Cleanup & automatic refresh

.gitignore

@@ -1,5 +1,6 @@
 /test-classes/
 /gwt-unitCache/
 /war/fotostream/
+/war/img/
 /war/WEB-INF/deploy/
 .gwt-log

src/net/molez/mandlm/fotostream/client/FotoStream.java

@@ -1,51 +1,20 @@
 package net.molez.mandlm.fotostream.client;
 
-import net.molez.mandlm.fotostream.shared.FieldVerifier;
 import com.google.gwt.core.client.EntryPoint;
 import com.google.gwt.core.client.GWT;
-import com.google.gwt.event.dom.client.ClickEvent;
-import com.google.gwt.event.dom.client.ClickHandler;
-import com.google.gwt.event.dom.client.KeyCodes;
-import com.google.gwt.event.dom.client.KeyUpEvent;
-import com.google.gwt.event.dom.client.KeyUpHandler;
 import com.google.gwt.event.dom.client.LoadEvent;
 import com.google.gwt.event.dom.client.LoadHandler;
+import com.google.gwt.user.client.Timer;
 import com.google.gwt.user.client.rpc.AsyncCallback;
-import com.google.gwt.user.client.ui.Button;
 import com.google.gwt.user.client.ui.DialogBox;
-import com.google.gwt.user.client.ui.HTML;
 import com.google.gwt.user.client.ui.Image;
-import com.google.gwt.user.client.ui.Label;
 import com.google.gwt.user.client.ui.RootPanel;
-import com.google.gwt.user.client.ui.TextBox;
-import com.google.gwt.user.client.ui.VerticalPanel;
 
-/**
- * Entry point classes define <code>onModuleLoad()</code>.
- */
-public class FotoStream implements EntryPoint {
-	/**
-	 * The message displayed to the user when the server cannot be reached or
-	 * returns an error.
-	 */
-	private static final String SERVER_ERROR = "An error occurred while "
-			+ "attempting to contact the server. Please check your network " + "connection and try again.";
-
-	/**
-	 * Create a remote service proxy to talk to the server-side Greeting service.
-	 */
-	private final GreetingServiceAsync greetingService = GWT.create(GreetingService.class);
+public class FotoStream implements EntryPoint 
+{
 	private final CurrentImageURLServiceAsync imageURLService = GWT.create(CurrentImageURLService.class);
 
-	/**
-	 * This is the entry point method.
-	 */
 	public void onModuleLoad() {
-		final Button sendButton = new Button("Send");
-		final TextBox nameField = new TextBox();
-		nameField.setText("GWT User");
-		final Label errorLabel = new Label();
-		
 		final Image image = new Image();
 		image.setVisible(false);
 		image.addLoadHandler(new LoadHandler() 
@@ -58,125 +27,37 @@ public class FotoStream implements EntryPoint {
 			}
 		});
 		
