io.micrometer.core.instrument.binder.db.DatabaseTableMetrics Maven / Gradle / Ivy
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/**
* 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.binder.db;
import io.micrometer.core.instrument.Gauge;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Tag;
import io.micrometer.core.instrument.Tags;
import io.micrometer.core.instrument.binder.BaseUnits;
import io.micrometer.core.instrument.binder.MeterBinder;
import io.micrometer.core.lang.NonNullApi;
import io.micrometer.core.lang.NonNullFields;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.function.ToDoubleFunction;
/**
* @author Jon Schneider
*/
@NonNullApi
@NonNullFields
public class DatabaseTableMetrics implements MeterBinder {
private final DataSource dataSource;
private final String query;
private final String dataSourceName;
private final String tableName;
private final Iterable tags;
/**
* Record the row count for an individual database table.
*
* @param dataSource The data source to use to run the row count query.
* @param dataSourceName Will be used to tag metrics with "db".
* @param tableName The name of the table to report table size for.
* @param tags Tags to apply to all recorded metrics.
*/
public DatabaseTableMetrics(DataSource dataSource, String dataSourceName, String tableName, Iterable tags) {
this(dataSource, "SELECT COUNT(1) FROM " + tableName, dataSourceName, tableName, tags);
}
/**
* Record the result based on a query.
*
* @param dataSource The data source to use to run the row count query.
* @param query The query to be run against the table. The first column of the result will be the metric and
* it should return a single row.
* @param dataSourceName The name prefix of the metrics.
* @param tableName The name of the table to report table size for.
* @param tags Tags to apply to all recorded metrics.
*/
public DatabaseTableMetrics(DataSource dataSource, String query, String dataSourceName, String tableName, Iterable tags) {
this.dataSource = dataSource;
this.query = query;
this.dataSourceName = dataSourceName;
this.tableName = tableName;
this.tags = tags;
}
/**
* Record the row count for an individual database table.
*
* @param registry The registry to bind metrics to.
* @param tableName The name of the table to report table size for.
* @param dataSourceName Will be used to tag metrics with "db".
* @param dataSource The data source to use to run the row count query.
* @param tags Tags to apply to all recorded metrics. Must be an even number of arguments representing key/value pairs of tags.
*/
public static void monitor(MeterRegistry registry, String tableName, String dataSourceName, DataSource dataSource, String... tags) {
monitor(registry, dataSource, dataSourceName, tableName, Tags.of(tags));
}
/**
* Record the row count for an individual database table.
*
* @param registry The registry to bind metrics to.
* @param dataSource The data source to use to run the row count query.
* @param dataSourceName The name prefix of the metrics.
* @param tableName The name of the table to report table size for.
* @param tags Tags to apply to all recorded metrics.
*/
public static void monitor(MeterRegistry registry, DataSource dataSource, String dataSourceName, String tableName, Iterable tags) {
new DatabaseTableMetrics(dataSource, dataSourceName, tableName, tags).bindTo(registry);
}
@Override
public void bindTo(MeterRegistry registry) {
ToDoubleFunction totalRows = ds -> {
try (Connection conn = ds.getConnection();
PreparedStatement ps = conn.prepareStatement(query);
ResultSet rs = ps.executeQuery()) {
rs.next();
return rs.getInt(1);
} catch (SQLException ignored) {
return 0;
}
};
Gauge.builder("db.table.size", dataSource, totalRows)
.tags(tags)
.tag("db", dataSourceName)
.tag("table", tableName)
.description("Number of rows in a database table")
.baseUnit(BaseUnits.ROWS)
.register(registry);
}
}