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// -*- C++ -*-
//=============================================================================
/**
* @file Cached_Connect_Strategy_T.h
*
* $Id$
*
* @author Kirthika Parameswaran <kirthika@cs.wustl.edu>
*/
//=============================================================================
#ifndef CACHED_CONNECT_STRATEGY_T_H
#define CACHED_CONNECT_STRATEGY_T_H
#include /**/ "ace/pre.h"
#include "ace/config-all.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# 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"
// For linkers which cant grok long names...
#define ACE_Cached_Connect_Strategy_Ex ACCSE
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
/**
* @class ACE_Cached_Connect_Strategy_Ex
*
* @brief A connection strategy which caches connections to peers
* (represented by <SVC_HANDLER> instances), thereby allowing
* subsequent re-use of unused, but available, connections.
*
* <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.
*/
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>
{
public:
/// Constructor
ACE_Cached_Connect_Strategy_Ex (
CACHING_STRATEGY &caching_s,
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);
/// Destructor
virtual ~ACE_Cached_Connect_Strategy_Ex (void);
/// Explicit purging of connection entries from the connection cache.
virtual int purge_connections (void);
/// Mark as closed (non-locking version). This is used during the cleanup of the
/// connections purged.
virtual int mark_as_closed_i (const void *recycling_act);
/**
* Since g++ version < 2.8 arent happy with templates, this special
* method had to be devised to avoid memory leaks and perform
* cleanup of the <connection_cache_>.
*/
void cleanup (void);
// = 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_Recyclable_Handler_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> >
CLEANUP_STRATEGY;
typedef ACE_Cached_Connect_Strategy<SVC_HANDLER, ACE_PEER_CONNECTOR_2, MUTEX>
CCSBASE;
// = Accessor.
CACHING_STRATEGY &caching_strategy (void);
protected:
/// Find an idle handle.
int find (ACE_Refcounted_Hash_Recyclable<ACE_PEER_CONNECTOR_ADDR> &search_addr,
ACE_Hash_Map_Entry<ACE_Refcounted_Hash_Recyclable<ACE_PEER_CONNECTOR_ADDR>, ACE_Pair<SVC_HANDLER *, ATTRIBUTES> > *&entry);
/// Remove from cache (non-locking version).
virtual int purge_i (const void *recycling_act);
/// Add to cache (non-locking version).
virtual int cache_i (const void *recycling_act);
/// Get/Set <recycle_state> (non-locking version).
virtual int recycle_state_i (const void *recycling_act,
ACE_Recyclable_State new_state);
virtual ACE_Recyclable_State recycle_state_i (const void *recycling_act) const;
/// Cleanup hint and reset <*act_holder> to zero if <act_holder != 0>.
virtual int cleanup_hint_i (const void *recycling_act,
void **act_holder);
// = Helpers
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 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 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);
/// Table that maintains the cache of connected <SVC_HANDLER>s.
CONNECTION_CACHE connection_cache_;
};
/////////////////////////////////////////////////////////////////////////////
// For linkers which cant grok long names...
#define ACE_Bounded_Cached_Connect_Strategy ABCCS
/**
* @class ACE_Bounded_Cached_Connect_Strategy
*
* @brief A connection strategy which caches connections to peers
* (represented by <SVC_HANDLER> instances), thereby allowing
* subsequent re-use of unused, but available, connections.
* This strategy should be used when the cache is bounded by
* maximum size.
*
* <Bounded_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.
* Thanks to Edan Ayal <edana@bandwiz.com> for contributing this
* class and Susan Liebeskind <shl@janis.gtri.gatech.edu> for
* brainstorming about it.
*/
template <class SVC_HANDLER, ACE_PEER_CONNECTOR_1,
class CACHING_STRATEGY, class ATTRIBUTES,
class MUTEX>
class ACE_Bounded_Cached_Connect_Strategy
: public ACE_Cached_Connect_Strategy_Ex<SVC_HANDLER, ACE_PEER_CONNECTOR_2, CACHING_STRATEGY, ATTRIBUTES, MUTEX>
{
typedef ACE_Cached_Connect_Strategy_Ex<SVC_HANDLER, ACE_PEER_CONNECTOR_2, CACHING_STRATEGY, ATTRIBUTES, MUTEX>
CCSEBASE;
// = Typedefs for managing the map
typedef ACE_Refcounted_Hash_Recyclable<ACE_PEER_CONNECTOR_ADDR>
REFCOUNTED_HASH_RECYCLABLE_ADDRESS;
public:
/// Constructor
ACE_Bounded_Cached_Connect_Strategy (size_t max_size,
CACHING_STRATEGY &caching_s,
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);
/// Destructor
virtual ~ACE_Bounded_Cached_Connect_Strategy (void);
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
protected:
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);
protected:
/// max items in the cache, used as a bound for the creation of svc_handlers.
size_t max_size_;
};
ACE_END_VERSIONED_NAMESPACE_DECL
#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 */
#include /**/ "ace/post.h"
#endif /* CACHED_CONNECT_STRATEGY_T_H */
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