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.Console;
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 Console.info("Something went wrong with async endpoint execution"
121 addWhenCompleteCompletableFuture();
124 finalise(request, response);
126 returnStatus(response);
127 changeStatus(Status.IN_PROGRESS);
130 protected void atEnd()
134 protected String finishedResponseString(HttpServletRequest request,
135 HttpServletResponse response)
141 * Shared methods below here
144 protected String setId(HttpServletRequest request, String extension)
146 String idString = request.getParameter("id");
147 if (idString == null)
149 setIdExtension(extension);
158 protected void changeStatus(Status status)
161 // don't change a job's status if it has finished or died
162 if (getStatus() == Status.FINISHED || getStatus() == Status.ERROR)
165 if (status != Status.NOT_RUN)
166 API.getStatusMap().put(id, status);
169 protected Status getStatus()
171 Status status = API.getStatusMap().get(getId());
172 return status == null ? tempStatus : status;
175 protected void returnStatus(HttpServletResponse response)
177 returnStatus(null, response, null);
180 protected void returnStatus(HttpServletRequest request,
181 HttpServletResponse response, String message)
186 PrintWriter writer = response.getWriter();
189 writer.write("id=" + id + "\n");
191 if (API.getRequestMap().get(id) != null)
194 "request=" + API.getRequestMap().get(id).toString() + "\n");
196 if (getStatus() != null)
201 response.setStatus(HttpServletResponse.SC_ACCEPTED);
204 response.setStatus(HttpServletResponse.SC_ACCEPTED);
207 response.setStatus(HttpServletResponse.SC_CREATED);
210 response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
214 writer.write("status=" + getStatus().toString() + "\n");
218 writer.write(message);
220 } catch (IOException e)
222 Console.debug("Exception writing to REST response", e);
226 protected boolean checkStatus(HttpServletRequest request,
227 HttpServletResponse response)
229 return checkStatus(request, response, null);
232 protected boolean checkStatus(HttpServletRequest request,
233 HttpServletResponse response, Status set)
236 Status status = getStatus();
241 API.getRequestMap().put(id, request.getRequestURI());
250 protected void addWhenCompleteCompletableFuture()
253 cf.whenComplete((Void, e) -> {
256 Console.error("Endpoint job " + id + " did not complete", e);
257 changeStatus(Status.ERROR);
261 Console.info("Endpoint job " + id + " completed successfully");
262 changeStatus(Status.FINISHED);
269 protected void returnError(HttpServletRequest request,
270 HttpServletResponse response, String message)
272 changeStatus(Status.NOT_RUN);
273 super.returnError(request, response, message);
277 protected boolean deleteFromCache()