|
1
|
/**
|
|
2
|
* '$RCSfile$'
|
|
3
|
* Purpose: A class to asyncronously force the replication of each server
|
|
4
|
* that has an entry in the xml_replication table. When run,
|
|
5
|
* this thread communicates with each server in the list and
|
|
6
|
* solicites a read of an updated or newly inserted document
|
|
7
|
* with a certain docid.
|
|
8
|
* Copyright: 2000 Regents of the University of California and the
|
|
9
|
* National Center for Ecological Analysis and Synthesis
|
|
10
|
* Authors: Chad Berkley
|
|
11
|
*
|
|
12
|
* '$Author: tao $'
|
|
13
|
* '$Date: 2007-04-12 18:34:59 -0700 (Thu, 12 Apr 2007) $'
|
|
14
|
* '$Revision: 3230 $'
|
|
15
|
*
|
|
16
|
* This program is free software; you can redistribute it and/or modify
|
|
17
|
* it under the terms of the GNU General Public License as published by
|
|
18
|
* the Free Software Foundation; either version 2 of the License, or
|
|
19
|
* (at your option) any later version.
|
|
20
|
*
|
|
21
|
* This program is distributed in the hope that it will be useful,
|
|
22
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
23
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
24
|
* GNU General Public License for more details.
|
|
25
|
*
|
|
26
|
* You should have received a copy of the GNU General Public License
|
|
27
|
* along with this program; if not, write to the Free Software
|
|
28
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
29
|
*/
|
|
30
|
|
|
31
|
package edu.ucsb.nceas.metacat;
|
|
32
|
|
|
33
|
import java.util.*;
|
|
34
|
import java.io.*;
|
|
35
|
import java.sql.*;
|
|
36
|
import java.net.*;
|
|
37
|
import java.lang.*;
|
|
38
|
import java.text.*;
|
|
39
|
|
|
40
|
import org.apache.log4j.Logger;
|
|
41
|
|
|
42
|
/**
|
|
43
|
* A class to asyncronously force the replication of each server
|
|
44
|
* that has an entry in the xml_replication table. When run,
|
|
45
|
* this thread communicates with each server in the list and
|
|
46
|
* solicites a read of an updated or newly inserted document
|
|
47
|
* with a certain docid.
|
|
48
|
*/
|
|
49
|
public class ForceReplicationHandler implements Runnable
|
|
50
|
{
|
|
51
|
private Thread btThread;
|
|
52
|
private MetaCatUtil util = new MetaCatUtil();
|
|
53
|
private String docid;
|
|
54
|
private String action;
|
|
55
|
private boolean xmlDocument;
|
|
56
|
private boolean dbactionFlag = true;
|
|
57
|
private ReplicationServerList serverLists = null;//Serverlist
|
|
58
|
private int homeServerCode = 0; // home server code for the docid
|
|
59
|
// When a metacat A got forcereplication
|
|
60
|
// notification from B, then A will update its record. And A will notification
|
|
61
|
// other metacat in its serverlist to update this docid if A is a hub. But we
|
|
62
|
// don't want A to notify B again. B is nofitification of A
|
|
63
|
private String notificationServer = null;
|
|
64
|
private Logger logMetacat = Logger.getLogger(ForceReplicationHandler.class);
|
|
65
|
|
|
66
|
//constant
|
|
67
|
public static final String DELETE = "delete";
|
|
68
|
|
|
69
|
|
|
70
|
|
|
71
|
/**
|
|
72
|
* Constructor of ForceReplicationHandler
|
|
73
|
* @param docid the docid to force replicate
|
|
74
|
* @param the action that is being performed on the document (either
|
|
75
|
* INSERT or UPDATE)
|
|
76
|
* @param xml the docid is a xml document or not (data file)
|
|
77
|
* @param notificationServer, when a metacat A got forcereplication
|
|
78
|
* notification from B, then A will update its record. And A will notification
|
|
79
|
* other metacat in its serverlist to update this docid if A is a hub. But we
|
|
80
|
* don't want A to notify B again. B is nofitification of A.
