1 | package eu.clarin.cmdi.mdservice.action; |
---|
2 | |
---|
3 | import java.io.IOException; |
---|
4 | import java.io.InputStream; |
---|
5 | import java.io.StringWriter; |
---|
6 | import java.util.ArrayList; |
---|
7 | import java.util.Collections; |
---|
8 | import java.util.HashMap; |
---|
9 | import java.util.Iterator; |
---|
10 | import java.util.Map; |
---|
11 | import java.util.Set; |
---|
12 | import java.util.Map.Entry; |
---|
13 | import org.w3c.dom.Document; |
---|
14 | import org.w3c.dom.Node; |
---|
15 | import javax.xml.transform.TransformerFactory; |
---|
16 | import javax.xml.transform.dom.DOMSource; |
---|
17 | import javax.xml.transform.stream.StreamResult; |
---|
18 | import java.io.ByteArrayInputStream; |
---|
19 | |
---|
20 | import javax.servlet.http.HttpServletRequest; |
---|
21 | |
---|
22 | import org.apache.log4j.Logger; |
---|
23 | import org.apache.struts2.interceptor.ServletRequestAware; |
---|
24 | |
---|
25 | import com.opensymphony.xwork2.ActionSupport; |
---|
26 | |
---|
27 | import eu.clarin.cmdi.mdservice.internal.Cache; |
---|
28 | import eu.clarin.cmdi.mdservice.internal.Helpers; |
---|
29 | import eu.clarin.cmdi.mdservice.internal.MDTransformer; |
---|
30 | import eu.clarin.cmdi.mdservice.internal.NoStylesheetException; |
---|
31 | import eu.clarin.cmdi.mdservice.model.Diagnostic; |
---|
32 | import eu.clarin.cmdi.mdservice.model.Diagnostics; |
---|
33 | import eu.clarin.cmdi.mdservice.model.WorkspaceProfile; |
---|
34 | import eu.clarin.cmdi.mdservice.proxy.ProxyInterface; |
---|
35 | |
---|
36 | |
---|
37 | |
---|
38 | /** |
---|
39 | * main Struts2 controller (ie implemenets the struts' execute()-method), all other Actions are derived from. |
---|
40 | * Defines the methods used for retrieving the data |
---|
41 | * and provides basic implementation where possible. |
---|
42 | * Also responsible for caching and transformation of the result. |
---|
43 | * |
---|
44 | * @author vronk |
---|
45 | */ |
---|
46 | public class GenericAction extends ActionSupport |
---|
47 | implements ServletRequestAware |
---|
48 | { |
---|
49 | public static Logger log = Logger.getLogger("GenericAction"); |
---|
50 | private static final long serialVersionUID = 1L; |
---|
51 | |
---|
52 | |
---|
53 | private Diagnostics diagnostics; |
---|
54 | /** |
---|
55 | * Properties to be filled by Struts with according request-parameters |
---|
56 | */ |
---|
57 | private String actionkey = "generic"; |
---|
58 | private String q; |
---|
59 | |
---|
60 | private String actionContentType; |
---|
61 | private String userMsg; |
---|
62 | private HttpServletRequest request; |
---|
63 | private long duration = 0; |
---|
64 | private InputStream resultStream; |
---|
65 | private InputStream sourceStream; |
---|
66 | |
---|
67 | private Map<String,String[]> params; |
---|
68 | |
---|
69 | private ProxyInterface target_proxy; |
---|
70 | |
---|
71 | |
---|
72 | public ProxyInterface getTargetProxy() { |
---|
73 | return target_proxy; |
---|
74 | } |
---|
75 | |
---|
76 | public void setTargetProxy(ProxyInterface proxy) { |
---|
77 | target_proxy = proxy; |
---|
78 | target_proxy.setSourceAction(this); |
---|
79 | } |
---|
80 | |
---|
81 | /** |
---|
82 | * Empty implementation, subclasses have to decide themselves, which proxy to take. |
---|
83 | */ |
---|
84 | public void setTargetProxy() { |
---|
85 | } |
---|
86 | |
---|
87 | public Diagnostics getDiagnostics(){ |
---|
88 | if (diagnostics == null){ |
---|
89 | diagnostics = new Diagnostics(); |
---|
90 | } |
