/*
* Copyright 2015-2017 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
*
* http://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.cloud.stream.binder;
import org.springframework.integration.IntegrationMessageHeaderAccessor;
import org.springframework.messaging.MessageHeaders;
/**
* Spring Integration message headers for Spring Cloud Stream.
* @author Gary Russell
* @author David Turanski
*/
public final class BinderHeaders {
private static final String PREFIX = "scst_";
/**
* Indicates the original content type of a message that has been
* transformed in a native transport format.
*/
public static final String BINDER_ORIGINAL_CONTENT_TYPE = "originalContentType";
/**
* Indicates the target partition of an outbound message.
* Binders must observe this value when sending data on the transport.
* This header is internally set by the framework when partitioning is
* configured.
* It may be overridden by {@link BinderHeaders#PARTITION_OVERRIDE} if set
* by the user.
*/
public static final String PARTITION_HEADER = PREFIX + "partition";
/**
* Indicates the target partition of an outbound message.
* Overrides any partition selected by the binder.
* This header takes precedence over {@link BinderHeaders#PARTITION_HEADER}.
*/
public static final String PARTITION_OVERRIDE = PREFIX + "partitionOverride";
/**
* The headers that will be propagated, by default, by binder implementations
* that have no inherent header support (by embedding the headers in the payload).
*/
public static final String[] STANDARD_HEADERS = new String[] {
IntegrationMessageHeaderAccessor.CORRELATION_ID,
IntegrationMessageHeaderAccessor.SEQUENCE_SIZE,
IntegrationMessageHeaderAccessor.SEQUENCE_NUMBER,
MessageHeaders.CONTENT_TYPE,
BINDER_ORIGINAL_CONTENT_TYPE
};
private BinderHeaders() {
}
}