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  • proper use of volatile keyword

    - by luke
    I think i have a pretty good idea about the volatile keyword in java, but i'm thinking about re-factoring some code and i thought it would be a good idea to use it. i have a class that is basically working as a DB Cache. it holds a bunch of objects that it has read from a database, serves requests for those objects, and then occasionally refreshes the database (based on a timeout). Heres the skeleton public class Cache { private HashMap mappings =....; private long last_update_time; private void loadMappingsFromDB() { //.... } private void checkLoad() { if(System.currentTimeMillis() - last_update_time > TIMEOUT) loadMappingsFromDB(); } public Data get(ID id) { checkLoad(); //.. look it up } } So the concern is that loadMappingsFromDB could be a high latency operation and thats not acceptable, So initially i thought that i could spin up a thread on cache startup and then just have it sleep and then update the cache in the background. But then i would need to synchronize my class (or the map). and then i would just be trading an occasional big pause for making every cache access slower. Then i thought why not use volatile i could define the map reference as volatile private volatile HashMap mappings =....; and then in get (or anywhere else that uses the mappings variable) i would just make a local copy of the reference: public Data get(ID id) { HashMap local = mappings; //.. look it up using local } and then the background thread would just load into a temp table and then swap the references in the class HashMap tmp; //load tmp from DB mappings = tmp;//swap variables forcing write barrier Does this approach make sense? and is it actually thread-safe?

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  • XmlSerialize a custom collection with an Attribute

    - by roomaroo
    I've got a simple class that inherits from Collection and adds a couple of properties. I need to serialize this class to XML, but the XMLSerializer ignores my additional properties. I assume this is because of the special treatment that XMLSerializer gives ICollection and IEnumerable objects. What's the best way around this? Here's some sample code: using System.Collections.ObjectModel; using System.IO; using System.Xml.Serialization; namespace SerialiseCollection { class Program { static void Main(string[] args) { var c = new MyCollection(); c.Add("Hello"); c.Add("Goodbye"); var serializer = new XmlSerializer(typeof(MyCollection)); using (var writer = new StreamWriter("test.xml")) serializer.Serialize(writer, c); } } [XmlRoot("MyCollection")] public class MyCollection : Collection<string> { [XmlAttribute()] public string MyAttribute { get; set; } public MyCollection() { this.MyAttribute = "SerializeThis"; } } } This outputs the following XML (note MyAttribute is missing in the MyCollection element): <?xml version="1.0" encoding="utf-8"?> <MyCollection xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <string>Hello</string> <string>Goodbye</string> </MyCollection> What I want is <MyCollection MyAttribute="SerializeThis" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <string>Hello</string> <string>Goodbye</string> </MyCollection> Any ideas? The simpler the better. Thanks.

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  • Where'd my sounds go?

    - by Dane Man
    In my Row class I have the initWithCoder method and everything restored in that method works fine, but only within the method. After the method is called I loose an array of sounds that is in my Row class. The sounds class also has the initWithCoder method, and the sound plays fine but only in the Row class initWithCoder method. After decoding the Row object, the sound array disappears completely and is unable to be called. Here's my source for the initWithCoder: - (id) initWithCoder:(NSCoder *)coder { ... soundArray = [coder decodeObjectForKey:@"soundArray"]; NSLog(@"%d",[soundArray count]); return self; } the log shows the count as 8 like it should (this is while unarchiving). Then the row object I create gets assigned. And the resulting row object no longer has a soundArray. [NSKeyedArchiver archiveRootObject:row toFile:@"DefaultRow"]; ... row = [NSKeyedUnarchiver unarchiveObjectWithFile:@"DefaultRow"]; So now whenever I call the soundArray it crashes. //ERROR IS HERE NSLog(@"%d",[[row soundArray] count]); Help please (soundArray is an NSMutableArray).

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  • NSArrayController not working with NSMutableDictionary for NSTableView

    - by Miraaj
    Hi all, I am trying to display content in NSTableView using NSMutableArrayController of NSMutableDictionary records. I followed steps written below: In application delegate class, I created an NSMutableArray object with name 'geniuses' and stored some NSMutableDictionary objects with keys: 'geniusName' and 'domain'. I took an NSArrayController object in IB, binded its controller content property to application delegate class, and set its model key path to 'geniuses'. In attribute inspector pane set mode as class and class name as NSMutableDictionary. Added keys: 'geniusName' and 'domain' to it. In IB I took a table view object. Binded its content property to array controller, controller key path set as arranged objects. Binded value property of its first column to array controller, controller key path set as arranged objects, model key path set as 'geniusName'. Binded value property of its second column to array controller, controller key path set as arranged objects, model key path set as 'geniusName'. After following these steps when I tried to build and run the project I found un-populated table view. You can find my code here. Can anyone suggest me where I may be wrong? Thanks, Miraaj

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  • loading custom view using loadNibNamed showing memory leaks

    - by user307550
    I have a number of custom table cells and views that I built using interface builder In interface builder, everything is set up similarly. There is a table cell and a couple other UILabels and a background image Object owner if the nib is NSObject Class for the table cell is the name of the class for my table cell Here is how I create the table cell in my code: SectionedSwitchTableCell *cell = nil; NSArray *nibs = [[NSBundle mainBundle] loadNibNamed:kSectionedSwitchTableCellIdentifier owner:owner options:nil]; for(id currentObject in nibs) { if([currentObject isKindOfClass:[SectionedSwitchTableCell class]]) { cell = (SectionedSwitchTableCell *)currentObject; break; } } return cell; For my custom table headers I have this NSArray *nibs = [[NSBundle mainBundle] loadNibNamed:@"CustomTableHeader" owner:self options:nil]; for(id currentObject in nibs) { if([currentObject isKindOfClass:[CustomTableHeader class]]) { return header } } In my .h and .m files for the custom view, I have IBOutlet, @property set up for everything except for the background image UIImageView. Everything that has the IBOutlet and @property are also @synthesized and released in the .m file. Leaks is showing that I have memory leaks with CALayer when I create these custom view objects. Am I doing something wrong here when I create these custom view objects? I'm kind of tearing my hair out trying to figure out where these leaks are coming from. As a side note, I have a UIImageView background image defined in these custom views but I didn't define properties and IBOutlets in my .h and .m files. Defining them doesn't make a difference when I run it through Leaks but just wanted to confirm if I'm doing the right thing. Any input would be super helpful. Thanks :)

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  • Windows-1251 file inside UTF-8 site?

