svn-gvsig-desktop / branches / v10 / libraries / libFMap / src / com / iver / cit / gvsig / fmap / drivers / db / utils / SingleVectorialDBConnectionManager.java @ 11928
History | View | Annotate | Download (7.75 KB)
1 |
package com.iver.cit.gvsig.fmap.drivers.db.utils; |
---|---|
2 |
|
3 |
import java.util.ArrayList; |
4 |
import java.util.HashMap; |
5 |
import java.util.Iterator; |
6 |
|
7 |
import org.apache.log4j.Logger; |
8 |
|
9 |
import com.iver.cit.gvsig.fmap.drivers.ConnectionFactory; |
10 |
import com.iver.cit.gvsig.fmap.drivers.DBException; |
11 |
import com.iver.cit.gvsig.fmap.drivers.IVectorialDatabaseDriver; |
12 |
import com.iver.cit.gvsig.fmap.drivers.IConnection; |
13 |
import com.iver.cit.gvsig.fmap.layers.LayerFactory; |
14 |
|
15 |
/**
|
16 |
* Utility class to handle connections properly. One connection instance per
|
17 |
* (db, user, gvsig session)
|
18 |
*
|
19 |
* @author jldominguez
|
20 |
*
|
21 |
*/
|
22 |
public class SingleVectorialDBConnectionManager { |
23 |
|
24 |
private static Logger logger = Logger.getLogger(SingleVectorialDBConnectionManager.class.getName()); |
25 |
private static SingleVectorialDBConnectionManager single_instance = null; |
26 |
private HashMap connections = new HashMap(); |
27 |
|
28 |
/**
|
29 |
* Non-public to avoid unwanted instances.
|
30 |
*
|
31 |
*/
|
32 |
protected SingleVectorialDBConnectionManager() {
|
33 |
|
34 |
} |
35 |
|
36 |
/**
|
37 |
* Singleton model to keep single instances.
|
38 |
*
|
39 |
* @return single instance
|
40 |
*/
|
41 |
public static SingleVectorialDBConnectionManager instance() { |
42 |
if (single_instance == null) { |
43 |
single_instance = new SingleVectorialDBConnectionManager();
|
44 |
} |
45 |
return single_instance;
|
46 |
} |
47 |
|
48 |
/**
|
49 |
* Utility metho to find a connection with its parameters
|
50 |
* given the connection object.
|
51 |
*
|
52 |
* @param co the connection object
|
53 |
* @return
|
54 |
*/
|
55 |
public ConnectionWithParams findConnection(IConnection co) {
|
56 |
|
57 |
Iterator iter = connections.keySet().iterator();
|
58 |
while (iter.hasNext()) {
|
59 |
String keyitem = (String) iter.next(); |
60 |
ConnectionWithParams cwp = (ConnectionWithParams) connections.get(keyitem); |
61 |
if (cwp.getConnection() == co) {
|
62 |
return cwp;
|
63 |
} |
64 |
} |
65 |
return null; |
66 |
} |
67 |
|
68 |
|
69 |
/**
|
70 |
* Creates a new connection with its parameters if not created yet.