---|
91 | return this.diagnostics; |
---|
92 | } |
---|
93 | |
---|
94 | public void setDiagnostics(Diagnostics diagnostics){ |
---|
95 | this.diagnostics = diagnostics; |
---|
96 | } |
---|
97 | |
---|
98 | public String getQ() { |
---|
99 | /* |
---|
100 | if (q == null) { |
---|
101 | return ""; |
---|
102 | } else { |
---|
103 | return q; |
---|
104 | } |
---|
105 | */ |
---|
106 | return q; |
---|
107 | } |
---|
108 | |
---|
109 | public void setQ(String q) { |
---|
110 | //if (q == null) q=""; |
---|
111 | this.q = q; |
---|
112 | } |
---|
113 | |
---|
114 | public String getActionkey() { |
---|
115 | return actionkey; |
---|
116 | } |
---|
117 | |
---|
118 | public void setActionkey(String actionKey) { |
---|
119 | actionkey = actionKey; |
---|
120 | } |
---|
121 | |
---|
122 | public String getRecordPacking() { |
---|
123 | return getParam("recordPacking"); |
---|
124 | } |
---|
125 | public String getFormat() { |
---|
126 | return getParam("x-cmd-format"); |
---|
127 | } |
---|
128 | public String getCache() { |
---|
129 | return getParam("x-cmd-cache"); |
---|
130 | } |
---|
131 | public String getRepository() { |
---|
132 | return getParam("x-cmd-repository"); |
---|
133 | } |
---|
134 | public String getLang() { |
---|
135 | return getParam("x-cmd-lang"); |
---|
136 | } |
---|
137 | public String getCollections() { |
---|
138 | return getParam("x-cmd-collections"); |
---|
139 | } |
---|
140 | public String getColumns() { |
---|
141 | return getParam("x-cmd-columns"); |
---|
142 | } |
---|
143 | public String getQuery() { |
---|
144 | return getParam("query"); |
---|
145 | } |
---|
146 | public String getStartRecord() { |
---|
147 | return getParam("startRecord"); |
---|
148 | } |
---|
149 | public String getMaximumRecords() { |
---|
150 | return getParam("maximumRecords"); |
---|
151 | } |
---|
152 | public String getMaxdepth() { |
---|
153 | return getParam("x-cmd-maxdepth"); |
---|
154 | } |
---|
155 | |
---|
156 | |
---|
157 | /** |
---|
158 | * is used in struts.xml to dynamically set the mime-type of the result, depending on the format-parameter |
---|
159 | * @return |
---|
160 | */ |
---|
161 | public String getActionContentType() { |
---|
162 | if (this.getFormat().toLowerCase().startsWith("html")) { |
---|
163 | this.actionContentType = "text/html"; |
---|
164 | //this.actionContentType = "application/xhtml+xml"; |
---|
165 | } else { |
---|
166 | this.actionContentType = "text/xml"; |
---|
167 | } |
---|
168 | |
---|
169 | return actionContentType; |
---|
170 | } |
---|
171 | |
---|
172 | public void setActionContentType(String actionContentType) { |
---|
173 | this.actionContentType = actionContentType; |
---|
174 | } |
---|
175 | |
---|
176 | |
---|
177 | public String getFullFormat() { |
---|
178 | return actionkey + "2" + getFormat(); |
---|
179 | } |
---|
180 | |
---|
181 | |
---|
182 | /** |
---|
183 | * TODO: this should be replaced by the diagnostics-mechanism |
---|
184 | * @return |
---|
185 | */ |
---|
186 | public String getUserMsg() { |
---|
187 | return userMsg; |
---|
188 | } |
---|
189 | |
---|
190 | public void setUserMsg(String userMsg) { |
---|
191 | this.userMsg = this.userMsg + "\n" + userMsg; |
---|
192 | } |
---|
193 | |
---|
194 | /** |
---|
195 | * TODO: check what this does, where it is used? |
---|
196 | * @return |
---|
197 | */ |
---|
198 | @Override |
---|
199 | public void setServletRequest(HttpServletRequest arg0) { |
---|
200 | request = arg0; |
---|
201 | } |
---|
202 | |
---|
203 | public HttpServletRequest getServletRequest() { |