    - by Spoonk
    Hello everyone Masters Of Web Delevopment :) I have a piece of PHP script that fetches last 10 played songs from my winamp. This script is inside file (lets call it "lastplayed.php") which is included in my site with php include function inside a "div". My site is on UTF-8 encoding. The problem is that some songs titles are in Windows-1251 encoding. And in my site they displays like "??????"... Is there any known way to tell to this div with included "lastplayed.php" in it, to be with windows-1251 encoding? Or any other suggestions? P.S: The file with fetching script a.k.a. "lastplayed.php", is converted to UTF-8. But if it is ANCII it's the same result. I try to put and meta tag with windows-1251 between head tag but nothing happens again. P.P.S: Script that fetches the Winamp's data (lastplayed.php): <?php /****** * You may use and/or modify this script as long as you: * 1. Keep my name & webpage mentioned * 2. Don't use it for commercial purposes * * If you want to use this script without complying to the rules above, please contact me first at: [email protected] * * Author: Martijn Korse * Website: http://devshed.excudo.net * * Date: 08-05-2006 ***/ /** * version 2.0 */ class Radio { var $fields = array(); var $fieldsDefaults = array("Server Status", "Stream Status", "Listener Peak", "Average Listen Time", "Stream Title", "Content Type", "Stream Genre", "Stream URL", "Current Song"); var $very_first_str; var $domain, $port, $path; var $errno, $errstr; var $trackLists = array(); var $isShoutcast; var $nonShoutcastData = array( "Server Status" => "n/a", "Stream Status" => "n/a", "Listener Peak" => "n/a", "Average Listen Time" => "n/a", "Stream Title" => "n/a", "Content Type" => "n/a", "Stream Genre" => "n/a", "Stream URL" => "n/a", "Stream AIM" => "n/a", "Stream IRC" => "n/a", "Current Song" => "n/a" ); var $altServer = False; function Radio($url) { $parsed_url = parse_url($url); $this->domain = isset($parsed_url['host']) ? $parsed_url['host'] : ""; $this->port = !isset($parsed_url['port']) || empty($parsed_url['port']) ? "80" : $parsed_url['port']; $this->path = empty($parsed_url['path']) ? "/" : $parsed_url['path']; if (empty($this->domain)) { $this->domain = $this->path; $this->path = ""; } $this->setOffset("Current Stream Information"); $this->setFields(); // setting default fields $this->setTableStart("<table border=0 cellpadding=2 cellspacing=2>"); $this->setTableEnd("</table>"); } function setFields($array=False) { if (!$array) $this->fields = $this->fieldsDefaults; else $this->fields = $array; } function setOffset($string) { $this->very_first_str = $string; } function setTableStart($string) { $this->tableStart = $string; } function setTableEnd($string) { $this->tableEnd = $string; } function getHTML($page=False) { if (!$page) $page = $this->path; $contents = ""; $domain = (substr($this->domain, 0, 7) == "http://") ? substr($this->domain, 7) : $this->domain; if (@$fp = fsockopen($domain, $this->port, $this->errno, $this->errstr, 2)) { fputs($fp, "GET ".$page." HTTP/1.1\r\n". "User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Windows 98)\r\n". "Accept: */*\r\n". "Host: ".$domain."\r\n\r\n"); $c = 0; while (!feof($fp) && $c <= 20) { $contents .= fgets($fp, 4096); $c++; } fclose ($fp); preg_match("/(Content-Type:)(.*)/i", $contents, $matches); if (count($matches) > 0) { $contentType = trim($matches[2]); if ($contentType == "text/html") { $this->isShoutcast = True; return $contents; } else { $this->isShoutcast = False; $htmlContent = substr($contents, 0, strpos($contents, "\r\n\r\n")); $dataStr = str_replace("\r", "\n", str_replace("\r\n", "\n", $contents)); $lines = explode("\n", $dataStr); foreach ($lines AS $line) { if ($dp = strpos($line, ":")) { $key = substr($line, 0, $dp); $value = trim(substr($line, ($dp+1))); if (preg_match("/genre/i", $key)) $this->nonShoutcastData['Stream Genre'] = $value; if (preg_match("/name/i", $key)) $this->nonShoutcastData['Stream Title'] = $value; if (preg_match("/url/i", $key)) $this->nonShoutcastData['Stream URL'] = $value; if (preg_match("/content-type/i", $key)) $this->nonShoutcastData['Content Type'] = $value; if (preg_match("/icy-br/i", $key)) $this->nonShoutcastData['Stream Status'] = "Stream is up at ".$value."kbps"; if (preg_match("/icy-notice2/i", $key)) { $this->nonShoutcastData['Server Status'] = "This is <span style=\"color: red;\">not</span> a Shoutcast server!"; if (preg_match("/ultravox/i", $value)) $this->nonShoutcastData['Server Status'] .= " But an <a href=\"http://ultravox.aol.com/\" target=\"_blank\">Ultravox</a> Server"; $this->altServer = $value; } } } return nl2br($htmlContent); } } else return $contents; } else { return False; } } function getServerInfo($display_array=null, $very_first_str=null) { if (!isset($display_array)) $display_array = $this->fields; if (!isset($very_first_str)) $very_first_str = $this->very_first_str; if ($html = $this->getHTML()) { // parsing the contents $data = array(); foreach ($display_array AS $key => $item) { if ($this->isShoutcast) { $very_first_pos = stripos($html, $very_first_str); $first_pos = stripos($html, $item, $very_first_pos); $line_start = strpos($html, "<td>", $first_pos); $line_end = strpos($html, "</td>", $line_start) + 4; $difference = $line_end - $line_start; $line = substr($html, $line_start, $difference); $data[$key] = strip_tags($line); } else { $data[$key] = $this->nonShoutcastData[$item]; } } return $data; } else { return $this->errstr." (".$this->errno.")"; } } function createHistoryArray($page) { if (!in_array($page, $this->trackLists)) { $this->trackLists[] = $page; if ($html = $this->getHTML($page)) { $fromPos = stripos($html, $this->tableStart); $toPos = stripos($html, $this->tableEnd, $fromPos); $tableData = substr($html, $fromPos, ($toPos-$fromPos)); $lines = explode("</tr><tr>", $tableData); $tracks = array(); $c = 0; foreach ($lines AS $line) { $info = explode ("</td><td>", $line); $time = trim(strip_tags($info[0])); if (substr($time, 0, 9) != "Copyright" && !preg_match("/Tag Loomis, Tom Pepper and Justin Frankel/i", $info[1])) { $this->tracks[$c]['time'] = $time; $this->tracks[$c++]['track'] = trim(strip_tags($info[1])); } } if (count($this->tracks) > 0) { unset($this->tracks[0]); if (isset($this->tracks[1])) $this->tracks[1]['track'] = str_replace("Current Song", "", $this->tracks[1]['track']); } } else { $this->tracks[0] = array("time"=>$this->errno, "track"=>$this->errstr); } } } function getHistoryArray($page="/played.html") { if (!in_array($page, $this->trackLists)) $this->createHistoryArray($page); return $this->tracks; } function getHistoryTable($page="/played.html", $trackColText=False, $class=False) { $title_utf8 = mb_convert_encoding($trackArr ,"utf-8" ,"auto"); if (!in_array($page, $this->trackLists)) $this->createHistoryArray($page); if ($trackColText) $output .= " <div class='lastplayed_top'></div> <div".($class ? " class=\"".$class."\"" : "").">"; foreach ($this->tracks AS $title_utf8) $output .= "<div style='padding:2px 0;'>".$title_utf8['track']."</div>"; $output .= "</div><div class='lastplayed_bottom'></div> <div class='lastplayed_title'>".$trackColText."</div> \n"; return $output; } } // this is needed for those with a php version < 5 // the function is copied from the user comments @ php.net (http://nl3.php.net/stripos) if (!function_exists("stripos")) { function stripos($haystack, $needle, $offset=0) { return strpos(strtoupper($haystack), strtoupper($needle), $offset); } } ?> And the calling script outside the lastplayed.php: include "lastplayed.php"; $radio = new Radio($ip.":".$port); echo $radio->getHistoryTable("/played.html", "<b>Last played:</b>", "lastplayed_content");

