I am new to Vertx.
I am playing with the API and I am trying to write a FileSizeHandler. I don't know if it is the correct way to do it but I would like to have your opinions.
In my code I would like to use the handler like this :
public class MyVerticle extends AbstractVerticle {
#Override
public void start() throws Exception {
getFileSize("./my_file.txt", event -> {
if(event.succeeded()){
Long result = event.result();
System.out.println("FileSize is " + result);
} else {
System.out.println(event.cause().getLocalizedMessage());
}
});
}
private void getFileSize(String filepath, Handler<AsyncResult<Long>> resultHandler){
resultHandler.handle(new FileSizeHandler(filepath));
}
}
Here is my FileSizeHandler class :
public class FileSizeHandler implements AsyncResult<Long> {
private boolean isSuccess;
private Throwable cause;
private Long result;
public FileSizeHandler(String filePath){
cause = null;
isSuccess = false;
result = 0L;
try {
result = Files.size(Paths.get(filePath));
isSuccess = !isSuccess;
} catch (IOException e) {
cause = e;
}
}
#Override
public Long result() {
return result;
}
#Override
public Throwable cause() {
return cause;
}
#Override
public boolean succeeded() {
return isSuccess;
}
#Override
public boolean failed() {
return !isSuccess;
}
}
What bothers me in the handler, is that I have to do it in the constructor of the class. Is there a better way to do it?
First of all, you called your class FileHandler, but it's not. It's a result.
You declare handler in Vert.x like that:
public class MyHandler implements Handler<AsyncResult<Long>> {
#Override
public void handle(AsyncResult<Long> event) {
// Do some async code here
}
}
Now, for what you do, there's vertx.fileSystem():
public class MyVerticle extends AbstractVerticle {
#Override
public void start() throws Exception {
vertx.fileSystem().readFile("./my_file.txt", (f) -> {
if (f.succeeded()) {
System.out.println(f.result().length());
}
else {
f.cause().printStackTrace();
}
});
}
}
I have the following two Java classes (Command and Player). I would like to be able to list from the Command class all the public methods from the Player class, without having to hard-code them. I tried several ways, including an interface, or the command pattern, but I am not fluent in Java and I did not manage to make them work.
It seems to me that using Java's reflection API would be easier. However, when I use it to print the public methods from the Player class, I get extraneous methods, which I assume were inherited from the Object class.
Is there a way to only include those methods I defined myself (i.e. those starting with "public method: public void Player.")?
Thank you,
LC
Here is the output I get:
public method: public void Player.search(Command)
public method: public Room Player.getCurrentRoom()
public method: public void Player.engage()
public method: public void Player.trade(Command)
public method: public void Player.goRoom(Command)
public method: public void Player.takeItem(Command)
public method: public void Player.dropItem(Command)
public method: public void Player.lock(Command)
public method: public void Player.unlock(Command)
public method: public final void java.lang.Object.wait(long,int) throws java.lang.InterruptedException
public method: public final native void java.lang.Object.wait(long) throws java.lang.InterruptedException
public method: public final void java.lang.Object.wait() throws java.lang.InterruptedException
public method: public boolean java.lang.Object.equals(java.lang.Object)
public method: public java.lang.String java.lang.Object.toString()
public method: public native int java.lang.Object.hashCode()
public method: public final native java.lang.Class java.lang.Object.getClass()
public method: public final native void java.lang.Object.notify()
public method: public final native void java.lang.Object.notifyAll()
Here is the Command class:
import java.lang.reflect.Method;
public class Command
{
// a constant array that holds all valid command words
private static String[] validCommands;
private String commandWord;
private String secondWord;
public Command(String firstWord, String secondWord)
{
commandWord = firstWord;
this.secondWord = secondWord;
}
[...] //some code omitted
public boolean process(Player player)
{
Class pClass = player.getClass();
Method[] methods = pClass.getMethods();
for (int i = 0; i < methods.length; i++) {
System.out.println("public method: " + methods[i]);
}
boolean wantToQuit = false;
if(commandWord == null) {
System.out.println("I don't know what you mean...");
return false;
}
if (commandWord.equals("help")) {
printHelp();
}
else if (commandWord.equals("go")) {
player.goRoom(this);
}
else if (commandWord.equals("quit")) {
wantToQuit = quit();
}
else if (commandWord.equals("take")) {
player.takeItem(this);
}
else if (commandWord.equals("drop")) {
player.dropItem(this);
}
else if (commandWord.equals("search")) {
player.search(this);
}
else if (commandWord.equals("engage")) {
player.engage();
}
else if (commandWord.equals("trade")) {
player.trade(this);
}
else if (commandWord.equals("lock")) {
player.lock(this);
}
else if (commandWord.equals("unlock")) {
player.unlock(this);
}
else {
System.out.println("Invalid command. Type 'help' if you forgot the list of available commands.");
}
// else command not recognised.
