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/**
* Jooby https://jooby.io
* Apache License Version 2.0 https://jooby.io/LICENSE.txt
* Copyright 2014 Edgar Espina
*/
package io.jooby.metrics;
import com.codahale.metrics.Metric;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.Reporter;
import com.codahale.metrics.health.HealthCheck;
import com.codahale.metrics.health.HealthCheckRegistry;
import com.typesafe.config.Config;
import io.jooby.Extension;
import io.jooby.Jooby;
import io.jooby.Router;
import io.jooby.ServiceRegistry;
import javax.annotation.Nonnull;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.function.BiFunction;
import java.util.function.Consumer;
import java.util.function.Function;
import static java.util.Objects.requireNonNull;
public class MetricsModule implements Extension {
static final String CACHE_HEADER_NAME = "Cache-Control";
static final String CACHE_HEADER_VALUE = "must-revalidate,no-cache,no-store";
private final String pattern;
private final List> routes = new ArrayList<>();
private final Map metrics = new LinkedHashMap<>();
private final Map> metricClasses = new LinkedHashMap<>();
private final Map healthChecks = new LinkedHashMap<>();
private final Map> healthCheckClasses = new LinkedHashMap<>();
private final Set> reporters = new LinkedHashSet<>();
private final MetricRegistry metricRegistry;
private final HealthCheckRegistry healthCheckRegistry;
/**
* Creates a new {@link MetricsModule}.
*
* @param metricRegistry Use the given metricRegistry.
* @param healthCheckRegistry Use the given healthCheckRegistry.
* @param pattern A root pattern where to publish all the services. Default is: /sys.
*/
public MetricsModule(final MetricRegistry metricRegistry,
final HealthCheckRegistry healthCheckRegistry, final String pattern) {
this.metricRegistry = requireNonNull(metricRegistry, "Metric registry is required.");
this.healthCheckRegistry = requireNonNull(healthCheckRegistry, "Health check registry is required.");
this.pattern = requireNonNull(pattern, "A pattern is required.");
}
/**
* Creates a new {@link MetricsModule}.
*
* @param metricRegistry Use the given metricRegistry.
* @param healthCheckRegistry Use the given healthCheckRegistry.
*/
public MetricsModule(final MetricRegistry metricRegistry, final HealthCheckRegistry healthCheckRegistry) {
this(metricRegistry, healthCheckRegistry, "/sys");
}
/**
* Creates a new {@link MetricsModule}.
*
* @param metricRegistry Use the given metricRegistry.
* @param pattern A root pattern where to publish all the services. Default is: /sys.
*/
public MetricsModule(final MetricRegistry metricRegistry, final String pattern) {
this(metricRegistry, new HealthCheckRegistry(), pattern);
}
/**
* Creates a new {@link MetricsModule}.
*
* @param pattern A root pattern where to publish all the services. Default is: /sys.
*/
public MetricsModule(final String pattern) {
this(new MetricRegistry(), pattern);
}
/**
* Creates a new {@link MetricsModule}. Services will be available at: /sys.
*
* @param healthCheckRegistry Use the given healthCheckRegistry.
*/
public MetricsModule(final HealthCheckRegistry healthCheckRegistry) {
this(new MetricRegistry(), healthCheckRegistry, "/sys");
}
/**
* Creates a new {@link MetricsModule}. Services will be available at: /sys.
*
* @param metricRegistry Use the given metricRegistry.
*/
public MetricsModule(final MetricRegistry metricRegistry) {
this(metricRegistry, "/sys");
}
/**
* Creates a new {@link MetricsModule}. Services will be available at: /sys.
*/
public MetricsModule() {
this("/sys");
}
/**
* Append a simple ping handler that results in a 200 responses with a
* pong body. See {@link PingHandler}
*
* @return This metrics module.
*/
public MetricsModule ping() {
routes.add(router -> router
.get(this.pattern + "/ping", new PingHandler()));
return this;
}
/**
* Append a handler that prints thread states (a.k.a thread dump). See {@link ThreadDumpHandler}.
*
* @return This metrics module.
*/
public MetricsModule threadDump() {
routes.add(router -> router
.get(this.pattern + "/thread-dump", new ThreadDumpHandler()));
return this;
}
/**
* Append a metric to the {@link MetricRegistry}, this call is identical to
* {@link MetricRegistry#register(String, Metric)}.
*
* @param name Name of the metric.
* @param metric A metric object
* @return This metrics module.
*/
public MetricsModule metric(final String name, final Metric metric) {
metrics.put(name, metric);
return this;
}
/**
* Append a metric to the {@link MetricRegistry}. The metric will be resolved by Guice. This call
* is identical to {@link MetricRegistry#register(String, Metric)}.
*
* @param name Name of the metric.
* @param metric A metric object.
* @param Metric type.
* @return This metrics module.
*/
public MetricsModule metric(final String name, final Class metric) {
metricClasses.put(name, metric);
return this;
}
/**
* Append a health check to the {@link HealthCheckRegistry}. This call is identical to
* {@link HealthCheckRegistry#register(String, HealthCheck)}.
*
* @param name Name of the check.
* @param check A check object.
* @return This metrics module.
*/
public MetricsModule healthCheck(final String name, final HealthCheck check) {
healthChecks.put(name, check);
return this;
}
/**
* Append a health check to the {@link HealthCheckRegistry}. The metric will be resolved by Guice.
* This call is identical to {@link HealthCheckRegistry#register(String, HealthCheck)}.
*
* @param name Name of the check.
* @param check A check object.
* @param {@link HealthCheck} type.
* @return This metrics module.
*/
public MetricsModule healthCheck(final String name, final Class check) {
healthCheckClasses.put(name, check);
return this;
}
/**
* Append a {@link Reporter} to the {@link MetricRegistry}.
*
* @param callback Reporter callback.
* @return This metrics module.
*/
public MetricsModule reporter(final BiFunction callback) {
this.reporters.add(requireNonNull(callback, "Callback is required."));
return this;
}
/**
* Append a {@link Reporter} to the {@link MetricRegistry}.
*
* @param callback Reporter callback.
* @return This metrics module.
*/
public MetricsModule reporter(final Function callback) {
return reporter((registry, conf) -> callback.apply(registry));
}
@Override
public void install(@Nonnull Jooby application) {
MetricHandler metricHandler = new MetricHandler();
application.get(this.pattern + "/metrics", metricHandler);
application.get(this.pattern + "/metrics/:type", metricHandler);
application.get(this.pattern + "/healthcheck", new HealthCheckHandler());
routes.forEach(r -> r.accept(application));
ServiceRegistry registry = application.getServices();
registry.putIfAbsent(MetricRegistry.class, metricRegistry);
registry.putIfAbsent(HealthCheckRegistry.class, healthCheckRegistry);
metrics.forEach(metricRegistry::register);
healthChecks.forEach(healthCheckRegistry::register);
final Set reporters = new HashSet<>();
application.onStarted(() -> {
metricClasses.forEach((name, clazz) -> metricRegistry.register(name, application.require(clazz)));
healthCheckClasses.forEach((name, clazz) -> healthCheckRegistry.register(name, application.require(clazz)));
Config config = application.getConfig();
this.reporters.stream()
.map(r -> r.apply(metricRegistry, config))
.filter(Objects::nonNull)
.forEachOrdered(reporters::add);
});
application.onStop(() -> reporters.forEach(r -> {
try {
r.close();
} catch (IOException e) {
application.getLog().error("close of {} resulted in error", r, e);
}
}));
}
}
