RuleChain page implementation.

@@ -3,6 +3,10 @@
     "target": "http://localhost:8080",
     "secure": false
   },
+  "/static/rulenode": {
+    "target": "http://localhost:8080",
+    "secure": false
+  },
   "/api/ws": {
     "target": "ws://localhost:8080",
     "ws": true

+///
+/// Copyright © 2016-2019 The Thingsboard Authors
+///
+/// Licensed under the Apache License, Version 2.0 (the "License");
+/// you may not use this file except in compliance with the License.
+/// You may obtain a copy of the License at
+///
+///     http://www.apache.org/licenses/LICENSE-2.0
+///
+/// Unless required by applicable law or agreed to in writing, software
+/// distributed under the License is distributed on an "AS IS" BASIS,
+/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+/// See the License for the specific language governing permissions and
+/// limitations under the License.
+///
+
+import { Injectable } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+import { ComponentDescriptor, ComponentType } from '@shared/models/component-descriptor.models';
+import { defaultHttpOptionsFromConfig, RequestConfig } from '@core/http/http-utils';
+import { Observable, of } from 'rxjs';
+import { RuleChainMetaData } from '@shared/models/rule-chain.models';
+import { tap, map } from 'rxjs/operators';
+import { RuleNodeType } from '@shared/models/rule-node.models';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class ComponentDescriptorService {
+
+  private componentsByType: Map<ComponentType | RuleNodeType, Array<ComponentDescriptor>> =
+    new Map<ComponentType, Array<ComponentDescriptor>>();
+  private componentsByClazz: Map<string, ComponentDescriptor> = new Map<string, ComponentDescriptor>();
+
+  constructor(
+    private http: HttpClient
+  ) {
+  }
+
+  public getComponentDescriptorsByType(componentType: ComponentType, config?: RequestConfig): Observable<Array<ComponentDescriptor>> {
+    const existing = this.componentsByType.get(componentType);
+    if (existing) {
+      return of(existing);
+    } else {
+      return this.http.get<Array<ComponentDescriptor>>(`/api/components/${componentType}`, defaultHttpOptionsFromConfig(config)).pipe(
+        map((componentDescriptors) => {
+          this.componentsByType.set(componentType, componentDescriptors);
+          componentDescriptors.forEach((componentDescriptor) => {
+            this.componentsByClazz.set(componentDescriptor.clazz, componentDescriptor);
+          });
+          return componentDescriptors;
+        })
+      );
+    }
+  }
+
+  public getComponentDescriptorsByTypes(componentTypes: Array<ComponentType>,
+                                        config?: RequestConfig): Observable<Array<ComponentDescriptor>> {
+    let result: ComponentDescriptor[] = [];
+    for (let i = componentTypes.length - 1; i >= 0; i--) {
+      const componentType = componentTypes[i];
+      const componentDescriptors = this.componentsByType.get(componentType);
+      if (componentDescriptors) {
+        result = result.concat(componentDescriptors);
+        componentTypes.splice(i, 1);
+      }
+    }
+    if (!componentTypes.length) {
+      return of(result);
+    } else {
+      return this.http.get<Array<ComponentDescriptor>>(`/api/components?componentTypes=${componentTypes.join(',')}`,
+        defaultHttpOptionsFromConfig(config)).pipe(
+        map((componentDescriptors) => {
+          componentDescriptors.forEach((componentDescriptor) => {
+            let componentsList = this.componentsByType.get(componentDescriptor.type);
+            if (!componentsList) {
+              componentsList = new Array<ComponentDescriptor>();
+              this.componentsByType.set(componentDescriptor.type, componentsList);
+            }
+            componentsList.push(componentDescriptor);
+            this.componentsByClazz.set(componentDescriptor.clazz, componentDescriptor);
+          });
+          result = result.concat(componentDescriptors);
+          return result;
+        })
+      );
+    }
+  }
+
+  public getComponentDescriptorByClazz(componentDescriptorClazz: string, config?: RequestConfig): Observable<ComponentDescriptor> {
+    const existing = this.componentsByClazz.get(componentDescriptorClazz);
+    if (existing) {
+      return of(existing);
+    } else {
+      return this.http.get<ComponentDescriptor>(`/api/component/${componentDescriptorClazz}`, defaultHttpOptionsFromConfig(config)).pipe(
+        map((componentDescriptor) => {
+          this.componentsByClazz.set(componentDescriptorClazz, componentDescriptor);
+          return componentDescriptor;
+        })
+      );
+    }
+  }
+}

@@ -14,21 +14,39 @@
 /// limitations under the License.
 ///
 
-import {Injectable} from '@angular/core';
-import { defaultHttpOptions, defaultHttpOptionsFromConfig, RequestConfig } from './http-utils';
-import {Observable} from 'rxjs/index';
-import {HttpClient} from '@angular/common/http';
-import {PageLink} from '@shared/models/page/page-link';
-import {PageData} from '@shared/models/page/page-data';
-import {RuleChain} from '@shared/models/rule-chain.models';
+import { Injectable } from '@angular/core';
+import { defaultHttpOptionsFromConfig, RequestConfig } from './http-utils';
+import { forkJoin, Observable, of } from 'rxjs/index';
+import { HttpClient } from '@angular/common/http';
+import { PageLink } from '@shared/models/page/page-link';
+import { PageData } from '@shared/models/page/page-data';
+import {
+  ResolvedRuleChainMetaData,
+  RuleChain, RuleChainConnectionInfo,
+  RuleChainMetaData,
+  ruleChainNodeComponent,
+  ruleNodeTypeComponentTypes, unknownNodeComponent
+} from '@shared/models/rule-chain.models';
+import { ComponentDescriptorService } from './component-descriptor.service';
+import { RuleNodeComponentDescriptor } from '@app/shared/models/rule-node.models';
+import { ResourcesService } from '../services/resources.service';
+import { catchError, map, mergeMap } from 'rxjs/operators';
+import { TranslateService } from '@ngx-translate/core';
+import { EntityType } from '@shared/models/entity-type.models';
+import { deepClone } from '@core/utils';
 
