implement extension mechanism, all engine are registered through extensions now

web/app/cad/craft/enginesPlugin.js

@@ -1,58 +0,0 @@
-import {STORAGE_GLOBAL_PREFIX} from '../projectPlugin';
-
-const ENGINES_STORAGE_PREFIX = `${STORAGE_GLOBAL_PREFIX}.CraftEngines`;
-
-let engines = [];
-
-export function activate({services}) {
-  let enginesStr = services.storage.get(ENGINES_STORAGE_PREFIX);
-  if (enginesStr) {
-    engines = JSON.parse(enginesStr);
-  }
-  
-  function registerEngine(id, url){
-    engines.push({id, url});
-    services.storage.set(ENGINES_STORAGE_PREFIX, JSON.stringify(engines));
-    startEngine(engines[engines.length - 1]);
-  }
-
-  function engineReady(id, handler) {
-    let engine = engines.find(e => e.id === id);
-    if (!engine) {
-      console.warn(`engine "${id}" not registered`);
-    } else {
-      engine.handler = handler;
-      console.info(`engine "${id}" is ready`);
-    }
-    services.lifecycle.loadProjectRequest();
-  }
-  
-  function allEnginesReady() {
-    for (let e of engines) {
-      if (e.handler === NO_OP_HANDLER) {
-        return false;
-      }
-    }
-    return true;
-  }
-  
-  services.craftEngines = {
-    registerEngine,
-    getRegisteredEngines: () => engines,
-    engineReady,
-    allEnginesReady
-  };
-
-  engines.forEach(e => e.handler = NO_OP_HANDLER);
-  engines.forEach(startEngine);
-}
-
-function startEngine({id, url}) {
-  console.info(`starting engine "${id}"...`);
-
-  let engineScript = document.createElement('script');
-  engineScript.setAttribute('src', url);
-  document.head.appendChild(engineScript);
-}
-
-const NO_OP_HANDLER = () => null;

web/app/cad/craft/extensionsPlugin.js

@@ -0,0 +1,66 @@
+import {STORAGE_GLOBAL_PREFIX} from '../projectPlugin';
+
+const EXTENSIONS_STORAGE_PREFIX = `${STORAGE_GLOBAL_PREFIX}.Extensions`;
+
+let extensions = [];
+
+export function activate(ctx) {
+  let {services} = ctx;
+  let extensionsStr = services.storage.get(EXTENSIONS_STORAGE_PREFIX);
+  if (extensionsStr) {
+    extensions = JSON.parse(extensionsStr);
+  }
+  
+  function registerExtension(id, url){
+    extensions.push({id, url});
+    services.storage.set(EXTENSIONS_STORAGE_PREFIX, JSON.stringify(extensions));
+    loadExtension(extensions[extensions.length - 1]);
+  }
+
+  function extensionReady(id, activate) {
+    let extension = extensions.find(e => e.id === id);
+    if (!extension) {
+      console.warn(`extension "${id}" not registered`);
+    } else {
+      extension.activate = activate;
+      console.info(`extension "${id}" is ready`);
+    }
+    services.lifecycle.loadProjectRequest();
+  }
+  
+  function allExtensionsReady() {
+    for (let e of extensions) {
+      if (e.activate === NO_OP) {
+        return false;
+      }
+    }
+    return true;
+  }
+  
+  function activateAllExtensions() {
+    for (let e of extensions) {
+      e.activate(ctx);
+    }
+  }
+  
+  services.extension = {
+    registerExtension,
+    allExtensions: extensions,
+    extensionReady,
+    allExtensionsReady,
+    activateAllExtensions
+  };
+
+  extensions.forEach(e => e.activate = NO_OP);
+  extensions.forEach(loadExtension);
+}
+
+function loadExtension({id, url}) {
+  console.info(`starting extension "${id}"...`);
+
+  let extensionScript = document.createElement('script');
+  extensionScript.setAttribute('src', url);
+  document.head.appendChild(extensionScript);
+}
+
+const NO_OP = () => null;

web/app/cad/craft/operationPlugin.js

@@ -46,18 +46,21 @@ export function activate(context) {
     return op;
   }
 
+  let handlers = [];
+
+  function runOperation(request, descriptor, services) {
+    for (let handler of handlers) {
+      let result = handler(descriptor.id, request, services);
+      if (result) {
+        return result;
+      }
+    }
+    return descriptor.run(request, services);
+  }
+  
   services.operation = {
     registerOperations,
-    get
+    get,
+    handlers
   };
 }
-
-function runOperation(request, descriptor, services) {
-  for (let engine of services.craftEngines.getRegisteredEngines()) {
-    let result = engine.handler(descriptor.id, request, services);
-    if (result) {
-      return result;
-    }
-  }
-  return descriptor.run(request, services);
-}

web/app/cad/init/lifecyclePlugin.js

@@ -1,4 +1,5 @@
 import {state} from '../../../../modules/lstream';
+import context from '../../../../modules/context';
 
 export function activate({streams, services}) {
   const startTime = performance.now();
@@ -10,8 +11,9 @@ export function activate({streams, services}) {
     loadProjectRequest: () => {
       if (streams.lifecycle.appReady.value && 
         !streams.lifecycle.projectLoaded.value && 
-        services.craftEngines.allEnginesReady()) {
+        services.extension.allExtensionsReady()) {
         
+        services.extension.activateAllExtensions();
         services.project.load();
         streams.lifecycle.projectLoaded.value = true;
         const onLoadTime = performance.now();

web/app/cad/init/startApplication.js

@@ -12,7 +12,7 @@ import * as KeyboardPlugin from '../keyboard/keyboardPlugin';
 import * as WizardPlugin from '../craft/wizard/wizardPlugin';
 import * as PreviewPlugin from '../preview/previewPlugin';
 import * as OperationPlugin from '../craft/operationPlugin';
-import * as CraftEnginesPlugin from '../craft/enginesPlugin';
+import * as ExtensionsPlugin from '../craft/extensionsPlugin';
 import * as CadRegistryPlugin from '../craft/cadRegistryPlugin';
 import * as CraftPlugin from '../craft/craftPlugin';
 import * as CraftUiPlugin from '../craft/craftUiPlugin';
@@ -41,7 +41,7 @@ export default function startApplication(callback) {
     UiEntryPointsPlugin,
     MenuPlugin,
     KeyboardPlugin,
-    CraftEnginesPlugin,
+    ExtensionsPlugin,
     OperationPlugin,
     CraftPlugin,
     WizardPlugin,