ActiveMQ supports the AMQP 1.0 protocol which is an OASIS standard.
Availability
Available from ActiveMQ version 5.8 onward.
To enable AMQP protocol support on the broker add the following transport connector configuration referencing the amqp scheme in its URI:
<transportConnectors> <transportConnector name="amqp" uri="amqp://0.0.0.0:5672"/> </transportConnectors>
It is enabled in the default ActiveMQ server configuration. For more help see Run Broker.
The AMQP implementation fully supports an ActiveMQ security mechanism. This allows the broker to accept plain SASL authentication. Authorization policies are applied to a destination when it's accessed (read/write).
SSL
For additional security AMQP can be configured to run over SSL as described in the following section.
For better scalability (and performance) the AMQP protocol should be configured to use NIO, rather than the default of TCP. To use NIO use the transport scheme amqp+nio instead of amqp.
Example:
<transportConnector name="amqp+nio" uri="amqp+nio://localhost:5672"/>
This transport uses the NIO transport underneath and will generally use much less threads than the standard connector. This connector can help if you want to use large number of queues
It's easy to configure ActiveMQ to use AMQP over a SSL connection. To use SSL use the transport scheme amqp+ssl instead of amqp.
Example:
<transportConnector name="amqp+ssl" uri="amqp+ssl://localhost:5671"/>
For more details on using SSL with ActiveMQ, see the following article (How do I use SSL).
You should prefix destination address with queue:// to use queue based destinations or topic:// to use topic based destinations. The destination type defaults to queue when the destination prefix is omitted.
When AMQP receiver connects to the broker it‘s mapped to the JMS consumer. This JMS consumer has to have appropriate prefetch size set. The broker will honor the credit set by the client or use the default value of 1000 if client doesn’t set it.
Example: tuning the default prefetch size:
<transportConnector name="amqp" uri="amqp://0.0.0.0:5672?maximumConnections=1000&wireFormat.maxFrameSize=104857600&transport.prefetch=10"/>
In this case, client preference will be ignored and the configured value will be used.
You can also tune broker-side amqp receiver link that handles incoming messages. It will use credit of 1000 messages by default, but you can override this by using producerCredit property, like
<transportConnector name="amqp" uri="amqp://0.0.0.0:5672?maximumConnections=1000&wireFormat.maxFrameSize=104857600&transport.producerCredit=10000"/>
There are three basic conversion strategies that can be used with AMQP and inter-operating with the JMS API.
| Strategy | Description |
|---|---|
native | (Default) Wraps the bytes of the AMQP message into a JMS BytesMessage and maps the headers of the AMQP message to headers on the JMS message. |
raw | Wraps the bytes of the AMQP message into a JMS BytesMessage. |
jms | Maps headers of the AMQP message to JMS message headers and the body of the AMQP message to the JMS body. |
Set the transformer transport option on the transportConnector to the desired mapping strategy. For example, to inter-operate with JMS at the payload level, set the transformer option to jms:
<transportConnector name="amqp" uri="amqp://localhost:5672?transport.transformer=jms"/>
The following headers are mapped regardless of the transformer used:
| AMQP Message | JMS Message | Notes |
|---|---|---|
JMS_AMQP_NATIVE | Will be set to true if the transformer is native or raw, false otherwise. | |
message-format | JMS_AMQP_MESSAGE_FORMAT |
The following header mappings apply when the transformer is either native or jms:
| AMQP Message | JMS Message | Notes |
|---|---|---|
application-properties.JMSXGroupID | JMSXGroupID | |
application-properties.JMSXGroupSequence | JMSXGroupSequence | |
application-properties.JMSXUserID | JMSXUserID | |
application-properties.**name | name | |
delivery-annotations.**name | JMS_AMQP_DA_**name | |
footer.**name | JMS_AMQP_FT_**name | |
header.deliveryCount | JMSXDeliveryCount | |
header.durable | JMSDeliveryMode | javax.jms.Message.DEFAULT_DELIVERY_MODE if not set. |
header.first-acquirer | JMS_AMQP_FirstAcquirer | |
header.priority | JMSPriority | javax.jms.Message.DEFAULT_PRIORITY if not set. |
header.ttl | JMSExpiration | javax.jms.Message.DEFAULT_TIME_TO_LIVE if not set. |
message-annotations.**name | JMS_AMQP_MA_**name | |
message-annotations.x-opt-jms-type | JMSType | |
message-annotations.x-opt-reply-type | Type of the JMSReplyTo | Comma separated list of queue, topic, or temporary. Defaults to queue if not set. |
message-annotations.x-opt-to-type | Type of the JMSDestination | Comma separated list of queue, topic, or temporary. Defaults to queue if not set. |
properties.content-encoding | JMS_AMQP_ContentEncoding | |
properties.content-type | JMS_AMQP_ContentType | |
properties.correlation-id | JMSCorrelationID | |
properties.creation-time | JMSTimestamp | |
properties.group-sequence | JMSXGroupSequence | |
properties.message-id | JMSMessageID | Auto generated if not set. |
properties.reply-to | JMSReplyTo | The name of the JMSReplyTo |
properties.reply-to-group-id | JMS_AMQP_ReplyToGroupID | |
properties.subject | JMS_AMQP_Subject | |
properties.to | JMSDestination | The name of the JMSDestination |
properties.user-id | JMSXUserID | properties.user-id is decoded as a UTF-8 String. |
AMQP property value types are converted as follows:
| AMQP Type | Java Type | Notes |
|---|---|---|
binary | String | Hex encoding of the binary value |
bool | Boolean | |
byte | Byte | |
double | Double | |
float | Float | |
int | Integer | |
long | Long | |
short | Short | |
symbol | String | |
ubyte | Byte or Short | Short is used if: value > Byte.MAX_VALUE |
uint | Integer or Long | Long is used if: value > Integer.MAX_VALUE |
ulong | Long | |
ushort | Short or Integer | Integer is used if: value > Short.MAX_VALUE |
If the transformer is set to jms then the JMS message type will depend on the body type of the AMQP message.
| Body Type | JMS Message Type |
|---|---|
AmqpSequence | StreamMessage |
AmqpValue | ObjectMessage |
AmqpValue holding a null | Message |
AmqpValue holding a String | TextMessage |
AmqpValue holding a binary | BytesMessage |
AmqpValue holding a list | StreamMessage |
Data | BytesMessage |
null | Message |
You can use Apache Qpid Proton.