I have a list of group names which the app is reading from external .txt.
I want to pass to method as a List <String> group names and to execute dql query something like:
for (String s : groupnames) {
dql = "DROP GROUP " + s;
System.out.println("dropped group: " + s;
}
How to write/execute DQL?
I have done it by myself:
private static void deleteGroups(List<String> groupsToDelete) {
try {
DfClientX clientX = new DfClientX();
IDfQuery query = clientX.getQuery();
for (String s : groupsToDelete){
query.setDQL("DROP GROUP '" + s + "'");
printInfo("Executing DQL: " + query.getDQL());
query.execute(_session, 0);
}
} catch (DfException e) {
printError(e.getMessage());
DfLogger.error("app", "DQL DROP GROUP execution", null,e);
}
}
Not quite sure does CS permit to delete group via DFC but it should be like:
IDfQuery query = new DfQuery();
query.setDQL("DROP GROUP <group_name>");
query.execute(getSession(), IDfQuery.DF_EXEC_QUERY);
There is for sure way to instantiate group object in memory and call .delete() method. I'll try to check it out.
Related
I am trying to restrict the results of my BabelNet query to a specific (Babel)domain. To do that, I'm trying to find out a way to compare the synsets' domains with the domain I need (Geographical). However, I'm having trouble getting the right output, since although the 2 strings match, it still gives me the wrong output. I'm surely doing something wrong here, but I'm out of ideas.
After many trials, the following code was the one that gave me the nearest result to the desired output:
public class GeoRestrict {
public static void main(String[] args) throws IOException {
String file = "/path/to/file/testdata.txt";
BabelNet bn = BabelNet.getInstance();
BufferedReader br = new BufferedReader(new FileReader(file));
String word = null;
while ((word = br.readLine()) != null) {
BabelNetQuery query = new BabelNetQuery.Builder(word)
.build();
List<BabelSynset> wordSynset = bn.getSynsets(query);
for (BabelSynset synset : wordSynset) {
BabelSynsetID id = synset.getID();
System.out.println("\n" + "Synset ID for " + word.toUpperCase() + " is: " + id);
HashMap<Domain, Double> domains = synset.getDomains();
Set<Domain> keys = domains.keySet();
String keyString = domains.keySet().toString();
List<String> categories = synset.getDomains().keySet().stream()
.map(domain -> ((BabelDomain) domain).getDomainString())
.collect(Collectors.toList());
for (String category : categories) {
if(keyString.equals(category)) {
System.out.println("The word " + word + " has the domain " + category);
} else {
System.out.println("Nada! " + category);
}
}
}
}
br.close();
}
}
The output looks like this:
Synset ID for TURIN is: bn:00077665n
Nada! Geography and places
Any ideas on how to solve this issue?
I found my own error. For the sake of completeness I'm posting it.
The BabelDomain needs to be declared and specified (before the while-loop), like this:
BabelDomain domain = BabelDomain.GEOGRAPHY_AND_PLACES;
createChannel method returns null when implementing group chat using applozic sdk, android.
List<String> channelMembersList = new ArrayList<String>();
channelMembersList.add(p.getMobile());
channelMembersList.add("9567600846");
channelMembersList.add("8089117582");
final ChannelInfo channelInfo = new ChannelInfo("GroupName",channelMembersList);
channelInfo.setType(Channel.GroupType.PRIVATE.getValue().intValue());
runOnUiThread(new Runnable() {
#Override
public void run() {
channel = ChannelService.getInstance(WelcomeActivity.this).createChannel(channelInfo);
}
});
here, channel object is always null although the ChannelInfo object is created.Someone please do help...
We added an async task you can use this async task for creating a group/channel pass the details like group members, group name and some details are optional.