 @Injectable({
   providedIn: 'root'
 })
 export class RuleChainService {
 
+  private ruleNodeComponents: Array<RuleNodeComponentDescriptor>;
+
   constructor(
-    private http: HttpClient
+    private http: HttpClient,
+    private componentDescriptorService: ComponentDescriptorService,
+    private resourcesService: ResourcesService,
+    private translate: TranslateService
   ) { }
 
   public getRuleChains(pageLink: PageLink, config?: RequestConfig): Observable<PageData<RuleChain>> {
@@ -52,4 +70,159 @@ export class RuleChainService {
     return this.http.post<RuleChain>(`/api/ruleChain/${ruleChainId}/root`, null, defaultHttpOptionsFromConfig(config));
   }
 
+  public getRuleChainMetadata(ruleChainId: string, config?: RequestConfig): Observable<RuleChainMetaData> {
+    return this.http.get<RuleChainMetaData>(`/api/ruleChain/${ruleChainId}/metadata`, defaultHttpOptionsFromConfig(config));
+  }
+
+  public getResolvedRuleChainMetadata(ruleChainId: string, config?: RequestConfig): Observable<ResolvedRuleChainMetaData> {
+    return this.getRuleChainMetadata(ruleChainId, config).pipe(
+      mergeMap((ruleChainMetaData) => {
+        return this.resolveTargetRuleChains(ruleChainMetaData.ruleChainConnections).pipe(
+          map((targetRuleChainsMap) => {
+            const resolvedRuleChainMetadata: ResolvedRuleChainMetaData = {...ruleChainMetaData, targetRuleChainsMap};
+            return resolvedRuleChainMetadata;
+          })
+        );
+      })
+    );
+  }
+
+  public saveRuleChainMetadata(ruleChainMetaData: RuleChainMetaData, config?: RequestConfig): Observable<RuleChainMetaData> {
+    return this.http.post<RuleChainMetaData>('/api/ruleChain/metadata', ruleChainMetaData, defaultHttpOptionsFromConfig(config));
+  }
+
+  public saveAndGetResolvedRuleChainMetadata(ruleChainMetaData: RuleChainMetaData,
+                                             config?: RequestConfig): Observable<ResolvedRuleChainMetaData> {
+    return this.saveRuleChainMetadata(ruleChainMetaData, config).pipe(
+      mergeMap((savedRuleChainMetaData) => {
+        return this.resolveTargetRuleChains(savedRuleChainMetaData.ruleChainConnections).pipe(
+          map((targetRuleChainsMap) => {
+            const resolvedRuleChainMetadata: ResolvedRuleChainMetaData = {...savedRuleChainMetaData, targetRuleChainsMap};
+            return resolvedRuleChainMetadata;
+          })
+        );
+      })
+    );
+  }
+
+  public getRuleNodeComponents(config?: RequestConfig): Observable<Array<RuleNodeComponentDescriptor>> {
+     if (this.ruleNodeComponents) {
+       return of(this.ruleNodeComponents);
+     } else {
+      return this.loadRuleNodeComponents(config).pipe(
+        mergeMap((components) => {
+          return this.resolveRuleNodeComponentsUiResources(components).pipe(
+            map((ruleNodeComponents) => {
+              this.ruleNodeComponents = ruleNodeComponents;
+              this.ruleNodeComponents.push(ruleChainNodeComponent);
+              this.ruleNodeComponents.sort(
+                (comp1, comp2) => {
+                  let result = comp1.type.toString().localeCompare(comp2.type.toString());
+                  if (result === 0) {
+                    result = comp1.name.localeCompare(comp2.name);
+                  }
+                  return result;
+                }
+              );
+              return this.ruleNodeComponents;
+            })
+          );
+        })
+      );
+    }
+  }
+
+  public getRuleNodeComponentByClazz(clazz: string): RuleNodeComponentDescriptor {
+    const found = this.ruleNodeComponents.filter((component) => component.clazz === clazz);
+    if (found && found.length) {
+      return found[0];
+    } else {
+      const unknownComponent = deepClone(unknownNodeComponent);
+      unknownComponent.clazz = clazz;
+      unknownComponent.configurationDescriptor.nodeDefinition.details = 'Unknown Rule Node class: ' + clazz;
+      return unknownComponent;
+    }
+  }
+
+  private resolveTargetRuleChains(ruleChainConnections: Array<RuleChainConnectionInfo>): Observable<{[ruleChainId: string]: RuleChain}> {
+    if (ruleChainConnections && ruleChainConnections.length) {
+      const tasks: Observable<RuleChain>[] = [];
+      ruleChainConnections.forEach((connection) => {
+        tasks.push(this.resolveRuleChain(connection.targetRuleChainId.id));
+      });
+      return forkJoin(tasks).pipe(
+        map((ruleChains) => {
+          const ruleChainsMap: {[ruleChainId: string]: RuleChain} = {};
+          ruleChains.forEach((ruleChain) => {
+            ruleChainsMap[ruleChain.id.id] = ruleChain;
+          });
+          return ruleChainsMap;
+        })
+      );
+    } else {
+      return of({} as {[ruleChainId: string]: RuleChain});
+    }
+  }
+
+  private loadRuleNodeComponents(config?: RequestConfig): Observable<Array<RuleNodeComponentDescriptor>> {
+    return this.componentDescriptorService.getComponentDescriptorsByTypes(ruleNodeTypeComponentTypes, config).pipe(
+      map((components) => {
+        const ruleNodeComponents: RuleNodeComponentDescriptor[] = [];
+        components.forEach((component) => {
+          ruleNodeComponents.push(component as RuleNodeComponentDescriptor);
+        });
+        return ruleNodeComponents;
+      })
+    );
+  }
+
+  private resolveRuleNodeComponentsUiResources(components: Array<RuleNodeComponentDescriptor>):
+    Observable<Array<RuleNodeComponentDescriptor>> {
+    const tasks: Observable<RuleNodeComponentDescriptor>[] = [];
+    components.forEach((component) => {
+      tasks.push(this.resolveRuleNodeComponentUiResources(component));
+    });
+    return forkJoin(tasks).pipe(
+      catchError((err) => {
+        return of(components);
+      })
+    );
+  }
+
+  private resolveRuleNodeComponentUiResources(component: RuleNodeComponentDescriptor): Observable<RuleNodeComponentDescriptor> {
+    const uiResources = component.configurationDescriptor.nodeDefinition.uiResources;
+    if (uiResources && uiResources.length) {
+      const tasks: Observable<any>[] = [];
+      uiResources.forEach((uiResource) => {
+        tasks.push(this.resourcesService.loadResource(uiResource));
+      });
+      return forkJoin(tasks).pipe(
+        map((res) => {
+          return component;
+        }),
+        catchError(() => {
+          component.configurationDescriptor.nodeDefinition.uiResourceLoadError = this.translate.instant('rulenode.ui-resources-load-error');
+          return of(component);
+        })
+      );
+    } else {
+      return of(component);
+    }
+  }
+
+  private resolveRuleChain(ruleChainId: string): Observable<RuleChain> {
+    return this.getRuleChain(ruleChainId, {ignoreErrors: true}).pipe(
+      map(ruleChain => ruleChain),
+      catchError((err) => {
+        const ruleChain = {
+          id: {
+            entityType: EntityType.RULE_CHAIN,
+            id: ruleChainId
+          }
+        } as RuleChain;
+        return of(ruleChain);
+      })
+    );
+  }
+
 }

