Switch editors in read only mode when ws agent has stopped (#9912)

* CHE-9620. Switch editors in read only mode when ws agent has stopped
Signed-off-by: Roman Nikitenko <rnikiten@redhat.com>

ide/che-core-ide-app/src/main/java/org/eclipse/che/ide/CoreLocalizationConstant.java

@@ -1186,6 +1186,9 @@ public interface CoreLocalizationConstant extends Messages {
   @Key("message.projectCreated")
   String projectCreated(String projectName);
 
+  @Key("message.switch.editors.in.readOnly.mode")
+  String messageSwitchEditorsInReadOnlyMode();
+
   @Key("ssh.connect.info")
   String sshConnectInfo(
       String machineName,

ide/che-core-ide-app/src/main/java/org/eclipse/che/ide/editor/EditorAgentImpl.java

@@ -13,8 +13,10 @@ package org.eclipse.che.ide.editor;
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.collect.Lists.newArrayList;
 import static java.lang.Boolean.parseBoolean;
+import static java.util.stream.Collectors.toList;
 import static org.eclipse.che.ide.api.notification.StatusNotification.DisplayMode.EMERGE_MODE;
 import static org.eclipse.che.ide.api.notification.StatusNotification.Status.FAIL;
+import static org.eclipse.che.ide.api.notification.StatusNotification.Status.WARNING;
 import static org.eclipse.che.ide.api.parts.PartStackType.EDITING;
 
 import com.google.gwt.core.client.Scheduler;
@@ -74,6 +76,7 @@ import org.eclipse.che.ide.api.selection.SelectionChangedEvent;
 import org.eclipse.che.ide.api.selection.SelectionChangedHandler;
 import org.eclipse.che.ide.api.statepersistance.StateComponent;
 import org.eclipse.che.ide.api.workspace.event.WorkspaceStoppedEvent;
+import org.eclipse.che.ide.api.workspace.event.WsAgentServerStoppedEvent;
 import org.eclipse.che.ide.editor.synchronization.EditorContentSynchronizer;
 import org.eclipse.che.ide.part.editor.multipart.EditorMultiPartStackPresenter;
 import org.eclipse.che.ide.part.explorer.project.ProjectExplorerPresenter;
@@ -94,7 +97,8 @@ public class EditorAgentImpl
         ActivePartChangedHandler,
         SelectionChangedHandler,
         StateComponent,
-        WorkspaceStoppedEvent.Handler {
+        WorkspaceStoppedEvent.Handler,
+        WsAgentServerStoppedEvent.Handler {
 
   private final EventBus eventBus;
   private final WorkspaceAgent workspaceAgent;
@@ -146,6 +150,7 @@ public class EditorAgentImpl
     eventBus.addHandler(ActivePartChangedEvent.TYPE, this);
     eventBus.addHandler(SelectionChangedEvent.TYPE, this);
     eventBus.addHandler(WorkspaceStoppedEvent.TYPE, this);
+    eventBus.addHandler(WsAgentServerStoppedEvent.TYPE, this);
   }
 
   @Override
@@ -805,6 +810,35 @@ public class EditorAgentImpl
     }
   }
 
+  @Override
+  public void onWsAgentServerStopped(WsAgentServerStoppedEvent event) {
+    List<EditorPartPresenter> editorsToReadOnlyMode =
+        getOpenedEditors()
+            .stream()
+            .filter(
+                editor ->
+                    editor instanceof HasReadOnlyProperty
+                        && !((HasReadOnlyProperty) editor).isReadOnly())
+            .collect(toList());
+
+    if (editorsToReadOnlyMode.isEmpty()) {
+      return;
+    }
+
+    notificationManager.notify(
+        "", coreLocalizationConstant.messageSwitchEditorsInReadOnlyMode(), WARNING, EMERGE_MODE);
+
+    editorsToReadOnlyMode.forEach(
+        editor -> {
+          EditorTab editorTab = editorMultiPartStack.getTabByPart(editor);
+          if (editorTab != null) {
+            editorTab.setReadOnlyMark(true);
+          }
+
+          ((HasReadOnlyProperty) editor).setReadOnly(true);
+        });
+  }
+
   private static class RestoreStateEditorCallBack extends OpenEditorCallbackImpl {
     private final int cursorOffset;
     private final int topLine;

ide/che-core-ide-app/src/main/resources/org/eclipse/che/ide/CoreLocalizationConstant.properties

@@ -278,6 +278,7 @@ messages.startingMachine=Starting machine \"{0}\"
 messages.startingOperation=Starting {0}
 messages.machine.not.found=Machine {0} not found
 message.projectCreated=Project {0} created
+message.switch.editors.in.readOnly.mode=Workspace agent is not running, open editors are switched to read-only mode
 
 ############### Buttons ###############################
 ok = OK