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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ACE
//
// = FILENAME
// Token_Collection.h
//
// = DESCRIPTION
// The ACE_Token class offers methods for acquiring, renewing,
// and releasing a synchronization token on a per-token basis. The
// ACE_Token_Collection offers an interface for performing
// operations on groups of tokens as a whole, or on a single token
// within the collection.
//
// The atomic group operations are not yet implemented.
//
// = AUTHOR
// Douglas C. Schmidt (schmidt@cs.wustl.edu) and
// Tim Harrison (harrison@cs.wustl.edu)
//
// ============================================================================
#if !defined (ACE_TOKEN_COLLECTION_H)
#define ACE_TOKEN_COLLECTION_H
#include "ace/Map_Manager.h"
#include "ace/Local_Tokens.h"
#include "ace/SString.h"
class ACE_Export ACE_Token_Collection : public ACE_Token_Proxy
// = TITLE
// Allows atomic token group operations AND
// provides a ACE_Token manager interface.
//
// = DESCRIPTION
// There are two types of operations offered by
// ACE_Token_Collection. The first is atomic operations on
// collections of Token_Proxies. In this respect, the
// ACE_Token_Collection can be thought of as a single token
// consisting of multiple Token_Proxies. The second role of the
// ACE_Token_Collection is as a ACE_Token manager.
// ACE_Token_Collection allows individual operations on single
// members of a collection of Token_Proxies. This provides a
// single access point for operations on multiple tokens.
// = Bugs
// Although ACE_Token_Collection inherits from ACE_Token_Proxy, it
// can not be including in a collection. This is because clone()
// returns zero for now.
{
public:
ACE_Token_Collection (int debug = 0,
const char *name = 0);
// <debug> print out verbose debugging messages. <name> will give a
// name to the collection. Collections don't really need names, but
// are sometimes useful for debugging.
// Collection Management operations
int insert (ACE_Token_Proxy &token);
// Insert a Token into the collection. All ACE_Token type
// operations performed on the collection will also be performed on
// the new_proxy until it is removed. Note that no operations
// performed prior to the insertion will be performed. Returns: 0
// on success, -1 on failure with <errno> == problem. If a token
// proxy already exists in the collection with the same name, the
// insertion will fail. Also, <token> is copied. Note that during
// the copy, client_id's are *not* inherited. The client ID of the
// thread using the collection will be used. Client ID's can be
// changed explicity on each proxy using is_member.
int extract (const char *token_name, ACE_Token_Proxy *&proxy);
// removes the ACE_Token matching the given token_name from the
// collection. On success, extract returns 0. On failure
// (token_name was not in the collection,) extract returns -1. On
// success, the state of the token found is copied into proxy.
// The returned ACE_Token_Proxy* must be deleted by the user.
ACE_Token_Proxy *is_member (const char *token_name);
// returns the proxy if true. 0 otherwise.
int is_member (const ACE_Token_Proxy &token);
// Is the specified token in the collection?
// 1, yes.
// 0, no.
// = Collective operation semantics.
// For acquire, renew, and release, there are two interfaces. Once
// interface allows an operation on a single token in the
// collection. The collective interfaces perform atomic operations
// on the entire collection. For instance, a collective acquire
// will perform an acquire for each and every token in the
// collection or the operation will fail. Currently, these
// operations are performed with no ordering heuristics. That is,
// the Collection steps through the tokens in the order they were
// inserted. For each one it performs the operation (acquire,
// renew, or release).
virtual int acquire (int notify = 0,
void (*sleep_hook)(void *) = 0,
ACE_Synch_Options &options =
ACE_Synch_Options::defaults);
// Acquire "atomically" all resources in the collection. This is
// only successfull if all tokens in the collection could be
// acquired. options contains the blocking semantics, timeout
// value, etc. Returns: 0 on success, -1 on failure with <errno> ==
// problem. If and error or deadlock occurs for one of the tokens,
// all the tokens will be released and the method will return -1.
// Note that returning on detection of deadlock prevents livelock
// between competing collections. If a collection returns after
// detecting deadlock, it is the application's responsibility to not
// to blindly loop on the collection::acquire operation. In other
// words, once the collection reports deadlock, it is out of our
// hands.
virtual int acquire (const char *token_name,
int notify = 0,
void (*sleep_hook)(void *) = 0,
ACE_Synch_Options &options =
ACE_Synch_Options::defaults);
// Acquire the token corresponding to <token_name>. The other
// parameters are passed to <token>::acquire.
virtual int tryacquire (void (*sleep_hook)(void *) = 0);
// Try to acquire all tokens in collection.
virtual int tryacquire (const char *token_name,
void (*sleep_hook)(void *) = 0);
// Try to acquire <token_name>.
virtual int renew (int requeue_position = 0,
ACE_Synch_Options &options =
ACE_Synch_Options::defaults);
// Renews "atomically" all resources in the collection. This is
// only successfull if all tokens in the collection could be
// renewed. options contains the blocking semantics, timeout
// value, etc. Returns: 0 on success, -1 on failure with <errno> ==
// problem.
virtual int renew (const char *token_name,
int requeue_position = 0,
ACE_Synch_Options &options =
ACE_Synch_Options::defaults);
// Renew the token corresponding to <token_name>. The other
// parameters are passed to <token>::renew.
virtual int release (ACE_Synch_Options &options =
ACE_Synch_Options::defaults);
// Releases "atomically" all resources in the collection. This is
// only successfull if all tokens in the collection could be
// released. options contains the blocking semantics, timeout
// value, etc. Returns: 0 on success, -1 on failure with <errno> ==
// problem.
virtual int release (const char *token_name,
ACE_Synch_Options &options =
ACE_Synch_Options::defaults);
// Release the token corresponding to <token_name>. The other
// parameters are passed to <token>::release.
~ACE_Token_Collection (void);
void dump (void) const;
// Dump the state of the class.
virtual const char *name (void) const;
// Return the name of the collection. Not very functionally
// important, but sometimes a useful debugging tool.
protected:
typedef ACE_Token_Name TOKEN_NAME;
typedef ACE_Map_Manager<TOKEN_NAME, ACE_Token_Proxy *, ACE_Null_Mutex>
COLLECTION;
// COLLECTION maintains a mapping from token names to ACE_Tokens*
typedef ACE_Map_Iterator<TOKEN_NAME, ACE_Token_Proxy *, ACE_Null_Mutex>
COLLECTION_ITERATOR;
// Allows iterations through collection_
typedef ACE_Map_Entry<TOKEN_NAME, ACE_Token_Proxy *>
COLLECTION_ENTRY;
// Allows iterations through collection_
COLLECTION collection_;
// COLLECTION maintains a mapping from token names to ACE_Tokens*.
int debug_;
// Whether to print out debug messages or not.
char name_[ACE_MAXTOKENNAMELEN];
// Name of the collection.
// = I'm not sure what these mean, but they have to be defined since they're
// pure virtual in ACE_Token_Proxy.
virtual ACE_Token_Proxy *clone (void) const;
virtual ACE_Tokens *create_token (const char *name);
};
#if defined (__ACE_INLINE__)
#include "ace/Token_Collection.i"
#endif /* __ACE_INLINE__ */
#endif /* ACE_TOKEN_COLLECTION_H */
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