blob: f15be75eb2c2542134cb9af08cf0d7bf37b65e9b (
plain) (
blame)
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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
//Licensed under Apache License version 2.0
package javax.jmdns.impl.tasks.state;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.jmdns.ServiceInfo;
import javax.jmdns.impl.DNSOutgoing;
import javax.jmdns.impl.DNSStatefulObject;
import javax.jmdns.impl.JmDNSImpl;
import javax.jmdns.impl.ServiceInfoImpl;
import javax.jmdns.impl.constants.DNSConstants;
import javax.jmdns.impl.constants.DNSState;
import javax.jmdns.impl.tasks.DNSTask;
/**
* This is the root class for all state tasks. These tasks work with objects that implements the {@link javax.jmdns.impl.DNSStatefulObject} interface and therefore participate in the state machine.
*
* @version %I%, %G%
* @author Pierre Frisch
*/
public abstract class DNSStateTask extends DNSTask
{
static Logger logger1 = Logger.getLogger(DNSStateTask.class.getName());
/**
* By setting a 0 ttl we effectively expire the record.
*/
private final int _ttl;
private static int _defaultTTL = DNSConstants.DNS_TTL;
/**
* The state of the task.
*/
private DNSState _taskState = null;
public abstract String getTaskDescription();
public static int defaultTTL()
{
return _defaultTTL;
}
/**
* For testing only do not use in production.
*
* @param value
*/
public static void setDefaultTTL(int value)
{
_defaultTTL = value;
}
/**
* @param jmDNSImpl
* @param ttl
*/
public DNSStateTask(JmDNSImpl jmDNSImpl, int ttl)
{
super(jmDNSImpl);
_ttl = ttl;
}
/**
* @return the ttl
*/
public int getTTL()
{
return _ttl;
}
/**
* Associate the DNS host and the service infos with this task if not already associated and in the same state.
*
* @param state
* target state
*/
protected void associate(DNSState state)
{
synchronized (this.getDns())
{
this.getDns().associateWithTask(this, state);
}
for (ServiceInfo serviceInfo : this.getDns().getServices().values())
{
((ServiceInfoImpl) serviceInfo).associateWithTask(this, state);
}
}
/**
* Remove the DNS host and service info association with this task.
*/
protected void removeAssociation()
{
// Remove association from host to this
synchronized (this.getDns())
{
this.getDns().removeAssociationWithTask(this);
}
// Remove associations from services to this
for (ServiceInfo serviceInfo : this.getDns().getServices().values())
{
((ServiceInfoImpl) serviceInfo).removeAssociationWithTask(this);
}
}
@Override
public void run()
{
DNSOutgoing out = new DNSOutgoing(DNSConstants.FLAGS_QR_QUERY);
try
{
if (!this.checkRunCondition())
{
this.cancel();
return;
}
List<DNSStatefulObject> stateObjects = new ArrayList<DNSStatefulObject>();
// send probes for JmDNS itself
synchronized (this.getDns())
{
if (this.getDns().isAssociatedWithTask(this, this.getTaskState()))
{
logger1.finer(this.getName() + ".run() JmDNS " + this.getTaskDescription() + " " + this.getDns().getName());
stateObjects.add(this.getDns());
out = this.buildOutgoingForDNS(out);
}
}
// send probes for services
for (ServiceInfo serviceInfo : this.getDns().getServices().values())
{
ServiceInfoImpl info = (ServiceInfoImpl) serviceInfo;
synchronized (info)
{
if (info.isAssociatedWithTask(this, this.getTaskState()))
{
logger1.fine(this.getName() + ".run() JmDNS " + this.getTaskDescription() + " " + info.getQualifiedName());
stateObjects.add(info);
out = this.buildOutgoingForInfo(info, out);
}
}
}
if (!out.isEmpty())
{
logger1.finer(this.getName() + ".run() JmDNS " + this.getTaskDescription() + " #" + this.getTaskState());
this.getDns().send(out);
// Advance the state of objects.
this.advanceObjectsState(stateObjects);
}
else
{
// Advance the state of objects.
this.advanceObjectsState(stateObjects);
// If we have nothing to send, another timer taskState ahead of us has done the job for us. We can cancel.
cancel();
return;
}
}
catch (Throwable e)
{
logger1.log(Level.WARNING, this.getName() + ".run() exception ", e);
this.recoverTask(e);
}
this.advanceTask();
}
protected abstract boolean checkRunCondition();
protected abstract DNSOutgoing buildOutgoingForDNS(DNSOutgoing out) throws IOException;
protected abstract DNSOutgoing buildOutgoingForInfo(ServiceInfoImpl info, DNSOutgoing out) throws IOException;
protected void advanceObjectsState(List<DNSStatefulObject> list)
{
if (list != null)
{
for (DNSStatefulObject object : list)
{
synchronized (object)
{
object.advanceState(this);
}
}
}
}
protected abstract void recoverTask(Throwable e);
protected abstract void advanceTask();
/**
* @return the taskState
*/
protected DNSState getTaskState()
{
return this._taskState;
}
/**
* @param taskState
* the taskState to set
*/
protected void setTaskState(DNSState taskState)
{
this._taskState = taskState;
}
}
|