return wantToQuit;
}
}
Here is the outline of the Player class:
public class Player
{
private String name;
private Room currentRoom;
private ArrayList<Item> items;
Player (String name, Room startingRoom)
{
this.name = name;
items = new ArrayList<Item>();
this.currentRoom = startingRoom;
printWelcome();
}
public void engage()
{
[...]
}
public void trade(Command command)
{
[...] }
public void goRoom(Command command)
{
[...] }
public void search(Command command)
{
[...] }
public void takeItem(Command command)
{
[...] }
public void dropItem(Command command)
{
[...] }
public void lock(Command command)
{
[...] }
public void unlock(Command command)
{
[...]
}
}
You want to use the getDeclaredMethods() class from the Java reflection API.
http://docs.oracle.com/javase/7/docs/api/java/lang/Class.html#getDeclaredMethods()
That gives you only the methods declared on the class in question, ignoring superclasses and interfaces.
I have this Exception:
public class ErrorException extends Exception
{
private static final long serialVersionUID = 1L;
private String errorMessage = "";
private int errorCode = 0;
private String errorLevel = "";
private Window errorSource = null;
public String getErrorMessage()
{
return errorMessage;
}
public int getErrorCode()
{
return errorCode;
}
public String getErrorLevel()
{
return errorLevel;
}
public Window getErrorSource()
{
return errorSource;
}
public ErrorException(String message, int code, int level, Window source)
{
super();
errorMessage = message;
errorCode = code;
switch (level)
{
case 0:
{
errorLevel = "benignError";
}
case 1:
{
errorLevel = "criticalError";
}
case 2:
{
errorLevel = "terminalError";
}
}
errorSource = source;
}
}
And I have this method:
public static Element check(final Document document) throws ErrorException
{
try
{
chapter.resetLatch();
final SecondaryLoop loop = Toolkit.getDefaultToolkit().getSystemEventQueue().createSecondaryLoop();
new Thread()
{
#Override
public void run()
{
SwingUtilities.invokeLater(new Runnable()
{
#Override
public void run()
{
answer.getPreviousElement().takeFocus();
question.removeAnswer(answer);
question.rewriteLetters();
Utils.update(chapter);
loop.exit();
}
});
}
}.start();
loop.enter();
chapter.getLatch().await();
}
catch (InterruptedException e)
{
throw new ErrorException("blankElementDialogError", 8, 1, Main.getGui().getMasterWindow());
}
return new Element();
}
And I use it in this constructor code:
public ConfirmCloseDialog(final Document document, final int postOperation)
{
final CustomJButton doSave = new CustomJButton(Main.getString("doSave"), false);
doSave.addActionListener(new ActionListener()
{
#Override
public void actionPerformed(ActionEvent arg0)
{
getConfirmCloseDialog().dispose();
new Thread()
{
#Override
public void run()
{
/*this method is the one above -->*/Element problem = BlankElementDialog.check(document);
if (problem == null)
{
new SaveChooser(document, postOperation);
}
else
{
new BlankElementDialog(problem);
}
}
}.start();
}
});
}
The code for the second part is not full, but there are no special constructs in the rest of the code (just some GUi objects being constructed and there is no try catch anywhere in the constructor).
