value *timeout,
const ACE_PEER_CONNECTOR_ADDR &local_addr,
int reuse_addr,
int flags,
int perms);
// Connection of the svc_handler with the remote host.
// This method also encapsulates the connection done with
// auto_purging under the hood. If the connect failed due to the
// process running out of file descriptors then, auto_purging of
// some connections are done from the CONNECTION_CACHE. This frees
// the descriptors which get used in the connect process and hence
// the connect operation can succeed.
virtual int purge_connections (double percentage = 10);
// Explicit purging of connection entries from the connection cache.
// = Typedefs for managing the map
typedef ACE_Refcounted_Hash_Recyclable<ACE_PEER_CONNECTOR_ADDR>
REFCOUNTED_HASH_RECYCLABLE_ADDRESS;
typedef ACE_Hash_Cache_Map_Manager<REFCOUNTED_HASH_RECYCLABLE_ADDRESS, SVC_HANDLER *, ACE_Hash<REFCOUNTED_HASH_RECYCLABLE_ADDRESS>,ACE_Equal_To<REFCOUNTED_HASH_RECYCLABLE_ADDRESS>, CACHING_STRATEGY, ATTRIBUTES>
CONNECTION_CACHE;
typedef ACE_TYPENAME CONNECTION_CACHE::CACHE_ENTRY
CONNECTION_CACHE_ENTRY;
typedef ACE_TYPENAME CONNECTION_CACHE::key_type
KEY;
typedef ACE_TYPENAME CONNECTION_CACHE::mapped_type
VALUE;
typedef ACE_TYPENAME CONNECTION_CACHE::ITERATOR
CONNECTION_CACHE_ITERATOR;
// = Cleanup of the svc_handler.
typedef ACE_Svc_Cleanup_Strategy<REFCOUNTED_HASH_RECYCLABLE_ADDRESS, ACE_Pair<SVC_HANDLER *, ATTRIBUTES>,ACE_Hash_Map_Manager_Ex<REFCOUNTED_HASH_RECYCLABLE_ADDRESS, ACE_Pair<SVC_HANDLER *, ATTRIBUTES>, ACE_Hash<REFCOUNTED_HASH_RECYCLABLE_ADDRESS>, ACE_Equal_To<REFCOUNTED_HASH_RECYCLABLE_ADDRESS>, MUTEX> >
SVC_CLEANUP_STRATEGY;
typedef ACE_Cached_Connect_Strategy<SVC_HANDLER, ACE_PEER_CONNECTOR_2, MUTEX>
CCSBASE;
// = Accessor.
CACHING_STRATEGY &caching_strategy (void);
protected:
virtual int purge_i (const void *recycling_act);
// Remove from cache (non-locking version).
virtual int cache_i (const void *recycling_act);
// Add to cache (non-locking version).
virtual int mark_as_closed_i (const void *recycling_act);
// Mark as closed (non-locking version).
virtual int cleanup_hint_i (const void *recycling_act);
// Cleanup hint.
// = Helpers
virtual int check_hint_i (SVC_HANDLER *&sh,
const ACE_PEER_CONNECTOR_ADDR &remote_addr,
ACE_Time_Value *timeout,
const ACE_PEER_CONNECTOR_ADDR &local_addr,
int reuse_addr,
int flags,
int perms,
ACE_Hash_Map_Entry<ACE_Refcounted_Hash_Recyclable<ACE_PEER_CONNECTOR_ADDR>, ACE_Pair<SVC_HANDLER *, ATTRIBUTES> > *&entry,
int &found);
virtual int find_or_create_svc_handler_i (SVC_HANDLER *&sh,
const ACE_PEER_CONNECTOR_ADDR &remote_addr,
ACE_Time_Value *timeout,
const ACE_PEER_CONNECTOR_ADDR &local_addr,
int reuse_addr,
int flags,
int perms,
ACE_Hash_Map_Entry<ACE_Refcounted_Hash_Recyclable<ACE_PEER_CONNECTOR_ADDR>, ACE_Pair<SVC_HANDLER *, ATTRIBUTES> > *&entry,
int &found);
virtual int connect_svc_handler_i (SVC_HANDLER *&sh,
const ACE_PEER_CONNECTOR_ADDR &remote_addr,
ACE_Time_Value *timeout,
const ACE_PEER_CONNECTOR_ADDR &local_addr,
int reuse_addr,
int flags,
int perms,
int &found);
CONNECTION_CACHE connection_cache_;
// Table that maintains the cache of connected <SVC_HANDLER>s.
SVC_CLEANUP_STRATEGY *svc_cleanup_strategy_;
// The strategy which controls the destruction and closing of the
// svc_handler.
CACHING_STRATEGY *caching_strategy_;
// The strategy which decides how and when entries are to be removed
// from the connection_cache.
};
#if !defined (ACE_LACKS_INLINE_FUNCTIONS)
#include "ace/Cached_Connect_Strategy_T.i"
#endif /* ACE_LACKS_INLINE_FUNCTIONS */
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Cached_Connect_Strategy_T.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Cached_Connect_Strategy_T.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#endif /* CACHED_CONNECT_STRATEGY_T_H */
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