UPDATE:
AlChannelCreateAsyncTask.TaskListenerInterface channelCreateTaskListener = new AlChannelCreateAsyncTask.TaskListenerInterface() {
#Override
public void onSuccess(Channel channel, Context context) {
Log.i("Group","Group response :"+channel);
}
#Override
public void onFailure(ChannelFeedApiResponse channelFeedApiResponse, Context context) {
}
};
List<String> groupMembersUserIdList = new ArrayList<>();
groupMembersUserIdList.add("user1");
groupMembersUserIdList.add("user2");
groupMembersUserIdList.add("user3");//Note:while creating group exclude logged in userId from list
ChannelInfo channelInfo = new ChannelInfo("Group name",groupMembersUserIdList);
channelInfo.setType(Channel.GroupType.PUBLIC.getValue().intValue()); //group type
channelInfo.setImageUrl(""); //pass group image link URL
//channelInfo.setChannelMetadata(channelMetadata); //Optional option for setting group meta data
//channelInfo.setClientGroupId(clientGroupId); //Optional if you have your own groupId then you can pass here
AlChannelCreateAsyncTask channelCreateAsyncTask = new AlChannelCreateAsyncTask(context,channelInfo,channelCreateTaskListener);
channelCreateAsyncTask.execute();
Creating Group with applozic
Create a group with a specific group type
Channel.GroupType.PRIVATE.getValue().intValue()
Public group with type : Channel.GroupType.PUBLIC.getValue().intValue()
Open group with type : Channel.GroupType.OPEN.getValue().intValue()
Note: Group meta data is optional
Setting group meta data for messages like created group, left group, removed from group, group deleted, group icon changed and group name changed.
Note: If the channel meta data is set as empty String, no notification is sent to other users in the group/channel.
ChannelMetadata channelMetadata = new ChannelMetadata();
channelMetadata.setCreateGroupMessage(ChannelMetadata.ADMIN_NAME + " created " + ChannelMetadata.GROUP_NAME);
channelMetadata.setAddMemberMessage(ChannelMetadata.ADMIN_NAME + " added " + ChannelMetadata.USER_NAME);
channelMetadata.setRemoveMemberMessage(ChannelMetadata.ADMIN_NAME + " removed " + ChannelMetadata.USER_NAME);
channelMetadata.setGroupNameChangeMessage(ChannelMetadata.USER_NAME + " changed group name " + ChannelMetadata.GROUP_NAME);
channelMetadata.setJoinMemberMessage(ChannelMetadata.USER_NAME + " joined");
channelMetadata.setGroupLeftMessage(ChannelMetadata.USER_NAME + " left group " + ChannelMetadata.GROUP_NAME);
channelMetadata.setGroupIconChangeMessage(ChannelMetadata.USER_NAME + " changed icon");
channelMetadata.setDeletedGroupMessage(ChannelMetadata.ADMIN_NAME + " deleted group " + ChannelMetadata.GROUP_NAME);
Following place holders will be replaced
ChannelMetadata.ADMIN_NAME : admin name of the group
ChannelMetadata.USER_NAME : user name of the user
ChannelMetadata.GROUP_NAME : group name
Please check the docs for this https://www.applozic.com/docs/android-chat-sdk.html
In 5.34 version
ChannelService.getInstance(WelcomeActivity.this).createChannel(channelInfo) assign variable of AlResponse.
and AlResponse is null after ChannelService.getInstance(WelcomeActivity.this).createChannel(channelInfo)
I need to show elements on a table depending on the element (Person) clicked on another table. The problem is that, using a Service, if the user clicks on two elements of the first table very quickly, the data of the two elements is showed in the table, and I only want to show the data from the last one clicked. Hope you can help me.
Here is my code:
personTable.getSelectionModel().selectedItemProperty().addListener(
(observable, oldValue, newValue) -> {
try {
contactoTable.setPlaceholder(new Label("Cargando..."));
showPersonDetails(newValue);
} catch (SQLException ex) {
Logger.getLogger(PersonOverviewController.class.getName()).log(Level.SEVERE, null, ex);
}
});
And showPersonDatails:
contactoTable.setVisible(true);
contactoTable.getItems().clear();
firstNameLabel.setText(person.getFirstName());
lastNameLabel.setText(person.getLastName());
mailLabel.setText(person.getMail());
phoneLabel.setText(person.getPhone());
descriptionLabel.setText(person.getDescription());
service = new Service<Void>() {
#Override
protected Task<Void> createTask() {
return new Task<Void>() {
#Override
protected Void call() throws Exception {
//Background work
DBManager db = new DBManager();
String query = "SELECT * FROM eventos";
ResultSet r = db.executeSelect(query);
contactoTable.getItems().clear();
contactoData.clear();
while (r.next()) {
String q = "SELECT * FROM " + r.getString("Nombre").replace(" ", "_") + " WHERE Nombre = '" + person.getFirstName() + "' AND Apellidos = '" + person.getLastName() + "' AND Correo = '" + person.getMail() + "'";
ResultSet result = db.executeSelect(q);
while (result.next()) {
contactoData.add(new Row(r.getString("Nombre"), result.getString("Asistencia")));
}
}
final CountDownLatch latch = new CountDownLatch(1);
Platform.runLater(() -> {
try {
//FX Stuff done here
contactoTable.setPlaceholder(new Label("No invitado a ningún evento"));
contactoTable.setItems(contactoData);
} finally {
latch.countDown();
}
});
latch.await();
//Keep with the background work
return null;
}
};
}
};
service.start();
You are referencing the same data list (contactoData) from multiple threads, with apparently no synchronization on the list. If the user selects two different items in rapid succession, you launch a service for each one, each service running its task in a different thread. Consequently you have no control over the order the two different threads perform their (multiple) manipulations on contactoData. For example, it is possible (even probable) that the order for two services executing asynchronously is:
First service clears the list
Second service clears the list
First service adds elements to the list
Second service adds elements to the list
and in this case the list contains elements generated by both services, not just one of them.