@@ -17,9 +17,9 @@
 -->
 <fc-canvas #fcCanvas
            id="fc-target-canvas"
-           [model]="model"
+           [model]="ruleChainModel"
            (modelChanged)="onModelChanged()"
-           [selectedObjects]="selected"
+           [selectedObjects]="selectedObjects"
            [edgeStyle]="flowchartConstants.curvedStyle"
            [automaticResize]="true"
            [dragAnimation]="flowchartConstants.dragAnimationRepaint">

@@ -14,160 +14,341 @@
 /// limitations under the License.
 ///
 
-import {Component, OnInit} from '@angular/core';
-import {UserService} from '@core/http/user.service';
-import {User} from '@shared/models/user.model';
-import {Authority} from '@shared/models/authority.enum';
-import {PageComponent} from '@shared/components/page.component';
-import {Store} from '@ngrx/store';
-import {AppState} from '@core/core.state';
-import {FormBuilder, FormGroup, Validators} from '@angular/forms';
-import {HasConfirmForm} from '@core/guards/confirm-on-exit.guard';
-import {ActionAuthUpdateUserDetails} from '@core/auth/auth.actions';
-import {environment as env} from '@env/environment';
-import {TranslateService} from '@ngx-translate/core';
-import {ActionSettingsChangeLanguage} from '@core/settings/settings.actions';
-import {ChangePasswordDialogComponent} from '@modules/home/pages/profile/change-password-dialog.component';
-import {MatDialog} from '@angular/material';
-import {DialogService} from '@core/services/dialog.service';
-import {AuthService} from '@core/auth/auth.service';
-import {ActivatedRoute} from '@angular/router';
-import { Dashboard } from '@shared/models/dashboard.models';
-import { RuleChain } from '@shared/models/rule-chain.models';
-import { FcModel, FlowchartConstants } from 'ngx-flowchart/dist/ngx-flowchart';
+import { Component, OnInit } from '@angular/core';
+import { PageComponent } from '@shared/components/page.component';
+import { Store } from '@ngrx/store';
+import { AppState } from '@core/core.state';
+import { FormBuilder } from '@angular/forms';
+import { HasDirtyFlag } from '@core/guards/confirm-on-exit.guard';
+import { TranslateService } from '@ngx-translate/core';
+import { MatDialog } from '@angular/material';
+import { DialogService } from '@core/services/dialog.service';
+import { AuthService } from '@core/auth/auth.service';
+import { ActivatedRoute, Router } from '@angular/router';
+import {
+  inputNodeComponent,
+  ResolvedRuleChainMetaData,
+  RuleChain,
+  ruleChainNodeComponent
+} from '@shared/models/rule-chain.models';
+import { FlowchartConstants } from 'ngx-flowchart/dist/ngx-flowchart';
+import { RuleNodeComponentDescriptor, RuleNodeType, ruleNodeTypeDescriptors } from '@shared/models/rule-node.models';
+import { FcRuleEdge, FcRuleNode, FcRuleNodeModel, FcRuleNodeType, FcRuleNodeTypeModel } from './rulechain-page.models';
+import { RuleChainService } from '@core/http/rule-chain.service';
 
 @Component({
   selector: 'tb-rulechain-page',
   templateUrl: './rulechain-page.component.html',
   styleUrls: []
 })
-export class RuleChainPageComponent extends PageComponent implements OnInit {
+export class RuleChainPageComponent extends PageComponent implements OnInit, HasDirtyFlag {
+
+  get isDirty(): boolean {
+    return this.isDirtyValue || this.isImport;
+  }
+
+  isImport: boolean;
+  isDirtyValue: boolean;
+
+  errorTooltips = {};
+  isFullscreen = false;
+
+  editingRuleNode = null;
+  isEditingRuleNode = false;
+
+  editingRuleNodeLink = null;
+  isEditingRuleNodeLink = false;
+
+  isLibraryOpen = true;
+
+  ruleNodeSearch = '';
 
   ruleChain: RuleChain;
+  ruleChainMetaData: ResolvedRuleChainMetaData;
 
