Reference

ACE_Cached_Connect_Strategy(3)

A connection strategy which caches connections to peers (represented by SVC_HANDLER instances), thereby allowing subsequent re-use of unused, but available, connections.

NAME

ACE_Cached_Connect_Strategy - A connection strategy which caches connections to peers (represented by SVC_HANDLER instances), thereby allowing subsequent re-use of unused, but available, connections.

SYNOPSIS

#include <ace/ACE_Strategies_T.h>
template<class SVC_HANDLER, ACE_PEER_CONNECTOR_1, class MUTEX>
class ACE_Cached_Connect_Strategy : 
  public ACE_Connection_Recycling_Strategy,
  public ACE_Connect_Strategy<SVC_HANDLER, ACE_PEER_CONNECTOR_2>
{
  public:
        typedef ACE_Cached_Connect_Strategy<SVC_HANDLER, ACE_PEER_CONNECTOR_2, MUTEX> SELF;
        
    ACE_Cached_Connect_Strategy (
        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 *mutex = 0,
        int delete_mutex = 0
        );
    virtual ~ACE_Cached_Connect_Strategy (void);
    virtual int open (
        ACE_Creation_Strategy<SVC_HANDLER> *cre_s,
        ACE_Concurrency_Strategy<SVC_HANDLER> *con_s,
        ACE_Recycling_Strategy<SVC_HANDLER> *rec_s
        );
    virtual int make_svc_handler (SVC_HANDLER *&sh);
    virtual int activate_svc_handler (SVC_HANDLER *svc_handler);
    virtual int assign_recycler (
        SVC_HANDLER *svc_handler,
        ACE_Connection_Recycling_Strategy *recycler,
        const void *recycling_act
        );
    virtual int prepare_for_recycling (SVC_HANDLER *svc_handler);
    virtual int connect_svc_handler (
        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
        );
    virtual int connect_svc_handler (
        SVC_HANDLER *&sh,
        SVC_HANDLER *&sh_copy,
        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
        );
    virtual int purge (const void *recycling_act);
    virtual int cache (const void *recycling_act);
    virtual int recycle_state (
        const void *recycling_act,
        ACE_Recyclable_State new_state
        );
    virtual ACE_Recyclable_State recycle_state (
        const void *recycling_act
        ) const;
    virtual int mark_as_closed (const void *recycling_act);
    virtual int mark_as_closed_i (const void *recycling_act);
    virtual int cleanup_hint (const void *recycling_act);
    typedef ACE_Creation_Strategy<SVC_HANDLER> CREATION_STRATEGY;
        typedef ACE_Concurrency_Strategy<SVC_HANDLER> CONCURRENCY_STRATEGY;
        
    typedef ACE_Recycling_Strategy<SVC_HANDLER> RECYCLING_STRATEGY;
        typedef ACE_Connect_Strategy<SVC_HANDLER, ACE_PEER_CONNECTOR_2> CONNECT_STRATEGY;
        
        typedef ACE_Refcounted_Hash_Recyclable<ACE_PEER_CONNECTOR_ADDR> REFCOUNTED_HASH_RECYCLABLE_ADDRESS;
        
        typedef ACE_Hash_Map_Manager<REFCOUNTED_HASH_RECYCLABLE_ADDRESS, SVC_HANDLER *, ACE_Null_Mutex> CONNECTION_MAP;
        
        typedef ACE_Hash_Map_Iterator<REFCOUNTED_HASH_RECYCLABLE_ADDRESS, SVC_HANDLER *, ACE_Null_Mutex> CONNECTION_MAP_ITERATOR;
        
        typedef ACE_Hash_Map_Entry<REFCOUNTED_HASH_RECYCLABLE_ADDRESS, SVC_HANDLER *> CONNECTION_MAP_ENTRY;
        