|
|
81
|
*/
|
|
82
|
public ForceReplicationHandler(String docid, String action, boolean xml,
|
|
83
|
String myNotificationServer)
|
|
84
|
{
|
|
85
|
this.docid = docid;
|
|
86
|
this.action = action;
|
|
87
|
this.xmlDocument =xml;
|
|
88
|
// Build a severLists from xml_replication table
|
|
89
|
this.serverLists = new ReplicationServerList();
|
|
90
|
// Get sever code for this docid
|
|
91
|
try
|
|
92
|
{
|
|
93
|
this.homeServerCode = MetacatReplication.getHomeServerCodeForDocId(docid);
|
|
94
|
}//try
|
|
95
|
catch (Exception e)
|
|
96
|
{
|
|
97
|
logMetacat.error("Error in ForceReplicationHandle(): "
|
|
98
|
+e.getMessage());
|
|
99
|
}//catch
|
|
100
|
// Get the notification server
|
|
101
|
this.notificationServer = myNotificationServer;
|
|
102
|
|
|
103
|
if(this.action.equals(""))
|
|
104
|
{
|
|
105
|
dbactionFlag = false;
|
|
106
|
}
|
|
107
|
|
|
108
|
btThread = new Thread(this);
|
|
109
|
btThread.setPriority(Thread.MIN_PRIORITY);
|
|
110
|
btThread.start();
|
|
111
|
}
|
|
112
|
|
|
113
|
/**
|
|
114
|
* Use this constructor when the action is implied.
|
|
115
|
*/
|
|
116
|
public ForceReplicationHandler(String docid, boolean xml,
|
|
117
|
String myNotificationServer )
|
|
118
|
{
|
|
119
|
this.docid = docid;
|
|
120
|
this.xmlDocument = xml;
|
|
121
|
dbactionFlag = false;
|
|
122
|
// Build a severLists from xml_replication table
|
|
123
|
this.serverLists = new ReplicationServerList();
|
|
124
|
// Get home server code for this doicd
|
|
125
|
try
|
|
126
|
{
|
|
127
|
this.homeServerCode = MetacatReplication.getHomeServerCodeForDocId(docid);
|
|
128
|
}
|
|
129
|
catch (Exception e)
|
|
130
|
{
|
|
131
|
logMetacat.error("Error in ForceReplicationHandle(): "
|
|
132
|
+e.getMessage());
|
|
133
|
}//catch
|
|
134
|
// Get notification server
|
|
135
|
this.notificationServer = myNotificationServer;
|
|
136
|
btThread = new Thread(this);
|
|
137
|
btThread.setPriority(Thread.MIN_PRIORITY);
|
|
138
|
btThread.start();
|
|
139
|
}
|
|
140
|
|
|
141
|
/**
|
|
142
|
* Method to send force replication command to other server to get
|
|
143
|
* a new or updated docid
|
|
144
|
*/
|
|
145
|
public void run()
|
|
146
|
{
|
|
147
|
|
|
148
|
|
|
149
|
// URL for notifcation
|
|
150
|
URL comeAndGetIt = null;
|
|
151
|
// If no server in xml_replication table, metacat don't need do anything
|
|
152
|
if (serverLists.isEmpty())
|
|
153
|
{
|
|
154
|
return;
|
|
155
|
}
|
|
156
|
|
|
157
|
// Thread seelping for some seconds to make sure the document was insert
|
|
158
|
// into the database before we send force replication request
|
|
159
|
int sleepTime = Integer.parseInt
|
|
160
|
(MetaCatUtil.getOption("forcereplicationwaitingtime"));
|
|
161
|
try
|
|
162
|
{
|
|
163
|
Thread.sleep(sleepTime);
|
|
164
|
}
|
|
165
|
catch(Exception ee)
|
|
166
|
{
|
|
167
|
logMetacat.error("Couldn't sleep in force replication");
|
|
168
|
}
|
|
169
|
logMetacat.info("notification server:"+notificationServer);
|
|
170
|
// Check every server in the serverlists
|
|
171
|
for (int i=0; i<serverLists.size(); i++)
|
|
172
|
{
|
|
173
|
//Set comeAndGetIt null
|
|
174
|
comeAndGetIt = null;
|
|
175
|
// Get ReplicationServer object in index i
|
|
176
|
ReplicationServer replicationServer = serverLists.serverAt(i);
|
|
177
|
// Get this ReplicationServer 's name
|
|
178
|
String server = replicationServer.getServerName();
|
|
179
|
try
|
|
180
|
{
|
|
181
|
|
|
182
|
|
|
183
|
// If the server is the notification server, we don't notify it back
|
|
184
|
// again, if server is null we don't replication it
|
|
185
|
if (server!=null && !server.equals(notificationServer))
|
|
186
|
{
|
|
187
|
|
|
188
|
if(dbactionFlag)
|
|
189
|
{
|
|
190
|
// xml documents and server can replicate xml doucment
|
|
191
|
if (xmlDocument && replicationServer.getReplication())
|
|
192
|
{
|
|
193
|
// If this docid's homeserver is localhost, replicate it
|
|
194
|
if (homeServerCode==1)
|
|
195
|
{
|
|
196
|
MetacatReplication.replLog("force xml replicating to "
|
|
197
|
+ server);
|
|
198
|
comeAndGetIt = new URL("https://" + server +
|
|
199
|
"?action=forcereplicate&server=" +
|
|
200
|
util.getLocalReplicationServerName()+
|
|
201
|
"&docid=" + docid + "&dbaction=" +
|
|
202
|
action);
|
|
203
|
//over write the url for delete
|
|
204
|
if (action != null && action.equals(DELETE))
|
|
205
|
{
|
|
206
|
comeAndGetIt = new URL("https://" + server + "?action=" +
|
|
207
|
MetacatReplication.FORCEREPLICATEDELETE +
|
|
208
|
"&docid=" + docid +"&server="+ util.getLocalReplicationServerName());
|
|
209
|
|
|
210
|
}
|
|
211
|
}//if servercode==1
|
|
212
|
else if (replicationServer.getHub()||
|
|
213
|
server.equals(MetacatReplication.