-  flowchartConstants = FlowchartConstants;
-  selected = [];
-  model: FcModel = {
+  ruleChainModel: FcRuleNodeModel = {
     nodes: [],
     edges: []
   };
+  selectedObjects = [];
+  nextNodeID: number;
+  nextConnectorID: number;
+  inputConnectorId: number;
+
+  ruleNodeTypesModel: {[type: string]: {model: FcRuleNodeTypeModel, selectedObjects: any[]}} = {};
+
+  ruleNodeComponents: Array<RuleNodeComponentDescriptor>;
+
+  flowchartConstants = FlowchartConstants;
 
   constructor(protected store: Store<AppState>,
               private route: ActivatedRoute,
-              private userService: UserService,
+              private router: Router,
+              private ruleChainService: RuleChainService,
               private authService: AuthService,
               private translate: TranslateService,
               public dialog: MatDialog,
               public dialogService: DialogService,
               public fb: FormBuilder) {
     super(store);
+    this.init();
   }
 
   ngOnInit() {
+  }
+
+  private init() {
     this.ruleChain = this.route.snapshot.data.ruleChain;
-    this.testData();
+    if (this.route.snapshot.data.import && !this.ruleChain) {
+      this.router.navigateByUrl('ruleChains');
+      return;
+    }
+    this.isImport = this.route.snapshot.data.import;
+    this.ruleChainMetaData = this.route.snapshot.data.ruleChainMetaData;
+    this.ruleNodeComponents = this.route.snapshot.data.ruleNodeComponents;
+    for (const type of Object.keys(RuleNodeType)) {
+      const desc = ruleNodeTypeDescriptors.get(RuleNodeType[type]);
+      if (!desc.special) {
+        this.ruleNodeTypesModel[type] = {
+          model: {
+            nodes: [],
+            edges: []
+          },
+          selectedObjects: []
+        };
+      }
+    }
+    this.loadRuleChainLibrary(this.ruleNodeComponents);
+    this.createRuleChainModel();
   }
 
-  onModelChanged() {
-    console.log('Model changed!');
+  private loadRuleChainLibrary(ruleNodeComponents: Array<RuleNodeComponentDescriptor>) {
+    for (const componentType of Object.keys(this.ruleNodeTypesModel)) {
+      this.ruleNodeTypesModel[componentType].model.nodes.length = 0;
+    }
+    ruleNodeComponents.forEach((ruleNodeComponent) => {
+      const componentType = ruleNodeComponent.type;
+      const model = this.ruleNodeTypesModel[componentType].model;
+      const desc = ruleNodeTypeDescriptors.get(RuleNodeType[componentType]);
+      let icon = desc.icon;
+      let iconUrl = null;
+      if (ruleNodeComponent.configurationDescriptor.nodeDefinition.icon) {
+        icon = ruleNodeComponent.configurationDescriptor.nodeDefinition.icon;
+      }
+      if (ruleNodeComponent.configurationDescriptor.nodeDefinition.iconUrl) {
+        iconUrl = ruleNodeComponent.configurationDescriptor.nodeDefinition.iconUrl;
+      }
+      const node: FcRuleNodeType = {
+        id: 'node-lib-' + componentType + '-' + model.nodes.length,
+        component: ruleNodeComponent,
+        name: '',
+        nodeClass: desc.nodeClass,
+        icon,
+        iconUrl,
+        x: 30,
+        y: 10 + 50 * model.nodes.length,
+        connectors: []
+      };
+      if (ruleNodeComponent.configurationDescriptor.nodeDefinition.inEnabled) {
+        node.connectors.push(
+          {
+            type: FlowchartConstants.leftConnectorType,
+            id: (model.nodes.length * 2) + ''
+          }
+        );
+      }
+      if (ruleNodeComponent.configurationDescriptor.nodeDefinition.outEnabled) {
+        node.connectors.push(
+          {
+            type: FlowchartConstants.rightConnectorType,
+            id: (model.nodes.length * 2 + 1) + ''
+          }
+        );
+      }
+      model.nodes.push(node);
+    });
   }
 
