@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String source = req.getParameter("source");
ImagesService imagesService = ImagesServiceFactory.getImagesService();
DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
List<Filter> filters = new ArrayList<Filter>();
Query query = new Query(GAEFeedRepository.FEED_ITEM_KIND);
filters.add(new Query.FilterPredicate("source", FilterOperator.EQUAL, source));
filters.add(new Query.FilterPredicate("img1A", FilterOperator.EQUAL, 1));
filters.add(new Query.FilterPredicate("img2A", FilterOperator.EQUAL, 1));
query.setFilter(CompositeFilterOperator.and(filters));
query.addSort("publishedDate", SortDirection.DESCENDING);
PreparedQuery pq = datastore.prepare(query);
int pageSize = 30;
resp.setContentType("text/html");
resp.getWriter().println(" <ul>");
FetchOptions fetchOptions = FetchOptions.Builder.withLimit(pageSize);
String startCursor = req.getParameter("cursor");
// If this servlet is passed a cursor parameter, let's use it
if (startCursor != null) {
fetchOptions.startCursor(Cursor.fromWebSafeString(startCursor));
}
QueryResultList<Entity> results = pq.asQueryResultList(fetchOptions);
for (Entity entity : results) {
resp.getWriter()
.println(
"<li>"
+ entity.getProperty("imageLink")
+ " / "
+ imagesService.getServingUrl(
ServingUrlOptions.Builder.withBlobKey((BlobKey) entity.getProperty("img2")))
+ " / <img height=40 width=40 src=\""
+ imagesService.getServingUrl(
ServingUrlOptions.Builder.withBlobKey((BlobKey) entity.getProperty("img2")))
+ "\" />");
}
resp.getWriter().println("</li> </entity></ul> ");
String cursor = results.getCursor().toWebSafeString();
// Assuming this servlet lives at '/people'
resp.getWriter()
.println(
"<a href=\"/p8admin/ListFeedItems?cursor="
+ cursor
+ "&source="
+ source
+ "\">Next page</a>");
}
/**
* This method lists all the entities inserted in datastore. It uses HTTP GET method and paging
* support.
*
* @return A CollectionResponse class containing the list of all entities persisted and a cursor
* to the next page.
* @throws UnauthorizedException
*/
@ApiMethod(
name = "findAll",
scopes = {Config.EMAIL_SCOPE},
clientIds = {Config.CHROME_CLIENT_ID, Config.WEB_CLIENT_ID, Config.API_EXPLORER_CLIENT_ID})
public CollectionResponse<ServiceResponse> findAll(
@Named("_name") String _name,
@Nullable @Named("cursor") String cursorString,
@Nullable @Named("limit") Integer limit,
User user)
throws UnauthorizedException {
if (user == null) {
throw new UnauthorizedException("UnauthorizedException # User is Null.");
}
DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
if (limit == null) {
limit = 10;
}
FetchOptions fetchOptions = FetchOptions.Builder.withLimit(limit);
if (cursorString != null) {
fetchOptions.startCursor(Cursor.fromWebSafeString(cursorString));
}
Query q = new Query(_name);
q.addSort("_updatedAt", SortDirection.DESCENDING);
PreparedQuery pq = datastore.prepare(q);
QueryResultList<Entity> results = pq.asQueryResultList(fetchOptions);
List<ServiceResponse> responses = new ArrayList<ServiceResponse>();
ServiceResponse res = null;
for (Entity entity : results) {
res = new ServiceResponse();
// TODO add properties from entity to service response
res.set_id(entity.getKey().getId());
res.set_createdAt((Date) entity.getProperty(_createdAt));
res.set_createdBy((String) entity.getProperty(_createdBy));
res.set_upatedAt((Date) entity.getProperty(_updatedAt));
res.set_updatedBy((String) entity.getProperty(_updatedBy));
res.set_status((String) entity.getProperty(_status));
Text dataText = (Text) entity.getProperty(data);
res.setData(dataText.getValue());
responses.add(res);
}
cursorString = results.getCursor().toWebSafeString();
return CollectionResponse.<ServiceResponse>builder()
.setItems(responses)
.setNextPageToken(cursorString)
.build();
}
public static void iterate(
Query q, long maxElements, int batchSize, Cursor startCursor, Callback callback) {
batchSize = (int) Math.min(Math.min(maxElements, batchSize), 1000);
DatastoreService ds = DatastoreServiceFactory.getDatastoreService();
PreparedQuery pq = ds.prepare(q);
QueryResultList<Entity> list = null;
if (startCursor == null) {
list = pq.asQueryResultList(withLimit(batchSize));
} else {
list = pq.asQueryResultList(withLimit(batchSize).startCursor(startCursor));
}
long totalElements = 0;
Cursor cursor = list.getCursor();
while (totalElements < maxElements && list.size() > 0) {
for (Entity entity : list) {
totalElements++;
try {
callback.withEntity(
entity,
DatastoreServiceFactory.getDatastoreService(),
list.getCursor(),
totalElements);
} catch (Exception e) {
System.err.println(e.getMessage());
e.printStackTrace();
break;
}
if (totalElements >= maxElements) break;
}
if (totalElements >= maxElements) break;
// wait before fetching new data
try {
Thread.sleep(WAIT);
} catch (InterruptedException e) {
System.err.println(e.getMessage());
}
list =
pq.asQueryResultList(
withLimit((int) Math.min(batchSize, maxElements - totalElements))
.startCursor(cursor));
cursor = list.getCursor();
}
}