-		imageURLService.getCurrentImageURL(new AsyncCallback<String>()
+		Timer imageReloadTimer = new Timer()
 		{
 			@Override
-			public void onFailure(Throwable caught) 
+			public void run() 
 			{
-				DialogBox errorMsg = new DialogBox();
-				
-				errorMsg.setTitle("Error loading current immage");
-				errorMsg.setHTML(caught.getMessage());
-				errorMsg.show();
-			}
-
-			@Override
-			public void onSuccess(String result) 
-			{
-				image.setUrl(result);
-			}			
-		});
-
-		// We can add style names to widgets
-		sendButton.addStyleName("sendButton");		
-
-		// Add the nameField and sendButton to the RootPanel
-		// Use RootPanel.get() to get the entire body element
-		RootPanel.get("nameFieldContainer").add(nameField);
-		RootPanel.get("sendButtonContainer").add(sendButton);
-		RootPanel.get("errorLabelContainer").add(errorLabel);
-		RootPanel.get("imageContainer").add(image);
-
-		// Focus the cursor on the name field when the app loads
-		nameField.setFocus(true);
-		nameField.selectAll();
-
-		// Create the popup dialog box
-		final DialogBox dialogBox = new DialogBox();
-		dialogBox.setText("Remote Procedure Call");
-		dialogBox.setAnimationEnabled(true);
-		final Button closeButton = new Button("Close");
-		// We can set the id of a widget by accessing its Element
-		closeButton.getElement().setId("closeButton");
-		final Label textToServerLabel = new Label();
-		final HTML serverResponseLabel = new HTML();
-		VerticalPanel dialogVPanel = new VerticalPanel();
-		dialogVPanel.addStyleName("dialogVPanel");
-		dialogVPanel.add(new HTML("<b>Sending name to the server:</b>"));
-		dialogVPanel.add(textToServerLabel);
-		dialogVPanel.add(new HTML("<br><b>Server replies:</b>"));
-		dialogVPanel.add(serverResponseLabel);
-		dialogVPanel.setHorizontalAlignment(VerticalPanel.ALIGN_RIGHT);
-		dialogVPanel.add(closeButton);
-		dialogBox.setWidget(dialogVPanel);
-
-		// Add a handler to close the DialogBox
-		closeButton.addClickHandler(new ClickHandler() {
-			public void onClick(ClickEvent event) {
-				dialogBox.hide();
-				sendButton.setEnabled(true);
-				sendButton.setFocus(true);
-			}
-		});
-
-		// Create a handler for the sendButton and nameField
-		class MyHandler implements ClickHandler, KeyUpHandler {
-			/**
-			 * Fired when the user clicks on the sendButton.
-			 */
-			public void onClick(ClickEvent event) {
-				sendNameToServer();
-			}
-
-			/**
-			 * Fired when the user types in the nameField.
-			 */
-			public void onKeyUp(KeyUpEvent event) {
-				if (event.getNativeKeyCode() == KeyCodes.KEY_ENTER) {
-					sendNameToServer();
-				}
-			}
-
-			/**
-			 * Send the name from the nameField to the server and wait for a response.
-			 */
-			private void sendNameToServer() {
-				// First, we validate the input.
-				errorLabel.setText("");
-				String textToServer = nameField.getText();
-				if (!FieldVerifier.isValidName(textToServer)) {
-					errorLabel.setText("Please enter at least four characters");
-					return;
-				}
-
-				// Then, we send the input to the server.
-				sendButton.setEnabled(false);
-				textToServerLabel.setText(textToServer);
-				serverResponseLabel.setText("");
-				greetingService.greetServer(textToServer, new AsyncCallback<String>() {
-					public void onFailure(Throwable caught) {
-						// Show the RPC error message to the user
-						dialogBox.setText("Remote Procedure Call - Failure");
-						serverResponseLabel.addStyleName("serverResponseLabelError");
-						serverResponseLabel.setHTML(SERVER_ERROR);
-						dialogBox.center();
-						closeButton.setFocus(true);
+				imageURLService.getCurrentImageURL(new AsyncCallback<String>()
+				{
+					@Override
+					public void onFailure(Throwable caught) 
+					{
+						DialogBox errorMsg = new DialogBox();
+						
+						errorMsg.setTitle("Error loading image");
+						errorMsg.setHTML(caught.getMessage());
+						errorMsg.show();
 					}
 
-					public void onSuccess(String result) {
-						dialogBox.setText("Remote Procedure Call");
-						serverResponseLabel.removeStyleName("serverResponseLabelError");
-						serverResponseLabel.setHTML(result);
-						dialogBox.center();
-						closeButton.setFocus(true);
-					}
+					@Override
+					public void onSuccess(String result) 
+					{
+						if (result != image.getUrl())
+						{
+							image.setUrl(result);
+						}
+					}			
 				});
-			}
-		}
-
-		// Add a handler to send the name to the server
-		MyHandler handler = new MyHandler();
-		sendButton.addClickHandler(handler);
-		nameField.addKeyUpHandler(handler);
+			}	
+		};
+		
+		imageReloadTimer.scheduleRepeating(2000);
+		
+		RootPanel.get("imageContainer").add(image);
 	}
 }

