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)
75 this.setId(request, null);
77 this.saveParameters(request);
80 protected void saveParameters(HttpServletRequest request)
83 this.getFromId(request);
84 this.getEndpointPathParameters(request);
85 this.getQueryParameters(request);
86 this.getOptions(request);
89 protected abstract void processAsync(HttpServletRequest request,
90 HttpServletResponse response, final Map<String, Object> finalMap);
92 protected void finalise(HttpServletRequest request,
93 HttpServletResponse response)
99 public void processEndpoint(HttpServletRequest request,
100 HttpServletResponse response)
104 initialise(request, response);
106 if (checkStatus(request, response, Status.STARTED))
108 String alreadyFinishedString = null;
109 if (getStatus() == Status.FINISHED)
111 alreadyFinishedString = finishedResponseString(request, response);
113 returnStatus(request, response, alreadyFinishedString);
117 if (getCompletableFuture() == null)
119 final Map<String, Object> finalObjectMap = objectsPassedToProcessAsync;
120 setCompletableFuture(CompletableFuture.runAsync(() -> {
124 this.processAsync(request, response, finalObjectMap);
125 } catch (ClassCastException e)
127 Console.info("Something went wrong with async endpoint execution"
132 addWhenCompleteCompletableFuture();
135 finalise(request, response);
137 returnStatus(response);
138 changeStatus(Status.IN_PROGRESS);
141 protected void atEnd()
145 protected String finishedResponseString(HttpServletRequest request,
146 HttpServletResponse response)
152 * Shared methods below here
155 protected String setId(HttpServletRequest request, String extension)
157 String idString = getId(request);
158 Console.debug("GOT ID '" + idString + "'");
159 if (idString == null)
161 setIdExtension(extension);
170 protected void changeStatus(Status status)
173 // don't change a job's status if it has finished or died
174 if (getStatus() == Status.FINISHED || getStatus() == Status.ERROR)
177 if (status != Status.NOT_RUN)
178 API.getStatusMap().put(id, status);
181 protected Status getStatus()
183 Status status = API.getStatusMap().get(getId());
184 return status == null ? tempStatus : status;
187 protected void returnStatus(HttpServletResponse response)
189 returnStatus(null, response, null);
192 protected void returnStatus(HttpServletRequest request,
193 HttpServletResponse response, String message)
198 PrintWriter writer = response.getWriter();
201 writer.write("id=" + id + "\n");
203 if (API.getRequestMap().get(id) != null)
206 "request=" + API.getRequestMap().get(id).toString() + "\n");
208 if (getStatus() != null)
213 response.setStatus(HttpServletResponse.SC_ACCEPTED);
216 response.setStatus(HttpServletResponse.SC_ACCEPTED);
219 response.setStatus(HttpServletResponse.SC_CREATED);
222 response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
226 writer.write("status=" + getStatus().toString() + "\n");
230 writer.write(message);
232 } catch (IOException e)
234 Console.debug("Exception writing to REST response", e);
238 protected boolean checkStatus(HttpServletRequest request,
239 HttpServletResponse response)
241 return checkStatus(request, response, null);
244 protected boolean checkStatus(HttpServletRequest request,
245 HttpServletResponse response, Status set)
248 Status status = getStatus();
253 API.getRequestMap().put(id, request.getRequestURI());
262 protected void addWhenCompleteCompletableFuture()
265 cf.whenComplete((Void, e) -> {
268 Console.error("Endpoint job " + id + " did not complete", e);
269 changeStatus(Status.ERROR);
273 Console.info("Endpoint job " + id + " completed successfully");
274 changeStatus(Status.FINISHED);
281 protected void returnError(HttpServletRequest request,
282 HttpServletResponse response, String message)
284 changeStatus(Status.NOT_RUN);
285 super.returnError(request, response, message);
289 protected boolean deleteFromCache()