root / web_client / src / gr / grnet / pithos / web / client / rest / GetCommand.java @ f55cf326
History | View | Annotate | Download (10.2 kB)
1 |
/*
|
---|---|
2 |
* Copyright 2011 GRNET S.A. All rights reserved.
|
3 |
*
|
4 |
* Redistribution and use in source and binary forms, with or
|
5 |
* without modification, are permitted provided that the following
|
6 |
* conditions are met:
|
7 |
*
|
8 |
* 1. Redistributions of source code must retain the above
|
9 |
* copyright notice, this list of conditions and the following
|
10 |
* disclaimer.
|
11 |
*
|
12 |
* 2. Redistributions in binary form must reproduce the above
|
13 |
* copyright notice, this list of conditions and the following
|
14 |
* disclaimer in the documentation and/or other materials
|
15 |
* provided with the distribution.
|
16 |
*
|
17 |
* THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
|
18 |
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
19 |
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
20 |
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
|
21 |
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
22 |
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
23 |
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
24 |
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
25 |
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
26 |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
27 |
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
28 |
* POSSIBILITY OF SUCH DAMAGE.
|
29 |
*
|
30 |
* The views and conclusions contained in the software and
|
31 |
* documentation are those of the authors and should not be
|
32 |
* interpreted as representing official policies, either expressed
|
33 |
* or implied, of GRNET S.A.
|
34 |
*/
|
35 |
package gr.grnet.pithos.web.client.rest; |
36 |
|
37 |
import gr.grnet.pithos.web.client.Pithos; |
38 |
import gr.grnet.pithos.web.client.rest.resource.FileResource; |
39 |
import gr.grnet.pithos.web.client.rest.resource.FolderResource; |
40 |
import gr.grnet.pithos.web.client.rest.resource.GroupResource; |
41 |
import gr.grnet.pithos.web.client.rest.resource.GroupUserResource; |
42 |
import gr.grnet.pithos.web.client.rest.resource.GroupsResource; |
43 |
import gr.grnet.pithos.web.client.rest.resource.OtherUserResource; |
44 |
import gr.grnet.pithos.web.client.rest.resource.OthersResource; |
45 |
import gr.grnet.pithos.web.client.rest.resource.RestResource; |
46 |
import gr.grnet.pithos.web.client.rest.resource.SearchResource; |
47 |
import gr.grnet.pithos.web.client.rest.resource.SharedResource; |
48 |
import gr.grnet.pithos.web.client.rest.resource.TagsResource; |
49 |
import gr.grnet.pithos.web.client.rest.resource.TrashResource; |
50 |
import gr.grnet.pithos.web.client.rest.resource.UploadStatusResource; |
51 |
import gr.grnet.pithos.web.client.rest.resource.UserResource; |
52 |
import gr.grnet.pithos.web.client.rest.resource.UserSearchResource; |
53 |
|
54 |
import java.util.HashMap; |
55 |
import java.util.Map; |
56 |
|
57 |
import com.google.gwt.core.client.GWT; |
58 |
import com.google.gwt.http.client.Request; |
59 |
import com.google.gwt.http.client.RequestBuilder; |
60 |
import com.google.gwt.http.client.Response; |
61 |
|
62 |
public abstract class GetCommand<T extends RestResource> extends RestCommand{ |
63 |
|
64 |
boolean complete = false; |
65 |
T result = null;
|
66 |
Throwable exception = null; |
67 |
Class<T> aclass;
|
68 |
private final String path; |
69 |
private String username; |
70 |
private boolean requestSent = false; |
71 |
T cached; |
72 |
|
73 |
private static final long MAX_CACHE_AGE = 1000; |
74 |
|
75 |
private static class RequestData { |
76 |
public String path; |
77 |
public String username; |
78 |
|
79 |
public RequestData(String _path, String _username) { |
80 |
path = _path; |
81 |
username = _username; |
82 |
} |
83 |
|
84 |
@Override
|
85 |
public int hashCode() { |
86 |
final int prime = 31; |
87 |
int result = 1; |
88 |
result = prime * result + ((path == null) ? 0 : path.hashCode()); |
89 |
result = prime * result + ((username == null) ? 0 : username.hashCode()); |