|
|
214
|
getServerNameForServerCode(homeServerCode)))
|
|
215
|
{
|
|
216
|
// If the docid's home server is not local host, but local host
|
|
217
|
// is a hub of this server, replicate the docid too.
|
|
218
|
// If the server is homeserver of the docid, replication it too
|
|
219
|
MetacatReplication.replLog("force xml replicating to "
|
|
220
|
+ server);
|
|
221
|
comeAndGetIt = new URL("https://" + server +
|
|
222
|
"?action=forcereplicate&server=" +
|
|
223
|
util.getLocalReplicationServerName() +
|
|
224
|
"&docid=" + docid + "&dbaction=" +
|
|
225
|
action);
|
|
226
|
//over write the url for delete
|
|
227
|
if (action != null && action.equals(DELETE))
|
|
228
|
{
|
|
229
|
comeAndGetIt = new URL("https://" + server + "?action=" +
|
|
230
|
MetacatReplication.FORCEREPLICATEDELETE +
|
|
231
|
"&docid=" + docid+"&server="+ util.getLocalReplicationServerName());
|
|
232
|
|
|
233
|
}
|
|
234
|
}//else
|
|
235
|
|
|
236
|
}//if xmlDocument
|
|
237
|
//It is data file and configured to handle data replication
|
|
238
|
else if (replicationServer.getDataReplication())
|
|
239
|
{
|
|
240
|
// If the docid's home server is local host, replicate the docid
|
|
241
|
if (homeServerCode==1)
|
|
242
|
{
|
|
243
|
MetacatReplication.replLog("force data replicating to "
|
|
244
|
+ server);
|
|
245
|
comeAndGetIt = new URL("https://" + server +
|
|
246
|
"?action=forcereplicatedatafile&server=" +
|
|
247
|
util.getLocalReplicationServerName() +
|
|
248
|
"&docid=" + docid + "&dbaction=" +
|
|
249
|
action);
|
|
250
|
//over write the url for delete
|
|
251
|
if (action != null && action.equals(DELETE))
|
|
252
|
{
|
|
253
|
comeAndGetIt = new URL("https://" + server + "?action=" +
|
|
254
|
MetacatReplication.FORCEREPLICATEDELETE +
|
|
255
|
"&docid=" + docid +"&server="+ util.getLocalReplicationServerName());
|
|
256
|
|
|
257
|
}
|
|
258
|
|
|
259
|
}//if serverCode==1
|
|
260
|
else if (replicationServer.getHub()||
|
|
261
|
server.equals(MetacatReplication.
|
|
262
|
getServerNameForServerCode(homeServerCode)))
|
|
263
|
{
|
|
264
|
// If the docid's home server is not local host, but local host
|
|
265
|
// is a hub of this server, replicate the docid too.
