/*
* Copyright (C) 2013 Square, 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
*
* 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 com.squareup.rack.examples.dropwizard;
import com.google.common.io.Resources;
import com.squareup.rack.examples.dropwizard.health.FakeHealthCheck;
import com.squareup.rack.examples.dropwizard.resources.EmptyResource;
import com.squareup.rack.jruby.JRubyRackApplication;
import com.squareup.rack.servlet.RackServlet;
import com.yammer.dropwizard.Service;
import com.yammer.dropwizard.config.Bootstrap;
import com.yammer.dropwizard.config.Configuration;
import com.yammer.dropwizard.config.Environment;
import java.io.IOException;
import org.jruby.embed.ScriptingContainer;
import org.jruby.runtime.builtin.IRubyObject;
import static com.google.common.base.Throwables.propagate;
import static com.google.common.io.Resources.getResource;
import static java.nio.charset.Charset.defaultCharset;
public class ExampleService extends Service<Configuration> {
@Override public void initialize(Bootstrap<Configuration> bootstrap) {
// Nothing to do here.
}
@Override public void run(Configuration config, Environment environment) {
// Suppress the "THIS SERVICE HAS NO HEALTHCHECKS" warning.
// A real service would have proper health checks.
environment.addHealthCheck(new FakeHealthCheck());
// Suppress the "ResourceConfig instance does not contain any root resource classes" error.
// A real service would probably provide a Jersey resource or two.
environment.addResource(EmptyResource.class);
// Here's the interesting part:
// Mount the Rack application defined in the config.ru file on the classpath at /rack.
environment.addServlet(createRackServlet(), "/rack/*");
}
private RackServlet createRackServlet() {
return new RackServlet(new JRubyRackApplication(createApplication()));
}
private IRubyObject createApplication() {
// There's a lot you could do here; for now, we just read a rackup file from the classpath,
// then build a Rack application based on it.
ScriptingContainer container = new ScriptingContainer();
container.put("builder_script", readResource("config.ru"));
return container.parse("require 'rack'; Rack::Builder.new_from_string(builder_script)").run();
}
private String readResource(String path) {
try {
return Resources.toString(getResource(path), defaultCharset());
} catch (IOException e) {
throw propagate(e);
}
}
}