spring PollableChannel 源码
spring PollableChannel 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/PollableChannel.java
/*
* Copyright 2002-2013 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;
import org.springframework.lang.Nullable;
/**
* A {@link MessageChannel} from which messages may be actively received through polling.
*
* @author Mark Fisher
* @since 4.0
*/
public interface PollableChannel extends MessageChannel {
/**
* Receive a message from this channel, blocking indefinitely if necessary.
* @return the next available {@link Message} or {@code null} if interrupted
*/
@Nullable
Message<?> receive();
/**
* Receive a message from this channel, blocking until either a message is available
* or the specified timeout period elapses.
* @param timeout the timeout in milliseconds or {@link MessageChannel#INDEFINITE_TIMEOUT}.
* @return the next available {@link Message} or {@code null} if the specified timeout
* period elapses or the message reception is interrupted
*/
@Nullable
Message<?> receive(long timeout);
}
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