org.springframework.cloud.endpoint.event.RefreshEventListener 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.endpoint.event;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.cloud.context.refresh.ContextRefresher;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.event.SmartApplicationListener;
/**
* Calls {@link RefreshEventListener#refresh} when a {@link RefreshEvent} is received.
* Only responds to {@link RefreshEvent} after receiving an {@link ApplicationReadyEvent},
* as the RefreshEvents might come too early in the application lifecycle.
*
* @author Spencer Gibb
*/
public class RefreshEventListener implements SmartApplicationListener {
private static Log log = LogFactory.getLog(RefreshEventListener.class);
private ContextRefresher refresh;
private AtomicBoolean ready = new AtomicBoolean(false);
public RefreshEventListener(ContextRefresher refresh) {
this.refresh = refresh;
}
@Override
public boolean supportsEventType(Class eventType) {
return ApplicationReadyEvent.class.isAssignableFrom(eventType)
|| RefreshEvent.class.isAssignableFrom(eventType);
}
@Override
public void onApplicationEvent(ApplicationEvent event) {
if (event instanceof ApplicationReadyEvent) {
handle((ApplicationReadyEvent) event);
}
else if (event instanceof RefreshEvent) {
handle((RefreshEvent) event);
}
}
public void handle(ApplicationReadyEvent event) {
this.ready.compareAndSet(false, true);
}
public void handle(RefreshEvent event) {
if (this.ready.get()) { // don't handle events before app is ready
log.debug("Event received " + event.getEventDesc());
Set keys = this.refresh.refresh();
log.info("Refresh keys changed: " + keys);
}
}
}