Add Google Charts to Observatory and use it in allocation profiler

runtime/bin/vmservice/client/lib/src/observatory/chart.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 observatory;
+
+// Static utility methods hiding dart:js interop calls.
+class Chart extends Observable {

[turnidge, 2014/01/28 18:28:08]

See my other comment.  I am suggesting getting away from using the static
methods here and making this class own its options, table, and chart objects.

+  static var _gviz;
+  static get gviz {
+    return _gviz;
+  }
+
+  static Future initOnce() {
+    Completer c = new Completer();
+    context['google'].callMethod('load',
+        ['visualization', '1', new JsObject.jsify({
+          'packages': ['corechart', 'table'],
+          'callback': new JsFunction.withThis(c.complete)
+    })]);
+    return c.future.then(_initOnceOnComplete);
+  }
+
+  static _initOnceOnComplete(_) {
+    Logger.root.info('Google Charts API loaded');
+    _gviz = context['google']['visualization'];
+    assert(_gviz != null);
+    return _gviz;
+  }
+
+  /// Create a Google Chart of [chartType]. e.g. 'Table', 'BarChart', the
+  /// chart is rendered inside [element].
+  static createChart(String chartType, Element element) {
+    return new JsObject(gviz[chartType], [element]);
+  }
+
+  /// Create a new DataTable.
+  static createDataTable() {
+    return new JsObject(gviz['DataTable']);
+  }
+
+  /// Add a column to [dataTable] with [type] and [label].
+  static addColumn(var dataTable, String type, String label) {
+    dataTable.callMethod('addColumn', [type, label]);
+  }
+
+  static addAnnotationColumn(var dataTable, String type, String label) {
+    dataTable.callMethod('addColumn', [new JsObject.jsify({
+      'type': type,
+      'label': label,
+      'role': 'annotation',
+    })]);
+  }
+
+  static addIntervalColumn(var dataTable, String type, String label) {
+    dataTable.callMethod('addColumn', [new JsObject.jsify({
+      'type': type,
+      'label': label,
+      'role': 'interval',
+    })]);
+  }
+
+  static clearRows(var dataTable) {
+    var rows = dataTable.callMethod('getNumberOfRows');
+    dataTable.callMethod('removeRows', [0, rows]);
+  }
+
+  static addRow(var dataTable, List row) {
+    dataTable.callMethod('addRow', [new JsArray.from(row)]);
+  }
+
+  static bool hasRows(var dataTable) {
+    var rows = dataTable.callMethod('getNumberOfRows');
+    return rows > 0;
+  }
+
+  static int numRows(var dataTable) {
+    return dataTable.callMethod('getNumberOfRows');
+  }
+
+  static bool hasColumns(var dataTable) {
+    var cols = dataTable.callMethod('getNumberOfColumns');
+    return cols > 0;
+  }
+
+  static int numColumns(var dataTable) {
+    return dataTable.callMethod('getNumberOfColumns');
+  }
+
+  static refreshTableChartDrawOptions(var chart, var options) {
+    var props = chart.callMethod('getSortInfo');
+    if (props != null) {
+      options['sortColumn'] = props['column'];
+      options['sortAscending'] = props['ascending'];
+    }
+  }
+
+  static draw(var chart, var table, var options) {
+    chart.callMethod('draw', [table, options]);
+  }
+}