blob: f02daeb1f771f65b9a57d2879688fd0450e6d3eb (
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
|
// -*- C++ -*-
// $Id$
#include "Minimum_Dispersion.h"
#include "ReplicaProxy.h"
ACE_RCSID(orbsvcs, Minimum_Dispersion, "$Id$")
Minimum_Dispersion_Strategy::Minimum_Dispersion_Strategy (void)
: proxies_ ()
{
}
Minimum_Dispersion_Strategy::~Minimum_Dispersion_Strategy (void)
{
ReplicaProxySetIterator begin = this->proxies_.begin ();
ReplicaProxySetIterator end = this->proxies_.end ();
for (ReplicaProxySetIterator i = begin;
i != end;
++i)
{
// Decrease reference count on each proxy servant in the set.
(*i)->_remove_ref ();
}
}
CORBA::Object_ptr
Minimum_Dispersion_Strategy::replica (CORBA::Environment &ACE_TRY_ENV)
{
while (!this->proxies_.is_empty ())
{
ReplicaProxySetIterator begin = this->proxies_.begin ();
ReplicaProxySetIterator end = this->proxies_.end ();
ReplicaProxySetIterator i = begin;
ReplicaProxy_Impl * proxy = (*i);
float d = (*i)->current_load ();
for (++i ; i != end; ++i)
{
if (d > (*i)->current_load ())
{
proxy = *i;
d = (*i)->current_load ();
}
}
// @@ Setup a timeout
ACE_TRY
{
CORBA::Object_var object =
proxy->replica ();
CORBA::Boolean non_existent =
object->_non_existent (ACE_TRY_ENV);
ACE_TRY_CHECK;
if (!non_existent)
{
return object._retn ();
}
}
ACE_CATCHANY
{
}
ACE_ENDTRY;
// @@ A bit melodramatic...
this->proxies_.remove (proxy);
}
// @@ What do we do if the set is empty?
ACE_THROW_RETURN (CORBA::OBJECT_NOT_EXIST (),
CORBA::Object::_nil ());
}
int
Minimum_Dispersion_Strategy::insert (ReplicaProxy_Impl *proxy)
{
return this->proxies_.insert (proxy);
}
int
Minimum_Dispersion_Strategy::remove (ReplicaProxy_Impl *proxy)
{
return this->proxies_.remove (proxy);
}
void
Minimum_Dispersion_Strategy::load_changed (ReplicaProxy_Impl *proxy,
CORBA::Environment &ACE_TRY_ENV)
{
if (this->proxies_.is_empty ())
return;
ReplicaProxySetIterator begin = this->proxies_.begin ();
ReplicaProxySetIterator end = this->proxies_.end ();
float s = 0;
CORBA::ULong n = 0;
ReplicaProxySetIterator i = begin;
for (;i != end; ++i)
{
s += (*i)->current_load ();
n++;
}
float avg = s / n;
float cl = proxy->current_load ();
if (avg == 0)
return;
float relative_load = cl / avg;
ACE_DEBUG ((LM_DEBUG, "Load[%x] %f %f %f\n",
proxy, cl, avg, relative_load));
if (relative_load > 1 + 1.5F / n)
{
proxy->has_high_load_ = 1;
proxy->control_->high_load_advisory (ACE_TRY_ENV);
ACE_CHECK;
return;
}
if (proxy->has_high_load_ && relative_load < 1 + 0.9F / n)
{
proxy->has_high_load_ = 0;
proxy->control_->nominal_load_advisory (ACE_TRY_ENV);
ACE_CHECK;
}
}
|