-  private testData() {
-    this.model.nodes.push(...
-      [
-        {
-          name: 'Node 1',
-          readonly: true,
-          id: '2',
-          x: 300,
-          y: 100,
-          color: '#000',
-          borderColor: '#000',
-          connectors: [
-            {
-              type: FlowchartConstants.leftConnectorType,
-              id: '1'
-            },
-            {
-              type: FlowchartConstants.rightConnectorType,
-              id: '2'
-            }
-          ]
-        },
-        {
-          name: 'Node 2',
-          id: '3',
-          x: 600,
-          y: 100,
-          color: '#F15B26',
-          connectors: [
-            {
-              type: FlowchartConstants.leftConnectorType,
-              id: '3'
-            },
-            {
-              type: FlowchartConstants.rightConnectorType,
-              id: '4'
-            }
-          ]
-        },
-        {
-          name: 'Node 3',
-          id: '4',
-          x: 1000,
-          y: 100,
-          color: '#000',
-          borderColor: '#000',
-          connectors: [
-            {
-              type: FlowchartConstants.leftConnectorType,
-              id: '5'
-            },
-            {
-              type: FlowchartConstants.rightConnectorType,
-              id: '6'
-            }
-          ]
-        },
-        {
-          name: 'Node 4',
-          id: '5',
-          x: 1300,
-          y: 100,
-          color: '#000',
-          borderColor: '#000',
-          connectors: [
-            {
-              type: FlowchartConstants.leftConnectorType,
-              id: '7'
-            },
-            {
-              type: FlowchartConstants.rightConnectorType,
-              id: '8'
+  private createRuleChainModel() {
+    this.nextNodeID = 1;
+    this.nextConnectorID = 1;
+
+    this.selectedObjects.length = 0;
+    this.ruleChainModel.nodes.length = 0;
+    this.ruleChainModel.edges.length = 0;
+
+    this.inputConnectorId = this.nextConnectorID++;
+    this.ruleChainModel.nodes.push(
+      {
+        id: 'rule-chain-node-' + this.nextNodeID++,
+        component: inputNodeComponent,
+        name: '',
+        nodeClass: ruleNodeTypeDescriptors.get(RuleNodeType.INPUT).nodeClass,
+        icon: ruleNodeTypeDescriptors.get(RuleNodeType.INPUT).icon,
+        readonly: true,
+        x: 50,
+        y: 150,
+        connectors: [
+          {
+            type: FlowchartConstants.rightConnectorType,
+            id: this.inputConnectorId + ''
+          },
+        ]
+
+      }
+    );
+    const nodes: FcRuleNode[] = [];
+    this.ruleChainMetaData.nodes.forEach((ruleNode) => {
+      const component = this.ruleChainService.getRuleNodeComponentByClazz(ruleNode.type);
+      const descriptor = ruleNodeTypeDescriptors.get(component.type);
+      let icon = descriptor.icon;
+      let iconUrl = null;
+      if (component.configurationDescriptor.nodeDefinition.icon) {
+        icon = component.configurationDescriptor.nodeDefinition.icon;
+      }
+      if (component.configurationDescriptor.nodeDefinition.iconUrl) {
+        iconUrl = component.configurationDescriptor.nodeDefinition.iconUrl;
+      }
+      const node: FcRuleNode = {
+        id: 'rule-chain-node-' + this.nextNodeID++,
+        ruleNodeId: ruleNode.id,
+        additionalInfo: ruleNode.additionalInfo,
+        configuration: ruleNode.configuration,
+        debugMode: ruleNode.debugMode,
+        x: Math.round(ruleNode.additionalInfo.layoutX),
+        y: Math.round(ruleNode.additionalInfo.layoutY),
+        component,
+        name: ruleNode.name,
+        nodeClass: descriptor.nodeClass,
+        icon,
+        iconUrl,
+        connectors: []
+      };
+      if (component.configurationDescriptor.nodeDefinition.inEnabled) {
+        node.connectors.push(
+          {
+            type: FlowchartConstants.leftConnectorType,
+            id: (this.nextConnectorID++) + ''
+          }
+        );
+      }
+      if (component.configurationDescriptor.nodeDefinition.outEnabled) {
+        node.connectors.push(
+          {
+            type: FlowchartConstants.rightConnectorType,
+            id: (this.nextConnectorID++) + ''
+          }
+        );
+      }
+      nodes.push(node);
+      this.ruleChainModel.nodes.push(node);
+    });
+    if (this.ruleChainMetaData.firstNodeIndex > -1) {
+      const destNode = nodes[this.ruleChainMetaData.firstNodeIndex];
+      if (destNode) {
+        const connectors = destNode.connectors.filter(connector => connector.type === FlowchartConstants.leftConnectorType);
+        if (connectors && connectors.length) {
+          const edge: FcRuleEdge = {
+            source: this.inputConnectorId + '',
+            destination: connectors[0].id
+          };
+          this.ruleChainModel.edges.push(edge);
+        }
+      }
+    }
+    if (this.ruleChainMetaData.connections) {
+      const edgeMap: {[edgeKey: string]: FcRuleEdge} = {};
+      this.ruleChainMetaData.connections.forEach((connection) => {
+        const sourceNode = nodes[connection.fromIndex];
+        const destNode = nodes[connection.toIndex];
+        if (sourceNode && destNode) {
+          const sourceConnectors = sourceNode.connectors.filter(connector => connector.type === FlowchartConstants.rightConnectorType);
+          const destConnectors = destNode.connectors.filter(connector => connector.type === FlowchartConstants.leftConnectorType);
+          if (sourceConnectors && sourceConnectors.length && destConnectors && destConnectors.length) {
+            const sourceId = sourceConnectors[0].id;
+            const destId = destConnectors[0].id;
+            const edgeKey = sourceId + '_' + destId;
+            let edge = edgeMap[edgeKey];
+            if (!edge) {
+              edge = {
+                source: sourceId,
+                destination: destId,
+                label: connection.type,
+                labels: [connection.type]
+              };
+              edgeMap[edgeKey] = edge;
+              this.ruleChainModel.edges.push(edge);
+            } else {
+              edge.label += ' / ' + connection.type;
+              edge.labels.push(connection.type);
             }
-          ]
+          }
         }
-      ]
-    );
-    this.model.edges.push(...
-      [
-        {
-          source: '2',
-          destination: '3',
-          label: 'label1'
-        },
-        {
-          source: '4',
-          destination: '5',
-          label: 'label2'
-        },
-        {
-          source: '6',
-          destination: '7',
-          label: 'label3'
+      });
+    }
+    if (this.ruleChainMetaData.ruleChainConnections) {
+      const ruleChainsMap = this.ruleChainMetaData.targetRuleChainsMap;
+      const ruleChainNodesMap: {[ruleChainNodeId: string]: FcRuleNode} = {};
+      const ruleChainEdgeMap: {[edgeKey: string]: FcRuleEdge} = {};
+      this.ruleChainMetaData.ruleChainConnections.forEach((ruleChainConnection) => {
+        const ruleChain = ruleChainsMap[ruleChainConnection.targetRuleChainId.id];
+        if (ruleChainConnection.additionalInfo && ruleChainConnection.additionalInfo.ruleChainNodeId) {
+          let ruleChainNode = ruleChainNodesMap[ruleChainConnection.additionalInfo.ruleChainNodeId];
+          if (!ruleChainNode) {
+            ruleChainNode = {
+              id: 'rule-chain-node-' + this.nextNodeID++,
+              name: ruleChain.name ? name : 'Unresolved',
+              targetRuleChainId: ruleChain.name ? ruleChainConnection.targetRuleChainId.id : null,
+              error: ruleChain.name ? undefined : this.translate.instant('rulenode.invalid-target-rulechain'),
+              additionalInfo: ruleChainConnection.additionalInfo,
+              x: Math.round(ruleChainConnection.additionalInfo.layoutX),
+              y: Math.round(ruleChainConnection.additionalInfo.layoutY),
+              component: ruleChainNodeComponent,
+              nodeClass: ruleNodeTypeDescriptors.get(RuleNodeType.RULE_CHAIN).nodeClass,
+              icon: ruleNodeTypeDescriptors.get(RuleNodeType.RULE_CHAIN).icon,
+              connectors: [
+                {
+                  type: FlowchartConstants.leftConnectorType,
+                  id: (this.nextConnectorID++) + ''
+                }
+              ]
+            };
+            ruleChainNodesMap[ruleChainConnection.additionalInfo.ruleChainNodeId] = ruleChainNode;
+            this.ruleChainModel.nodes.push(ruleChainNode);
+          }
+          const sourceNode = nodes[ruleChainConnection.fromIndex];
+          if (sourceNode) {
+            const connectors = sourceNode.connectors.filter(connector => connector.type === FlowchartConstants.rightConnectorType);
+            if (connectors && connectors.length) {
+              const sourceId = connectors[0].id;
+              const destId = ruleChainNode.connectors[0].id;
+              const edgeKey = sourceId + '_' + destId;
+              let ruleChainEdge = ruleChainEdgeMap[edgeKey];
+              if (!ruleChainEdge) {
+                ruleChainEdge = {
+                  source: sourceId,
+                  destination: destId,
+                  label: ruleChainConnection.type,
+                  labels: [ruleChainConnection.type]
+                };
+                ruleChainEdgeMap[edgeKey] = ruleChainEdge;
+                this.ruleChainModel.edges.push(ruleChainEdge);
+              } else {
+                ruleChainEdge.label += ' / ' + ruleChainConnection.type;
+                ruleChainEdge.labels.push(ruleChainConnection.type);
+              }
+            }
+          }
         }
-      ]
-    );
+      });
+    }
+    this.isDirtyValue = false;
+  }
+
+  onModelChanged() {
+    console.log('Model changed!');
+    this.isDirtyValue = true;
   }
 
