spring MessageReceivingOperations 源码
spring MessageReceivingOperations 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/core/MessageReceivingOperations.java
/*
* Copyright 2002-2018 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.messaging.core;
import org.springframework.lang.Nullable;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessagingException;
/**
* Operations for receiving messages from a destination.
*
* @author Mark Fisher
* @author Rossen Stoyanchev
* @since 4.0
* @param <D> the type of destination
* @see GenericMessagingTemplate
*/
public interface MessageReceivingOperations<D> {
/**
* Receive a message from a default destination.
* @return the received message, possibly {@code null} if the message could not
* be received, for example due to a timeout
*/
@Nullable
Message<?> receive() throws MessagingException;
/**
* Receive a message from the given destination.
* @param destination the target destination
* @return the received message, possibly {@code null} if the message could not
* be received, for example due to a timeout
*/
@Nullable
Message<?> receive(D destination) throws MessagingException;
/**
* Receive a message from a default destination and convert its payload to the
* specified target class.
* @param targetClass the target class to convert the payload to
* @return the converted payload of the reply message, possibly {@code null} if
* the message could not be received, for example due to a timeout
*/
@Nullable
<T> T receiveAndConvert(Class<T> targetClass) throws MessagingException;
/**
* Receive a message from the given destination and convert its payload to the
* specified target class.
* @param destination the target destination
* @param targetClass the target class to convert the payload to
* @return the converted payload of the reply message, possibly {@code null} if
* the message could not be received, for example due to a timeout
*/
@Nullable
<T> T receiveAndConvert(D destination, Class<T> targetClass) throws MessagingException;
}
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