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  • Why doesn't this image sprite menu display properly, and why aren't the links working?

    - by briligg
    The code validates. There should be two more images in the menu on the left, above the visible one of the silo. And each should be a link. http://www.briligg.com/agnosticism.html css is: external style sheet: .menu { position: relative; float: left; margin: 10px; padding: 0; width: 150px; } .menu li { margin: 0; padding: 0; list-style: none; position: absolute; left: 0; top: 260px; } .menu li, .menu a { width: 150px; height: 150px; } internal style sheet: .menu { height: 450px; } .mirror { top: 0; } .mirror { background: url(http://www.briligg.com/images/menu-ag.png) 0 0; } .wormcan { top: 151px; } .wormcan { background: url(http://www.briligg.com/images/menu-ag.png) 0 -151px; } .wormsilo { top: 301px; } .wormsilo { background: url(http://www.briligg.com/images/menu-ag.png) 0 -301px; } html: <ul class="menu"> <li class="mirror"> <a href="whoryou.html"></a> </li> <li class="wormcan"> <a href="aroundyou.html"></a> </li> <li class="wormsilo"> <a href="beyondyou.html"></a> </li> </ul>

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  • java applet stops running on exceptions

    - by Marius
    I've developed a simple applet that imports an image from the clipboard. When i run the class file from NetBeans, everything works fine. But when i try to run it as an applet ... it gives me lots of errors in the java console and does not run ... - The applet is signed - There is a static method in one class, called getImageFromClipboard(). When the applet runs, it calls this method. - getImageFromClipboard() method has a try-catch block and suppresses all errors. It simply returns either a BufferedImage or null. - When applet runs, it does some visual adjustments before calling getImageFromClipboard() Now the scenario is as follows: the class from netbeans runs, fails to import the image and adjusts the interface accordingly (displays an error in a label) But when i run it in a browser, java console is filled with errors and nothing after the getImageFromClipboard() line works. Although the applet itself loads and does everything it's supposed do do before importing the image. So why am i getting errors if i accept the certificate and all of the possible errors are in try-catch blocks? None of this code should throw any exceptions. Any ideas why this is happening? Or do you need to see the errors to tell? UPDATE I've managed to find out the problem myself. The class that i'm using is not in the jar file :( How do i add it in? I'm using "add jar folder" in netbeans on the libraries package to import it but it does not seem to get copied to the jar.

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  • Is it possible to add JPA annotation to superclass instance variables?