    typedef ACE_Reverse_Lock<MUTEX> REVERSE_MUTEX;
    virtual ACE_Creation_Strategy<SVC_HANDLER> *creation_strategy (
        void
        ) const;
    virtual ACE_Recycling_Strategy<SVC_HANDLER> *recycling_strategy (
        void
        ) const;
    virtual ACE_Concurrency_Strategy<SVC_HANDLER> *concurrency_strategy (
        void
        ) const;
  protected:
    virtual int new_connection (
        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 find (
        ACE_Refcounted_Hash_Recyclable<ACE_PEER_CONNECTOR_ADDR> &search_addr,
        ACE_Hash_Map_Entry<ACE_Refcounted_Hash_Recyclable<ACE_PEER_CONNECTOR_ADDR>, SVC_HANDLER *> *&entry
        );
    virtual int purge_i (const void *recycling_act);
    virtual int cache_i (const void *recycling_act);
    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;
    virtual int cleanup_hint_i (const void *recycling_act);
    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>, SVC_HANDLER *> *&entry,
        int &found
        );
    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>, SVC_HANDLER *> *&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_MAP connection_map_;
    MUTEX *lock_;
    int delete_lock_;
    REVERSE_MUTEX *reverse_lock_;
    CREATION_STRATEGY *creation_strategy_;
    int delete_creation_strategy_;
    CONCURRENCY_STRATEGY *concurrency_strategy_;
    int delete_concurrency_strategy_;
    RECYCLING_STRATEGY *recycling_strategy_;
    int delete_recycling_strategy_;
};

DESCRIPTION

ACE_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.

Define some useful typedefs.

typedef ACE_Creation_Strategy<SVC_HANDLER> CREATION_STRATEGY;


typedef ACE_Concurrency_Strategy<SVC_HANDLER> CONCURRENCY_STRATEGY;


typedef ACE_Recycling_Strategy<SVC_HANDLER> RECYCLING_STRATEGY;

Super class

    typedef ACE_Connect_Strategy<SVC_HANDLER, ACE_PEER_CONNECTOR_2> CONNECT_STRATEGY;

Typedefs for managing the map

    typedef ACE_Refcounted_Hash_Recyclable<ACE_PEER_CONNECTOR_ADDR> REFCOUNTED_HASH_RECYCLABLE_ADDRESS;
    


    typedef ACE_Hash_Map_Manager<REFCOUNTED_HASH_RECYCLABLE_ADDRESS, SVC_HANDLER *, ACE_Null_Mutex> CONNECTION_MAP;
    


    typedef ACE_Hash_Map_Iterator<REFCOUNTED_HASH_RECYCLABLE_ADDRESS, SVC_HANDLER *, ACE_Null_Mutex> CONNECTION_MAP_ITERATOR;
    


    typedef ACE_Hash_Map_Entry<REFCOUNTED_HASH_RECYCLABLE_ADDRESS, SVC_HANDLER *> CONNECTION_MAP_ENTRY;
    


typedef ACE_Reverse_Lock<MUTEX> REVERSE_MUTEX;

Strategy accessors

virtual ACE_Creation_Strategy<SVC_HANDLER> *creation_strategy (
    void
    ) const;


virtual ACE_Recycling_Strategy<SVC_HANDLER> *recycling_strategy (
    void
    ) const;


virtual ACE_Concurrency_Strategy<SVC_HANDLER> *concurrency_strategy (
    void
    ) const;

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>, SVC_HANDLER *> *&entry,
    int &found
    );


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>, SVC_HANDLER *> *&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_MAP connection_map_;

Table that maintains the cache of connected SVC_HANDLERs.

MUTEX *lock_;

Mutual exclusion for this object.

int delete_lock_;

Mutual exclusion for this object.

REVERSE_MUTEX *reverse_lock_;

Reverse lock.

Strategy objects.

CREATION_STRATEGY *creation_strategy_;

Creation strategy for an Connector.

int delete_creation_strategy_;

1 if Connector created the creation strategy and thus should delete it, else 0.

CONCURRENCY_STRATEGY *concurrency_strategy_;

Concurrency strategy for an Connector.

int delete_concurrency_strategy_;

1 if Connector created the concurrency strategy and thus should delete it, else 0.

RECYCLING_STRATEGY *recycling_strategy_;

Recycling strategy for an Connector.

int delete_recycling_strategy_;

1 if Connector created the recycling strategy and thus should delete it, else 0.

AUTHOR

Doug Schmidt

LIBRARY

ace