+
 }

+///
+/// Copyright © 2016-2019 The Thingsboard Authors
+///
+/// Licensed under the Apache License, Version 2.0 (the "License");
+/// you may not use this file except in compliance with the License.
+/// You may obtain a copy of the License at
+///
+///     http://www.apache.org/licenses/LICENSE-2.0
+///
+/// Unless required by applicable law or agreed to in writing, software
+/// distributed under the License is distributed on an "AS IS" BASIS,
+/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+/// See the License for the specific language governing permissions and
+/// limitations under the License.
+///
+
+import { FcNode, FcEdge, FcModel } from 'ngx-flowchart/dist/ngx-flowchart';
+import { RuleNodeComponentDescriptor, RuleNodeConfiguration } from '@shared/models/rule-node.models';
+import { RuleNodeId } from '@app/shared/models/id/rule-node-id';
+import { RuleChainId } from '@shared/models/id/rule-chain-id';
+
+export interface FcRuleNodeType extends FcNode {
+  component: RuleNodeComponentDescriptor;
+  nodeClass: string;
+  icon: string;
+  iconUrl?: string;
+}
+
+export interface FcRuleNodeTypeModel extends FcModel {
+  nodes: Array<FcRuleNodeType>;
+}
+
+export interface FcRuleNode extends FcRuleNodeType {
+  ruleNodeId?: RuleNodeId;
+  additionalInfo?: any;
+  configuration?: RuleNodeConfiguration;
+  debugMode?: boolean;
+  targetRuleChainId?: string;
+  error?: string;
+}
+
+export interface FcRuleEdge extends FcEdge {
+  labels?: string[];
+}
+
+export interface FcRuleNodeModel extends FcModel {
+  nodes: Array<FcRuleNode>;
+  edges: Array<FcRuleEdge>;
+}

@@ -26,11 +26,18 @@ import { DashboardUtilsService } from '@core/services/dashboard-utils.service';
 import { Observable } from 'rxjs';
 import { map } from 'rxjs/operators';
 import { BreadCrumbConfig, BreadCrumbLabelFunction } from '@shared/components/breadcrumb';
-import { RuleChain } from '@shared/models/rule-chain.models';
+import {
+  RuleChain,
+  RuleChainMetaData,
+  RuleChainImport,
+  ResolvedRuleChainMetaData
+} from '@shared/models/rule-chain.models';
 import { RuleChainService } from '@core/http/rule-chain.service';
 import { DashboardPageComponent } from '@home/pages/dashboard/dashboard-page.component';
 import { dashboardBreadcumbLabelFunction, DashboardResolver } from '@home/pages/dashboard/dashboard-routing.module';
 import { RuleChainPageComponent } from '@home/pages/rulechain/rulechain-page.component';
+import { RuleNodeComponentDescriptor } from '@shared/models/rule-node.models';
+import { ConfirmOnExitGuard } from '@core/guards/confirm-on-exit.guard';
 
 
 @Injectable()
@@ -45,6 +52,29 @@ export class RuleChainResolver implements Resolve<RuleChain> {
   }
 }
 
+@Injectable()
+export class ResolvedRuleChainMetaDataResolver implements Resolve<ResolvedRuleChainMetaData> {
+
+  constructor(private ruleChainService: RuleChainService) {
+  }
+
+  resolve(route: ActivatedRouteSnapshot): Observable<ResolvedRuleChainMetaData> {
+    const ruleChainId = route.params.ruleChainId;
+    return this.ruleChainService.getResolvedRuleChainMetadata(ruleChainId);
+  }
+}
+
+@Injectable()
+export class RuleNodeComponentsResolver implements Resolve<Array<RuleNodeComponentDescriptor>> {
+
+  constructor(private ruleChainService: RuleChainService) {
+  }
+
+  resolve(route: ActivatedRouteSnapshot): Observable<Array<RuleNodeComponentDescriptor>> {
+    return this.ruleChainService.getRuleNodeComponents();
+  }
+}
+
 export const ruleChainBreadcumbLabelFunction: BreadCrumbLabelFunction = ((route, translate, component) => {
   let label: string = component.ruleChain.name;
   if (component.ruleChain.root) {
@@ -53,6 +83,10 @@ export const ruleChainBreadcumbLabelFunction: BreadCrumbLabelFunction = ((route,
   return label;
 });
 
