spring TransactionContextHolder 源码
spring TransactionContextHolder 代码
文件路径：/spring-tx/src/main/java/org/springframework/transaction/reactive/TransactionContextHolder.java
/*
* Copyright 2002-2019 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.transaction.reactive;
import java.util.Deque;
import org.springframework.transaction.NoTransactionException;
/**
* Mutable holder for reactive transaction {@link TransactionContext contexts}.
* This holder keeps references to individual {@link TransactionContext}s.
*
* @author Mark Paluch
* @author Juergen Hoeller
* @since 5.2
* @see TransactionContext
*/
final class TransactionContextHolder {
private final Deque<TransactionContext> transactionStack;
TransactionContextHolder(Deque<TransactionContext> transactionStack) {
this.transactionStack = transactionStack;
}
/**
* Return the current {@link TransactionContext}.
* @throws NoTransactionException if no transaction is ongoing
*/
TransactionContext currentContext() {
TransactionContext context = this.transactionStack.peek();
if (context == null) {
throw new NoTransactionException("No transaction in context");
}
return context;
}
/**
* Create a new {@link TransactionContext}.
*/
TransactionContext createContext() {
TransactionContext context = this.transactionStack.peek();
if (context != null) {
context = new TransactionContext(context);
}
else {
context = new TransactionContext();
}
this.transactionStack.push(context);
return context;
}
/**
* Check whether the holder has a {@link TransactionContext}.
* @return {@literal true} if a {@link TransactionContext} is associated
*/
boolean hasContext() {
return !this.transactionStack.isEmpty();
}
}
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