Rework how ServiceObjects are created and cached in Observatory.

runtime/bin/vmservice/client/lib/src/service/service.dart

-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-part of service;
-
-/// Recursively upgrades all [ServiceObject]s inside [collection] which must
-/// be an [ObservableMap] or an [ObservableList]. Upgraded elements will be
-/// associated with [vm] and [isolate].
-void upgradeCollection(collection, VM vm, Isolate isolate) {
-  if (collection is ObservableMap) {
-    _upgradeObservableMap(collection, vm, isolate);
-  } else if (collection is ObservableList) {
-    _upgradeObservableList(collection, vm, isolate);
-  }
-}
-
-void _upgradeObservableMap(ObservableMap map, VM vm, Isolate isolate) {
-  map.forEach((k, v) {
-    if ((v is ObservableMap) && ServiceObject.isServiceMap(v)) {
-      map[k] = v = _upgradeToServiceObject(vm, isolate, v);
-    } else if (v is ObservableList) {
-      _upgradeObservableList(v, vm, isolate);
-    } else if (v is ObservableMap) {
-      _upgradeObservableMap(v, vm, isolate);
-    }
-  });
-}
-
-void _upgradeObservableList(ObservableList list, VM vm, Isolate isolate) {
-  for (var i = 0; i < list.length; i++) {
-    var v = list[i];
-    if ((v is ObservableMap) && ServiceObject.isServiceMap(v)) {
-      list[i] = _upgradeToServiceObject(vm, isolate, v);
-    } else if (v is ObservableList) {
-      _upgradeObservableList(v, vm, isolate);
-    } else if (v is ObservableMap) {
-      _upgradeObservableMap(v, vm, isolate);
-    }
-  }
-}
-
-/// Upgrades response ([m]) from [vm] and [isolate] to a [ServiceObject].
-/// This acts like a factory which consumes an ObservableMap and returns
-/// a fully upgraded ServiceObject.
-ServiceObject _upgradeToServiceObject(VM vm, Isolate isolate, ObservableMap m) {
-  if (m == null) {
-    return null;
-  }
-  if (!ServiceObject.isServiceMap(m)) {
-    Logger.root.severe("Malformed service object: $m");
-  }
-  assert(ServiceObject.isServiceMap(m));
-  var type = ServiceObject.stripRef(m['type']);
-  switch (type) {
-    case 'Error':
-      if (isolate != null) {
-        return new ServiceError.fromMap(isolate, m);
-      } else {
-        return new ServiceError.fromMap(vm, m);
-      }
-      break;
-    case 'Script':
-      return isolate.scripts.putIfAbsent(m);
-    case 'Code':
-      return isolate.codes.putIfAbsent(m);
-    case 'Isolate':
-      return vm.isolates.getIsolateFromMap(m);
-    case 'Class':
-      return isolate.classes.putIfAbsent(m);
-    case 'Function':
-      return isolate.functions.putIfAbsent(m);
-    case 'VM':
-      return vm.update(m);
-  }
-  return new ServiceMap.fromMap(isolate, m);
-}