All Known Subinterfaces:

PagedReference

All Known Implementing Classes:

GroupFirstMessageReference, MessageReferenceImpl, PagedReferenceImpl, QueryPagedReferenceImpl
```
public interface MessageReference
```
A reference to a message. Channels store message references rather than the messages themselves.

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static class MessageReference.Factory

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`void`	`acknowledge()`
`void`	`acknowledge(Transaction tx)`
`void`	`acknowledge(Transaction tx, AckReason reason, ServerConsumer consumer)`
`void`	`acknowledge(Transaction tx, ServerConsumer consumer)`
`MessageReference`	`copy(Queue queue)`
`void`	`decrementDeliveryCount()`
`void`	`emptyConsumerID()`
`long`	`getConsumerId()`
`int`	`getDeliveryCount()`
`SimpleString`	`getLastValueProperty()`
`Message`	`getMessage()`
`long`	`getMessageID()`
`int`	`getMessageMemoryEstimate()`	We define this method aggregation here because on paging we need to hold the original estimate, so we need to perform some extra steps on paging.
`int`	`getPersistedCount()`
`long`	`getPersistentSize()`	This is the size of the message when persisted on disk which is used for metrics tracking Note that even if the message itself is not persisted on disk (ie non-durable) this value is still used for metrics tracking for the amount of data on a queue
`Object`	`getProtocolData()`	To be used on holding protocol specific data during the delivery.
`Queue`	`getQueue()`
`long`	`getScheduledDeliveryTime()`
`void`	`handled()`
`boolean`	`hasConsumerId()`
`void`	`incrementDeliveryCount()`
`boolean`	`isAlreadyAcked()`
`boolean`	`isDurable()`
`boolean`	`isInDelivery()`
`boolean`	`isPaged()`
`void`	`onDelivery(Consumer<? super MessageReference> callback)`	This is to be used in cases where a message delivery happens on an executor.
`void`	`setAlreadyAcked()`
`void`	`setConsumerId(long consumerID)`
`void`	`setDeliveryCount(int deliveryCount)`
`void`	`setInDelivery(boolean alreadyDelivered)`
`void`	`setPersistedCount(int deliveryCount)`
`void`	`setProtocolData(Object data)`	To be used on holding protocol specific data during the delivery.
`void`	`setScheduledDeliveryTime(long scheduledDeliveryTime)`
`default boolean`	`skipDelivery()`

- Method Detail
  - skipDelivery
```
default boolean skipDelivery()
```
  - isPaged
```
boolean isPaged()
```
  - getMessage
```
Message getMessage()
```
  - getMessageID
```
long getMessageID()
```
  - isDurable
```
boolean isDurable()
```
  - getLastValueProperty
```
SimpleString getLastValueProperty()
```
  - onDelivery
```
void onDelivery(Consumer<? super MessageReference> callback)
```
    This is to be used in cases where a message delivery happens on an executor. Most MessageReference implementations will allow execution, and if it does, and the protocol requires an execution per message, this callback may be used. At the time of this implementation only AMQP was used.
  - getMessageMemoryEstimate
```
int getMessageMemoryEstimate()
```
    We define this method aggregation here because on paging we need to hold the original estimate, so we need to perform some extra steps on paging.
    
    Returns:
  - getProtocolData
```
Object getProtocolData()
```
    To be used on holding protocol specific data during the delivery. This will be only valid while the message is on the delivering queue at the consumer
  - setProtocolData
```
void setProtocolData(Object data)
```
    To be used on holding protocol specific data during the delivery. This will be only valid while the message is on the delivering queue at the consumer
  - copy
```
MessageReference copy(Queue queue)
```
  - getScheduledDeliveryTime
```
long getScheduledDeliveryTime()
```
    Returns:
    
    The time in the future that delivery will be delayed until, or zero if no scheduled delivery will occur
  - setScheduledDeliveryTime
```
void setScheduledDeliveryTime(long scheduledDeliveryTime)
```
  - getDeliveryCount
```
int getDeliveryCount()
```
  - setDeliveryCount
```
void setDeliveryCount(int deliveryCount)
```
  - setPersistedCount
```
void setPersistedCount(int deliveryCount)
```
  - getPersistedCount
```
int getPersistedCount()
```
  - incrementDeliveryCount
```
void incrementDeliveryCount()
```
  - decrementDeliveryCount
```
void decrementDeliveryCount()
```
  - getQueue
```
Queue getQueue()
```
  - acknowledge
```
void acknowledge()
          throws Exception
```
    Throws:
    
    Exception
  - acknowledge
```
void acknowledge(Transaction tx)
          throws Exception
```
    Throws:
    
    Exception
  - acknowledge
```
void acknowledge(Transaction tx,
                 ServerConsumer consumer)
          throws Exception
```
    Throws:
    
    Exception
  - acknowledge
```
void acknowledge(Transaction tx,
                 AckReason reason,
                 ServerConsumer consumer)
          throws Exception
```
    Throws:
    
    Exception
  - emptyConsumerID
```
void emptyConsumerID()
```
  - setConsumerId
```
void setConsumerId(long consumerID)
```
  - hasConsumerId
```
boolean hasConsumerId()
```
  - getConsumerId
```
long getConsumerId()
```
  - handled
```
void handled()
```
  - setInDelivery
```
void setInDelivery(boolean alreadyDelivered)
```
  - isInDelivery
```
boolean isInDelivery()
```
  - setAlreadyAcked
```
void setAlreadyAcked()
```
  - isAlreadyAcked
```
boolean isAlreadyAcked()
```
  - getPersistentSize
```
long getPersistentSize()
                throws ActiveMQException
```
    This is the size of the message when persisted on disk which is used for metrics tracking Note that even if the message itself is not persisted on disk (ie non-durable) this value is still used for metrics tracking for the amount of data on a queue
    
    Returns:
    
    Throws:
    
    ActiveMQException

Interface MessageReference

Nested Class Summary

Method Summary

Method Detail

skipDelivery

isPaged

getMessage

getMessageID

isDurable

getLastValueProperty

onDelivery

getMessageMemoryEstimate

getProtocolData

setProtocolData

copy

getScheduledDeliveryTime

setScheduledDeliveryTime

getDeliveryCount

setDeliveryCount

setPersistedCount

getPersistedCount

incrementDeliveryCount

decrementDeliveryCount

getQueue

acknowledge

acknowledge

acknowledge

acknowledge

emptyConsumerID

setConsumerId

hasConsumerId

getConsumerId

handled

setInDelivery

isInDelivery

setAlreadyAcked

isAlreadyAcked

getPersistentSize