    - by Kristofer Borgstrom
    Hi, I am creating entities that are the same for two different tables. In order do table mappings etc. different for the two entities but only have the rest of the code in one place - an abstract superclass. The best thing would be to be able to annotate generic stuff such as column names (since the will be identical) in the super class but that does not work because JPA annotations are not inherited by child classes. Here is an example: public abstract class MyAbstractEntity { @Column(name="PROPERTY") //This will not be inherited and is therefore useless here protected String property; public String getProperty() { return this.property; } //setters, hashCode, equals etc. methods } Which I would like to inherit and only specify the child-specific stuff, like annotations: @Entity @Table(name="MY_ENTITY_TABLE") public class MyEntity extends MyAbstractEntity { //This will not work since this field does not override the super class field, thus the setters and getters break. @Column(name="PROPERTY") protected String property; } Any ideas or will I have to create fields, getters and setters in the child classes? Thanks, Kris

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  • Android getting XML values

    - by Nils
    Hello, I have the following XML code, which I got by a UPnP device and like to get the res value - the RTSP URL. In this case rtsp://10.42.0.103:554/live.sdp How can I do this? I heard that Android has some built-in support for reading XML. Is that true? <DIDL-Lite xmlns="urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:upnp="urn:schemas-upnp-org:metadata-1-0/upnp/"> <item id="11" parentID="1" restricted="1"> <dc:title>Network Camera Stream 1</dc:title> <upnp:class>object.item.videoItem</upnp:class> <res protocolInfo="rtsp-rtp-udp:*:video/mpeg4-generic:*" resolution="640x480">rtsp://10.42.0.103:554/live.sdp</res> </item> <item id="12" parentID="1" restricted="1"> <dc:title>Network Camera Stream 2</dc:title> <upnp:class>object.item.videoItem</upnp:class> <res protocolInfo="rtsp-rtp-udp:*:video/mpeg4-generic:*" resolution="176x144">rtsp://10.42.0.103:554/live2.sdp</res> </item> </DIDL-Lite>

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  • order of onclick events

    - by NicoF
    I want to add a jquery click event to href's that already have an onclick event. In the example below the hard coded onclick event will get triggered first. How can I reverse that? <a class="whatever clickyGoal1" href="#" onclick="alert('trial game');">play trial</a> <br /> <a class="whatever clickyGoal2" href="#" onclick="alert('real game');">real trial</a> <p class="goal1"> </p> <p class="goal2"> </p> <script type="text/javascript"> $("a.clickyGoal1").click(function() { $("p.goal1").append("trial button click goal is fired");//example }); $("a.clickyGoal2").click(function() { $("p.goal2").append("real button click goal is fired"); //example }); </script>

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  • VS2010 Implement Generic Interface expansion doesn't use specified type

    - by TJB
    Using the release version of Visual Studio 2010 I think there's a difference in the "Implement Interface" expansion from VS2008 If I speicify an interface and implement it in a class as so: public interface IRepository<T> where T : IModel { T Get<T>(int id); void Update<T>(); int Add<T>(T item); } public class MockRepository : IRepository<MockUser> { // ... } Then use the "Implement Interface" expansion and get this: public class MockRepository : IRepository<MockUser> { public T Get<T>(int id) { throw new NotImplementedException(); } public void Update<T>() { throw new NotImplementedException(); } public int Add<T>(T item) { throw new NotImplementedException(); } } Instead of what I expected public class MockRepository : IRepository<MockUser> { public MockUser Get<MockUser>(int id) { throw new NotImplementedException(); } public void Update<MockUser>() { throw new NotImplementedException(); } public int Add<MockUser>(MockUser item) { throw new NotImplementedException(); } } The IDE uses the type variable name from the generic interface definition T instead of the specified concrete type MockUser. Is this a bug? Or is something new just for VS2010 / .Net 4.0?

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  • Django formset unit test

    - by Py
    I can't running Unit Test with formset. I try to do a test: class NewClientTestCase(TestCase): def setUp(self): self.c = Client() def test_0_create_individual_with_same_adress(self): post_data = { 'ctype': User.CONTACT_INDIVIDUAL, 'username': 'dupond.f', 'email': '[email protected]', 'password': 'pwd', 'password2': 'pwd', 'civility': User.CIVILITY_MISTER, 'first_name': 'François', 'last_name': 'DUPOND', 'phone': '+33 1 34 12 52 30', 'gsm': '+33 6 34 12 52 30', 'fax': '+33 1 34 12 52 30', 'form-0-address1': '33 avenue Gambetta', 'form-0-address2': 'apt 50', 'form-0-zip_code': '75020', 'form-0-city': 'Paris', 'form-0-country': 'FRA', 'same_for_billing': True, } response = self.c.post(reverse('client:full_account'), post_data, follow=True) self.assertRedirects(response, '%s?created=1' % reverse('client:dashboard')) and i have this error: ValidationError: [u'ManagementForm data is missing or has been tampered with'] My view : def full_account(request, url_redirect=''): from forms import NewUserFullForm, AddressForm, BaseArticleFormSet fields_required = [] fields_notrequired = [] AddressFormSet = formset_factory(AddressForm, extra=2, formset=BaseArticleFormSet) if request.method == 'POST': form = NewUserFullForm(request.POST) objforms = AddressFormSet(request.POST) if objforms.is_valid() and form.is_valid(): user = form.save() address = objforms.forms[0].save() if url_redirect=='': url_redirect = '%s?created=1' % reverse('client:dashboard') logon(request, form.instance) return HttpResponseRedirect(url_redirect) else: form = NewUserFullForm() objforms = AddressFormSet() return direct_to_template(request, 'clients/full_account.html', { 'form':form, 'formset': objforms, 'tld_fr':False, }) and my form file : class BaseArticleFormSet(BaseFormSet): def clean(self): msg_err = _('Ce champ est obligatoire.') non_errors = True if 'same_for_billing' in self.data and self.data['same_for_billing'] == 'on': same_for_billing = True else: same_for_billing = False for i in [0, 1]: form = self.forms[i] for field in form.fields: name_field = 'form-%d-%s' % (i, field ) value_field = self.data[name_field].strip() if i == 0 and self.forms[0].fields[field].required and value_field =='': form.errors[field] = msg_err non_errors = False elif i == 1 and not same_for_billing and self.forms[1].fields[field].required and value_field =='': form.errors[field] = msg_err non_errors = False return non_errors class AddressForm(forms.ModelForm): class Meta: model = Address address1 = forms.CharField() address2 = forms.CharField(required=False) zip_code = forms.CharField() city = forms.CharField() country = forms.ChoiceField(choices=CountryField.COUNTRIES, initial='FRA')

