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Spring Integration for DropWizard
// Copyright (c) 2012 Health Market Science, Inc.
package com.hmsonline.dropwizard.spring;
import java.text.MessageFormat;
import java.util.EnumSet;
import java.util.List;
import java.util.Map;
import com.codahale.metrics.health.HealthCheck;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.hmsonline.dropwizard.spring.web.FilterConfiguration;
import com.hmsonline.dropwizard.spring.web.RestContextLoaderListener;
import com.hmsonline.dropwizard.spring.web.ServletConfiguration;
import com.hmsonline.dropwizard.spring.web.XmlRestWebApplicationContext;
import io.dropwizard.Application;
import io.dropwizard.servlets.tasks.Task;
import io.dropwizard.setup.Bootstrap;
import io.dropwizard.setup.Environment;
import org.eclipse.jetty.servlet.FilterHolder;
import org.eclipse.jetty.servlet.ServletHolder;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
import javax.servlet.DispatcherType;
import javax.servlet.Filter;
import javax.servlet.Servlet;
public class SpringService extends Application {
public static void main(String[] args) throws Exception {
new SpringService().run(args);
}
@Override
public String getName() {
return "dropwizard-spring";
}
@Override
public void initialize(Bootstrap bootstrap) {
// This is needed to avoid an exception when deserializing Json to an ArrayList
bootstrap.getObjectMapper().enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY);
}
@Override
public void run(SpringServiceConfiguration configuration, Environment environment) throws ClassNotFoundException {
SpringConfiguration config = configuration.getSpring();
ApplicationContext parentCtx = this.initSpringParent();
Dropwizard dw = (Dropwizard) parentCtx.getBean("dropwizard");
dw.setConfiguration(configuration);
dw.setEnvironment(environment);
ApplicationContext appCtx = initSpring(config, parentCtx);
loadResourceBeans(config.getResources(), appCtx, environment);
loadHealthCheckBeans(config.getHealthChecks(), appCtx, environment);
loadManagedBeans(config.getManaged(), appCtx, environment);
loadLifeCycleBeans(config.getLifeCycles(), appCtx, environment);
loadJerseyProviders(config.getJerseyProviders(), appCtx, environment);
loadTasks(config.getTasks(), appCtx, environment);
// Load filter or listeners for WebApplicationContext.
if (appCtx instanceof XmlRestWebApplicationContext) {
loadWebConfigs(environment, config, appCtx);
}
enableJerseyFeatures(config.getEnabledJerseyFeatures(), environment);
disableJerseyFeatures(config.getDisabledJerseyFeatures(), environment);
}
/**
* Load filter, servlets or listeners for WebApplicationContext.
*/
private void loadWebConfigs(Environment environment, SpringConfiguration config, ApplicationContext appCtx) throws ClassNotFoundException {
// Load filters.
loadFilters(config.getFilters(), environment);
// Load servlet listener.
environment.servlets().addServletListeners(new RestContextLoaderListener((XmlRestWebApplicationContext) appCtx));
// Load servlets.
loadServlets(config.getServlets(), environment);
}
/**
* Load all filters.
*/
@SuppressWarnings("unchecked")
private void loadFilters(Map filters, Environment environment) throws ClassNotFoundException {
if (filters != null) {
for (Map.Entry filterEntry : filters.entrySet()) {
FilterConfiguration filter = filterEntry.getValue();
// Create filter holder
FilterHolder filterHolder = new FilterHolder((Class) Class.forName(filter.getClazz()));
// Set name of filter
filterHolder.setName(filterEntry.getKey());
// Set params
if (filter.getParam() != null) {
for (Map.Entry entry : filter.getParam().entrySet()) {
filterHolder.setInitParameter(entry.getKey(), entry.getValue());
}
}
// Add filter
environment.getApplicationContext().addFilter(filterHolder, filter.getUrl(), EnumSet.of(DispatcherType.REQUEST));
}
}
}
/**
* Load all servlets.
