show error message when there is a connection problem issue

git-svn-id: http://svn.research-infrastructures.eu/public/d4science/gcube/trunk/portlets/user/message-conversations@154652 82a268e6-3cf1-43bd-a215-b396298e98cf

src/main/java/org/gcube/portets/user/message_conversations/client/MessageConversations.java

@@ -3,8 +3,6 @@ package org.gcube.portets.user.message_conversations.client;
 import org.gcube.portets.user.message_conversations.client.ui.ApplicationView;
 
 import com.google.gwt.core.client.EntryPoint;
-import com.google.gwt.core.client.GWT;
-import com.google.gwt.user.client.rpc.ServiceDefTarget;
 import com.google.gwt.user.client.ui.RootPanel;
 
 /**
@@ -13,28 +11,14 @@ import com.google.gwt.user.client.ui.RootPanel;
 public class MessageConversations implements EntryPoint {
 	public static final String DIV_CONTAINER_ID = "create-users-container";
 	public static final String ARTIFACT_ID = "messages";
-	/**
-	 * Create a remote service proxy to talk to the server-side Greeting service.
-	 */
 	
-	private final MessageServiceAsync convService = GWT.create(MessageService.class);
 	private ApplicationView ap;
 
 	/**
 	 * This is the entry point method.
 	 */
 	public void onModuleLoad() {
-		((ServiceDefTarget) convService).setServiceEntryPoint(Utils.getServiceEntryPoint());
 		ap = new ApplicationView();
 		RootPanel.get(DIV_CONTAINER_ID).add(ap);
-		ap.readUserMessages(false);
-		
 	}
-
-	
-
-	
-
-	
-	
 }

src/main/java/org/gcube/portets/user/message_conversations/client/ui/ApplicationView.java

@@ -115,6 +115,7 @@ public class ApplicationView extends Composite {
 			forward.setTooltip("Forward");
 			forward.setTooltipPosition(Position.LEFT);
 		}
+		readUserMessages(false);
 	}
 
 	/**
@@ -140,12 +141,18 @@ public class ApplicationView extends Composite {
 						messageLoader.setVisible(false);
 					}
 				} else {
-					RootPanel.get("create-users-container").add(new HTML("It is impossible to read your messages at this time. "
-							+ "This could be a server error, please try to reload the page"));
+					showErrorOccurred();
 				}
 			}
 		});
 	}
+	private void showErrorOccurred() {
+		messagesCollection.clear();
+		messagesLoader.setVisible(false);
+		messageLoader.setVisible(false);
+		hideSidePanel();
+		writeErrorMessage();
+	}
 	/**
 	 * 
 	 * @param messages
@@ -375,4 +382,20 @@ public class ApplicationView extends Composite {
 		totalMessages++;
 		updateBadge(false);
 	}
+	
+	private void writeErrorMessage() {
+		MessagesResources images = GWT.create(MessagesResources.class);
+		List<MessageUserModel> recipients = Arrays.asList(new MessageUserModel(0, "you", "You", ""));
+		@SuppressWarnings("deprecation")
+		MessageUserModel sender = new MessageUserModel(0, "jarvis", "D4Science Team", images.d4scienceTeam().getURL(), "", "");
+		ConvMessage welcomeMessage = new ConvMessage("0", "An error occurred!", sender, recipients , new Date(), MessagesResources.ERROR_MESSAGE, true, false);
+		FAB.setVisible(false);
+		displayMessage.showMessage(welcomeMessage);
+		welcomeMessage.setContent(MessagesResources.ERROR_MESSAGE.substring(0, 102)+ " ...");
+		MessageItem item = new MessageItem(welcomeMessage, messagesCollection, this, false);
+		item.hideMessageMenu();
+		messagesCollection.add(item);
+		totalMessages++;
+		updateBadge(false);
+	}
 }

src/main/java/org/gcube/portets/user/message_conversations/client/ui/resources/MessagesResources.java

@@ -8,6 +8,9 @@ public interface MessagesResources extends ClientBundle {
 			"Also, you can easily attach very large files to your messages from Workspace." +
 			"\n\nThis message will automatically be deleted as soon you'll receive another one.";
 
+	public static final String ERROR_MESSAGE = "We are very sorry, it is impossible to read your messages at the moment.\n\nThis could be either a networking problem or an error on the server."
+			+ " Please try to reload this page, if the error persists report the issue.";
+
 	@Source("group.png")
 	ImageResource group();
 

src/main/java/org/gcube/portets/user/message_conversations/server/ConvServiceImpl.java

@@ -121,9 +121,14 @@ public class ConvServiceImpl extends RemoteServiceServlet implements MessageServ
 				e.printStackTrace();
 				return null;
 			}
-
-			List<WorkspaceMessage> listMessages = (sent) ? 
+			List<WorkspaceMessage> listMessages = null;
+			try {
+				listMessages = (sent) ? 
 						workspace.getWorkspaceMessageManager().getSentMessages() : workspace.getWorkspaceMessageManager().getReceivedMessages();
+			} catch (Exception e) {
+				_log.error("Could not read messages of " + user.getFullname());
+				return null;
+			}
 			_log.debug("Got messages of " + user.getFullname() + " how many? " + listMessages.size());
 			//the messages are returned from the oldest to the new one, so we reverse them
 			Collections.reverse(listMessages);
@@ -188,6 +193,7 @@ public class ConvServiceImpl extends RemoteServiceServlet implements MessageServ
 			}
 		} catch (Exception e) {
 			e.printStackTrace();
+			return null;
 		}
 		_log.trace("get All Messages Received ");
 		return toReturn;