/*
* Copyright 2012-2016 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
*
* 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 org.springframework.boot.actuate.autoconfigure;
import com.codahale.metrics.MetricRegistry;
import org.springframework.boot.actuate.metrics.CounterService;
import org.springframework.boot.actuate.metrics.GaugeService;
import org.springframework.boot.actuate.metrics.buffer.BufferCounterService;
import org.springframework.boot.actuate.metrics.buffer.BufferGaugeService;
import org.springframework.boot.actuate.metrics.buffer.BufferMetricReader;
import org.springframework.boot.actuate.metrics.buffer.CounterBuffers;
import org.springframework.boot.actuate.metrics.buffer.GaugeBuffers;
import org.springframework.boot.actuate.metrics.export.Exporter;
import org.springframework.boot.actuate.metrics.export.MetricCopyExporter;
import org.springframework.boot.actuate.metrics.repository.InMemoryMetricRepository;
import org.springframework.boot.actuate.metrics.writer.MetricWriter;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.MessageChannel;
/**
* {@link EnableAutoConfiguration Auto-configuration} for metrics services. Creates
* user-facing {@link GaugeService} and {@link CounterService} instances, and also back
* end repositories to catch the data pumped into them.
* <p>
* In general, even if metric data needs to be stored and analysed remotely, it is
* recommended to use in-memory storage to buffer metric updates locally as is done by the
* default {@link CounterBuffers} and {@link GaugeBuffers}. The values can be exported
* (e.g. on a periodic basis) using an {@link Exporter}, most implementations of which
* have optimizations for sending data to remote repositories.
* <p>
* If Spring Messaging is on the classpath and a {@link MessageChannel} called
* "metricsChannel" is also available, all metric update events are published additionally
* as messages on that channel. Additional analysis or actions can be taken by clients
* subscribing to that channel.
* <p>
* In addition if Dropwizard's metrics library is on the classpath a
* {@link MetricRegistry} will be created and the default counter and gauge services will
* switch to using it instead of the default repository. Users can create "special"
* Dropwizard metrics by prefixing their metric names with the appropriate type (e.g.
* "histogram.*", "meter.*". "timer.*") and sending them to the {@code GaugeService} or
* {@code CounterService}.
* <p>
* By default all metric updates go to all {@link MetricWriter} instances in the
* application context via a {@link MetricCopyExporter} firing every 5 seconds (disable
* this by setting {@code spring.metrics.export.enabled=false}).
*
* @see GaugeService
* @see CounterService
* @see MetricWriter
* @see InMemoryMetricRepository
* @see Exporter
* @author Dave Syer
*/
@Configuration
public class MetricRepositoryAutoConfiguration {
@Configuration
@ConditionalOnMissingBean(GaugeService.class)
static class FastMetricServicesConfiguration {
@Bean
@ConditionalOnMissingBean
public CounterBuffers counterBuffers() {
return new CounterBuffers();
}
@Bean
@ConditionalOnMissingBean
public GaugeBuffers gaugeBuffers() {
return new GaugeBuffers();
}
@Bean
@ExportMetricReader
@ConditionalOnMissingBean
public BufferMetricReader actuatorMetricReader(CounterBuffers counters,
GaugeBuffers gauges) {
return new BufferMetricReader(counters, gauges);
}
@Bean
@ConditionalOnMissingBean(CounterService.class)
public BufferCounterService counterService(CounterBuffers writer) {
return new BufferCounterService(writer);
}
@Bean
@ConditionalOnMissingBean(GaugeService.class)
public BufferGaugeService gaugeService(GaugeBuffers writer) {
return new BufferGaugeService(writer);
}
}
}