Converted Observatory metrics-page element

runtime/observatory/lib/src/repositories/metric.dart

+// Copyright (c) 2016, 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 repositories;
+
+class Metric implements M.Metric {
+  final String id;
+  String get name => internal.name;
+  String get description => internal.description;
+  final internal;
+
+  Metric(this.id, this.internal);
+}
+
+class MetricSample implements M.MetricSample {
+  final double value;
+  final DateTime time = new DateTime.now();
+  MetricSample(this.value);
+}
+
+class MetricRepository implements M.MetricRepository {
+  final Map<S.Isolate, Map<Metric, List<M.MetricSample>>> _samples
+    = <S.Isolate, Map<Metric, List<M.MetricSample>>>{};
+  final Map<S.Isolate, Map<Metric, int>> _rates
+    = <S.Isolate, Map<Metric, int>>{};
+  final Map<S.Isolate, Map<Metric, int>> _sizes
+    = <S.Isolate, Map<Metric, int>>{};
+  Timer _timer;
+  int count = 0;
+
+  Future<Iterable<Metric>> list(M.IsolateRef i) async{
+    S.Isolate isolate = i as S.Isolate;
+    assert(isolate != null);
+    if (_samples.containsKey(isolate)) {
+      return _samples[isolate].keys;
+    }
+    return const [];
+  }
+
+  Future startSampling(M.IsolateRef i) async {
+    S.Isolate isolate = i as S.Isolate;
+    assert(isolate != null);
+    if (!_samples.containsKey(isolate)) {
+      await isolate.refreshMetrics();
+      final samples = _samples[isolate] = <Metric, List<M.MetricSample>>{};
+      final rates = _rates[isolate] = <Metric, int>{};
+      final sizes = _sizes[isolate] = <Metric, int>{};
+      final metrics = []
+        ..addAll(isolate.dartMetrics.keys.map((name) =>
+            new Metric(name, isolate.dartMetrics[name])).toList())
+        ..addAll(isolate.nativeMetrics.keys.map((name) =>
+            new Metric(name, isolate.nativeMetrics[name])).toList());
+      for (final metric in metrics) {
+        samples[metric] = [new MetricSample(metric.internal.value)];
+        rates[metric] = _rateToInteger(M.MetricSamplingRate.off);
+        sizes[metric] = _sizeToInteger(M.MetricBufferSize.n100samples);
+      }
+      if (_samples.length == 1) {
+        count = 0;
+        _timer = new Timer.periodic(new Duration(milliseconds: 100), _update);
+      }
+    }
+  }
+
+  Future stopSampling(M.IsolateRef isolate) async {
+    if (_samples.containsKey(isolate)) {
+      _samples.remove(isolate);
+      _rates.remove(isolate);
+      _sizes.remove(isolate);
+      if (_samples.isEmpty) {
+        _timer.cancel();
+      }
+    }
+  }
+
+  M.MetricSamplingRate getSamplingRate(M.IsolateRef i, M.Metric m) {
+    if (_rates.containsKey(i)) {
+      final metrics = _rates[i];
+      if (metrics.containsKey(m)) {
+        switch (metrics[m]) {
+          case 0: return M.MetricSamplingRate.off;
+          case 1: return M.MetricSamplingRate.e100ms;
+          case 10: return M.MetricSamplingRate.e1s;
+          case 20: return M.MetricSamplingRate.e2s;
+          case 40: return M.MetricSamplingRate.e4s;
+          case 80: return M.MetricSamplingRate.e8s;
+        }
+      }
+    }
+    throw new Exception('Sampling for isolate ${i.id} is not started');
+  }
+
+  void setSamplingRate(M.IsolateRef i, M.Metric m, M.MetricSamplingRate r) {
+    if (_rates.containsKey(i)) {
+      final metrics = _rates[i];
+      if (metrics.containsKey(m)) {
+        metrics[m] = _rateToInteger(r);
+      }
+    } else {
+      throw new Exception('Sampling for isolate ${i.id} is not started');
+    }
+  }
+
+  M.MetricBufferSize getBufferSize(M.IsolateRef i, M.Metric m) {
+    if (_sizes.containsKey(i)) {
+      final metrics = _sizes[i];
+      if (metrics.containsKey(m)) {
+        switch (metrics[m]) {
+          case 10: return M.MetricBufferSize.n10samples;
+          case 100: return M.MetricBufferSize.n100samples;
+          case 1000: return M.MetricBufferSize.n1000samples;
+        }
+      }
+    }
+    throw new Exception('Sampling for isolate ${i.id} is not started');
+  }
+
+  void setBufferSize(M.IsolateRef i, M.Metric m, M.MetricBufferSize s) {
+    if (_sizes.containsKey(i)) {
+      final metrics = _sizes[i];
+      if (metrics.containsKey(m)) {
+        metrics[m] = _sizeToInteger(s);
+      }
+    } else {
+      throw new Exception('Sampling for isolate ${i.id} is not started');
+    }
+  }
+
+  static int _rateToInteger(M.MetricSamplingRate r) {
+    switch (r) {
+      case M.MetricSamplingRate.off: return 0;
+      case M.MetricSamplingRate.e100ms: return 1;
+      case M.MetricSamplingRate.e1s: return 10;
+      case M.MetricSamplingRate.e2s: return 20;
+      case M.MetricSamplingRate.e4s: return 40;
+      case M.MetricSamplingRate.e8s: return 80;
+    }
+    throw new Exception('Unknown MetricSamplingRate ($r)');
+  }
+
+  static int _sizeToInteger(M.MetricBufferSize s) {
+    switch (s) {
+      case M.MetricBufferSize.n10samples: return 10;
+      case M.MetricBufferSize.n100samples: return 100;
+      case M.MetricBufferSize.n1000samples: return 1000;
+    }
+    throw new Exception('Unknown MetricBufferSize ($s)');
+  }
+
+  Iterable<M.MetricSample> getSamples(M.IsolateRef i, M.Metric m) {
+    if (_samples.containsKey(i)) {
+      final metrics = _samples[i];
+      if (metrics.containsKey(m)) {
+        return metrics[m];
+      }
+    }
+    return null;
+  }
+
+  double getMinValue(M.IsolateRef i, M.Metric m) {
+    Metric metric = m as Metric;
+    assert(metric != null);
+    return metric.internal.min;
+  }
+
+  double getMaxValue(M.IsolateRef i, M.Metric m) {
+    Metric metric = m as Metric;
+    assert(metric != null);
+    return metric.internal.max;
+  }
+
+  void _update(_) {
+    for (final isolate in _rates.keys) {
+      final metrics = _rates[isolate];
+      for (final metric in metrics.keys) {
+        final rate = metrics[metric];
+        if (rate != 0 && count % rate == 0) {
+          final size = _sizes[isolate][metric];
+          final samples = _samples[isolate][metric];
+          metric.internal.reload().then((m) {
+            if (samples.length >= size) {
+              samples.removeRange(0, samples.length - size + 1);
+            }
+            samples.add(new MetricSample(m.value));
+          });
+        }
+      }
+    }
+    ++count;
+  }
+}