+export const importRuleChainBreadcumbLabelFunction: BreadCrumbLabelFunction = ((route, translate, component) => {
+  return `${translate.instant('rulechain.import')}: ${component.ruleChain.name}`;
+});
+
 const routes: Routes = [
   {
     path: 'ruleChains',
@@ -77,6 +111,7 @@ const routes: Routes = [
       {
         path: ':ruleChainId',
         component: RuleChainPageComponent,
+        canDeactivate: [ConfirmOnExitGuard],
         data: {
           breadcrumb: {
             labelFunction: ruleChainBreadcumbLabelFunction,
@@ -84,10 +119,31 @@ const routes: Routes = [
           } as BreadCrumbConfig,
           auth: [Authority.TENANT_ADMIN],
           title: 'rulechain.rulechain',
-          widgetEditMode: false
+          import: false
         },
         resolve: {
-          ruleChain: RuleChainResolver
+          ruleChain: RuleChainResolver,
+          ruleChainMetaData: ResolvedRuleChainMetaDataResolver,
+          ruleNodeComponents: RuleNodeComponentsResolver
+        }
+      },
+      {
+        path: 'ruleChain/import',
+        component: RuleChainPageComponent,
+        canDeactivate: [ConfirmOnExitGuard],
+        data: {
+          breadcrumb: {
+            labelFunction: importRuleChainBreadcumbLabelFunction,
+            icon: 'settings_ethernet'
+          } as BreadCrumbConfig,
+          auth: [Authority.TENANT_ADMIN],
+          title: 'rulechain.rulechain',
+          import: true
+        },
+        resolve: {
+          ruleChain: 'importRuleChain',
+          ruleChainMetaData: 'importRuleChainMetadata',
+          ruleNodeComponents: RuleNodeComponentsResolver
         }
       }
     ]
@@ -99,7 +155,23 @@ const routes: Routes = [
   exports: [RouterModule],
   providers: [
     RuleChainsTableConfigResolver,
-    RuleChainResolver
+    RuleChainResolver,
+    ResolvedRuleChainMetaDataResolver,
+    RuleNodeComponentsResolver,
+    {
+      provide: 'importRuleChain',
+      useValue: (route: ActivatedRouteSnapshot) => {
+        const ruleChainImport: RuleChainImport = route.params.ruleChainImport;
+        return ruleChainImport.ruleChain;
+      }
+    },
+    {
+      provide: 'importRuleChainMetadata',
+      useValue: (route: ActivatedRouteSnapshot) => {
+        const ruleChainImport: RuleChainImport = route.params.ruleChainImport;
+        return ruleChainImport.metadata;
+      }
+    }
   ]
 })
 export class RuleChainRoutingModule { }

+///
+/// Copyright © 2016-2019 The Thingsboard Authors
+///
+/// Licensed under the Apache License, Version 2.0 (the "License");
+/// you may not use this file except in compliance with the License.
+/// You may obtain a copy of the License at
+///
+///     http://www.apache.org/licenses/LICENSE-2.0
+///
+/// Unless required by applicable law or agreed to in writing, software
+/// distributed under the License is distributed on an "AS IS" BASIS,
+/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+/// See the License for the specific language governing permissions and
+/// limitations under the License.
+///
+
+import { RuleNodeType } from '@shared/models/rule-node.models';
+
+export enum ComponentType {
+  ENRICHMENT = 'ENRICHMENT',
+  FILTER = 'FILTER',
+  TRANSFORMATION = 'TRANSFORMATION',
+  ACTION = 'ACTION',
+  EXTERNAL = 'EXTERNAL'
+}
+
+export enum ComponentScope {
+  SYSTEM = 'SYSTEM',
+  TENANT = 'TENANT'
+}
+
+export interface ComponentDescriptor {
+  type: ComponentType | RuleNodeType;
+  scope?: ComponentScope;
+  name: string;
+  clazz: string;
+  configurationDescriptor?: any;
+  actions?: string;
+}

@@ -14,10 +14,12 @@
 /// limitations under the License.
 ///
 
-import {BaseData} from '@shared/models/base-data';
-import {TenantId} from '@shared/models/id/tenant-id';
-import {RuleChainId} from '@shared/models/id/rule-chain-id';
-import {RuleNodeId} from '@shared/models/id/rule-node-id';
+import { BaseData } from '@shared/models/base-data';
+import { TenantId } from '@shared/models/id/tenant-id';
+import { RuleChainId } from '@shared/models/id/rule-chain-id';
+import { RuleNodeId } from '@shared/models/id/rule-node-id';
+import { RuleNode, RuleNodeComponentDescriptor, RuleNodeType } from '@shared/models/rule-node.models';
+import { ComponentType } from '@shared/models/component-descriptor.models';
 
 export interface RuleChain extends BaseData<RuleChainId> {
   tenantId: TenantId;
@@ -28,3 +30,82 @@ export interface RuleChain extends BaseData<RuleChainId> {
   configuration?: any;
   additionalInfo?: any;
 }
+
+export interface RuleChainMetaData {
+  ruleChainId: RuleChainId;
+  firstNodeIndex: number;
+  nodes: Array<RuleNode>;
+  connections: Array<NodeConnectionInfo>;
+  ruleChainConnections: Array<RuleChainConnectionInfo>;
+}
+
+export interface ResolvedRuleChainMetaData extends RuleChainMetaData {
+  targetRuleChainsMap: {[ruleChainId: string]: RuleChain};
+}
+
+export interface RuleChainImport {
+  ruleChain: RuleChain;
+  metadata: ResolvedRuleChainMetaData;
+}
+
+export interface NodeConnectionInfo {
+  fromIndex: number;
+  toIndex: number;
+  type: string;
+}
+
+export interface RuleChainConnectionInfo {
+  fromIndex: number;
+  targetRuleChainId: RuleChainId;
+  additionalInfo: any;
+  type: string;
+}
+
+export const ruleNodeTypeComponentTypes: ComponentType[] =
+  [
+    ComponentType.FILTER,
+    ComponentType.ENRICHMENT,
+    ComponentType.TRANSFORMATION,
+    ComponentType.ACTION,
+    ComponentType.EXTERNAL
+  ];
+
+export const ruleChainNodeComponent: RuleNodeComponentDescriptor = {
+  type: RuleNodeType.RULE_CHAIN,
+  name: 'rule chain',
+  clazz: 'tb.internal.RuleChain',
+  configurationDescriptor: {
+    nodeDefinition: {
+      description: '',
+      details: 'Forwards incoming messages to specified Rule Chain',
+      inEnabled: true,
+      outEnabled: false,
+      relationTypes: [],
+      customRelations: false,
+      defaultConfiguration: {}
+    }
+  }
+};
+
+export const unknownNodeComponent: RuleNodeComponentDescriptor = {
+  type: RuleNodeType.UNKNOWN,
+  name: 'unknown',
+  clazz: 'tb.internal.Unknown',
+  configurationDescriptor: {
+    nodeDefinition: {
+      description: '',
+      details: '',
+      inEnabled: true,
+      outEnabled: true,
+      relationTypes: [],
+      customRelations: false,
+      defaultConfiguration: {}
+    }
+  }
+};
+
+export const inputNodeComponent: RuleNodeComponentDescriptor = {
+  type: RuleNodeType.INPUT,
+  name: 'Input',
+  clazz: 'tb.internal.Input'
+};