So you should have your tasks operate on, and return, a new list they create. Then process that list on the FX Application Thread.
It's also not clear why you need a service here, as you only seem to ever use each service once. You may as well just use a task directly.
You also probably want to ensure that the last selection is the one displayed. Since the tasks are running asynchronously, it's possible that if two tasks were started in quick succession, the second would complete before the first. This would result in the second selection being displayed, and then the first selection replacing it. You can avoid this by doing the UI update in an onSucceeded handler, and canceling any current task when you start a new one (thus preventing the currently-executing task from invoking its onSucceeded handler).
Finally, it's really not clear to me why you are making the task wait until the UI is updated.
Here is an updated version of your code:
private Task<List<Row>> updateContactTableTask ;
// ...
private void showPersonDetails(Person person) {
contactoTable.getItems().clear();
firstNameLabel.setText(person.getFirstName());
lastNameLabel.setText(person.getLastName());
mailLabel.setText(person.getMail());
phoneLabel.setText(person.getPhone());
descriptionLabel.setText(person.getDescription());
if (updateContactTableTask != null && updateContactTableTask.isRunning()) {
updateContactTableTask.cancel();
}
updateContactTableTask = new Task<List<Row>>() {
#Override
protected List<Row> call() throws Exception {
List<Row> resultList = new ArrayList<>() ;
//Background work
DBManager db = new DBManager();
String query = "SELECT * FROM eventos";
ResultSet r = db.executeSelect(query);
// quit if we got canceled here...
if (isCancelled()) {
return resultList;
}
while (r.next() && ! isCancelled()) {
// Note: building a query like this is inherently unsafe
// You should use a PreparedStatement in your DBManager class instead
String q = "SELECT * FROM " + r.getString("Nombre").replace(" ", "_") + " WHERE Nombre = '" + person.getFirstName() + "' AND Apellidos = '" + person.getLastName() + "' AND Correo = '" + person.getMail() + "'";
ResultSet result = db.executeSelect(q);
while (result.next()) {
resultList.add(new Row(r.getString("Nombre"), result.getString("Asistencia")));
}
}
return resultList ;
}
};
updateContactTableTask.setOnSucceeded(e -> {
// not really clear you still need contactoData, but if you do:
contactoData.setAll(updateContactTableTask.getValue());
contactoTable.setPlaceholder(new Label("No invitado a ningún evento"));
contactoTable.setItems(contactoData);
});
updateContactTableTask.setOnFailed(e -> {
// handle database errors here...
});
new Thread(updateContactTableTask).start();
}
As an aside, it's not clear to me if, and if so, how, you are closing your database resources. E.g. the result sets never seem to get closed. This could cause resource leaks. However this is incidental to the question (and relies on knowing how your DBManager class is implemented), so I won't address it here.
I'm using Java to download HTML contents of websites whose URLs are stored in a database. I'd like to put their HTML into database, too.