However, Eclipse isn't forcing me to encapsulate the method call into try catch block, despite the fact that the method throws an Exception (ErorrException subclasses Exception).
And I know that Exception is checked exception, so it should force it, right?
Why?
What do I have to do so it would force it?
Even without any details Eclipse should notify, look at this:
Just restart the Eclipse should solve the issue.
public class TestClass {
public static void main(String[] args) {
method(2);//Notification here!
}
static void method(int a) throws myException {
}
}
class myException extends Exception {
}
I am getting an error for the following code in a java web app--
XStream xstream = new XStream();
apiresponse myClassObject;
myClassObject= xstream.fromXML(resp);
The error is shown for the line of code just above this line--
error="Type mismatch- cannot convert from Object to apiresponse"
Given below is the XML that I have to parse---
<apiresponse version="1" xmlns="http://ahrefs.com/schemas/api/links/1">
<resultset_links count="2">
<result>
<source_url>http://ahrefs.com/robot/</source_url>
<destination_url>http://blog.ahrefs.com/</destination_url>
<source_ip>50.22.24.236</source_ip>
<source_title>Ahrefs – backlinks research tool</source_title>
<visited>2011-08-31T07:56:53Z</visited>
<anchor>Blog</anchor>
<rating>257.674000</rating>
<link_type>text</link_type>
<is_nofollow>false</is_nofollow>
</result>
<result>
<source_url>http://apps.vc/</source_url>
<destination_url>http://ahrefs.com/robot/</destination_url>
<source_ip>64.20.55.86</source_ip>
<source_title>Device info</source_title>
<visited>2011-08-27T18:59:31Z</visited>
<anchor>http://ahrefs.com/robot/</anchor>
<rating>209.787100</rating>
<link_type>text</link_type>
<is_nofollow>false</is_nofollow>
</result>
</resultset_links>
</apiresponse>
I have created the following java classes to obtain data from above xml---
package com.arvindikchari.linkdatasmith.domain;
final public class apiresponse {
protected resultset_links rlinks;
public apiresponse() {
}
public resultset_links getRlinks()
{
return rlinks;
}
public setRlinks(resultset_links rlinks)
{
this.rlinks=rlinks;
}
}
final public class resultset_links {
protected List<result> indiv_result = new ArrayList<result>();
public resultset_links() {
}
public List<result> getIndiv_result()
{
return List;
}
public void setIndiv_result(List<result> indiv_result)
{
this.indiv_result=indiv_result;
}
}
final public class result {
protected String source_url;
protected String destination_url;
protected String source_ip;
protected String source_title;
protected String visited;
protected String anchor;
protected String rating;
protected String link_type;
public result() {
}
public String getSource_url()
{
return source_url;
}
public void setSource_url(String source_url)
{
this.source_url=source_url;
}
public String getDestination_url()
{
return destination_url;
}
public void setDestination_url(String destination_url)
{
this.destination_url=destination_url;
}
public String getSource_ip()
{
return source_ip;
}
public void setSource_ip(String source_ip)
{
this.source_ip=source_ip;
}
public String getSource_title()
{
return source_title;
}
public void setSource_title(String source_title)
{
this.source_title=source_title;
}
public String getVisited()
{
return visited;
}
public void setVisited(String visited)
{
this.visited=visited;
}
public String getAnchor()
{
return anchor;
}
public void setAnchor(String anchor)
{
this.anchor=anchor;
}
public String getRating()
{
return rating;
}
public void setRating(String rating)
{
this.rating=rating;
}
public String getLink_type()
{
return link_type;
}
public void setLink_type(String link_type)
{
this.link_type=link_type;
}
}
What am I doing wrong here?
