spring IdTimestampMessageHeaderInitializer 源码
spring IdTimestampMessageHeaderInitializer 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/support/IdTimestampMessageHeaderInitializer.java
/*
* Copyright 2002-2017 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.support;
import org.springframework.lang.Nullable;
import org.springframework.messaging.MessageHeaders;
import org.springframework.util.IdGenerator;
/**
* A {@link org.springframework.messaging.support.MessageHeaderInitializer MessageHeaderInitializer}
* to customize the strategy for ID and TIMESTAMP message header generation.
*
* @author Rossen Stoyanchev
* @since 4.1
*/
public class IdTimestampMessageHeaderInitializer implements MessageHeaderInitializer {
private static final IdGenerator ID_VALUE_NONE_GENERATOR = () -> MessageHeaders.ID_VALUE_NONE;
@Nullable
private IdGenerator idGenerator;
private boolean enableTimestamp;
/**
* Configure the IdGenerator strategy to initialize {@code MessageHeaderAccessor}
* instances with.
* <p>By default this property is set to {@code null} in which case the default
* IdGenerator of {@link org.springframework.messaging.MessageHeaders} is used.
* <p>To have no ids generated at all, see {@link #setDisableIdGeneration()}.
*/
public void setIdGenerator(@Nullable IdGenerator idGenerator) {
this.idGenerator = idGenerator;
}
/**
* Return the configured {@code IdGenerator}, if any.
*/
@Nullable
public IdGenerator getIdGenerator() {
return this.idGenerator;
}
/**
* A shortcut for calling {@link #setIdGenerator} with an id generation strategy
* to disable id generation completely.
*/
public void setDisableIdGeneration() {
this.idGenerator = ID_VALUE_NONE_GENERATOR;
}
/**
* Whether to enable the automatic addition of the
* {@link org.springframework.messaging.MessageHeaders#TIMESTAMP} header on
* {@code MessageHeaderAccessor} instances being initialized.
* <p>By default this property is set to false.
*/
public void setEnableTimestamp(boolean enableTimestamp) {
this.enableTimestamp = enableTimestamp;
}
/**
* Return whether the timestamp header is enabled or not.
*/
public boolean isEnableTimestamp() {
return this.enableTimestamp;
}
@Override
public void initHeaders(MessageHeaderAccessor headerAccessor) {
IdGenerator idGenerator = getIdGenerator();
if (idGenerator != null) {
headerAccessor.setIdGenerator(idGenerator);
}
headerAccessor.setEnableTimestamp(isEnableTimestamp());
}
}
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