io.dropwizard.core.setup.Environment Maven / Gradle / Ivy
package io.dropwizard.core.setup;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.SharedMetricRegistries;
import com.codahale.metrics.health.HealthCheckRegistry;
import com.codahale.metrics.health.SharedHealthCheckRegistries;
import com.fasterxml.jackson.databind.ObjectMapper;
import io.dropwizard.core.Configuration;
import io.dropwizard.core.validation.InjectValidatorFeature;
import io.dropwizard.health.HealthEnvironment;
import io.dropwizard.jackson.Jackson;
import io.dropwizard.jersey.DropwizardResourceConfig;
import io.dropwizard.jersey.setup.JerseyContainerHolder;
import io.dropwizard.jersey.setup.JerseyEnvironment;
import io.dropwizard.jersey.setup.JerseyServletContainer;
import io.dropwizard.jersey.validation.Validators;
import io.dropwizard.jetty.MutableServletContextHandler;
import io.dropwizard.jetty.setup.ServletEnvironment;
import io.dropwizard.lifecycle.setup.LifecycleEnvironment;
import org.checkerframework.checker.nullness.qual.Nullable;
import javax.servlet.Servlet;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadPoolExecutor;
import static java.util.Objects.requireNonNull;
/**
* A Dropwizard application's environment.
*/
public class Environment {
private final String name;
private final MetricRegistry metricRegistry;
private final HealthCheckRegistry healthCheckRegistry;
private final ObjectMapper objectMapper;
private Validator validator;
private final JerseyContainerHolder jerseyServletContainer;
private final JerseyEnvironment jerseyEnvironment;
private final MutableServletContextHandler servletContext;
private final ServletEnvironment servletEnvironment;
private final LifecycleEnvironment lifecycleEnvironment;
private final MutableServletContextHandler adminContext;
private final AdminEnvironment adminEnvironment;
private final HealthEnvironment healthEnvironment;
private final ExecutorService healthCheckExecutorService;
/**
* Creates a new environment.
*
* @param name the name of the application
* @param objectMapper the {@link ObjectMapper} for the application
*/
public Environment(String name,
ObjectMapper objectMapper,
ValidatorFactory validatorFactory,
MetricRegistry metricRegistry,
@Nullable ClassLoader classLoader,
HealthCheckRegistry healthCheckRegistry,
Configuration configuration) {
this.name = name;
this.objectMapper = objectMapper;
this.metricRegistry = metricRegistry;
this.healthCheckRegistry = healthCheckRegistry;
this.validator = validatorFactory.getValidator();
this.servletContext = new MutableServletContextHandler();
servletContext.setClassLoader(classLoader);
this.servletEnvironment = new ServletEnvironment(servletContext);
this.adminContext = new MutableServletContextHandler();
adminContext.setClassLoader(classLoader);
final AdminFactory adminFactory = configuration.getAdminFactory();
this.adminEnvironment = new AdminEnvironment(adminContext, healthCheckRegistry, metricRegistry, adminFactory);
this.healthEnvironment = new HealthEnvironment(healthCheckRegistry);
this.lifecycleEnvironment = new LifecycleEnvironment(metricRegistry);
final DropwizardResourceConfig jerseyConfig = new DropwizardResourceConfig(metricRegistry);
jerseyConfig.setContextPath(servletContext.getContextPath());
this.jerseyServletContainer = new JerseyContainerHolder(new JerseyServletContainer(jerseyConfig));
final JerseyEnvironment jerseyEnv = new JerseyEnvironment(jerseyServletContainer, jerseyConfig);
jerseyEnv.register(new InjectValidatorFeature(validatorFactory));
this.jerseyEnvironment = jerseyEnv;
final HealthCheckConfiguration healthCheckConfig = adminFactory.getHealthChecks();
this.healthCheckExecutorService = this.lifecycle().executorService("TimeBoundHealthCheck-pool-%d")
.workQueue(new ArrayBlockingQueue<>(healthCheckConfig.getWorkQueueSize()))
.minThreads(healthCheckConfig.getMinThreads())
.maxThreads(healthCheckConfig.getMaxThreads())
.threadFactory(r -> {
final Thread thread = Executors.defaultThreadFactory().newThread(r);
thread.setDaemon(true);
return thread;
})
.rejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy())
.build();
// Set the default metric registry to the one in this environment, if
// the default isn't already set. If a default is already registered,
// ignore the exception.
try {
SharedMetricRegistries.setDefault("default", metricRegistry);
} catch (IllegalStateException ignored) {
}
try {
SharedHealthCheckRegistries.setDefault("default", healthCheckRegistry);
} catch (IllegalStateException ignored) {
}
}
/**
* Creates an environment with the system classloader, default object mapper, default validator factory,
* default health check registry, and default configuration for tests.
*
* @since 2.0
*/
public Environment(String name) {
this(name, Jackson.newObjectMapper(), Validators.newValidatorFactory(), new MetricRegistry(), ClassLoader.getSystemClassLoader(), new HealthCheckRegistry(), new Configuration());
}
/**
* Returns the application's {@link JerseyEnvironment}.
*/
public JerseyEnvironment jersey() {
return jerseyEnvironment;
}
/**
* Returns an {@link ExecutorService} to run time bound health checks
*/
public ExecutorService getHealthCheckExecutorService() {
return healthCheckExecutorService;
}
/**
* Returns the application's {@link AdminEnvironment}.
*/
public AdminEnvironment admin() {
return adminEnvironment;
}
/**
* Returns the application's {@link LifecycleEnvironment}.
*/
public LifecycleEnvironment lifecycle() {
return lifecycleEnvironment;
}
/**
* Returns the application's {@link ServletEnvironment}.
*/
public ServletEnvironment servlets() {
return servletEnvironment;
}
/**
* Returns the application's {@link HealthEnvironment}.
*/
public HealthEnvironment health() {
return healthEnvironment;
}
/**
* Returns the application's {@link ObjectMapper}.
*/
public ObjectMapper getObjectMapper() {
return objectMapper;
}
/**
* Returns the application's name.
*/
public String getName() {
return name;
}
/**
* Returns the application's {@link Validator}.
*/
public Validator getValidator() {
return validator;
}
/**
* Sets the application's {@link Validator}.
*/
public void setValidator(Validator validator) {
this.validator = requireNonNull(validator);
}
/**
* Returns the application's {@link MetricRegistry}.
*/
public MetricRegistry metrics() {
return metricRegistry;
}
/**
* Returns the application's {@link HealthCheckRegistry}.
*/
public HealthCheckRegistry healthChecks() {
return healthCheckRegistry;
}
/*
* Internal Accessors
*/
public MutableServletContextHandler getApplicationContext() {
return servletContext;
}
@Nullable
public Servlet getJerseyServletContainer() {
return jerseyServletContainer.getContainer();
}
public MutableServletContextHandler getAdminContext() {
return adminContext;
}
}
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