You have many errors, but the one corresponding to your message is you have to cast the result of xstream.fromXML to an apiresponse' object :
apiresponse result = (apiresponse)xstream.fromXML(resp);
Moreover, the code you provided (the Java classes) do not compile, there are many errors.
Here are some improvements :
Result.java :
#XStreamAlias("result")
public class Result {
protected String source_url;
protected String destination_url;
protected String source_ip;
protected String source_title;
protected String visited;
protected String anchor;
protected String rating;
protected String link_type;
protected Boolean is_nofollow;
public Result() {
}
public String getSource_url()
{
return source_url;
}
public void setSource_url(String source_url)
{
this.source_url=source_url;
}
public String getDestination_url()
{
return destination_url;
}
public void setDestination_url(String destination_url)
{
this.destination_url=destination_url;
}
public String getSource_ip()
{
return source_ip;
}
public void setSource_ip(String source_ip)
{
this.source_ip=source_ip;
}
public String getSource_title()
{
return source_title;
}
public void setSource_title(String source_title)
{
this.source_title=source_title;
}
public String getVisited()
{
return visited;
}
public void setVisited(String visited)
{
this.visited=visited;
}
public String getAnchor()
{
return anchor;
}
public void setAnchor(String anchor)
{
this.anchor=anchor;
}
public String getRating()
{
return rating;
}
public void setRating(String rating)
{
this.rating=rating;
}
public String getLink_type()
{
return link_type;
}
public void setLink_type(String link_type)
{
this.link_type=link_type;
}
public Boolean getIs_nofollow() {
return is_nofollow;
}
public void setIs_nofollow(Boolean is_nofollow) {
this.is_nofollow = is_nofollow;
}
ResultsetLinks.java :
#XStreamAlias("resultset_links")
public class ResultsetLinks {
#XStreamImplicit(itemFieldName="result")
protected List<Result> indivResult = new ArrayList<Result>();
public ResultsetLinks() {
}
public List<Result> getResult()
{
return indivResult;
}
public void setResult(List<Result> indiv_result)
{
this.indivResult =indiv_result;
}
}
ApiResponse.java :
#XStreamAlias("apiresponse")
public class ApiResponse {
#XStreamAlias("resultset_links")
protected ResultsetLinks rlinks;
public ApiResponse() {
}
public ResultsetLinks getRlinks()
{
return rlinks;
}
public void setRlinks(ResultsetLinks rlinks)
{
this.rlinks=rlinks;
}
}
And finally your code to unmarshall the XML :
XStream xstream = new XStream();
xstream.processAnnotations(ApiResponse.class);
xstream.processAnnotations(ResultsetLinks.class);
xstream.processAnnotations(Result.class);
ApiResponse result = (ApiResponse)xstream.fromXML(resp);
All this code is working fine with Xstream 1.4.2
Try to follow Sun's coding convention for your classes name, attributes names, etc...
Use XstreamAliases to adapt the Java class name to the XML name.
I want to make a unit test suite of the same object with same variable but different values. However if the object get the same name (created by this.setName("testlaunch"); (we must have the name of a method tested by JUnit), it runs only one test.
If i don't write this.setName("testlaunch"); it complains saying junit.framework.AssertionFailedError: TestCase.fName cannot be null.
I don't know what to do...