---|
204 | return request; |
---|
205 | } |
---|
206 | |
---|
207 | /** |
---|
208 | * The stream holding the resulting data to be sent back to the user as response |
---|
209 | * @return |
---|
210 | */ |
---|
211 | public InputStream getResultStream() { |
---|
212 | return resultStream; |
---|
213 | } |
---|
214 | public void setResultStream(InputStream _resultStream){ |
---|
215 | resultStream = _resultStream; |
---|
216 | } |
---|
217 | public void setSourceStream(InputStream _sourceStream){ |
---|
218 | sourceStream = _sourceStream; |
---|
219 | } |
---|
220 | |
---|
221 | |
---|
222 | /** |
---|
223 | * Get the sourceStream from the target proxy |
---|
224 | * @return |
---|
225 | * @throws IOException |
---|
226 | * @throws NoStylesheetException |
---|
227 | */ |
---|
228 | public InputStream getSourceStream() throws IOException, NoStylesheetException { |
---|
229 | return getTargetProxy().getSourceStream(); |
---|
230 | } |
---|
231 | |
---|
232 | /** |
---|
233 | * Reads in all the parameters of the request into an internal structure. |
---|
234 | * the Map is not Map<String,String>, but rather Map<String,String[]>, |
---|
235 | * ie the value is an array of Strings! |
---|
236 | * http://download.oracle.com/docs/cd/E17802_01/webservices/webservices/docs/1.5/api/javax/servlet/ServletRequest.html#getParameterMap%28%29 |
---|
237 | * |
---|
238 | * This shall allow more flexibility in using the parameters in the subclasses (and less getter/setter stuff) |
---|
239 | * at the cost of circumventing the Struts-way. |
---|
240 | */ |
---|
241 | public void addParam(String key, String value){ |
---|
242 | String[] sarr = new String[1]; |
---|
243 | sarr[0] = value; |
---|
244 | params.put(key, sarr); |
---|
245 | } |
---|
246 | |
---|
247 | /* |
---|
248 | * sru params |
---|
249 | * /* |
---|
250 | * version |
---|
251 | * operation |
---|
252 | * query |
---|
253 | * scanClause |
---|
254 | * startRecord |
---|
255 | * maximumRecords |
---|
256 | * recordPacking |
---|
257 | * recordSchema |
---|
258 | * recordXPath |
---|
259 | * resultSetTTL |
---|
260 | * sortKeys |
---|
261 | * stylesheet |
---|
262 | * x-cmd-repository |
---|
263 | * x-cmd-collections |
---|
264 | * x-cmd-columns |
---|
265 | * x-cmd-lang |
---|
266 | * x-cmd-format |
---|
267 | * x-cmd-cache |
---|
268 | * x-cmd-maxdepth |
---|
269 | */ |
---|
270 | @SuppressWarnings("unchecked") |
---|
271 | protected void loadParams() { |
---|
272 | params = new HashMap(getServletRequest().getParameterMap()); |
---|
273 | |
---|
274 | if (getQ() != null) { |
---|
275 | addParam("q",getQ()); |
---|
276 | } |
---|
277 | |
---|
278 | // set defaults |
---|
279 | if ( params.get("version") == null){ |
---|
280 | addParam("version","1.2"); |
---|
281 | } |
---|
282 | if ( params.get("operation") == null){ |
---|
283 | addParam("operation","searchRetrieve"); |
---|
284 | } |
---|
285 | if ( params.get("query") == null){ |
---|
286 | addParam("query",getParam("q")); |
---|
287 | } |
---|
288 | if ( params.get("startRecord") == null){ |
---|
289 | addParam("startRecord","1"); |
---|
290 | } |
---|
291 | if ( params.get("maximumRecords") == null){ |
---|
292 | addParam("maximumRecords","50"); |
---|
293 | } |
---|
294 | if ( params.get("x-cmd-maxdepth") == null){ |
---|
295 | addParam("x-cmd-maxdepth","2"); |
---|
296 | } |
---|
297 | if ( params.get("x-cmd-repository") == null){ |
---|
298 | addParam("x-cmd-repository", WorkspaceProfile.getRepositoryByIndex(0)); |
---|
299 | } |
---|