I'm using Jsoup for this purpose:
public String downloadHTML(String byLink) {
String htmlInPage = "";
try {
Document doc = Jsoup.connect(byLink).get();
htmlInPage = doc.html();
} catch (org.jsoup.UnsupportedMimeTypeException e) {
// process this and some other exceptions
}
return htmlInPage;
}
I'd like to download websites concurrently and use this function:
public void downloadURL(int websiteId, String url,
String categoryName, ExecutorService executorService) {
executorService.submit((Runnable) () -> {
String htmlInPage = downloadHTML(url);
System.out.println("Category: " + categoryName + " " + websiteId + " " + url);
String insertQuery =
"INSERT INTO html_data (website_id, html_contents) VALUES (?,?)";
dbUtils.query(insertQuery, websiteId, htmlInPage);
});
}
dbUtils is my class based on Apache Commons DbUtils. Details are here: http://pastebin.com/iAKXchbQ
And I'm using everything mentioned above in a such way: (List<Object[]> details are explained on pastebin, too)
public static void main(String[] args) {
DbUtils dbUtils = new DbUtils("host", "db", "driver", "user", "pass");
List<String> categoriesList =
Arrays.asList("weapons", "planes", "cooking", "manga");
String sql = "SELECT lw.id, lw.website_url, category_name " +
"FROM list_of_websites AS lw JOIN list_of_categories AS lc " +
"ON lw.category_id = lc.id " +
"where category_name = ? ";
ExecutorService executorService = Executors.newFixedThreadPool(10);
for (String category : categoriesList) {
List<Object[]> sitesInCategory = dbUtils.select(sql, category );
for (Object[] entry : sitesInCategory) {
int websiteId = (int) entry[0];
String url = (String) entry[1];
String categoryName = (String) entry[2];
downloadURL(websiteId, url, categoryName, executorService);
}
}
executorService.shutdown();
}
I'm not sure if this solution is correct but it works. Now I want to modify code to save HTML not from all websites in my database, but only their fixed ammount in each category.
For example, download and save HTML of 50 websites from the "weapons" category, 50 from "planes", etc. I don't think it's necessary to use sql for this purpose: if we select 50 sites per category, it doesn't mean we save them all, because of possibly incorrect syntax and connection problems.
I've tryed to create separate class implementing Runnable with fields: counter and maxWebsitesPerCategory, but these variables aren't updated. Another idea was to create field Map<String,Integer> sitesInCategory instead of counter, put each category as a key there and increment its value until it reaches maxWebsitesPerCategory, but it didn't work, too. Please, help me!
P.S: I'll also be grateful for any recommendations connected with my realization of concurrent downloading (I haven't worked with concurrency in Java before and this is my first attempt)
How about this?
for (String category : categoriesList) {
dbUtils.select(sql, category).stream()
.limit(50)
.forEach(entry -> {
int websiteId = (int) entry[0];
String url = (String) entry[1];
String categoryName = (String) entry[2];
downloadURL(websiteId, url, categoryName, executorService);
});
}
sitesInCategory has been replaced with a stream of at most 50 elements, then your code is run on each entry.
EDIT
In regard to comments. I've gone ahead and restructured a bit, you can modify/implement the content of the methods I've suggested.
public void werk(Queue<Object[]> q, ExecutorService executorService) {
executorService.submit(() -> {
try {
Object[] o = q.remove();
try {
String html = downloadHTML(o); // this takes one of your object arrays and returns the text of an html page
insertIntoDB(html); // this is the code in the latter half of your downloadURL method
}catch (/*narrow exception type indicating download failure*/Exception e) {
werk(q, executorService);
}
}catch (NoSuchElementException e) {}
});
}
^^^ This method does most of the work.
for (String category : categoriesList) {
Queue<Object[]> q = new ConcurrentLinkedQueue<>(dbUtils.select(sql, category));
IntStream.range(0, 50).forEach(i -> werk(q, executorService));
}
^^^ this is the for loop in your main
Now each category tries to download 50 pages, upon failure of downloading a page it moves on and tries to download another page. In this way, you will either download 50 pages or have attempted to download all pages in the category.