src/net/molez/mandlm/fotostream/client/GreetingService.java

@@ -1,12 +0,0 @@
-package net.molez.mandlm.fotostream.client;
-
-import com.google.gwt.user.client.rpc.RemoteService;
-import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;
-
-/**
- * The client-side stub for the RPC service.
- */
-@RemoteServiceRelativePath("greet")
-public interface GreetingService extends RemoteService {
-	String greetServer(String name) throws IllegalArgumentException;
-}

src/net/molez/mandlm/fotostream/client/GreetingServiceAsync.java

@@ -1,10 +0,0 @@
-package net.molez.mandlm.fotostream.client;
-
-import com.google.gwt.user.client.rpc.AsyncCallback;
-
-/**
- * The async counterpart of <code>GreetingService</code>.
- */
-public interface GreetingServiceAsync {
-	void greetServer(String input, AsyncCallback<String> callback) throws IllegalArgumentException;
-}

src/net/molez/mandlm/fotostream/server/CurrentImageURLServiceImpl.java

@@ -1,7 +1,6 @@
 package net.molez.mandlm.fotostream.server;
 
-import java.util.ArrayList;
-import java.util.List;
+import java.io.File;
 import java.util.Random;
 
 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
@@ -13,11 +12,10 @@ public class CurrentImageURLServiceImpl extends RemoteServiceServlet implements
 {
 	public String getCurrentImageURL() 
 	{
-		List<String> fileList = new ArrayList<String>();
+		File imageFolder = new File("img/");
 		
-		fileList.add("img/dummy_1.jpg");
-		fileList.add("img/dummy_2.jpg");
+		File[] fileList = imageFolder.listFiles();
 		
-		return fileList.get(new Random().nextInt(fileList.size()));
+		return fileList[new Random().nextInt(fileList.length)].getPath();
 	}
 }

src/net/molez/mandlm/fotostream/server/GreetingServiceImpl.java

@@ -1,45 +0,0 @@
-package net.molez.mandlm.fotostream.server;
-
-import net.molez.mandlm.fotostream.client.GreetingService;
-import net.molez.mandlm.fotostream.shared.FieldVerifier;
-import com.google.gwt.user.server.rpc.RemoteServiceServlet;
-
-/**
- * The server-side implementation of the RPC service.
- */
-@SuppressWarnings("serial")
-public class GreetingServiceImpl extends RemoteServiceServlet implements GreetingService {
-
-	public String greetServer(String input) throws IllegalArgumentException {
-		// Verify that the input is valid. 
-		if (!FieldVerifier.isValidName(input)) {
-			// If the input is not valid, throw an IllegalArgumentException back to
-			// the client.
-			throw new IllegalArgumentException("Name must be at least 4 characters long");
-		}
-
-		String serverInfo = getServletContext().getServerInfo();
-		String userAgent = getThreadLocalRequest().getHeader("User-Agent");
-
-		// Escape data from the client to avoid cross-site script vulnerabilities.
-		input = escapeHtml(input);
-		userAgent = escapeHtml(userAgent);
-
-		return "Hello, " + input + "!<br><br>I am running " + serverInfo + ".<br><br>It looks like you are using:<br>"
-				+ userAgent;
-	}
-
-	/**
-	 * Escape an html string. Escaping data received from the client helps to
-	 * prevent cross-site script vulnerabilities.
-	 * 
-	 * @param html the html string to escape
-	 * @return the escaped string
-	 */
-	private String escapeHtml(String html) {
-		if (html == null) {
-			return null;
-		}
-		return html.replaceAll("&", "&amp;").replaceAll("<", "&lt;").replaceAll(">", "&gt;");
-	}
-}