300 | if ( params.get("x-cmd-cache") == null){ |
---|
301 | addParam("x-cmd-cache",Cache.SKIP); |
---|
302 | } |
---|
303 | if ( params.get("x-cmd-lang") == null){ |
---|
304 | addParam("x-cmd-lang","en"); |
---|
305 | } |
---|
306 | if ( params.get("x-cmd-format") == null){ |
---|
307 | addParam("x-cmd-format","xml"); |
---|
308 | } |
---|
309 | } |
---|
310 | |
---|
311 | public Map<String,String[]> getParams() { |
---|
312 | return params; |
---|
313 | } |
---|
314 | |
---|
315 | |
---|
316 | /** |
---|
317 | * This is for simplified access to the the values of the request-parameters |
---|
318 | * They are stored in the parameters-map as a String-array, |
---|
319 | * but in most(?) situations, we expect just a simple string. |
---|
320 | * @param key |
---|
321 | * @return |
---|
322 | */ |
---|
323 | public String getParam(String key) { |
---|
324 | String v = ""; |
---|
325 | if (!(params.get(key)==null)) v=(String)params.get(key)[0]; |
---|
326 | return v; |
---|
327 | } |
---|
328 | |
---|
329 | public String[] getParamArray(String key) { |
---|
330 | String[] a = null; |
---|
331 | if (!(params.get(key)==null)) a=(String[])params.get(key); |
---|
332 | return a; |
---|
333 | } |
---|
334 | |
---|
335 | /** |
---|
336 | * Constructs an unambiguous key for the request (encoding all the parameters). |
---|
337 | * This is used as identifier for caching |
---|
338 | * @return key unambiguously encoding the request |
---|
339 | */ |
---|
340 | |
---|
341 | public String getRequestKey() { |
---|
342 | String key=""; |
---|
343 | if (getActionkey()!=null) { |
---|
344 | key += getActionkey() + "//-" ; |
---|
345 | }else { |
---|
346 | key +="//-" ; |
---|
347 | } |
---|
348 | if (getQuery()!=null) { |
---|
349 | key += getQuery() + "//-" ; |
---|
350 | } else { |
---|
351 | key +="//-" ; |
---|
352 | } |
---|
353 | if (getCollections()!=null) { |
---|
354 | key += getCollections() + "//-"; |
---|
355 | } else { |
---|
356 | key +="//-" ; |
---|
357 | } |
---|
358 | if (this.getStartRecord()!=null) { |
---|
359 | key += getStartRecord() + "//-"; |
---|
360 | } |
---|
361 | else{ |
---|
362 | key +="//-" ; |
---|
363 | } |
---|
364 | if (getMaximumRecords()!=null) { |
---|
365 | key += getMaximumRecords() + "//-"; |
---|
366 | } |
---|
367 | else{ |
---|
368 | key +="//-" ; |
---|
369 | } |
---|
370 | |
---|
371 | key += getRepository() + "//-"; |
---|
372 | key += getMaxdepth() + "//-"; |
---|
373 | |
---|
374 | if (getLang()!=null) { |
---|
375 | key += getLang() + "//-"; |
---|
376 | }else{ |
---|
377 | key +="//-" ; |
---|
378 | } |
---|
379 | |
---|
380 | return key; |
---|
381 | } |
---|
382 | |
---|
383 | |
---|
384 | public String addDurationKey(){ |
---|
385 | String req_key = getRequestKey(); |
---|
386 | |
---|
387 | Double duration_d; |
---|
388 | |
---|
389 | duration_d = (double)duration; |
---|
390 | duration_d = duration_d/1000.0; |
---|
391 | req_key += duration_d + "//-"; |
---|
392 | return req_key; |
---|
393 | } |
---|
394 | |
---|
395 | /* |
---|
396 | private static final Map<String, String> xsl_map; |
---|
397 | static { |
---|
398 | Map<String, String> aMap = new HashMap<String,String>(); |
---|
399 | aMap.put("fullformat","format"); |
---|
400 | //aMap.put("format","fullformat"); |
---|
401 | aMap.put("columns", "cols"); |
---|
402 | aMap.put("maximumItems","maximumItems"); |
---|
403 | aMap.put("startItem", "startItem"); |
---|
404 | aMap.put("lang","lang"); |
---|
405 | aMap.put("q", "q"); |
---|
406 | aMap.put("repository","repository_name"); |
