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, String> stringsPassedToProcessAsync = new HashMap<>();
33 protected void setCompletableFuture(CompletableFuture<Void> cf)
37 cfMap.put(getId(), cf);
40 protected CompletableFuture<Void> getCompletableFuture()
42 if (cf == null && getId() != null && cfMap.get(getId()) != null)
43 cf = cfMap.get(getId());
47 protected void setId(String id)
52 protected void setIdExtension(String idExtension)
54 setId(getPath() + "::" + idExtension);
57 protected String getId()
63 * Override the three methods
64 * initialise (get parameters, set id (extension), set cf if using an existing one)
65 * process (what to do in the cf if not using an existing one)
66 * finalise (extra stuff to do at the end of the first call to this)
68 protected void initialise(HttpServletRequest request,
69 HttpServletResponse response)
71 // should be overridden
72 // must setId(request, extension)
76 protected abstract void processAsync(HttpServletRequest request,
77 HttpServletResponse response, final Map<String, String> finalMap);
79 protected void finalise(HttpServletRequest request,
80 HttpServletResponse response)
86 public void processEndpoint(HttpServletRequest request,
87 HttpServletResponse response)
90 initialise(request, response);
92 if (checkStatus(request, response, Status.STARTED))
94 returnStatus(response);
98 if (getCompletableFuture() == null)
100 final Map<String, String> finalMap = stringsPassedToProcessAsync;
101 setCompletableFuture(CompletableFuture.runAsync(() -> {
103 this.processAsync(request, response, finalMap);
106 finaliseCompletableFuture();
109 finalise(request, response);
111 returnStatus(response);
112 changeStatus(Status.IN_PROGRESS);
115 protected void atEnd()
120 * Shared methods below here
123 protected String setId(HttpServletRequest request, String extension)
125 String idString = request.getParameter("id");
126 if (idString == null)
128 setIdExtension(extension);
137 protected void changeStatus(Status status)
140 // don't change a job's status if it has finished or died
141 if (getStatus() == Status.FINISHED || getStatus() == Status.ERROR)
143 getAPI().getStatusMap().put(id, status);
146 protected Status getStatus()
148 return getAPI().getStatusMap().get(getId());
151 protected void returnStatus(HttpServletResponse response)
156 PrintWriter writer = response.getWriter();
159 writer.write("id=" + id + "\n");
161 if (getAPI().getRequestMap().get(id) != null)
163 writer.write("request="
164 + getAPI().getRequestMap().get(id).toString() + "\n");
166 if (getStatus() != null)
168 if (getStatus() == Status.ERROR)
170 response.setStatus(500);
172 writer.write("status=" + getStatus().toString() + "\n");
174 } catch (IOException e)
180 protected boolean checkStatus(HttpServletRequest request,
181 HttpServletResponse response)
183 return checkStatus(request, response, null);
186 protected boolean checkStatus(HttpServletRequest request,
187 HttpServletResponse response, Status set)
190 Status status = getStatus();
195 getAPI().getRequestMap().put(id, request.getRequestURI());
204 protected void finaliseCompletableFuture()
207 cf.whenComplete((Void, e) -> {
210 Cache.error("Endpoint job " + id + " did not complete");
212 changeStatus(Status.ERROR);
216 Cache.info("Endpoint job " + id + " completed successfully");
217 changeStatus(Status.FINISHED);