90 |
return result;
|
91 |
} |
92 |
|
93 |
@Override
|
94 |
public boolean equals(Object obj) { |
95 |
if (this == obj) |
96 |
return true; |
97 |
if (obj == null) |
98 |
return false; |
99 |
if (getClass() != obj.getClass())
|
100 |
return false; |
101 |
RequestData other = (RequestData) obj; |
102 |
if (path == null) { |
103 |
if (other.path != null) |
104 |
return false; |
105 |
} else if (!path.equals(other.path)) |
106 |
return false; |
107 |
if (username == null) { |
108 |
if (other.username != null) |
109 |
return false; |
110 |
} else if (!username.equals(other.username)) |
111 |
return false; |
112 |
return true; |
113 |
} |
114 |
} |
115 |
|
116 |
private static class ResponseData { |
117 |
public long timestamp; |
118 |
public Object result; |
119 |
public ResponseData(long _timestamp, Object _result) { |
120 |
timestamp = _timestamp; |
121 |
result = _result; |
122 |
} |
123 |
} |
124 |
|
125 |
private static Map<RequestData, ResponseData> cache = new HashMap<RequestData, ResponseData>(); |
126 |
|
127 |
|
128 |
public GetCommand(Class<T> theclass, String pathToGet, T theCached){ |
129 |
this(theclass, pathToGet, true, theCached); |
130 |
} |
131 |
|
132 |
public GetCommand(Class<T> theclass, String pathToGet, boolean showLoading, T theCached){ |
133 |
setShowLoadingIndicator(showLoading); |
134 |
if(isShowLoadingIndicator())
|
135 |
Pithos.get().showLoadingIndicator("Getting ",pathToGet);
|
136 |
this.aclass = theclass;
|
137 |
if(pathToGet.indexOf("?") != -1) |
138 |
path = pathToGet; |
139 |
else
|
140 |
path =fixPath(pathToGet); |
141 |
this.cached = theCached;
|
142 |
} |
143 |
|
144 |
public GetCommand(Class<T> theclass, String aUsername , String pathToGet, T theCached){ |
145 |
this(theclass, aUsername, pathToGet, true, theCached); |
146 |
} |
147 |
|
148 |
public GetCommand(Class<T> theclass, String aUsername , String pathToGet, boolean showLoading, T theCached){ |
149 |
setShowLoadingIndicator(showLoading); |
150 |
if(isShowLoadingIndicator())
|
151 |
Pithos.get().showLoadingIndicator("Getting ",pathToGet);
|
152 |
this.aclass = theclass;
|
153 |
path = fixPath(pathToGet); |
154 |
this.username = aUsername;
|
155 |
this.cached = theCached;
|
156 |
} |
157 |
|
158 |
private void sendRequest(){ |
159 |
if(requestSent)
|
160 |
return;
|
161 |
requestSent=true;
|
162 |
RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, path);
|
163 |
if(cached!=null && cached.getLastModifiedSince() != null) |
164 |
builder.setHeader("If-Modified-Since", cached.getLastModifiedSince());
|
165 |
try {
|
166 |
if(username == null) |
167 |
handleHeaders(builder, path); |
168 |
else
|
169 |
handleHeaders(username, builder, path); |
170 |
builder.sendRequest("", new RestCallback(path) { |
171 |
|
172 |
@Override
|
173 |
public Object deserialize(Response response) { |
174 |
return deserializeResponse(path, response);
|
175 |
} |
176 |
|
177 |
@Override
|
178 |
public void handleError(Request request, Throwable _exception) { |
179 |
result = null;
|
180 |
complete = true;
|
181 |
exception = _exception; |
182 |
if(_exception instanceof RestException) |
183 |
if(((RestException)_exception).getHttpStatusCode() == 304 && cached != null){ |
184 |
GWT.log("Using cache:"+cached.getUri(), null); |
185 |
handleSuccess(cached); |
186 |
return;
|
187 |
} |
188 |
|
189 |
} |
190 |
|
191 |
@Override
|
192 |
public void handleSuccess(Object object) { |
193 |
result = (T) object; |
194 |
complete = true;
|
195 |
} |
196 |
|
197 |
}); |
198 |
} catch (Exception ex) { |
199 |
complete = true;
|
200 |
exception = ex; |
201 |
} |
202 |
} |
203 |
public boolean isComplete() { |
204 |
return complete;
|
205 |
} |
206 |
|
207 |
public T getResult(){
|
208 |
return result;
|
209 |
} |
210 |
|
211 |
@Override
|
212 |
public boolean execute() { |
213 |
boolean com = isComplete();
|
214 |
RequestData key = new RequestData(path, username);
|
215 |
if (!com) {
|
216 |
if (cache.containsKey(key)) {
|
217 |
ResponseData resp = cache.get(key); |
218 |
if (resp==null) { |
219 |
return true; |
220 |
} |
221 |
