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/*
* Copyright 2017, OpenCensus 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.
*/
package io.opencensus.implcore.stats;
import static com.google.common.base.Preconditions.checkNotNull;
import io.opencensus.common.Clock;
import io.opencensus.implcore.internal.CurrentState;
import io.opencensus.implcore.internal.CurrentState.State;
import io.opencensus.implcore.internal.EventQueue;
import io.opencensus.metrics.Metric;
import io.opencensus.stats.View;
import io.opencensus.stats.ViewData;
import io.opencensus.tags.TagContext;
import java.util.Collection;
import java.util.Set;
import javax.annotation.Nullable;
/** Object that stores all views and stats. */
final class StatsManager {
private final EventQueue queue;
// clock used throughout the stats implementation
private final Clock clock;
private final CurrentState state;
private final MeasureToViewMap measureToViewMap = new MeasureToViewMap();
StatsManager(EventQueue queue, Clock clock, CurrentState state) {
checkNotNull(queue, "EventQueue");
checkNotNull(clock, "Clock");
checkNotNull(state, "state");
this.queue = queue;
this.clock = clock;
this.state = state;
}
void registerView(View view) {
measureToViewMap.registerView(view, clock);
}
@Nullable
ViewData getView(View.Name viewName) {
return measureToViewMap.getView(viewName, clock, state.getInternal());
}
Set<View> getExportedViews() {
return measureToViewMap.getExportedViews();
}
void record(TagContext tags, MeasureMapInternal measurementValues) {
// TODO(songya): consider exposing No-op MeasureMap and use it when stats state is DISABLED, so
// that we don't need to create actual MeasureMapImpl.
if (state.getInternal() == State.ENABLED) {
queue.enqueue(new StatsEvent(this, tags, measurementValues));
}
}
Collection<Metric> getMetrics() {
return measureToViewMap.getMetrics(clock, state.getInternal());
}
void clearStats() {
measureToViewMap.clearStats();
}
void resumeStatsCollection() {
measureToViewMap.resumeStatsCollection(clock.now());
}
// An EventQueue entry that records the stats from one call to StatsManager.record(...).
private static final class StatsEvent implements EventQueue.Entry {
private final TagContext tags;
private final MeasureMapInternal stats;
private final StatsManager statsManager;
StatsEvent(StatsManager statsManager, TagContext tags, MeasureMapInternal stats) {
this.statsManager = statsManager;
this.tags = tags;
this.stats = stats;
}
@Override
public void process() {
// Add Timestamp to value after it went through the DisruptorQueue.
statsManager.measureToViewMap.record(tags, stats, statsManager.clock.now());
}
}
}
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