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  • Python __subclasses__() not listing subclasses

    - by Mridang Agarwalla
    I cant seem to list all derived classes using the __subclasses__() method. Here's my directory layout: import.py backends __init__.py --digger __init__.py base.py test.py --plugins plugina_plugin.py From import.py i'm calling test.py. test.py in turn iterates over all the files in the plugins directory and loads all of them. test.py looks like this: import os import sys import re sys.path.append(os.path.join(os.path.abspath(os.path.dirname(os.path.abspath( __file__ ))))) sys.path.append(os.path.join(os.path.abspath(os.path.dirname(os.path.abspath( __file__ ))), 'plugins')) from base import BasePlugin class TestImport: def __init__(self): print 'heeeeello' PLUGIN_DIRECTORY = os.path.join(os.path.abspath(os.path.dirname(os.path.abspath( __file__ ))), 'plugins') for filename in os.listdir (PLUGIN_DIRECTORY): # Ignore subfolders if os.path.isdir (os.path.join(PLUGIN_DIRECTORY, filename)): continue else: if re.match(r".*?_plugin\.py$", filename): print ('Initialising plugin : ' + filename) __import__(re.sub(r".py", r"", filename)) print ('Plugin system initialized') print BasePlugin.__subclasses__() The problem us that the __subclasses__() method doesn't show any derived classes. All plugins in the plugins directory derive from a base class in the base.py file. base.py looks like this: class BasePlugin(object): """ Base """ def __init__(self): pass plugina_plugin.py looks like this: from base import BasePlugin class PluginA(BasePlugin): """ Plugin A """ def __init__(self): pass Could anyone help me out with this? Whatm am i doing wrong? I've racked my brains over this but I cant seem to figure it out Thanks.

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  • Using clases in PHP to store function

    - by Artur
    Hello! I need some advise on my PHP code organisation. I need classes where I can store different functions, and I need access to those classes in different parts of my project. Making an object of this classes each time is too sadly, so I've found a two ways have to solve it. First is to use static methods, like class car { public static $wheels_count = 4; public static function change_wheels_count($new_count) { car::$wheels_count = $new_count; } } Second is to use singleton pattern: class Example { // Hold an instance of the class private static $instance; // The singleton method public static function singleton() { if (!isset(self::$instance)) { $c = __CLASS__; self::$instance = new $c; } return self::$instance; } } But author of the article about singletons said, that if I have too much singletons in my code I should reconstruct it. But I need a lot of such classes. Can anybody explain prons and cons of each way? Which is mostly used? Are there more beautiful ways?

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  • Turning a JSON list into a POJO

    - by Josh L
    I'm having trouble getting this bit of JSON into a POJO. I'm using Jackson configured like this: protected ThreadLocal<ObjectMapper> jparser = new ThreadLocal<ObjectMapper>(); public void receive(Object object) { try { if (object instanceof String && ((String)object).length() != 0) { ObjectDefinition t = null ; if (parserChoice==0) { if (jparser.get()==null) { jparser.set(new ObjectMapper()); } t = jparser.get().readValue((String)object, ObjectDefinition.class); } Object key = t.getKey(); if (key == null) return; transaction.put(key,t); } } catch (Exception e) { e.printStackTrace(); } } Here's the JSON that needs to be turned into a POJO: { "id":"exampleID1", "entities":{ "tags":[ { "text":"textexample1", "indices":[ 2, 14 ] }, { "text":"textexample2", "indices":[ 31, 36 ] }, { "text":"textexample3", "indices":[ 37, 43 ] } ] } And lastly, here's what I currently have for the java class: protected Entities entities; @JsonIgnoreProperties(ignoreUnknown = true) protected class Entities { public Entities() {} protected Tags tags; @JsonIgnoreProperties(ignoreUnknown = true) protected class Tags { public Tags() {} protected String text; public String getText() { return text; } public void setText(String text) { this.text = text; } }; public Tags getTags() { return tags; } public void setTags(Tags tags) { this.tags = tags; } }; //Getters & Setters ... I've been able to translate the more simple objects into a POJO, but the list has me stumped. Any help is appreciated. Thanks!

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  • xmlEncoder not writing in netBeans

    - by Greg
    Hi, I am trying to use the xmlEncoder to write to xml file in net-beans but it doesnt work. Here is the call to the writing function: dbManipulator.writeStudents(deps); where deps = new Hashtable<String, Department>(); dbManipulator = new DataBaseManipulator(); Department is an class-object I made, and here is writeStudents method which is located in the DataBaseManipulator class: public void writeStudents(Hashtable<Integer, Student> students) { XMLEncoder encoder = null; try { encoder = new XMLEncoder(new FileOutputStream(".\\test\\Students.xml")); } catch(Exception e){} encoder.writeObject(students); encoder.close(); }//end of function writeStudents() Any ideas why it isnt working? I tried changing the hashtable to vector but still the xml file looks like that after the writing: <?xml version="1.0" encoding="UTF-8"?> <java version="1.6.0_18" class="java.beans.XMLDecoder"> <object class="java.util.Hashtable"/> </java> Thanks in advance, Greg