I am getting too many deadlocks on OrientDb while I am using Java API to query the vertices. After the deadlock happens, the entire database becomes unresponsive and I have to kill the daemon and start again. As example, the error that I get from deadlocks is :
com.orientechnologies.common.concur.OTimeoutException: Can not lock record for 2000 ms. seems record is deadlocked by other record
at com.orientechnologies.orient.core.storage.impl.local.OAbstractPaginatedStorage.acquireReadLock(OAbstractPaginatedStorage.java:1300)
at com.orientechnologies.orient.core.tx.OTransactionAbstract.lockRecord(OTransactionAbstract.java:120)
at com.orientechnologies.orient.core.id.ORecordId.lock(ORecordId.java:282)
at com.orientechnologies.orient.core.storage.impl.local.OAbstractPaginatedStorage.lockRecord(OAbstractPaginatedStorage.java:1776)
at com.orientechnologies.orient.core.storage.impl.local.OAbstractPaginatedStorage.readRecord(OAbstractPaginatedStorage.java:1416)
at com.orientechnologies.orient.core.storage.impl.local.OAbstractPaginatedStorage.readRecord(OAbstractPaginatedStorage.java:694)
at com.orientechnologies.orient.core.db.document.ODatabaseDocumentTx.executeReadRecord(ODatabaseDocumentTx.java:1569)
at com.orientechnologies.orient.core.tx.OTransactionNoTx.loadRecord(OTransactionNoTx.java:80)
at com.orientechnologies.orient.core.db.document.ODatabaseDocumentTx.load(ODatabaseDocumentTx.java:1434)
at com.orientechnologies.orient.server.network.protocol.binary.ONetworkProtocolBinary.readRecord(ONetworkProtocolBinary.java:1456)
at com.orientechnologies.orient.server.network.protocol.binary.ONetworkProtocolBinary.executeRequest(ONetworkProtocolBinary.java:346)
at com.orientechnologies.orient.server.network.protocol.binary.OBinaryNetworkProtocolAbstract.execute(OBinaryNetworkProtocolAbstract.java:216)
at com.orientechnologies.common.thread.OSoftThread.run(OSoftThread.java:65)
Following is the block that I use to query edges and create associations between vertices
public User generateFriend(String mobile, String userRID) {
StringBuilder errorMsg = new StringBuilder();
Iterable<OrientVertex> vertexes;
//Retrieve friends of the user
List<User> friendsList = new ArrayList<User>();
vertexes = db.queryVertices("select expand( unionAll(inE('E_Friend').out,outE('E_Friend').in) ) from " + userRID,errorMsg);
if (!errorMsg.toString().equals("")) {
throw new DbException("Db exception occured, " + errorMsg);
}
for (OrientVertex v : vertexes){
friendsList.add(vertexToUser(v));
}
//Create edges if between the user and other users with mobile number in the list and if the edge is not yet created
User u = findUserByMobileNo(friendsList,mobile);
if ( u == null){
u = findByMobileNo(mobile);
if (u != null) {
//create edge
db.executeQuery("select createEdge('E_Friend','" + userRID + "','" + u.getRid() + "') from " + userRID, new HashMap<String, Object>(), errorMsg);
if (!errorMsg.toString().equals("")) {
throw new DbException("Db exception occured, " + errorMsg);
}
}
}
return u;
}
public Iterable<OrientVertex> queryVertices(String query, StringBuilder errMsg){
logger.error("before getGraph, " + errMsg.toString());
graph = getGraph(errMsg);
if (!errMsg.toString().equals("")){
return null;
}
logger.error("after getGraph, " + errMsg.toString());
Iterable<OrientVertex> vertices = null;
try {
OSQLSynchQuery<OrientVertex> qr = new OSQLSynchQuery<OrientVertex>(query);
vertices = graph.command(qr).execute();
logger.error("after graph command execute, " + errMsg.toString());
}
catch (Exception ex){
errMsg.append(ex.getMessage());
logger.error("graph command exception, " + errMsg.toString());
}
logger.error("before return vertices, " + errMsg.toString());
return vertices;
}
public List<ODocument> executeQuery(String sql, HashMap<String,Object> params,StringBuilder errMsg) {
List<ODocument> result = new ArrayList<ODocument>();
try {
db = getDatabase(errMsg);
if (!errMsg.toString().equals("")){
return null;
}
OSQLSynchQuery<ODocument> query = new OSQLSynchQuery<ODocument>(sql);
if (params.isEmpty()) {
result = db.command(query).execute();
} else {
result = db.command(query).execute(params);
}
} catch (Exception e) {
errMsg.append(e.getMessage());
//TODO: Add threaded error log saving mechanism
}
return result;
}
Due to index missing on table deadlock come, so check your all table which are involved in this operation and find out that indexes are present or not on column.
Refer link in which I have a same problem of deadlock.