|
71 |
*
|
72 |
* @param _drvName driver name
|
73 |
* @param _user user name
|
74 |
* @param _pw password
|
75 |
* @param _name connection name
|
76 |
* @param _host host url
|
77 |
* @param _port port number as string
|
78 |
* @param _db database name
|
79 |
* @param _connected whether or not to connect the connection
|
80 |
* @return the connection with parameters object
|
81 |
* @throws SQLException
|
82 |
*/
|
83 |
public ConnectionWithParams getConnection (
|
84 |
String _drvName,
|
85 |
String _user,
|
86 |
String _pw,
|
87 |
String _name,
|
88 |
String _host,
|
89 |
String _port,
|
90 |
String _db,
|
91 |
boolean _connected
|
92 |
) throws DBException {
|
93 |
|
94 |
IVectorialDatabaseDriver drv = getInstanceFromName(_drvName); |
95 |
if (drv==null)return null; |
96 |
String conn_str = drv.getConnectionString(_host, _port, _db, _user, _pw);
|
97 |
|
98 |
String key = getConnectionKey(_drvName, _host, _db, _port, _user);
|
99 |
|
100 |
if (!connections.containsKey(key)) {
|
101 |
|
102 |
ConnectionWithParams cwp = null;
|
103 |
|
104 |
if (_connected) {
|
105 |
IConnection new_connection = null;
|
106 |
new_connection = ConnectionFactory.createConnection(conn_str, _user, _pw); |
107 |
|
108 |
// new_connection.setAutoCommit(false);
|
109 |
|
110 |
cwp = new ConnectionWithParams(
|
111 |
conn_str, |
112 |
new_connection, |
113 |
_drvName, |
114 |
_user, |
115 |
_pw, |
116 |
_name, |
117 |
_host, |
118 |
_port, |
119 |
_db, |
120 |
true);
|
121 |
} else {
|
122 |
|
123 |
cwp = new ConnectionWithParams(
|
124 |
conn_str, |
125 |
null,
|
126 |
_drvName, |
127 |
_user, |
128 |
null,
|
129 |
_name, |
130 |
_host, |
131 |
_port, |
132 |
_db, |
133 |
false);
|
134 |
} |
135 |
connections.put(key, cwp); |
136 |
} |
137 |
|
138 |
ConnectionWithParams _cwp = (ConnectionWithParams) connections.get(key); |
139 |
|
140 |
if (_cwp.getName().compareTo(_name) != 0) { |
141 |
// connections.remove(key);
|
142 |
_cwp.setName(_name); |
143 |
connections.put(key, _cwp); |
144 |
} |
145 |
|
146 |
if ((!_cwp.isConnected()) && (_connected)) {
|
147 |
_cwp.connect(_pw); |
148 |
} |
149 |
|
150 |
return _cwp;
|
151 |
} |
152 |
|
153 |
/**
|
154 |
* Gets available open connections.
|
155 |
*
|
156 |
* @return array of open connections with parameters
|
157 |
*/
|
158 |
public ConnectionWithParams[] getConnectedConnections() { |
159 |
Iterator iter = connections.keySet().iterator();
|
160 |
if (!iter.hasNext()) return null; |
161 |
|
162 |
ArrayList aux = new ArrayList(); |
163 |
|
164 |
while (iter.hasNext()) {
|
165 |
ConnectionWithParams _cwp = |
166 |
(ConnectionWithParams) connections.get(iter.next()); |
167 |
if (_cwp.isConnected()) {
|
168 |
aux.add(_cwp); |
169 |
} |
170 |
} |
171 |
|
172 |
ConnectionWithParams[] resp = new ConnectionWithParams[aux.size()]; |
173 |
for (int i=0; i<aux.size(); i++) { |
174 |
resp[i] = (ConnectionWithParams) aux.get(i); |
175 |
} |
176 |
return resp;
|
177 |
} |
178 |
|
179 |
/**
|
180 |
* Gets all available connections.
|
181 |
*
|
182 |
* @return array of all connections with parameters
|
183 |
*/
|
184 |
public ConnectionWithParams[] getAllConnections() { |
185 |
Iterator iter = connections.keySet().iterator();
|
186 |
if (!iter.hasNext()) return null; |
187 |
|
188 |
ArrayList aux = new ArrayList(); |
189 |
|
190 |
while (iter.hasNext()) {
|
191 |
ConnectionWithParams _cwp = |
192 |
(ConnectionWithParams) connections.get(iter.next()); |
193 |
aux.add(_cwp); |
194 |
} |
195 |
|
196 |
ConnectionWithParams[] resp = new ConnectionWithParams[aux.size()]; |
197 |
for (int i=0; i<aux.size(); i++) { |
198 |
resp[i] = (ConnectionWithParams) aux.get(i); |
199 |
} |
200 |
return resp;
|
201 |
} |
202 |
|
203 |
/**
|
204 |
* Removes connection with its params.