|
|
266
|
// If the server is homeserver of the docid replication it too
|
|
267
|
MetacatReplication.replLog("force data replicating to "
|
|
268
|
+ server);
|
|
269
|
comeAndGetIt = new URL("https://" + server +
|
|
270
|
"?action=forcereplicatedatafile&server=" +
|
|
271
|
util.getLocalReplicationServerName() +
|
|
272
|
"&docid=" + docid + "&dbaction=" +
|
|
273
|
action);
|
|
274
|
//over write the url for delete
|
|
275
|
if (action != null && action.equals(DELETE))
|
|
276
|
{
|
|
277
|
comeAndGetIt = new URL("https://" + server + "?action=" +
|
|
278
|
MetacatReplication.FORCEREPLICATEDELETE +
|
|
279
|
"&docid=" + docid+"&server="+ util.getLocalReplicationServerName());
|
|
280
|
|
|
281
|
}
|
|
282
|
|
|
283
|
}//else if servercode==1
|
|
284
|
}//else if data file
|
|
285
|
|
|
286
|
}//if has explicite action
|
|
287
|
else
|
|
288
|
{ // has implicite action
|
|
289
|
MetacatReplication.replLog("force replicating (default action) to )"
|
|
290
|
+ server);
|
|
291
|
// this docid is xml documents and can replicate xml doucment
|
|
292
|
if (xmlDocument && replicationServer.getReplication())
|
|
293
|
{
|
|
294
|
// If homeserver of this doicd is local, replicate it
|
|
295
|
if (homeServerCode ==1)
|
|
296
|
{
|
|
297
|
comeAndGetIt = new URL("https://" + server +
|
|
298
|
"?action=forcereplicate&server=" +
|
|
299
|
util.getLocalReplicationServerName()+
|
|
300
|
"&docid=" + docid);
|
|
301
|
|
|
302
|
}//if homeserver ==1
|
|
303
|
else if (replicationServer.getHub()||
|
|
304
|
server.equals(MetacatReplication.
|
|
305
|
getServerNameForServerCode(homeServerCode)))
|
|
306
|
{
|
|
307
|
// If home server of this docid is not local host, but local
|
|
308
|
// host is a hub for this server, replicate this doicd
|
|
309
|
// If the server is homeserver of the docid, replication it too
|
|
310
|
comeAndGetIt = new URL("https://" + server +
|
|
311
|
"?action=forcereplicate&server=" +
|
|
312
|
util.getLocalReplicationServerName() +
|
|
313
|
"&docid=" + docid);
|
|
314
|
|
|
315
|
}//else if
|
|
316
|
|
|
317
|
}//if xmlDoucment
|
|
318
|
else if (replicationServer.getDataReplication())
|
|
319
|
{ //It is datafile and server is configured to replicate data file
|
|
320
|
|
|
321
|
//if home server is local host, replicate the data file
|
|
322
|
if (homeServerCode ==1)
|
|
323
|
{
|
|
324
|
comeAndGetIt = new URL("https://" + server +
|
|
325
|
"?action=forcereplicatedatafile&server=" +
|
|
326
|
util.getLocalReplicationServerName() +
|
|
327
|
"&docid=" + docid);
|
|
328
|
}//if
|
|
329
|
else if (replicationServer.getHub()||
|
|
330
|
server.equals(MetacatReplication.
|
|
331
|
getServerNameForServerCode(homeServerCode)))
|
|
332
|
{
|
|
333
|
// If home server is not local host, but the local host is a hub
|
|
334
|
// For this server, replicate the data file
|
|
335
|
// If the server is homeserver of the docid, replication it too
|
|
336
|
comeAndGetIt = new URL("https://" + server +
|
|
337
|
"?action=forcereplicatedatafile&server=" +
|
|
338
|
util.getLocalReplicationServerName() +
|
|
339
|
"&docid=" + docid);
|
|
340
|
|
|
341
|
}//else
|
|
342
|
}//else if
|
|
343
|
}//else has implicit action
|
|
344
|
|
|
345
|
//Make sure comeAndGetIt is not empty
|
|
346
|
if ( comeAndGetIt != null && !comeAndGetIt.equals(""))
|
|
347
|
{
|
|
348
|
logMetacat.warn("sending message: "
|
|
349
|
+ comeAndGetIt.toString());
|
|
350
|
String message = MetacatReplication.getURLContent(comeAndGetIt);
|
|
351
|
}
|
|
352
|
//send out the url. message is a dummy variable as the target of
|
|
353
|
//the URL never directly replies to the request. this simply
|
|
354
|
//invoces a read request from the server to this local machine.
|
|
355
|
}//if notification server
|
|
356
|
}
|
|
357
|
catch (Exception ee)
|
|
358
|
{
|
|
359
|
logMetacat.error("error in ForceReplicationHandler.run for server "
|
|
360
|
+ server +" "+ee.getMessage());
|
|
361
|
ee.printStackTrace();
|
|
362
|
}
|
|
363
|
}//for
|
|
364
|
|
|
365
|
|
|
366
|
logMetacat.warn("exiting ForceReplicationHandler Thread");
|
|
367
|
}//run
|
|
368
|
}//ForceReplication class
|