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  • C++ overide global operator comma gives error

    - by uray
    the second function gives error C2803 http://msdn.microsoft.com/en-us/library/zy7kx46x%28VS.80%29.aspx : 'operator ,' must have at least one formal parameter of class type. any clue? template<class T,class A = std::allocator<T>> class Sequence : public std::vector<T,A> { public: Sequence<T,A>& operator,(const T& a) { this->push_back(a); return *this; } Sequence<T,A>& operator,(const Sequence<T,A>& a) { for(Sequence<T,A>::size_type i=0 ; i<a.size() ; i++) { this->push_back(a.at(i)); } return *this; } }; //this works! template<typename T> Sequence<T> operator,(const T& a, const T&b) { Sequence<T> seq; seq.push_back(a); seq.push_back(b); return seq; } //this gives error C2803! Sequence<double> operator,(const double& a, const double& b) { Sequence<double> seq; seq.push_back(a); seq.push_back(b); return seq; }

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  • java.lang.ClassNotFoundException: org.springframework.ui.ModelMap

    - by aelshereay
    I create a simple webapp using tomcat 6, spring 2.5.6 and maven. The problem is when I boot up tomcat, I am getting the following errors: SEVERE: StandardWrapper.Throwable java.lang.NoClassDefFoundError: org/springframework/ui/ModelMap ... Caused by: java.lang.ClassNotFoundException: org.springframework.ui.ModelMap The ModelMap class does exist in spring-2.5.6.jar and spring-context-2.5.6.jar, I also have some other spring jars. All of them are being deployed to tomcat correctly, when I check the application WEB-INF (deployed to tomcat) I found all those jars there! I have only one @Controller that has a @RequestMapping("/home.htm") showForm(ModelMap model) method. My applicationContext is quite simple: <?xml version="1.0" encoding="utf-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:dwr="http://www.directwebremoting.org/schema/spring-dwr" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.directwebremoting.org/schema/spring-dwr http://www.directwebremoting.org/schema/spring-dwr-3.0.xsd" default-autowire="byName"> <context:component-scan base-package="org.myapp"/> <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/> <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property> <property name="prefix" value="/WEB-INF/view/"></property> <property name="suffix" value=".jsp"></property> </bean> </beans>

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  • How to create a fully lazy singleton for generics

    - by Brendan Vogt
    I have the following code implementation of my generic singleton provider: public sealed class Singleton<T> where T : class, new() { Singleton() { } public static T Instance { get { return SingletonCreator.instance; } } class SingletonCreator { static SingletonCreator() { } internal static readonly T instance = new T(); } } This sample was taken from 2 articles and I merged the code to get me what I wanted: http://www.yoda.arachsys.com/csharp/singleton.html and http://www.codeproject.com/Articles/11111/Generic-Singleton-Provider. This is how I tried to use the code above: public class MyClass { public static IMyInterface Initialize() { if (Singleton<IMyInterface>.Instance == null // Error 1 { Singleton<IMyInterface>.Instance = CreateEngineInstance(); // Error 2 Singleton<IMyInterface>.Instance.Initialize(); } return Singleton<IMyInterface>.Instance; } } And the interface: public interface IMyInterface { } The error at Error 1 is: 'MyProject.IMyInterace' must be a non-abstract type with a public parameterless constructor in order to use it as parameter 'T' in the generic type or method 'MyProject.Singleton<T>' The error at Error 2 is: Property or indexer 'MyProject.Singleton<MyProject.IMyInterface>.Instance' cannot be assigned to -- it is read only How can I fix this so that it is in line with the 2 articles mentioned above? Any other ideas or suggestions are appreciated.

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  • multi-threaded proxy checker having problems

    - by Paul
    hello everyone, I am trying to create a proxy checker. This is my first attempt at multithreading and it's not going so well, the threads seem to be waiting for one to complete before initializing the next. Imports System.Net Imports System.IO Imports System.Threading Public Class Form1 Public sFileName As String Public srFileReader As System.IO.StreamReader Public sInputLine As String Public Class WebCall Public proxy As String Public htmlout As String Public Sub New(ByVal proxy As String) Me.proxy = proxy End Sub Public Event ThreadComplete(ByVal htmlout As String) Public Sub send() Dim myWebRequest As HttpWebRequest = CType(WebRequest.Create("http://www.myserver.com/ip.php"), HttpWebRequest) myWebRequest.Proxy = New WebProxy(proxy, False) Try Dim myWebResponse As HttpWebResponse = CType(myWebRequest.GetResponse(), HttpWebResponse) Dim loResponseStream As StreamReader = New StreamReader(myWebResponse.GetResponseStream()) htmlout = loResponseStream.ReadToEnd() Debug.WriteLine("Finished - " & htmlout) RaiseEvent ThreadComplete(htmlout) Catch ex As WebException If (ex.Status = WebExceptionStatus.ConnectFailure) Then End If Debug.WriteLine("Failed - " & proxy) End Try End Sub End Class Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim proxy As String Dim webArray As New ArrayList() Dim n As Integer For n = 0 To 2 proxy = srFileReader.ReadLine() webArray.Add(New WebCall(proxy)) Next Dim w As WebCall For Each w In webArray Threading.ThreadPool.QueueUserWorkItem(New WaitCallback(AddressOf w.send), w) Next w End Sub Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load srFileReader = System.IO.File.OpenText("proxies.txt") End Sub End Class

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  • Switching from form_for to remote_form_for problems with submit changes in Rails

