@PUT
@Consumes(MediaType.APPLICATION_XML)
public Response putTaskData(String value) {
Response res = null;
// add your code here
// first check if the Entity exists in the datastore
DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
MemcacheService syncCache = MemcacheServiceFactory.getMemcacheService();
syncCache.setErrorHandler(ErrorHandlers.getConsistentLogAndContinue(Level.INFO));
Key entKey = KeyFactory.createKey("TaskData", keyname);
Date date = new Date();
try {
// if it is, signal that we updated the entity
Entity ts = datastore.get(entKey);
ts.setProperty("value", value);
ts.setProperty("date", date);
datastore.put(ts);
res = Response.noContent().build();
} catch (EntityNotFoundException e) {
// if it is not, create it and
// signal that we created the entity in the datastore
Entity taskdata = new Entity("TaskData", keyname);
taskdata.setProperty("value", value);
taskdata.setProperty("date", date);
datastore.put(taskdata);
res = Response.created(uriInfo.getAbsolutePath()).build();
}
TaskData td = new TaskData(keyname, value, date);
syncCache.put(keyname, td);
return res;
}
@DELETE
public void deleteIt() {
// delete an entity from the datastore
// just print a message upon exception (don't throw)
DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
MemcacheService syncCache = MemcacheServiceFactory.getMemcacheService();
if (syncCache.get(keyname) != null) {
syncCache.delete(keyname);
}
Key entKey = KeyFactory.createKey("TaskData", keyname);
try {
Entity ent = datastore.get(entKey);
datastore.delete(entKey);
System.err.println("TaskData deleted in Datastore");
} catch (EntityNotFoundException e) {
System.err.println("TaskData not found in Datastore");
}
}
// for the application
@GET
@Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
public TaskData getTaskData() {
// same code as above method
DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
MemcacheService syncCache = MemcacheServiceFactory.getMemcacheService();
if (syncCache.get(keyname) != null) {
TaskData ts = (TaskData) syncCache.get(keyname);
return ts;
}
Key entKey = KeyFactory.createKey("TaskData", keyname);
try {
Entity ent = datastore.get(entKey);
TaskData ts =
new TaskData(keyname, (String) ent.getProperty("value"), (Date) ent.getProperty("date"));
return ts;
} catch (EntityNotFoundException e) {
throw new RuntimeException("Get: TaskData with " + keyname + " not found");
}
}
// for the browser
@GET
@Produces(MediaType.TEXT_XML)
public TaskData getTaskDataHTML() {
// add your code here (get Entity from datastore using this.keyname)
// throw new RuntimeException("Get: TaskData with " + keyname + " not found");
// if not found
DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
MemcacheService syncCache = MemcacheServiceFactory.getMemcacheService();
if (syncCache.get(keyname) != null) {
TaskData ts = (TaskData) syncCache.get(keyname);
return ts;
}
Key entKey = KeyFactory.createKey("TaskData", keyname);
try {
Entity ent = datastore.get(entKey);
TaskData ts =
new TaskData(keyname, (String) ent.getProperty("value"), (Date) ent.getProperty("date"));
return ts;
} catch (EntityNotFoundException e) {
throw new RuntimeException("Get: TaskData with " + keyname + " not found");
}
}
/**
* Mapped to /routesmemcache. GET, POST and DELETE are supported to manipulate Route objects in the
* datastore.
*
* @author Aviral Takkar
* <p>Curl examples:
* <p>GET - curl "http://go-places-ucsb.appspot.com/rest/routesmemcache/{route_id}"
* <p>POST - curl -i -H "Accept: application/json" -H "Content-Type: application/json" -X POST
* --data "{\"origin\":{\"address\":\"santa barbara\"},\"destination\":{\"address\":\"los
* angeles\"}, \"mapJsonAsText\":\"xyz\"}" http://go-places-ucsb.appspot.com/rest/routesmemcache
*/
@Path("/routesmemcache")
public class RoutesMemcacheAPI {
@Context UriInfo uriInfo;
@Context Request request;
Random key = new java.util.Random();
MemcacheService syncCache = MemcacheServiceFactory.getMemcacheService();
@POST
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public String addRoute(Route route, @Context HttpServletResponse servletResponse)
throws IOException {
try {
Entity routeEntity = new Entity("Route");
routeEntity.setProperty("originPlaceID", route.getOrigin().getGooglePlaceId());
routeEntity.setProperty("destinationPlaceID", route.getDestination().getGooglePlaceId());
routeEntity.setProperty("duration", route.getDuration());
routeEntity.setProperty("distance", route.getDistance());
routeEntity.setProperty("origin", route.getOrigin().getAddress());
routeEntity.setProperty("destination", route.getDestination().getAddress());
Text mapJsonAsText = route.getMapJsonAsText();
routeEntity.setProperty("routeJSON", mapJsonAsText);
syncCache.setErrorHandler(ErrorHandlers.getConsistentLogAndContinue(Level.INFO));
String cacheKey = "route-" + key.nextLong();
syncCache.put(cacheKey, routeEntity);
return new JSONObject().append("status", "OK").append("key", cacheKey).toString();
} catch (Exception e) {
return new JSONObject()
.append("status", "fail")
.append("message", "Could not cache object.")
.toString();
}
}
@GET
@Path("{route_id}")
@Produces(MediaType.APPLICATION_JSON)
public String getPlace(@PathParam("route_id") String routeID) {
JSONObject reply = new JSONObject();
try {
syncCache.setErrorHandler(ErrorHandlers.getConsistentLogAndContinue(Level.INFO));
Entity result = (Entity) syncCache.get(routeID);
if (result != null)
return reply
.append("status", "OK")
.append("message", "Found in memcache.")
.append("Route Object", result)
.toString();
return reply.append("status", "fail").append("message", "Not found in memcache.").toString();
} catch (Exception e) {
return new JSONObject()
.append("status", "fail")
.append("message", "Route object with ID " + routeID + " not found.")
.toString();
}
}
@DELETE
@Path("{route_id}")
@Produces(MediaType.APPLICATION_JSON)
public String deletePlace(@PathParam("route_id") String routeID) {
syncCache.setErrorHandler(ErrorHandlers.getConsistentLogAndContinue(Level.INFO));
JSONObject reply = new JSONObject();
try {
syncCache.delete(routeID);
return reply
.append("status", "OK")
.append("message", "successfully deleted route " + routeID + " from " + "memcache")
.toString();
} catch (Exception e) {
return new JSONObject().append("status", "fail").append("message", e.getMessage()).toString();
}
}
}
