org.springframework.messaging

Class MessageHeaders

java.lang.Object

org.springframework.messaging.MessageHeaders

All Implemented Interfaces:

java.io.Serializable, java.util.Map<java.lang.String,java.lang.Object>

public final class MessageHeaders
extends java.lang.Object
implements java.util.Map<java.lang.String,java.lang.Object>, java.io.Serializable

The headers for a Message

IMPORTANT: This class is immutable. Any mutating operation (e.g., put(..), putAll(..) etc.) will throw UnsupportedOperationException.

To create MessageHeaders instance use fluent MessageBuilder API

 MessageBuilder.withPayload("foo").setHeader("key1", "value1").setHeader("key2", "value2");
 

or create an instance of GenericMessage passing payload as Object and headers as a regular Map

 Map headers = new HashMap();
 headers.put("key1", "value1");
 headers.put("key2", "value2");
 new GenericMessage("foo", headers);
 

Since:

4.0

Author:

Arjen Poutsma, Mark Fisher, Gary Russell, Rossen Stoyanchev

See Also:

MessageBuilder, Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MessageHeaders.AlternativeJdkIdGenerator A variation of UUID.randomUUID() that uses SecureRandom only for the initial seed and Random thereafter, which provides better performance in exchange for less securely random id's.
static interface	MessageHeaders.IdGenerator

Nested classes/interfaces inherited from interface java.util.Map

java.util.Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	CONTENT_TYPE
private static MessageHeaders.IdGenerator	defaultIdGenerator
static java.lang.String	ERROR_CHANNEL
static java.util.List<java.lang.String>	HEADER_NAMES
private java.util.Map<java.lang.String,java.lang.Object>	headers
static java.lang.String	ID The key for the Message ID.
private static MessageHeaders.IdGenerator	idGenerator
private static Log	logger
static java.lang.String	REPLY_CHANNEL
private static long	serialVersionUID
static java.lang.String	TIMESTAMP

Constructor Summary

Constructors

Constructor and Description
MessageHeaders(java.util.Map<java.lang.String,java.lang.Object> headers)

Method Summary

Modifier and Type	Method and Description
void	clear() Since MessageHeaders are immutable the call to this method will result in UnsupportedOperationException
boolean	containsKey(java.lang.Object key)
boolean	containsValue(java.lang.Object value)
java.util.Set<java.util.Map.Entry<java.lang.String,java.lang.Object>>	entrySet()
boolean	equals(java.lang.Object object)
java.lang.Object	get(java.lang.Object key)
<T> T	get(java.lang.Object key, java.lang.Class<T> type)
java.lang.Object	getErrorChannel()
java.util.UUID	getId()
java.lang.Object	getReplyChannel()
java.lang.Long	getTimestamp()
int	hashCode()
boolean	isEmpty()
java.util.Set<java.lang.String>	keySet()
java.lang.Object	put(java.lang.String key, java.lang.Object value) Since MessageHeaders are immutable the call to this method will result in UnsupportedOperationException
void	putAll(java.util.Map<? extends java.lang.String,? extends java.lang.Object> t) Since MessageHeaders are immutable the call to this method will result in UnsupportedOperationException
private void	readObject(java.io.ObjectInputStream in)
java.lang.Object	remove(java.lang.Object key) Since MessageHeaders are immutable the call to this method will result in UnsupportedOperationException
int	size()
java.lang.String	toString()
java.util.Collection<java.lang.Object>	values()
private void	writeObject(java.io.ObjectOutputStream out)

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

logger

private static final Log logger

idGenerator

private static volatile MessageHeaders.IdGenerator idGenerator

defaultIdGenerator

private static volatile MessageHeaders.IdGenerator defaultIdGenerator

ID

public static final java.lang.String ID

The key for the Message ID. This is an automatically generated UUID and should never be explicitly set in the header map except in the case of Message deserialization where the serialized Message's generated UUID is being restored.

See Also:

Constant Field Values

TIMESTAMP

public static final java.lang.String TIMESTAMP

See Also:

Constant Field Values

REPLY_CHANNEL

public static final java.lang.String REPLY_CHANNEL

See Also:

Constant Field Values

ERROR_CHANNEL

public static final java.lang.String ERROR_CHANNEL

See Also:

Constant Field Values

CONTENT_TYPE

public static final java.lang.String CONTENT_TYPE

See Also:

Constant Field Values

HEADER_NAMES

public static final java.util.List<java.lang.String> HEADER_NAMES

headers

private final java.util.Map<java.lang.String,java.lang.Object> headers

Constructor Detail

MessageHeaders

public MessageHeaders(java.util.Map<java.lang.String,java.lang.Object> headers)

Method Detail

getId

public java.util.UUID getId()

getTimestamp

public java.lang.Long getTimestamp()

getReplyChannel

public java.lang.Object getReplyChannel()

getErrorChannel

public java.lang.Object getErrorChannel()

get

public <T> T get(java.lang.Object key,
                 java.lang.Class<T> type)

hashCode

public int hashCode()

Specified by:

hashCode in interface java.util.Map<java.lang.String,java.lang.Object>

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object object)

Specified by:

equals in interface java.util.Map<java.lang.String,java.lang.Object>

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

containsKey

public boolean containsKey(java.lang.Object key)

Specified by:

containsKey in interface java.util.Map<java.lang.String,java.lang.Object>

containsValue

public boolean containsValue(java.lang.Object value)

Specified by:

containsValue in interface java.util.Map<java.lang.String,java.lang.Object>

entrySet

public java.util.Set<java.util.Map.Entry<java.lang.String,java.lang.Object>> entrySet()

Specified by:

entrySet in interface java.util.Map<java.lang.String,java.lang.Object>

get

public java.lang.Object get(java.lang.Object key)

Specified by:

get in interface java.util.Map<java.lang.String,java.lang.Object>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Map<java.lang.String,java.lang.Object>

keySet

public java.util.Set<java.lang.String> keySet()

Specified by:

keySet in interface java.util.Map<java.lang.String,java.lang.Object>

size

public int size()

Specified by:

size in interface java.util.Map<java.lang.String,java.lang.Object>

values

public java.util.Collection<java.lang.Object> values()

Specified by:

values in interface java.util.Map<java.lang.String,java.lang.Object>

put

public java.lang.Object put(java.lang.String key,
                            java.lang.Object value)

Since MessageHeaders are immutable the call to this method will result in UnsupportedOperationException

Specified by:

put in interface java.util.Map<java.lang.String,java.lang.Object>

putAll

public void putAll(java.util.Map<? extends java.lang.String,? extends java.lang.Object> t)

Since MessageHeaders are immutable the call to this method will result in UnsupportedOperationException

Specified by:

putAll in interface java.util.Map<java.lang.String,java.lang.Object>

remove

public java.lang.Object remove(java.lang.Object key)

Since MessageHeaders are immutable the call to this method will result in UnsupportedOperationException

Specified by:

remove in interface java.util.Map<java.lang.String,java.lang.Object>

clear

public void clear()

Since MessageHeaders are immutable the call to this method will result in UnsupportedOperationException

Specified by:

clear in interface java.util.Map<java.lang.String,java.lang.Object>

writeObject

private void writeObject(java.io.ObjectOutputStream out)
                  throws java.io.IOException

Throws:

java.io.IOException

readObject

private void readObject(java.io.ObjectInputStream in)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Throws:

java.io.IOException

java.lang.ClassNotFoundException