org.springframework.boot.actuate.metrics.jdbc.DataSourcePoolMetrics Maven / Gradle / Ivy
/*
* Copyright 2012-2018 the original author or 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
*
* 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 org.springframework.boot.actuate.metrics.jdbc;
import java.util.Collection;
import java.util.Map;
import java.util.function.Function;
import javax.sql.DataSource;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Tag;
import io.micrometer.core.instrument.Tags;
import io.micrometer.core.instrument.binder.MeterBinder;
import org.springframework.boot.jdbc.metadata.CompositeDataSourcePoolMetadataProvider;
import org.springframework.boot.jdbc.metadata.DataSourcePoolMetadata;
import org.springframework.boot.jdbc.metadata.DataSourcePoolMetadataProvider;
import org.springframework.util.Assert;
import org.springframework.util.ConcurrentReferenceHashMap;
/**
* A {@link MeterBinder} for a {@link DataSource}.
*
* @author Jon Schneider
* @author Phillip Webb
* @since 2.0.0
*/
public class DataSourcePoolMetrics implements MeterBinder {
private final DataSource dataSource;
private final CachingDataSourcePoolMetadataProvider metadataProvider;
private final Iterable tags;
public DataSourcePoolMetrics(DataSource dataSource,
Collection metadataProviders,
String dataSourceName, Iterable tags) {
this(dataSource, new CompositeDataSourcePoolMetadataProvider(metadataProviders),
dataSourceName, tags);
}
public DataSourcePoolMetrics(DataSource dataSource,
DataSourcePoolMetadataProvider metadataProvider, String name,
Iterable tags) {
Assert.notNull(dataSource, "DataSource must not be null");
Assert.notNull(metadataProvider, "MetadataProvider must not be null");
this.dataSource = dataSource;
this.metadataProvider = new CachingDataSourcePoolMetadataProvider(
metadataProvider);
this.tags = Tags.concat(tags, "name", name);
}
@Override
public void bindTo(MeterRegistry registry) {
if (this.metadataProvider.getDataSourcePoolMetadata(this.dataSource) != null) {
bindPoolMetadata(registry, "active", DataSourcePoolMetadata::getActive);
bindPoolMetadata(registry, "max", DataSourcePoolMetadata::getMax);
bindPoolMetadata(registry, "min", DataSourcePoolMetadata::getMin);
}
}
private void bindPoolMetadata(MeterRegistry registry,
String metricName, Function function) {
bindDataSource(registry, metricName,
this.metadataProvider.getValueFunction(function));
}
private void bindDataSource(MeterRegistry registry,
String metricName, Function function) {
if (function.apply(this.dataSource) != null) {
registry.gauge("jdbc.connections." + metricName, this.tags, this.dataSource,
(m) -> function.apply(m).doubleValue());
}
}
private static class CachingDataSourcePoolMetadataProvider
implements DataSourcePoolMetadataProvider {
private static final Map cache = new ConcurrentReferenceHashMap<>();
private final DataSourcePoolMetadataProvider metadataProvider;
CachingDataSourcePoolMetadataProvider(
DataSourcePoolMetadataProvider metadataProvider) {
this.metadataProvider = metadataProvider;
}
public Function getValueFunction(
Function function) {
return (dataSource) -> function.apply(getDataSourcePoolMetadata(dataSource));
}
@Override
public DataSourcePoolMetadata getDataSourcePoolMetadata(DataSource dataSource) {
DataSourcePoolMetadata metadata = cache.get(dataSource);
if (metadata == null) {
metadata = this.metadataProvider.getDataSourcePoolMetadata(dataSource);
cache.put(dataSource, metadata);
}
return metadata;
}
}
}