public class LanceurRegleGestion extends TestSuite
{
public static Test suite()
{
Class maClasse = null;
TestSuite suite = new TestSuite();
String filtre = ".*.xml";
// on compile le pattern pour l'expression réguliere
Pattern p = Pattern.compile(filtre);
String path = "D:/Documents/workspace/Solipsisme/src/ReglesGestion/XML/";
// on liste les fichiers du repertoire
String [] u = new File(path).list();
// on parcours la liste de fichier
System.out.println("Initialisation");
for (int i=0; i
et le code de l'objet serialisé
public class Application extends TestCase {
private String nomappli;
private String id2_1;
private String id3_1;
private String id4_1;
private String id2_2;
private String id3_2;
private String id4_2;
private String id5_2;
private String id6_2;
private String id7_2;
private String id8_2;
private String id9_2;
private String id2_3;
private String id3_3;
private String id4_3;
private String id2_4;
private String id3_4;
private String id4_4;
private String id2_5;
private String id3_5;
private String id4_5;
private String id5_5;
private String id6_5;
private String id7_5;
private static Selenium selenium;
public Application(String nomappli,String id2_1,String id3_1,String id4_1,String id2_2,String id3_2,String id4_2,String id5_2,String id6_2,String id7_2,String id8_2,String id9_2,String id2_3,String id3_3,String id4_3,String id2_4,String id3_4,String id4_4,String id2_5, String id3_5,String id4_5,String id5_5,String id6_5,String id7_5)
{
this.setName("testlaunch");
this.nomappli = nomappli;
this.id2_1 = id2_1;
this.id3_1 = id3_1;
this.id4_1 = id4_1;
this.id2_2 = id2_2;
this.id3_2 = id3_2;
this.id4_2 = id4_2;
this.id5_2 = id5_2;
this.id6_2 = id6_2;
this.id7_2 = id7_2;
this.id8_2 = id8_2;
this.id9_2 = id9_2;
this.id2_3 = id2_3;
this.id3_3 = id3_3;
this.id4_3 = id4_3;
this.id2_4 = id2_4;
this.id3_4 = id3_4;
this.id4_4 = id4_4;
this.id2_5 = id2_5;
this.id3_5 = id3_5;
this.id4_5 = id4_5;
this.id5_5 = id5_5;
this.id6_5 = id6_5;
this.id7_5 = id7_5;
}
public Application(){
}
public String toString()
{
return getNomappli();
}
public void setNomappli(String nomappli)
{
this.nomappli = nomappli;
}
public String getNomappli()
{
return this.nomappli;
}
public void setId2_1(String id2_1)
{
this.id2_1 = id2_1;
}
public String getId2_1()
{
return this.id2_1;
}
public void setId3_1(String id3_1)
{
this.id3_1 = id3_1;
}
public String getId3_1()
{
return this.id3_1;
}
public void setId4_1(String id4_1)
{
this.id4_1 = id4_1;
}
public String getId4_1()
{
return this.id4_1;
}
public void setId2_2(String id2_2)
{
this.id2_2 = id2_2;
}
public String getId2_2()
{
return this.id2_2;
}
public void setId3_2(String id3_2)
{
this.id3_2 = id3_2;
}
public String getId3_2()
{
return this.id3_2;
}
public void setId4_2(String id4_2)
{
this.id4_2 = id4_2;
}
public String getId4_2()
{
return this.id4_2;
}
public void setId5_2(String id5_2)
{
this.id5_2 = id5_2;
}
public String getId5_2()
{
return this.id5_2;
}
public void setId6_2(String id6_2)
{
this.id6_2 = id6_2;
}
public String getId6_2()
{
return this.id6_2;
}
public void setId7_2(String id7_2)
{
this.id7_2 = id7_2;
}
public String getId7_2()
{
return this.id7_2;
}
public void setId8_2(String id8_2)
{
this.id8_2 = id8_2;
}
public String getId8_2()
{
return this.id8_2;
}
public void setId9_2(String id9_2)
{
this.id9_2 = id9_2;
}
public String getId9_2()
{
return this.id9_2;
}
public void setId2_3(String id2_3)
{
this.id2_3 = id2_3;
}
public String getId2_3()
{
return this.id2_3;
}
public void setId3_3(String id3_3)
{
this.id3_3 = id3_3;
}
public String getId3_3()
{
return this.id3_3;
}
