3 import java.io.IOException;
4 import java.io.PrintWriter;
5 import java.util.HashMap;
7 import java.util.concurrent.CompletableFuture;
9 import javax.servlet.http.HttpServletRequest;
10 import javax.servlet.http.HttpServletResponse;
12 import jalview.bin.Cache;
13 import jalview.rest.RestHandler.Status;
15 public abstract class AbstractEndpointAsync extends AbstractEndpoint
17 public AbstractEndpointAsync(API api, String path, String name,
18 String parameters, String description)
20 super(api, path, name, parameters, description);
23 protected String idExtension = null;
25 protected String id = null;
27 protected CompletableFuture<Void> cf = null;
29 protected Map<String, CompletableFuture<Void>> cfMap = new HashMap<>();
31 protected Map<String, Object> objectsPassedToProcessAsync = new HashMap<>();
33 private Status tempStatus = null;
35 protected void setCompletableFuture(CompletableFuture<Void> cf)
39 cfMap.put(getId(), cf);
42 protected CompletableFuture<Void> getCompletableFuture()
44 if (cf == null && getId() != null && cfMap.get(getId()) != null)
45 cf = cfMap.get(getId());
49 protected void setId(String id)
54 protected void setIdExtension(String idExtension)
56 setId(getPath() + "::" + idExtension);
59 protected String getId()
65 * Override the three methods
66 * initialise (get parameters, set id (extension), set cf if using an existing one)
67 * process (what to do in the cf if not using an existing one)
68 * finalise (extra stuff to do at the end of the first call to this)
70 protected void initialise(HttpServletRequest request,
71 HttpServletResponse response)
73 // should be overridden
74 // must setId(request, extension)
78 protected abstract void processAsync(HttpServletRequest request,
79 HttpServletResponse response, final Map<String, Object> finalMap);
81 protected void finalise(HttpServletRequest request,
82 HttpServletResponse response)
88 public void processEndpoint(HttpServletRequest request,
89 HttpServletResponse response)
93 initialise(request, response);
95 if (checkStatus(request, response, Status.STARTED))
97 String alreadyFinishedString = null;
98 if (getStatus() == Status.FINISHED)
100 alreadyFinishedString = finishedResponseString(request, response);
102 returnStatus(request, response, alreadyFinishedString);
106 if (getCompletableFuture() == null)
108 final Map<String, Object> finalObjectMap = objectsPassedToProcessAsync;
109 setCompletableFuture(CompletableFuture.runAsync(() -> {
113 this.processAsync(request, response, finalObjectMap);
114 } catch (ClassCastException e)
116 Cache.info("Something went wrong with async endpoint execution"
122 addWhenCompleteCompletableFuture();
125 finalise(request, response);
127 returnStatus(response);
128 changeStatus(Status.IN_PROGRESS);
131 protected void atEnd()
135 protected String finishedResponseString(HttpServletRequest request,
136 HttpServletResponse response)
142 * Shared methods below here
145 protected String setId(HttpServletRequest request, String extension)
147 String idString = request.getParameter("id");
148 if (idString == null)
150 setIdExtension(extension);
159 protected void changeStatus(Status status)
162 // don't change a job's status if it has finished or died
163 if (getStatus() == Status.FINISHED || getStatus() == Status.ERROR)
166 if (status != Status.NOT_RUN)
167 API.getStatusMap().put(id, status);
170 protected Status getStatus()
172 Status status = API.getStatusMap().get(getId());
173 return status == null ? tempStatus : status;
176 protected void returnStatus(HttpServletResponse response)
178 returnStatus(null, response, null);
181 protected void returnStatus(HttpServletRequest request,
182 HttpServletResponse response, String message)
187 PrintWriter writer = response.getWriter();
190 writer.write("id=" + id + "\n");
192 if (API.getRequestMap().get(id) != null)
195 "request=" + API.getRequestMap().get(id).toString() + "\n");
197 if (getStatus() != null)
202 response.setStatus(HttpServletResponse.SC_ACCEPTED);
205 response.setStatus(HttpServletResponse.SC_ACCEPTED);
208 response.setStatus(HttpServletResponse.SC_CREATED);
211 response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
215 writer.write("status=" + getStatus().toString() + "\n");
219 writer.write(message);
221 } catch (IOException e)
227 protected boolean checkStatus(HttpServletRequest request,
228 HttpServletResponse response)
230 return checkStatus(request, response, null);
233 protected boolean checkStatus(HttpServletRequest request,
234 HttpServletResponse response, Status set)
237 Status status = getStatus();
242 API.getRequestMap().put(id, request.getRequestURI());
251 protected void addWhenCompleteCompletableFuture()
254 cf.whenComplete((Void, e) -> {
257 Cache.error("Endpoint job " + id + " did not complete");
259 changeStatus(Status.ERROR);
263 Cache.info("Endpoint job " + id + " completed successfully");
264 changeStatus(Status.FINISHED);
271 protected void returnError(HttpServletRequest request,
272 HttpServletResponse response, String message)
274 changeStatus(Status.NOT_RUN);
275 super.returnError(request, response, message);
279 protected boolean deleteFromCache()