|
205 |
*
|
206 |
* @param _cwp connection with params to be removed
|
207 |
*/
|
208 |
private void removeConnectionWP(ConnectionWithParams _cwp) { |
209 |
|
210 |
ArrayList keysToRemove = new ArrayList(); |
211 |
|
212 |
Iterator iter = connections.keySet().iterator();
|
213 |
while (iter.hasNext()) {
|
214 |
Object key = iter.next();
|
215 |
ConnectionWithParams cwp = (ConnectionWithParams) connections.get(key); |
216 |
if (cwp == _cwp) {
|
217 |
keysToRemove.add(key); |
218 |
} |
219 |
} |
220 |
for (int i=0; i<keysToRemove.size(); i++) { |
221 |
connections.remove(keysToRemove.get(i)); |
222 |
} |
223 |
} |
224 |
|
225 |
|
226 |
/**
|
227 |
* Closes and removes a connection with params object
|
228 |
*
|
229 |
* @param _cwp
|
230 |
* @return whether the connection was actually closed (false if the
|
231 |
* connection was not open at the start)
|
232 |
*/
|
233 |
public boolean closeAndRemove(ConnectionWithParams _cwp) { |
234 |
|
235 |
boolean it_was_open = true; |
236 |
|
237 |
try {
|
238 |
it_was_open = (_cwp.getConnection() != null) && (!_cwp.getConnection().isClosed());
|
239 |
if (_cwp.getConnection() != null) _cwp.getConnection().close(); |
240 |
removeConnectionWP(_cwp); |
241 |
} catch (Exception se) { |
242 |
logger.error("While closing connection: " + se.getMessage(), se);
|
243 |
return false; |
244 |
} |
245 |
logger.info("Connection successfully closed.");
|
246 |
return it_was_open;
|
247 |
} |
248 |
|
249 |
/**
|
250 |
* Called by the extension object when gvsig terminates.
|
251 |
*
|
252 |
*/
|
253 |
public void closeAllBeforeTerminate() { |
254 |
|
255 |
boolean ok = true; |
256 |
String key = ""; |
257 |
ConnectionWithParams cwp = null;
|
258 |
Iterator iter = connections.keySet().iterator();
|
259 |
while (iter.hasNext()) {
|
260 |
key = (String) iter.next();
|
261 |
cwp = (ConnectionWithParams) connections.get(key); |
262 |
|
263 |
if (cwp.getConnection() == null) continue; |
264 |
|
265 |
try {
|
266 |
cwp.getConnection().close(); |
267 |
} catch (DBException se) {
|
268 |
ok = false;
|
269 |
logger.error("While closing connection: " + se.getMessage(), se);
|
270 |
} |
271 |
} |
272 |
|
273 |
connections.clear(); |
274 |
|
275 |
if (ok) {
|
276 |
logger.info("Successfully closed all connections.");
|
277 |
} else {
|
278 |
logger.warn("Problems while closing all connections.");
|
279 |
} |
280 |
} |
281 |
|
282 |
/**
|
283 |
* Gets the objects key to be used in the inner hashmap
|
284 |
* @param _drvName driver name
|
285 |
* @param _host host's url
|
286 |
* @param _db database name
|
287 |
* @param _port port number
|
288 |
* @param _user user name
|
289 |
* @return
|
290 |
*/
|
291 |
private static String getConnectionKey( |
292 |
String _drvName,
|
293 |
String _host,
|
294 |
String _db,
|
295 |
String _port, String _user) { |
296 |
|
297 |
String resp = "_driver_" + _drvName.toLowerCase(); |
298 |
resp = resp + "_host_" + _host.toLowerCase();
|
299 |
resp = resp + "_db_" + _db.toLowerCase(); // ---------------- nueva |
300 |
resp = resp + "_port_" + _port;
|
301 |
resp = resp + "_user_" + _user.toLowerCase();
|
302 |
return resp;
|
303 |
} |
304 |
|
305 |
/**
|
306 |
* Utility method to instantiate a driver given its name.
|
307 |
*
|
308 |
* @param drvname driver name
|
309 |
* @return driver instance
|
310 |
*/
|
311 |
public static IVectorialDatabaseDriver getInstanceFromName(String drvname) { |
312 |
|
313 |
IVectorialDatabaseDriver _driver = null;
|
314 |
try {
|
315 |
_driver = (IVectorialDatabaseDriver) LayerFactory.getDM().getDriver(drvname); |
316 |
} catch (Exception e) { |
317 |
logger.error("While getting driver instance: " + e.getMessage(), e);
|
318 |
} |
319 |
return _driver;
|
320 |
} |
321 |
|
322 |
|
323 |
|
324 |
|
325 |
|
326 |
} |