---|
407 | //aMap.put("repository_type", "repository_type"); |
---|
408 | xsl_map = Collections.unmodifiableMap(aMap); |
---|
409 | } |
---|
410 | |
---|
411 | public Map<String,String> createTransformerParams(){ |
---|
412 | |
---|
413 | Map<String, String> map = new HashMap<String, String>(); |
---|
414 | |
---|
415 | Set<Entry<String, String[]>> set = getParams().entrySet(); |
---|
416 | Iterator<Entry<String, String[]>> i = set.iterator(); |
---|
417 | |
---|
418 | while(i.hasNext()){ |
---|
419 | Map.Entry<String,String[]> e = (Map.Entry<String,String[]>)i.next(); |
---|
420 | if (xsl_map.containsKey((String)e.getKey())) { |
---|
421 | map.put(xsl_map.get((String)e.getKey()), (String)e.getValue()[0]); |
---|
422 | } |
---|
423 | |
---|
424 | } |
---|
425 | return map; |
---|
426 | } |
---|
427 | |
---|
428 | public Map<String,String> createTransformerParams(){ |
---|
429 | |
---|
430 | HashMap<String,String> hm = new HashMap<String,String>(); |
---|
431 | |
---|
432 | if (getFullFormat() != null){ |
---|
433 | hm.put("format", getFullFormat()); |
---|
434 | } |
---|
435 | |
---|
436 | if (getColumns() != null){ |
---|
437 | hm.put("cols", getColumns()); |
---|
438 | } else { |
---|
439 | hm.put("cols", ""); |
---|
440 | } |
---|
441 | if (getStartItem() != null){ |
---|
442 | hm.put("startItem", getStartItem()); |
---|
443 | } |
---|
444 | if (getMaximumItems() != null){ |
---|
445 | hm.put("maximumItems", getMaximumItems()); |
---|
446 | } |
---|
447 | if (getLang() != null){ |
---|
448 | hm.put("lang", getLang()); |
---|
449 | } |
---|
450 | if (getQ() != null){ |
---|
451 | hm.put("q", getQ()); |
---|
452 | } |
---|
453 | //if (getRepository() != null){ |
---|
454 | hm.put("repository_name", String.valueOf(getRepository())); |
---|
455 | hm.put("repository_type", WorkspaceProfile.getRepositoryType(this.getRepository())); |
---|
456 | //} |
---|
457 | |
---|
458 | return hm; |
---|
459 | } |
---|
460 | */ |
---|
461 | |
---|
462 | /** |
---|
463 | * This is the work-horse function. |
---|
464 | * It does two things: |
---|
465 | * a) check if the source data is already in cache (based on cache-key that is constructed from the request parameters) |
---|
466 | * b) if format-parameter provided, invokes the transformation. |
---|
467 | * at the end the data to be returned as result is contained in the resultStream |
---|
468 | * If format is xml, then the data from sourceStream is passed further as resultStream. |
---|
469 | * |
---|
470 | * @throws Exception This is handled by struts (is mapped to some result in struts.xml based on the Exception-Class) |
---|
471 | */ |
---|
472 | |
---|
473 | public void prepare() throws Exception { |
---|
474 | |
---|
475 | loadParams(); |
---|
476 | setTargetProxy(); |
---|
477 | getTargetProxy().checkParams(); |
---|
478 | |
---|
479 | String req_key = getRequestKey(); |
---|
480 | log.debug("request_key: " + req_key); |
---|
481 | log.debug("params.size: " + params.size()); |
---|
482 | log.debug(getActionkey() + ".targetURL: " + getTargetProxy().getTargetRequest() + " .format:" + getFullFormat()); |
---|
483 | |
---|
484 | // Caching |
---|
485 | String xcid; |
---|
486 | |
---|
487 | if (getCache().equals(Cache.SKIP)) { |
---|
488 | |
---|
489 | sourceStream = getSourceStream(); |
---|
490 | |
---|
491 | } else { |
---|
492 | if (getCache().equals(Cache.USE)) { |
---|
493 | sourceStream = Cache.getCache().getFromCache(req_key); |
---|
494 | } |
---|
495 | if (sourceStream == null) { // either not in cache or cache_flag=refresh |
