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Core module of Micrometer containing instrumentation API and implementation
/*
* Copyright 2017 VMware, Inc.
*
* 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
*
* https://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.micrometer.core.instrument.search;
import io.micrometer.core.instrument.Timer;
import io.micrometer.core.instrument.*;
import io.micrometer.core.lang.Nullable;
import java.util.*;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static java.util.stream.Collectors.toList;
/**
* Search that requires the search terms are satisfiable, or an
* {@link MeterNotFoundException} is thrown.
*
* @author Jon Schneider
*/
public final class RequiredSearch {
final MeterRegistry registry;
final List requiredTags = new ArrayList<>();
final Set requiredTagKeys = new HashSet<>();
@Nullable
String exactNameMatch;
@Nullable
Predicate nameMatches;
private RequiredSearch(MeterRegistry registry) {
this.registry = registry;
}
/**
* Meter contains a tag with the exact name.
* @param exactName Name to match against.
* @return This search.
*/
public RequiredSearch name(String exactName) {
this.nameMatches = n -> n.equals(exactName);
this.exactNameMatch = exactName;
return this;
}
/**
* Meter contains a tag matching the name predicate.
* @param nameMatches Name matching predicate.
* @return This search.
*/
public RequiredSearch name(Predicate nameMatches) {
this.nameMatches = nameMatches;
return this;
}
/**
* Meter contains a tag with the matching tag keys and values.
* @param tags The tags to match.
* @return This search.
*/
public RequiredSearch tags(Iterable tags) {
tags.forEach(this.requiredTags::add);
return this;
}
/**
* Meter contains a tag with the matching tag keys and values.
* @param tags Must be an even number of arguments representing key/value pairs of
* tags.
* @return This search.
*/
public RequiredSearch tags(String... tags) {
return tags(Tags.of(tags));
}
/**
* Meter contains a tag with the matching key and value.
* @param tagKey The tag key to match.
* @param tagValue The tag value to match.
* @return This search.
*/
public RequiredSearch tag(String tagKey, String tagValue) {
return tags(Tags.of(tagKey, tagValue));
}
/**
* Meter contains a tag with the matching keys.
* @param tagKeys The tag keys to match.
* @return This search.
*/
public RequiredSearch tagKeys(String... tagKeys) {
Collections.addAll(requiredTagKeys, tagKeys);
return this;
}
/**
* @return The first matching {@link Timer}
* @throws MeterNotFoundException if there is no match.
*/
public Timer timer() {
return findOne(Timer.class);
}
/**
* @return The first matching {@link Counter}.
* @throws MeterNotFoundException if there is no match.
*/
public Counter counter() {
return findOne(Counter.class);
}
/**
* @return The first matching {@link Gauge}.
* @throws MeterNotFoundException if there is no match.
*/
public Gauge gauge() {
return findOne(Gauge.class);
}
/**
* @return The first matching {@link FunctionCounter}.
* @throws MeterNotFoundException if there is no match.
*/
public FunctionCounter functionCounter() {
return findOne(FunctionCounter.class);
}
/**
* @return The first matching {@link TimeGauge}.
* @throws MeterNotFoundException if there is no match.
*/
public TimeGauge timeGauge() {
return findOne(TimeGauge.class);
}
/**
* @return The first matching {@link FunctionTimer}.
* @throws MeterNotFoundException if there is no match.
*/
public FunctionTimer functionTimer() {
return findOne(FunctionTimer.class);
}
/**
* @return The first matching {@link DistributionSummary}.
* @throws MeterNotFoundException if there is no match.
*/
public DistributionSummary summary() {
return findOne(DistributionSummary.class);
}
/**
* @return The first matching {@link LongTaskTimer}.
* @throws MeterNotFoundException if there is no match.
*/
public LongTaskTimer longTaskTimer() {
return findOne(LongTaskTimer.class);
}
/**
* @return The first matching {@link Meter}.
* @throws MeterNotFoundException if there is no match.
*/
public Meter meter() {
return findOne(Meter.class);
}
private M findOne(Class clazz) {
Optional meter = meterStream().filter(clazz::isInstance).findAny().map(clazz::cast);
if (meter.isPresent()) {
return meter.get();
}
throw MeterNotFoundException.forSearch(this, clazz);
}
private Collection findAll(Class clazz) {
List meters = meterStream().filter(clazz::isInstance).map(clazz::cast).collect(toList());
if (meters.isEmpty()) {
throw MeterNotFoundException.forSearch(this, clazz);
}
return meters;
}
/**
* @return All matching meters.
* @throws MeterNotFoundException if there is no match.
*/
public Collection meters() {
List meters = meterStream().collect(Collectors.toList());
if (meters.isEmpty()) {
throw MeterNotFoundException.forSearch(this, Meter.class);
}
return meters;
}
private Stream meterStream() {
Stream meterStream = registry.getMeters().stream()
.filter(m -> nameMatches == null || nameMatches.test(m.getId().getName()));
if (!requiredTags.isEmpty() || !requiredTagKeys.isEmpty()) {
meterStream = meterStream.filter(m -> {
boolean requiredKeysPresent = true;
if (!requiredTagKeys.isEmpty()) {
final List tagKeys = new ArrayList<>();
m.getId().getTagsAsIterable().forEach(t -> tagKeys.add(t.getKey()));
requiredKeysPresent = tagKeys.containsAll(requiredTagKeys);
}
return requiredKeysPresent && m.getId().getTags().containsAll(requiredTags);
});
}
return meterStream;
}
/**
* @return All matching {@link Counter} meters.
*/
public Collection counters() {
return findAll(Counter.class);
}
/**
* @return All matching {@link Gauge} meters.
*/
public Collection gauges() {
return findAll(Gauge.class);
}
/**
* @return All matching {@link Timer} meters.
*/
public Collection timers() {
return findAll(Timer.class);
}
/**
* @return All matching {@link DistributionSummary} meters.
*/
public Collection summaries() {
return findAll(DistributionSummary.class);
}
/**
* @return All matching {@link LongTaskTimer} meters.
*/
public Collection longTaskTimers() {
return findAll(LongTaskTimer.class);
}
/**
* @return All matching {@link FunctionCounter} meters.
*/
public Collection functionCounters() {
return findAll(FunctionCounter.class);
}
/**
* @return All matching {@link FunctionTimer} meters.
*/
public Collection functionTimers() {
return findAll(FunctionTimer.class);
}
/**
* @return All matching {@link TimeGauge} meters.
*/
public Collection timeGauges() {
return findAll(TimeGauge.class);
}
/**
* Initiate a new search for meters inside a registry.
* @param registry The registry to locate meters in.
* @return A new search.
*/
public static RequiredSearch in(MeterRegistry registry) {
return new RequiredSearch(registry);
}
}