Add handler to clean up project config registry

wsagent/che-core-api-project/src/main/java/org/eclipse/che/api/project/server/ProjectApiModule.java

@@ -28,6 +28,7 @@
 import org.eclipse.che.api.project.server.impl.RegisteredProject;
 import org.eclipse.che.api.project.server.impl.RegisteredProjectFactory;
 import org.eclipse.che.api.project.server.impl.RootDirCreationHandler;
+import org.eclipse.che.api.project.server.impl.RootDirRemovalHandler;
 import org.eclipse.che.api.project.server.impl.ValidatingProjectManager;
 import org.eclipse.che.api.project.server.impl.WorkspaceProjectSynchronizer;
 import org.eclipse.che.api.project.server.impl.ZipProjectImporter;
@@ -62,6 +63,7 @@ protected void configure() {
     bind(ProjectHandlerRegistry.class);
 
     bind(RootDirCreationHandler.class).asEagerSingleton();
+    bind(RootDirRemovalHandler.class).asEagerSingleton();
 
     bind(ProjectManager.class).to(ValidatingProjectManager.class);
     bind(ProjectSynchronizer.class).to(WorkspaceProjectSynchronizer.class);

wsagent/che-core-api-project/src/main/java/org/eclipse/che/api/project/server/impl/RootDirRemovalHandler.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2012-2018 Red Hat, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *   Red Hat, Inc. - initial API and implementation
+ */
+package org.eclipse.che.api.project.server.impl;
+
+import static org.eclipse.che.api.fs.server.WsPathUtils.ROOT;
+
+import javax.annotation.PostConstruct;
+import javax.inject.Inject;
+import javax.inject.Singleton;
+import org.eclipse.che.api.core.ServerException;
+import org.eclipse.che.api.project.server.ProjectManager;
+import org.eclipse.che.api.watcher.server.FileWatcherManager;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Cleans up project config registry when some project is removed bypassing {@link ProjectManager}
+ *
+ * @author Roman Nikitenko
+ */
+@Singleton
+public class RootDirRemovalHandler {
+  private static final Logger LOGGER = LoggerFactory.getLogger(RootDirRemovalHandler.class);
+
+  private final ProjectSynchronizer projectSynchronizer;
+  private final ProjectConfigRegistry projectConfigRegistry;
+  private final FileWatcherManager fileWatcherManager;
+
+  @Inject
+  public RootDirRemovalHandler(
+      ProjectSynchronizer projectSynchronizer,
+      ProjectConfigRegistry projectConfigRegistry,
+      FileWatcherManager fileWatcherManager) {
+    this.projectSynchronizer = projectSynchronizer;
+    this.projectConfigRegistry = projectConfigRegistry;
+    this.fileWatcherManager = fileWatcherManager;
+  }
+
+  @PostConstruct
+  private void registerOperation() {
+    fileWatcherManager.registerByPath(ROOT, arg -> {}, arg -> {}, this::consumeDelete);
+  }
+
+  private void consumeDelete(String wsPath) {
+    try {
+      if (projectConfigRegistry.isRegistered(wsPath)) {
+        projectConfigRegistry.remove(wsPath);
+        projectSynchronizer.synchronize();
+      }
+    } catch (ServerException e) {
+      LOGGER.error(
+          "Removing project '{}' is detected. Cleaning project config registry is failed: {}",
+          wsPath,
+          e.getMessage());
+    }
+  }
+}