org.springframework.cloud.context.restart.RestartListener Maven / Gradle / Ivy
/*
* Copyright 2012-2019 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.cloud.context.restart;
import org.springframework.boot.context.event.ApplicationPreparedEvent;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.event.ContextClosedEvent;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.context.event.SmartApplicationListener;
/**
* A listener that stores enough information about an application, as it starts, to be
* able to restart it later if needed.
*
* @author Dave Syer
*
*/
public class RestartListener implements SmartApplicationListener {
private ConfigurableApplicationContext context;
private ApplicationPreparedEvent event;
@Override
public int getOrder() {
return 0;
}
@Override
public boolean supportsEventType(Class eventType) {
return ApplicationPreparedEvent.class.isAssignableFrom(eventType)
|| ContextRefreshedEvent.class.isAssignableFrom(eventType)
|| ContextClosedEvent.class.isAssignableFrom(eventType);
}
@Override
public boolean supportsSourceType(Class sourceType) {
return true;
}
@Override
public void onApplicationEvent(ApplicationEvent input) {
if (input instanceof ApplicationPreparedEvent) {
this.event = (ApplicationPreparedEvent) input;
if (this.context == null) {
this.context = this.event.getApplicationContext();
}
}
else if (input instanceof ContextRefreshedEvent) {
if (this.context != null && input.getSource().equals(this.context)
&& this.event != null) {
this.context.publishEvent(this.event);
}
}
else {
if (this.context != null && input.getSource().equals(this.context)) {
this.context = null;
this.event = null;
}
}
}
}