    - by Matthias Günther
    Hi there, another day with Rails and today I want to use Ajax. linkt_remote_link for changing a text was pretty easy so I thought it would also be easy to switch my form_for loop just to an ajax request form with remote_form_for, but the problem with the remote_form_for is that it doesn't save my changes? Here the code that worked: <% form_for bill, :url => {:action => 'update', :id => bill.id} do |f| %> # make the processing e.g. displaying texfields and so on <%= submit_tag 'speichern'%> It produces the following html code: <form action="/adminbill/update/58" class="edit_bill" id="edit_bill_58" method="post"><div style="margin:0;padding:0;display:inline"><input name="_method" type="hidden" value="put" /></div> <!-- here the html things for the forms --> <input class="button" name="commit" type="submit" value="speichern" /> Here the code which don't save me the changes and submit them: <% remote_form_for bill, :url => {:action => 'update', :id => bill.id} do |f| %> # make the processing e.g. displaying texfields and so on <%= submit_tag 'speichern'%> It produces the following html code: <form action="/adminbill/update/58" class="edit_bill" id="edit_bill_58" method="post" onsubmit="$.ajax({data:$.param($(this).serializeArray()), dataType:'script', type:'post', url:'/adminbill/update/58'}); return false;"><div style="margin:0;padding:0;display:inline"><input name="_method" type="hidden" value="put" /></div> <!-- here the html things for the forms --> <input class="button" name="commit" type="submit" value="speichern" /> I don't know if I have to consider something special when using remote_form_for (see remote_form_for)

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  • Why are my Fluent NHibernate SubClass Mappings generating redundant columns?

    - by Brook
    I'm using Fluent NHibernate 1.x build 694, built against NH 3.0 I have the following entities public abstract class Card { public virtual int Id { get; set; } public virtual string Name { get; set; } public virtual string Description { get; set; } public virtual Product Product { get; set; } public virtual Sprint Sprint { get; set; } } public class Story:Card { public virtual double Points { get; set; } public virtual int Priority { get; set; } public virtual IList<Task> Tasks { get; set; } } And the following mappings public class CardMap:ClassMap<Card> { public CardMap() { Id(c => c.Id) .Index("Card_Id"); Map(c => c.Name) .Length(50) .Not.Nullable(); Map(c => c.Description) .Length(1024) .Not.Nullable(); References(c=>c.Product) .Not.Nullable(); References(c=>c.Sprint) .Nullable(); } } public class StoryMap : SubclassMap<Story> { public StoryMap() { Map(s => s.Points); Map(s => s.Priority); HasMany(s => s.Tasks); } } When I generate my Schema, the tables are created as follows Card --------- Id Name Description Product_id Sprint_id Story ------------ Card_id Points Priority Product_id Sprint_id What I would have expected would have been to see the columns Product_id and Sprint_id ONLY in the Card table, not the Story table. What am I doing wrong or misunderstanding?

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  • Closing a hook that captures global input events