src/net/molez/mandlm/fotostream/shared/FieldVerifier.java

@@ -1,42 +0,0 @@
-package net.molez.mandlm.fotostream.shared;
-
-/**
- * <p>
- * FieldVerifier validates that the name the user enters is valid.
- * </p>
- * <p>
- * This class is in the <code>shared</code> package because we use it in both
- * the client code and on the server. On the client, we verify that the name is
- * valid before sending an RPC request so the user doesn't have to wait for a
- * network round trip to get feedback. On the server, we verify that the name is
- * correct to ensure that the input is correct regardless of where the RPC
- * originates.
- * </p>
- * <p>
- * When creating a class that is used on both the client and the server, be sure
- * that all code is translatable and does not use native JavaScript. Code that
- * is not translatable (such as code that interacts with a database or the file
- * system) cannot be compiled into client-side JavaScript. Code that uses native
- * JavaScript (such as Widgets) cannot be run on the server.
- * </p>
- */
-public class FieldVerifier {
-
-	/**
-	 * Verifies that the specified name is valid for our service.
-	 * 
-	 * In this example, we only require that the name is at least four
-	 * characters. In your application, you can use more complex checks to ensure
-	 * that usernames, passwords, email addresses, URLs, and other fields have the
-	 * proper syntax.
-	 * 
-	 * @param name the name to validate
-	 * @return true if valid, false if invalid
-	 */
-	public static boolean isValidName(String name) {
-		if (name == null) {
-			return false;
-		}
-		return name.length() > 3;
-	}
-}

war/FotoStream.css

@@ -1,34 +1,8 @@
 /** Add css rules here for your application. */
 
 
-/** Example rules used by the template application (remove for your app) */
-h1 {
-  font-size: 2em;
-  font-weight: bold;
-  color: #777777;
-  margin: 40px 0px 70px;
-  text-align: center;
+body {
+    background-color: black;
 }
 
-.sendButton {
-  display: block;
-  font-size: 16pt;
-}
 
-/** Most GWT widgets already have a style name defined */
-.gwt-DialogBox {
-  width: 400px;
-}
-
-.dialogVPanel {
-  margin: 5px;
-}
-
-.serverResponseLabelError {
-  color: red;
-}
-
-/** Set ids using widget.getElement().setId("idOfElement") */
-#closeButton {
-  margin: 15px 6px 6px;
-}

war/FotoStream.html

@@ -16,7 +16,7 @@
     <!--                                           -->
     <!-- Any title is fine                         -->
     <!--                                           -->
-    <title>Web Application Starter Project</title>
+    <title>FotoStream</title>
     
     <!--                                           -->
     <!-- This script loads your compiled module.   -->
@@ -32,10 +32,6 @@
   <!-- to create a completely dynamic UI.        -->
   <!--                                           -->
   <body>
-
-    <!-- OPTIONAL: include this if you want history support -->
-    <iframe src="javascript:''" id="__gwt_historyFrame" tabIndex='-1' style="position:absolute;width:0;height:0;border:0"></iframe>
-    
     <!-- RECOMMENDED if your web app will not function without JavaScript enabled -->
     <noscript>
       <div style="width: 22em; position: absolute; left: 50%; margin-left: -11em; color: red; background-color: white; border: 1px solid red; padding: 4px; font-family: sans-serif">
@@ -44,22 +40,6 @@
       </div>
     </noscript>
 
-    <h1>Web Application Starter Project</h1>
-
-    <table align="center">
-      <tr>
-        <td colspan="2" style="font-weight:bold;">Please enter your name:</td>        
-      </tr>
-      <tr>
-        <td id="nameFieldContainer"></td>
-        <td id="sendButtonContainer"></td>
-      </tr>
-      <tr>
-        <td colspan="2" style="color:red;" id="errorLabelContainer"></td>
-      </tr>
-      <tr>
-      <td colspan="2" id="imageContainer"></td>
-    </tr>
-    </table>
+    <div id="imageContainer"></div>
   </body>
 </html>

war/WEB-INF/web.xml

@@ -6,15 +6,6 @@
          xmlns="http://java.sun.com/xml/ns/javaee">
 
   <!-- Servlets -->
-  <servlet>
-    <servlet-name>greetServlet</servlet-name>
-    <servlet-class>net.molez.mandlm.fotostream.server.GreetingServiceImpl</servlet-class>
-  </servlet>
-  
-  <servlet-mapping>
-    <servlet-name>greetServlet</servlet-name>
-    <url-pattern>/fotostream/greet</url-pattern>
-  </servlet-mapping>
   
   <servlet>
   	<servlet-name>currentImageURLServlet</servlet-name>