@@ -20,6 +20,8 @@ import {TenantId} from '@shared/models/id/tenant-id';
 import {CustomerId} from '@shared/models/id/customer-id';
 import {RuleChainId} from '@shared/models/id/rule-chain-id';
 import {RuleNodeId} from '@shared/models/id/rule-node-id';
+import { ComponentDescriptor, ComponentType } from '@shared/models/component-descriptor.models';
+import { EntityType, EntityTypeResource } from '@shared/models/entity-type.models';
 
 export enum MsgDataType {
   JSON = 'JSON',
@@ -28,7 +30,7 @@ export enum MsgDataType {
 }
 
 export interface RuleNodeConfiguration {
-  todo: Array<any>;
+  [key: string]: any;
   // TODO:
 }
 
@@ -40,3 +42,130 @@ export interface RuleNode extends BaseData<RuleNodeId> {
   configuration: RuleNodeConfiguration;
   additionalInfo?: any;
 }
+
+export interface RuleNodeConfigurationDescriptor {
+  nodeDefinition: {
+    description: string;
+    details: string;
+    inEnabled: boolean;
+    outEnabled: boolean;
+    relationTypes: string[];
+    customRelations: boolean;
+    defaultConfiguration: any;
+    icon?: string;
+    iconUrl?: string;
+    uiResources?: string[];
+    uiResourceLoadError?: string;
+  };
+}
+
+export enum RuleNodeType {
+  FILTER = 'FILTER',
+  ENRICHMENT = 'ENRICHMENT',
+  TRANSFORMATION = 'TRANSFORMATION',
+  ACTION = 'ACTION',
+  EXTERNAL = 'EXTERNAL',
+  RULE_CHAIN = 'RULE_CHAIN',
+  UNKNOWN = 'UNKNOWN',
+  INPUT = 'INPUT'
+}
+
+export interface RuleNodeTypeDescriptor {
+  value: RuleNodeType;
+  name: string;
+  details: string;
+  nodeClass: string;
+  icon: string;
+  special?: boolean;
+}
+
+export const ruleNodeTypeDescriptors = new Map<RuleNodeType, RuleNodeTypeDescriptor>(
+  [
+    [
+      RuleNodeType.FILTER,
+      {
+        value: RuleNodeType.FILTER,
+        name: 'rulenode.type-filter',
+        details: 'rulenode.type-filter-details',
+        nodeClass: 'tb-filter-type',
+        icon: 'filter_list'
+      }
+    ],
+    [
+      RuleNodeType.ENRICHMENT,
+      {
+        value: RuleNodeType.ENRICHMENT,
+        name: 'rulenode.type-enrichment',
+        details: 'rulenode.type-enrichment-details',
+        nodeClass: 'tb-enrichment-type',
+        icon: 'playlist_add'
+      }
+    ],
+    [
+      RuleNodeType.TRANSFORMATION,
+      {
+        value: RuleNodeType.TRANSFORMATION,
+        name: 'rulenode.type-transformation',
+        details: 'rulenode.type-transformation-details',
+        nodeClass: 'tb-transformation-type',
+        icon: 'transform'
+      }
+    ],
+    [
+      RuleNodeType.ACTION,
+      {
+        value: RuleNodeType.ACTION,
+        name: 'rulenode.type-action',
+        details: 'rulenode.type-action-details',
+        nodeClass: 'tb-action-type',
+        icon: 'flash_on'
+      }
+    ],
+    [
+      RuleNodeType.EXTERNAL,
+      {
+        value: RuleNodeType.EXTERNAL,
+        name: 'rulenode.type-external',
+        details: 'rulenode.type-external-details',
+        nodeClass: 'tb-external-type',
+        icon: 'cloud_upload'
+      }
+    ],
+    [
+      RuleNodeType.RULE_CHAIN,
+      {
+        value: RuleNodeType.RULE_CHAIN,
+        name: 'rulenode.type-rule-chain',
+        details: 'rulenode.type-rule-chain-details',
+        nodeClass: 'tb-rule-chain-type',
+        icon: 'settings_ethernet'
+      }
+    ],
+    [
+      RuleNodeType.INPUT,
+      {
+        value: RuleNodeType.INPUT,
+        name: 'rulenode.type-input',
+        details: 'rulenode.type-input-details',
+        nodeClass: 'tb-input-type',
+        icon: 'input',
+        special: true
+      }
+    ],
+    [
+      RuleNodeType.UNKNOWN,
+      {
+        value: RuleNodeType.UNKNOWN,
+        name: 'rulenode.type-unknown',
+        details: 'rulenode.type-unknown-details',
+        nodeClass: 'tb-unknown-type',
+        icon: 'help_outline'
+      }
+    ]
+  ]
+);
+
+export interface RuleNodeComponentDescriptor extends ComponentDescriptor {
+  type: RuleNodeType;
+  configurationDescriptor?: RuleNodeConfigurationDescriptor;
+}