spring TransactionalApplicationListenerSynchronization 源码
spring TransactionalApplicationListenerSynchronization 代码
文件路径：/spring-tx/src/main/java/org/springframework/transaction/event/TransactionalApplicationListenerSynchronization.java
/*
* Copyright 2002-2020 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.transaction.event;
import java.util.List;
import org.springframework.context.ApplicationEvent;
import org.springframework.transaction.support.TransactionSynchronization;
/**
* {@link TransactionSynchronization} implementation for event processing with a
* {@link TransactionalApplicationListener}.
*
* @author Juergen Hoeller
* @since 5.3
* @param <E> the specific {@code ApplicationEvent} subclass to listen to
*/
class TransactionalApplicationListenerSynchronization<E extends ApplicationEvent>
implements TransactionSynchronization {
private final E event;
private final TransactionalApplicationListener<E> listener;
private final List<TransactionalApplicationListener.SynchronizationCallback> callbacks;
public TransactionalApplicationListenerSynchronization(E event, TransactionalApplicationListener<E> listener,
List<TransactionalApplicationListener.SynchronizationCallback> callbacks) {
this.event = event;
this.listener = listener;
this.callbacks = callbacks;
}
@Override
public int getOrder() {
return this.listener.getOrder();
}
@Override
public void beforeCommit(boolean readOnly) {
if (this.listener.getTransactionPhase() == TransactionPhase.BEFORE_COMMIT) {
processEventWithCallbacks();
}
}
@Override
public void afterCompletion(int status) {
TransactionPhase phase = this.listener.getTransactionPhase();
if (phase == TransactionPhase.AFTER_COMMIT && status == STATUS_COMMITTED) {
processEventWithCallbacks();
}
else if (phase == TransactionPhase.AFTER_ROLLBACK && status == STATUS_ROLLED_BACK) {
processEventWithCallbacks();
}
else if (phase == TransactionPhase.AFTER_COMPLETION) {
processEventWithCallbacks();
}
}
private void processEventWithCallbacks() {
this.callbacks.forEach(callback -> callback.preProcessEvent(this.event));
try {
this.listener.processEvent(this.event);
}
catch (RuntimeException | Error ex) {
this.callbacks.forEach(callback -> callback.postProcessEvent(this.event, ex));
throw ex;
}
this.callbacks.forEach(callback -> callback.postProcessEvent(this.event, null));
}
}
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