org.springframework.boot.rsocket.context.RSocketPortInfoApplicationContextInitializer Maven / Gradle / Ivy
/*
* Copyright 2012-2020 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
*
* https://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.rsocket.context;
import java.util.HashMap;
import java.util.Map;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.rsocket.server.RSocketServer;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextInitializer;
import org.springframework.context.ApplicationListener;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.Environment;
import org.springframework.core.env.MapPropertySource;
import org.springframework.core.env.MutablePropertySources;
import org.springframework.core.env.PropertySource;
/**
* {@link ApplicationContextInitializer} that sets {@link Environment} properties for the
* ports that {@link RSocketServer} servers are actually listening on. The property
* {@literal "local.rsocket.server.port"} can be injected directly into tests using
* {@link Value @Value} or obtained via the {@link Environment}.
*
* Properties are automatically propagated up to any parent context.
*
* @author Verónica Vásquez
* @author Eddú Meléndez
* @since 2.2.0
*/
public class RSocketPortInfoApplicationContextInitializer
implements ApplicationContextInitializer {
@Override
public void initialize(ConfigurableApplicationContext applicationContext) {
applicationContext.addApplicationListener(new Listener(applicationContext));
}
private static class Listener implements ApplicationListener {
private static final String PROPERTY_NAME = "local.rsocket.server.port";
private final ConfigurableApplicationContext applicationContext;
Listener(ConfigurableApplicationContext applicationContext) {
this.applicationContext = applicationContext;
}
@Override
public void onApplicationEvent(RSocketServerInitializedEvent event) {
if (event.getServer().address() != null) {
setPortProperty(this.applicationContext, event.getServer().address().getPort());
}
}
private void setPortProperty(ApplicationContext context, int port) {
if (context instanceof ConfigurableApplicationContext) {
setPortProperty(((ConfigurableApplicationContext) context).getEnvironment(), port);
}
if (context.getParent() != null) {
setPortProperty(context.getParent(), port);
}
}
private void setPortProperty(ConfigurableEnvironment environment, int port) {
MutablePropertySources sources = environment.getPropertySources();
PropertySource source = sources.get("server.ports");
if (source == null) {
source = new MapPropertySource("server.ports", new HashMap<>());
sources.addFirst(source);
}
setPortProperty(port, source);
}
@SuppressWarnings("unchecked")
private void setPortProperty(int port, PropertySource source) {
((Map) source.getSource()).put(PROPERTY_NAME, port);
}
}
}