    - by Margus
    Intro Here is an example to illustrate the problem. Consider I am tracking and displaying mouse global current position and last click button and position to the user. Here is an image: To archive capturing click events on windows box, that would and will be sent to the other programs event messaging queue, I create a hook using winapi namely user32.dll library. This is outside JDK sandbox, so I use JNA to call the native library. This all works perfectly, but it does not close as I expect it to. My question is - How do I properly close following example program? Example source Code below is not fully written by Me, but taken from this question in Oracle forum and partly fixed. import java.awt.AWTException; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.GridLayout; import java.awt.MouseInfo; import java.awt.Point; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JFrame; import javax.swing.JLabel; import com.sun.jna.Native; import com.sun.jna.NativeLong; import com.sun.jna.Platform; import com.sun.jna.Structure; import com.sun.jna.platform.win32.BaseTSD.ULONG_PTR; import com.sun.jna.platform.win32.Kernel32; import com.sun.jna.platform.win32.User32; import com.sun.jna.platform.win32.WinDef.HWND; import com.sun.jna.platform.win32.WinDef.LRESULT; import com.sun.jna.platform.win32.WinDef.WPARAM; import com.sun.jna.platform.win32.WinUser.HHOOK; import com.sun.jna.platform.win32.WinUser.HOOKPROC; import com.sun.jna.platform.win32.WinUser.MSG; import com.sun.jna.platform.win32.WinUser.POINT; public class MouseExample { final JFrame jf; final JLabel jl1, jl2; final CWMouseHook mh; final Ticker jt; public class Ticker extends Thread { public boolean update = true; public void done() { update = false; } public void run() { try { Point p, l = MouseInfo.getPointerInfo().getLocation(); int i = 0; while (update == true) { try { p = MouseInfo.getPointerInfo().getLocation(); if (!p.equals(l)) { l = p; jl1.setText(new GlobalMouseClick(p.x, p.y) .toString()); } Thread.sleep(35); } catch (InterruptedException e) { e.printStackTrace(); return; } } } catch (Exception e) { update = false; } } } public MouseExample() throws AWTException, UnsupportedOperationException { this.jl1 = new JLabel("{}"); this.jl2 = new JLabel("{}"); this.jf = new JFrame(); this.jt = new Ticker(); this.jt.start(); this.mh = new CWMouseHook() { @Override public void globalClickEvent(GlobalMouseClick m) { jl2.setText(m.toString()); } }; mh.setMouseHook(); jf.setLayout(new GridLayout(2, 2)); jf.add(new JLabel("Position")); jf.add(jl1); jf.add(new JLabel("Last click")); jf.add(jl2); jf.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { mh.dispose(); jt.done(); jf.dispose(); } }); jf.setLocation(new Point(0, 0)); jf.setPreferredSize(new Dimension(200, 90)); jf.pack(); jf.setVisible(true); } public static class GlobalMouseClick { private char c; private int x, y; public GlobalMouseClick(char c, int x, int y) { super(); this.c = c; this.x = x; this.y = y; } public GlobalMouseClick(int x, int y) { super(); this.x = x; this.y = y; } public char getC() { return c; } public void setC(char c) { this.c = c; } public int getX() { return x; } public void setX(int x) { this.x = x; } public int getY() { return y; } public void setY(int y) { this.y = y; } @Override public String toString() { return (c != 0 ? c : "") + " [" + x + "," + y + "]"; } } public static class CWMouseHook { public User32 USER32INST; public CWMouseHook() throws UnsupportedOperationException { if (!Platform.isWindows()) { throw new UnsupportedOperationException( "Not supported on this platform."); } USER32INST = User32.INSTANCE; mouseHook = hookTheMouse(); Native.setProtected(true); } private static LowLevelMouseProc mouseHook; private HHOOK hhk; private boolean isHooked = false; public static final int WM_LBUTTONDOWN = 513; public static final int WM_LBUTTONUP = 514; public static final int WM_RBUTTONDOWN = 516; public static final int WM_RBUTTONUP = 517; public static final int WM_MBUTTONDOWN = 519; public static final int WM_MBUTTONUP = 520; public void dispose() { unsetMouseHook(); mousehook_thread = null; mouseHook = null; hhk = null; USER32INST = null; } public void unsetMouseHook() { isHooked = false; USER32INST.UnhookWindowsHookEx(hhk); System.out.println("Mouse hook is unset."); } public boolean isIsHooked() { return isHooked; } public void globalClickEvent(GlobalMouseClick m) { System.out.println(m); } private Thread mousehook_thread; public void setMouseHook() { mousehook_thread = new Thread(new Runnable() { @Override public void run() { try { if (!isHooked) { hhk = USER32INST.SetWindowsHookEx(14, mouseHook, Kernel32.INSTANCE.GetModuleHandle(null), 0); isHooked = true; System.out .println("Mouse hook is set. Click anywhere."); // message dispatch loop (message pump) MSG msg = new MSG(); while ((USER32INST.GetMessage(msg, null, 0, 0)) != 0) { USER32INST.TranslateMessage(msg); USER32INST.DispatchMessage(msg); if (!isHooked) break; } } else System.out .println("The Hook is already installed."); } catch (Exception e) { System.err.println("Caught exception in MouseHook!"); } } }); mousehook_thread.start(); } private interface LowLevelMouseProc extends HOOKPROC { LRESULT callback(int nCode, WPARAM wParam, MOUSEHOOKSTRUCT lParam); } private LowLevelMouseProc hookTheMouse() { return new LowLevelMouseProc() { @Override public LRESULT callback(int nCode, WPARAM wParam, MOUSEHOOKSTRUCT info) { if (nCode >= 0) { switch (wParam.intValue()) { case CWMouseHook.WM_LBUTTONDOWN: globalClickEvent(new GlobalMouseClick('L', info.pt.x, info.pt.y)); break; case CWMouseHook.WM_RBUTTONDOWN: globalClickEvent(new GlobalMouseClick('R', info.pt.x, info.pt.y)); break; case CWMouseHook.WM_MBUTTONDOWN: globalClickEvent(new GlobalMouseClick('M', info.pt.x, info.pt.y)); break; default: break; } } return USER32INST.CallNextHookEx(hhk, nCode, wParam, info.getPointer()); } }; } public class Point extends Structure { public class ByReference extends Point implements Structure.ByReference { }; public NativeLong x; public NativeLong y; } public static class MOUSEHOOKSTRUCT extends Structure { public static class ByReference extends MOUSEHOOKSTRUCT implements Structure.ByReference { }; public POINT pt; public HWND hwnd; public int wHitTestCode; public ULONG_PTR dwExtraInfo; } } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { new MouseExample(); } catch (AWTException e) { e.printStackTrace(); } } }); } }

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  • Why is there no autorelease pool when I do performSelectorInBackground: ?

    - by Thanks
    I am calling a method that goes in a background thread: [self performSelectorInBackground:@selector(loadViewControllerWithIndex:) withObject:[NSNumber numberWithInt:viewControllerIndex]]; then, I have this method implementation that gets called by the selector: - (void) loadViewControllerWithIndex:(NSNumber *)indexNumberObj { NSAutoreleasePool *arPool = [[NSAutoreleasePool alloc] init]; NSInteger vcIndex = [indexNumberObj intValue]; Class c; UIViewController *controller = [viewControllers objectAtIndex:vcIndex]; switch (vcIndex) { case 0: c = [MyFirstViewController class]; break; case 1: c = [MySecondViewController class]; break; default: NSLog(@"unknown index for loading view controller: %d", vcIndex); // error break; } if ((NSNull *)controller == [NSNull null]) { controller = [[c alloc] initWithNib]; [viewControllers replaceObjectAtIndex:vcIndex withObject:controller]; [controller release]; } if (controller.view.superview == nil) { UIView *placeholderView = [viewControllerPlaceholderViews objectAtIndex:vcIndex]; [placeholderView addSubview:controller.view]; } [arPool release]; } Althoug I do create an autorelease pool there for that thread, I always get this error: 2009-05-30 12:03:09.910 Demo[1827:3f03] *** _NSAutoreleaseNoPool(): Object 0x523e50 of class NSCFNumber autoreleased with no pool in place - just leaking Stack: (0x95c83f0f 0x95b90442 0x28d3 0x2d42 0x95b96e0d 0x95b969b4 0x93a00155 0x93a00012) If I take away the autorelease pool, I get a whole bunch of messages like these. I also tried to create an autorelease pool around the call of the performSelectorInBackground:, but that doesn't help. I suspect the parameter, but I don't know why the compiler complains about an NSCFNumber. Am I missing something? My Instance variables are all "nonatomic". Can that be a problem? UPDATE: I may also suspect that some variable has been added to an autorelease pool of the main thread (maybe an ivar), and now it trys to release that one inside the wrong autorelease pool? If so, how could I fix that? (damn, this threading stuff is complex ;) )

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