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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 com.google.common.collect.HashMultimap;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimap;
import com.google.common.collect.Sets;
import io.opencensus.common.Clock;
import io.opencensus.common.Function;
import io.opencensus.common.Functions;
import io.opencensus.common.Timestamp;
import io.opencensus.stats.Measure;
import io.opencensus.stats.Measurement;
import io.opencensus.stats.Measurement.MeasurementDouble;
import io.opencensus.stats.Measurement.MeasurementLong;
import io.opencensus.stats.StatsCollectionState;
import io.opencensus.stats.View;
import io.opencensus.stats.View.AggregationWindow;
import io.opencensus.stats.ViewData;
import io.opencensus.tags.TagContext;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import javax.annotation.concurrent.GuardedBy;
/*>>>
import org.checkerframework.checker.nullness.qual.Nullable;
*/
/** A class that stores a singleton map from {@code MeasureName}s to {@link MutableViewData}s. */
final class MeasureToViewMap {
/*
* A synchronized singleton map that stores the one-to-many mapping from Measures
* to MutableViewDatas.
*/
@GuardedBy("this")
private final Multimap<String, MutableViewData> mutableMap =
HashMultimap.<String, MutableViewData>create();
@GuardedBy("this")
private final Map<View.Name, View> registeredViews = new HashMap<View.Name, View>();
// TODO(songya): consider adding a Measure.Name class
@GuardedBy("this")
private final Map<String, Measure> registeredMeasures = Maps.newHashMap();
// Cached set of exported views. It must be set to null whenever a view is registered or
// unregistered.
@javax.annotation.Nullable private volatile Set<View> exportedViews;
/** Returns a {@link ViewData} corresponding to the given {@link View.Name}. */
@javax.annotation.Nullable
synchronized ViewData getView(View.Name viewName, Clock clock, StatsCollectionState state) {
MutableViewData view = getMutableViewData(viewName);
return view == null ? null : view.toViewData(clock.now(), state);
}
Set<View> getExportedViews() {
Set<View> views = exportedViews;
if (views == null) {
synchronized (this) {
exportedViews = views = filterExportedViews(registeredViews.values());
}
}
return views;
}
// Returns the subset of the given views that should be exported
private static Set<View> filterExportedViews(Collection<View> allViews) {
Set<View> views = Sets.newHashSet();
for (View view : allViews) {
if (view.getWindow() instanceof AggregationWindow.Cumulative) {
views.add(view);
}
}
return Collections.unmodifiableSet(views);
}
/** Enable stats collection for the given {@link View}. */
synchronized void registerView(View view, Clock clock) {
exportedViews = null;
View existing = registeredViews.get(view.getName());
if (existing != null) {
if (existing.equals(view)) {
// Ignore views that are already registered.
return;
} else {
throw new IllegalArgumentException(
"A different view with the same name is already registered: " + existing);
}
}
Measure measure = view.getMeasure();
Measure registeredMeasure = registeredMeasures.get(measure.getName());
if (registeredMeasure != null && !registeredMeasure.equals(measure)) {
throw new IllegalArgumentException(
"A different measure with the same name is already registered: " + registeredMeasure);
}
registeredViews.put(view.getName(), view);
if (registeredMeasure == null) {
registeredMeasures.put(measure.getName(), measure);
}
mutableMap.put(view.getMeasure().getName(), MutableViewData.create(view, clock.now()));
}
@javax.annotation.Nullable
private synchronized MutableViewData getMutableViewData(View.Name viewName) {
View view = registeredViews.get(viewName);
if (view == null) {
return null;
}
Collection<MutableViewData> views = mutableMap.get(view.getMeasure().getName());
for (MutableViewData viewData : views) {
if (viewData.getView().getName().equals(viewName)) {
return viewData;
}
}
throw new AssertionError(
"Internal error: Not recording stats for view: \""
+ viewName
+ "\" registeredViews="
+ registeredViews
+ ", mutableMap="
+ mutableMap);
}
// Records stats with a set of tags.
synchronized void record(TagContext tags, MeasureMapInternal stats, Timestamp timestamp) {
Iterator<Measurement> iterator = stats.iterator();
while (iterator.hasNext()) {
Measurement measurement = iterator.next();
Measure measure = measurement.getMeasure();
if (!measure.equals(registeredMeasures.get(measure.getName()))) {
// unregistered measures will be ignored.
continue;
}
Collection<MutableViewData> views = mutableMap.get(measure.getName());
for (MutableViewData view : views) {
measurement.match(
new RecordDoubleValueFunc(tags, view, timestamp),
new RecordLongValueFunc(tags, view, timestamp),
Functions.</*@Nullable*/ Void>throwAssertionError());
}
}
}
// Clear stats for all the current MutableViewData
synchronized void clearStats() {
for (Entry<String, Collection<MutableViewData>> entry : mutableMap.asMap().entrySet()) {
for (MutableViewData mutableViewData : entry.getValue()) {
mutableViewData.clearStats();
}
}
}
// Resume stats collection for all MutableViewData.
synchronized void resumeStatsCollection(Timestamp now) {
for (Entry<String, Collection<MutableViewData>> entry : mutableMap.asMap().entrySet()) {
for (MutableViewData mutableViewData : entry.getValue()) {
mutableViewData.resumeStatsCollection(now);
}
}
}
private static final class RecordDoubleValueFunc implements Function<MeasurementDouble, Void> {
@Override
public Void apply(MeasurementDouble arg) {
view.record(tags, arg.getValue(), timestamp);
return null;
}
private final TagContext tags;
private final MutableViewData view;
private final Timestamp timestamp;
private RecordDoubleValueFunc(TagContext tags, MutableViewData view, Timestamp timestamp) {
this.tags = tags;
this.view = view;
this.timestamp = timestamp;
}
}
private static final class RecordLongValueFunc implements Function<MeasurementLong, Void> {
@Override
public Void apply(MeasurementLong arg) {
view.record(tags, arg.getValue(), timestamp);
return null;
}
private final TagContext tags;
private final MutableViewData view;
private final Timestamp timestamp;
private RecordLongValueFunc(TagContext tags, MutableViewData view, Timestamp timestamp) {
this.tags = tags;
this.view = view;
this.timestamp = timestamp;
}
}
}
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