---|
496 | //sourceStream = getTargetRequest().openStream(); |
---|
497 | long startMillis = System.currentTimeMillis(); |
---|
498 | sourceStream = getSourceStream(); |
---|
499 | duration = System.currentTimeMillis() - startMillis; |
---|
500 | req_key = addDurationKey(); |
---|
501 | |
---|
502 | long now = System.currentTimeMillis(); |
---|
503 | xcid = Cache.getCache().putInCache(req_key,sourceStream); |
---|
504 | //Admin.notifyUser("putting in cache: " + req_key); |
---|
505 | sourceStream = Cache.getCache().getFromCache(req_key); |
---|
506 | } /* else { |
---|
507 | Admin.notifyUser("reading from cache: " + req_key); |
---|
508 | } */ |
---|
509 | } |
---|
510 | |
---|
511 | // add diagnostics |
---|
512 | if (getDiagnostics().Exists()){ |
---|
513 | Document doc ; |
---|
514 | Node r_element; |
---|
515 | // fatal error |
---|
516 | //TODO getDiagnostics().Exists("fatal"); |
---|
517 | if (sourceStream == null){ |
---|
518 | //TODO rootelemname ??? |
---|
519 | doc = Helpers.createDocument("rootelemname"); |
---|
520 | r_element = doc.getFirstChild(); |
---|
521 | } else { |
---|
522 | doc = Helpers.getDocument(sourceStream); |
---|
523 | //TODO tagname by class |
---|
524 | r_element= doc.getElementsByTagName("searchRetrieveResponse").item(0); |
---|
525 | } |
---|
526 | |
---|
527 | Document ddoc = getDiagnostics().buildXMLDocument(); |
---|
528 | Node d_element= ddoc.getElementsByTagName("diagnostics").item(0); |
---|
529 | doc.adoptNode(d_element); |
---|
530 | r_element.appendChild(d_element); |
---|
531 | DOMSource source = new DOMSource(doc); |
---|
532 | StringWriter xmlAsWriter = new StringWriter(); |
---|
533 | StreamResult result = new StreamResult(xmlAsWriter); |
---|
534 | TransformerFactory.newInstance().newTransformer().transform(source, result); |
---|
535 | this.setSourceStream(new ByteArrayInputStream(xmlAsWriter.toString().getBytes("UTF-8"))); |
---|
536 | } |
---|
537 | |
---|
538 | |
---|
539 | if (getFormat().equals("xml")) { |
---|
540 | resultStream = sourceStream; |
---|
541 | }else { |
---|
542 | MDTransformer transformer = new MDTransformer(); |
---|
543 | // set URL as srcFile (for MDTransformer to pass to xsl-scripts) |
---|
544 | // TODO: WHY?? |
---|
545 | transformer.setSrcFile(getTargetProxy().getTargetRequest()); |
---|
546 | //transformer.setParams(createTransformerParams()); |
---|
547 | transformer.setParams(getParams()); |
---|
548 | // here the transformation is invoked |
---|
549 | resultStream = transformer.transformXML(sourceStream); |
---|
550 | } |
---|
551 | |
---|
552 | log.debug(getActionkey() + " success:" + (resultStream!=null)); |
---|
553 | } |
---|
554 | |
---|
555 | /** |
---|
556 | * default Action method that gets called by Struts. Everything interesting happens in prepare() |
---|
557 | */ |
---|
558 | public String execute() throws Exception { |
---|
559 | // HttpServletRequest request = ServletActionContext.getRequest(); |
---|
560 | //Admin.notifyUser("session-attrs:"); |
---|
561 | //Admin.notifyUser(getServletRequest().getRemoteUser() ); |
---|
562 | //Admin.notifyUser(String.valueOf(getSession())); |
---|
563 | |
---|
564 | long now = System.currentTimeMillis(); |
---|
565 | |
---|
566 | prepare(); |
---|
567 | long duration = (System.currentTimeMillis() - now); |
---|
568 | //duration |
---|
569 | |
---|
570 | if (resultStream == null) { |
---|
571 | return ERROR; |
---|
572 | } else { |
---|
573 | return SUCCESS; |
---|
574 | } |
---|
575 | } |
---|
576 | |
---|
577 | |
---|
578 | } |
---|