public void setId4_3(String id4_3)
{
this.id4_3 = id4_3;
}
public String getId4_3()
{
return this.id4_3;
}
public void setId2_4(String id2_4)
{
this.id2_4 = id2_4;
}
public String getId2_4()
{
return this.id2_4;
}
public void setId3_4(String id3_4)
{
this.id3_4 = id3_4;
}
public String getId3_4()
{
return this.id3_4;
}
public void setId4_4(String id4_4)
{
this.id4_4 = id4_4;
}
public String getId4_4()
{
return this.id4_4;
}
public void setId2_5(String id2_5)
{
this.id2_5 = id2_5;
}
public String getId2_5()
{
return this.id2_5;
}
public void setId3_5( String id3_5)
{
this.id3_5 = id3_5;
}
public String getId3_5()
{
return this.id3_5;
}
public void setId4_5(String id4_5)
{
this.id4_5 = id4_5;
}
public String getId4_5()
{
return this.id4_5;
}
public void setId5_5(String id5_5)
{
this.id5_5 = id5_5;
}
public String getId5_5()
{
return this.id5_5;
}
public void setId6_5(String id6_5)
{
this.id6_5 = id6_5;
}
public String getId6_5()
{
return this.id6_5;
}
public void setId7_5(String id7_5)
{
this.id7_5 = id7_5;
}
public String getId7_5()
{
return this.id7_5;
}
public void setSelenium(Selenium selenium)
{
this.selenium = selenium;
}
public Selenium getSelenium()
{
return this.selenium;
}
public final static void login()
{
selenium.open("apj/ident");
selenium.type("username", "hsuzumiya-cp");
selenium.type("password", "1");
selenium.click("enterButton");
selenium.waitForPageToLoad("9999999");
}
public void testlaunch()
{
generique(this.nomappli,this.id2_1,this.id3_1,this.id4_1,this.id2_2,this.id3_2,this.id4_2,this.id5_2,this.id6_2,this.id7_2,this.id8_2,this.id9_2,this.id2_3,this.id3_3,this.id4_3,this.id2_4,this.id3_4,this.id4_4,this.id2_5,this.id3_5,this.id4_5,this.id5_5,this.id6_5,this.id7_5);
}
public void setUp() throws Exception
{
System.out.println("Initialisation");
selenium = new DefaultSelenium("127.0.0.1",4444,"*iexplore", "http://hsuzumiya/");
selenium.start();
selenium.setTimeout("90000");
selenium.setSpeed("500");
login();
}
public void generique(String nomappli,String id2_1,String id3_1,String id4_1,String id2_2,String id3_2,String id4_2,
String id5_2,String id6_2,String id7_2,String id8_2,String id9_2,String id2_3,String id3_3,String id4_3,String id2_4,
String id3_4,String id4_4,String id2_5, String id3_5,String id4_5,String id5_5,String id6_5,String id7_5
)
{
System.out.println(nomappli);
selenium.click("valider");
selenium.waitForPageToLoad("30000");
selenium.click("validertout");
}
public final void tearDown() throws Exception
{
System.out.println("Killing session");
selenium.stop();
}
}
Being new to junit, I stumbled upon this question hoping to solve a problem I had getting the same message. Through further research, I found that it is necessary to pass the name of the test function you want to invoke through addTest to the constructor of the test case class. A simple (and useless, other than illustration) example follows:
JunitTestCases.java
import junit.framework.TestCase;
public class JunitTestCases extends TestCase {
public JunitTestCases(String fnName) {
super(fnName);
}
public void testA() {
assertTrue("assertTrue failed", true);
}
}
JunitTestSuite.java:
import junit.framework.*;
public class JunitTestSuite {
public static Test suite() {
TestSuite suite = new TestSuite();
suite.addTest(new JunitTestCases("testA"));
return suite;
}
public static void main(String[] args) {
junit.textui.TestRunner.run(suite());
}
}
When I compiled with:
javac -cp .:path/to/junit-X.X.X.jar JunitTestSuite.java
and ran with
java -cp .:path/to/junit-X.X.X.jar JunitTestSuite
this worked with no errors, with junit giving me an OK message.