*/
@SuppressWarnings("unchecked")
private void loadServlets(Map servlets, Environment environment) throws ClassNotFoundException {
if (servlets != null) {
for (Map.Entry servletEntry : servlets.entrySet()) {
ServletConfiguration servlet = servletEntry.getValue();
// Create servlet holder
ServletHolder servletHolder = new ServletHolder((Class) Class.forName(servlet.getClazz()));
// Set name of servlet
servletHolder.setName(servletEntry.getKey());
// Set params
if (servlet.getParam() != null) {
for (Map.Entry entry : servlet.getParam().entrySet()) {
servletHolder.setInitParameter(entry.getKey(), entry.getValue());
}
}
// Add servlet
environment.getApplicationContext().addServlet(servletHolder, servlet.getUrl());
}
}
}
private void loadResourceBeans(List resources, ApplicationContext ctx, Environment env) {
if (resources != null) {
for (String resource : resources) {
env.jersey().register(ctx.getBean(resource));
}
}
}
private void loadHealthCheckBeans(List healthChecks, ApplicationContext ctx, Environment env) {
if (healthChecks != null) {
for (String healthCheck : healthChecks) {
HealthCheck healthCheckBean = (HealthCheck) ctx.getBean(healthCheck);
env.healthChecks().register(healthCheck, healthCheckBean);
}
}
}
private void loadManagedBeans(List manageds, ApplicationContext ctx, Environment env) {
if (manageds != null) {
for (String managed : manageds) {
env.getApplicationContext().manage(ctx.getBean(managed));
}
}
}
private void loadLifeCycleBeans(List lifeCycles, ApplicationContext ctx, Environment env) {
if (lifeCycles != null) {
for (String lifeCycle : lifeCycles) {
env.getApplicationContext().manage(ctx.getBean(lifeCycle));
}
}
}
private void loadJerseyProviders(List providers, ApplicationContext ctx, Environment env) {
if (providers != null) {
for (String provider : providers) {
env.jersey().register(ctx.getBean(provider));
}
}
}
private void loadTasks(List tasks, ApplicationContext ctx, Environment env) {
if (tasks != null) {
for (String task : tasks) {
env.admin().addTask((Task) ctx.getBean(task));
}
}
}
private void enableJerseyFeatures(List features, Environment env) {
if (features != null) {
for (String feature : features) {
env.jersey().enable(feature);
}
}
}
private void disableJerseyFeatures(List features, Environment env) {
if (features != null) {
for (String feature : features) {
env.jersey().disable(feature);
}
}
}
private ApplicationContext initSpringParent() {
ApplicationContext parent = new ClassPathXmlApplicationContext(
new String[]{"dropwizardSpringApplicationContext.xml"}, true);
return parent;
}
private ApplicationContext initSpring(SpringConfiguration config, ApplicationContext parent) {
ApplicationContext appCtx = null;
// Get Application Context Type
String ctxType = config.getAppContextType();
// Get Config Location Type.
String cfgLocationType = config.getConfigLocationsType();
String[] configLocations = config.getConfigLocations().toArray(new String[config.getConfigLocations().size()]);
if (SpringConfiguration.WEB_APPLICATION_CONTEXT.equals(ctxType)) {
// Create Web Application Context.
appCtx = new XmlRestWebApplicationContext(configLocations, cfgLocationType, true, parent);
} else if (SpringConfiguration.APPLICATION_CONTEXT.equals(ctxType)) {
// Create Application Context.
if (SpringConfiguration.FILE_CONFIG.equals(cfgLocationType)) {
appCtx = new FileSystemXmlApplicationContext(configLocations, true, parent);
} else if (SpringConfiguration.CLASSPATH_CONFIG.equals(cfgLocationType)) {
appCtx = new ClassPathXmlApplicationContext(configLocations, true, parent);
} else {
throw new IllegalArgumentException(MessageFormat.format("Configuration Error: configLocationsType must be either \"{0}\" or \"{1}\"", SpringConfiguration.FILE_CONFIG, SpringConfiguration.CLASSPATH_CONFIG));
}
} else {
throw new IllegalArgumentException(MessageFormat.format("Configuration Error: appContextType must be either \"{0}\" or \"{1}\"", SpringConfiguration.WEB_APPLICATION_CONTEXT, SpringConfiguration.APPLICATION_CONTEXT));
}
return appCtx;
}
}