blob: bea994c294ad28a0dfaacf161a4629948c35034b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
// -*- C++ -*-
//=============================================================================
/**
* @file ObjectKey_Table.h
*
* $Id$
*
* @author Balachandran Natarajan <bala@dre.vanderbilt.edu>
*/
//=============================================================================
#ifndef TAO_OBJECTKEY_TABLE_H
#define TAO_OBJECTKEY_TABLE_H
#include /**/ "ace/pre.h"
#include "ace/RB_Tree.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Null_Mutex.h"
#include "tao/Object_KeyC.h"
#include /**/ "tao/Versioned_Namespace.h"
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
// Forward declarations
class TAO_ORB_Core;
namespace TAO
{
// Forward declarations within the namespace..
class Refcounted_ObjectKey;
class ObjectKey;
/**
* @class Less_Than_ObjectKey
*
* @brief Compares the length and then the contents of ObjectKeys.
*
* Should have been a specialization of the functor
* ACE_Less_Than<sequence<CORBA::Octet>>. But that will not work
* so easily across bunch of stuff. Hence let us put up with this
* for the time being.
*/
class TAO_Export Less_Than_ObjectKey
{
public:
bool operator () (const TAO::ObjectKey &lhs,
const TAO::ObjectKey &rhs) const;
};
/**
* @class ObjectKey_Table
*
* @brief Table that maintains the set of ObjectKey's seen by the
* ORB.
*
* The ORB maintains one table for the whole ORB. ObjectKeys
* generated by the ORB or the ones seen by the ORB from remote
* ORB's are stored here. The ObjectKeys are stored through a
* wrapper which encapsulates the refcount on them. This class
* actually provides the synchronization mechanism for manipulating
* the reference counts on the object keys provided by the wrapper
* class.
*
* This class does not offer a find () call with a reason. The call
* to bind () will return a pointer which is expected to be cached
* by the client/caller and use the pointer in every invocation.
*
* @note This class uses the ACE_RB_Tree to maintain the table of
* ObjectKeys. The RB_Tree has good insertion and lookup
* properties. Its Iteration properties are not that good, but we
* dont need to do much iteration unless we are closing down the
* table.
*
* @note The reasons to use RB_Tree are its good dynamic
* properties. We should try to strategize the class to use either a
* Hash_Map or a RB_Tree based on some runtime option. For that we
* need an adapter class in ACE, like an ACE_Lock_Adapter class. We
* will do that if our instrumentation shows the need for it.
*
*/
class TAO_Export ObjectKey_Table
{
public:
/// Default Constructor and destructor..
ObjectKey_Table (void);
~ObjectKey_Table (void);
/// Initialize method that sets up the underlying lock and other
/// related stuff.
int init (TAO_ORB_Core *orb);
/// Iterates and unbinds the contents of the table.
int destroy (void);
/// Bind the ObjectKey in the table.
/**
* Bind an ObjectKey in the table and return a pointer to the
* Refcounted_ObjectKey which the client can use. If the ObjectKey
* is already available in the table, this operation just
* increments the refcount on the ObjectKey. If the ObjectKey is
* new it is bounded to the table. Returns a 0 on success and a -1
* on failure.
*/
int bind (const ObjectKey &key, Refcounted_ObjectKey *&key_new);
/// Unbind an ObjectKey from the table.
int unbind (TAO::Refcounted_ObjectKey *&key);
protected:
/// Implementation for bind ().
int bind_i (const ObjectKey &key, Refcounted_ObjectKey *&key_new);
/// Implementation for unbind ().
int unbind_i (Refcounted_ObjectKey *&key);
private:
// Some useful typedefs.
typedef ACE_RB_Tree<TAO::ObjectKey,
TAO::Refcounted_ObjectKey *,
TAO::Less_Than_ObjectKey,
ACE_Null_Mutex> TABLE;
/// Lock for the table.
ACE_Lock *lock_;
/// Table that contains the data
TABLE table_;
};
}
TAO_END_VERSIONED_NAMESPACE_DECL
#include /**/ "ace/post.h"
#endif /*TAO_OBJECT_KEY_TABLE_H*/
|