|
222 |
// Cache hit
|
223 |
if (System.currentTimeMillis()-resp.timestamp>MAX_CACHE_AGE) { |
224 |
// Cache stale, remove
|
225 |
cache.put(key,null);
|
226 |
} |
227 |
else {
|
228 |
// Use cache data
|
229 |
if(isShowLoadingIndicator())
|
230 |
Pithos.get().hideLoadingIndicator(); |
231 |
if (resp.result instanceof Throwable) { |
232 |
// Error to be handled
|
233 |
Throwable ex = (Throwable) resp.result; |
234 |
onError(ex); |
235 |
return false; |
236 |
} |
237 |
result = (T) resp.result; |
238 |
if (result != null) { |
239 |
onComplete(); |
240 |
} |
241 |
complete = true;
|
242 |
return false; |
243 |
} |
244 |
} |
245 |
|
246 |
if(!requestSent) {
|
247 |
cache.put(key,null);
|
248 |
sendRequest(); |
249 |
} |
250 |
} |
251 |
|
252 |
if(com){
|
253 |
if(isShowLoadingIndicator())
|
254 |
Pithos.get().hideLoadingIndicator(); |
255 |
if(getResult() != null) { |
256 |
// Add to cache
|
257 |
cache.put(key, new ResponseData(System.currentTimeMillis(), getResult())); |
258 |
onComplete(); |
259 |
} |
260 |
else {
|
261 |
cache.put(key, new ResponseData(System.currentTimeMillis(), exception)); |
262 |
onError(exception); |
263 |
} |
264 |
return false; |
265 |
} |
266 |
return true; |
267 |
} |
268 |
|
269 |
public Object deserializeResponse(String aPath, Response response) { |
270 |
RestResource result1 = null;
|
271 |
if(aclass.equals(FolderResource.class)){
|
272 |
result1 = new FolderResource(aPath);
|
273 |
result1.createFromJSON(response.getText()); |
274 |
} |
275 |
else if(aclass.equals(FileResource.class)){ |
276 |
result1 = new FileResource(aPath);
|
277 |
result1.createFromJSON(response.getHeader("X-Pithos-Metadata"));
|
278 |
} |
279 |
else if(aclass.equals(GroupsResource.class)){ |
280 |
result1 = new GroupsResource(aPath);
|
281 |
result1.createFromJSON(response.getText()); |
282 |
} |
283 |
else if(aclass.equals(TrashResource.class)){ |
284 |
result1 = new TrashResource(aPath);
|
285 |
result1.createFromJSON(response.getText()); |
286 |
} |
287 |
else if(aclass.equals(SharedResource.class)){ |
288 |
result1 = new SharedResource(aPath);
|
289 |
result1.createFromJSON(response.getText()); |
290 |
} |
291 |
else if(aclass.equals(OthersResource.class)){ |
292 |
result1 = new OthersResource(aPath);
|
293 |
result1.createFromJSON(response.getText()); |
294 |
} |
295 |
else if(aclass.equals(OtherUserResource.class)){ |
296 |
result1 = new OtherUserResource(aPath);
|
297 |
result1.createFromJSON(response.getText()); |
298 |
} |
299 |
else if(aclass.equals(GroupResource.class)){ |
300 |
result1 = new GroupResource(aPath);
|
301 |
result1.createFromJSON(response.getText()); |
302 |
} |
303 |
else if(aclass.equals(GroupUserResource.class)){ |
304 |
result1 = new GroupUserResource(aPath);
|
305 |
result1.createFromJSON(response.getText()); |
306 |
} |
307 |
else if(aclass.equals(UserResource.class)){ |
308 |
result1 = new UserResource(aPath);
|
309 |
result1.createFromJSON(response.getText()); |
310 |
} |
311 |
else if(aclass.equals(TagsResource.class)){ |
312 |
result1 = new TagsResource(aPath);
|
313 |
result1.createFromJSON(response.getText()); |
314 |
} |
315 |
else if(aclass.equals(SearchResource.class)){ |
316 |
result1 = new SearchResource(aPath);
|
317 |
result1.createFromJSON(response.getText()); |
318 |
} |
319 |
else if(aclass.equals(UserSearchResource.class)){ |
320 |
result1 = new UserSearchResource(aPath);
|
321 |
result1.createFromJSON(response.getText()); |
322 |
} |
323 |
else if(aclass.equals(UploadStatusResource.class)){ |
324 |
result1 = new UploadStatusResource(aPath);
|
325 |
result1.createFromJSON(response.getText()); |
326 |
} |
327 |
return result1;
|
328 |
} |
329 |
|
330 |
public T getCached() {
|
331 |
return cached;
|
332 |
} |
333 |
|
334 |
public void setCached(T theCached) { |
335 |
this.cached = theCached;
|
336 |
} |
337 |
|
338 |
public boolean usedCachedVersion(){ |
339 |
if(exception !=null && exception instanceof RestException) |
340 |
if(((RestException)exception).getHttpStatusCode() == 304){ |
341 |
return true; |
342 |
} |
343 |
return false; |
344 |
} |
345 |
} |