Red Hat Training

A Red Hat training course is available for Red Hat AMQ

Chapter 7. Interoperability

This chapter discusses how to use AMQ Python in combination with other AMQ components. For an overview of the compatibility of AMQ components, see the product introduction.

7.1. Interoperating with other AMQP clients

AMQP messages are composed using the AMQP type system. This common format is one of the reasons AMQP clients in different languages are able to interoperate with each other.

When sending messages, AMQ Python automatically converts language-native types to AMQP-encoded data. When receiving messages, the reverse conversion takes place.

Note

More information about AMQP types is available at the interactive type reference maintained by the Apache Qpid project.

Table 7.1. AMQP types

AMQP typeDescription

null

An empty value

boolean

A true or false value

char

A single Unicode character

string

A sequence of Unicode characters

binary

A sequence of bytes

byte

A signed 8-bit integer

short

A signed 16-bit integer

int

A signed 32-bit integer

long

A signed 64-bit integer

ubyte

An unsigned 8-bit integer

ushort

An unsigned 16-bit integer

uint

An unsigned 32-bit integer

ulong

An unsigned 64-bit integer

float

A 32-bit floating point number

double

A 64-bit floating point number

array

A sequence of values of a single type

list

A sequence of values of variable type

map

A mapping from distinct keys to values

uuid

A universally unique identifier

symbol

A 7-bit ASCII string from a constrained domain

timestamp

An absolute point in time

Table 7.2. AMQ Python types before encoding and after decoding

AMQP typeAMQ Python type before encodingAMQ Python type after decoding

null

None

None

boolean

bool

bool

char

proton.char

unicode

string

unicode

unicode

binary

bytes

bytes

byte

proton.byte

int

short

proton.short

int

int

proton.int32

long

long

long

long

ubyte

proton.ubyte

long

ushort

proton.ushort

long

uint

proton.uint

long

ulong

proton.ulong

long

float

proton.float32

float

double

float

float

array

proton.Array

proton.Array

list

list

list

map

dict

dict

symbol

proton.symbol

str

timestamp

proton.timestamp

long

Table 7.3. AMQ Python and other AMQ client types (1 of 2)

AMQ Python type before encodingAMQ C++ typeAMQ JavaScript type

None

nullptr

null

bool

bool

boolean

proton.char

wchar_t

number

unicode

std::string

string

bytes

proton::binary

string

proton.byte

int8_t

number

proton.short

int16_t

number

proton.int32

int32_t

number

long

int64_t

number

proton.ubyte

uint8_t

number

proton.ushort

uint16_t

number

proton.uint

uint32_t

number

proton.ulong

uint64_t

number

proton.float32

float

number

float

double

number

proton.Array

-

Array

list

std::vector

Array

dict

std::map

object

uuid.UUID

proton::uuid

number

proton.symbol

proton::symbol

string

proton.timestamp

proton::timestamp

number

Table 7.4. AMQ Python and other AMQ client types (2 of 2)

AMQ Python type before encodingAMQ .NET typeAMQ Ruby type

None

null

nil

bool

System.Boolean

true, false

proton.char

System.Char

String

unicode

System.String

String

bytes

System.Byte[]

String

proton.byte

System.SByte

Integer

proton.short

System.Int16

Integer

proton.int32

System.Int32

Integer

long

System.Int64

Integer

proton.ubyte

System.Byte

Integer

proton.ushort

System.UInt16

Integer

proton.uint

System.UInt32

Integer

proton.ulong

System.UInt64

Integer

proton.float32

System.Single

Float

float

System.Double

Float

proton.Array

-

Array

list

Amqp.List

Array

dict

Amqp.Map

Hash

uuid.UUID

System.Guid

-

proton.symbol

Amqp.Symbol

Symbol

proton.timestamp

System.DateTime

Time

7.2. Interoperating with AMQ JMS

AMQP defines a standard mapping to the JMS messaging model. This section discusses the various aspects of that mapping. For more information, see the AMQ JMS Interoperability chapter.

JMS message types

AMQ Python provides a single message type whose body type can vary. By contrast, the JMS API uses different message types to represent different kinds of data. The table below indicates how particular body types map to JMS message types.

For more explicit control of the resulting JMS message type, you can set the x-opt-jms-msg-type message annotation. See the AMQ JMS Interoperability chapter for more information.

Table 7.5. AMQ Python and JMS message types

AMQ Python body typeJMS message type

unicode

TextMessage

None

TextMessage

bytes

BytesMessage

Any other type

ObjectMessage

7.3. Connecting to AMQ Broker

AMQ Broker is designed to interoperate with AMQP 1.0 clients. Check the following to ensure the broker is configured for AMQP messaging.

  • Port 5672 in the network firewall is open.
  • The AMQ Broker AMQP acceptor is enabled. See Default acceptor settings.
  • The necessary addresses are configured on the broker. See Addresses, Queues, and Topics.
  • The broker is configured to permit access from your client, and the client is configured to send the required credentials. See Broker Security.

7.4. Connecting to AMQ Interconnect

AMQ Interconnect works with any AMQP 1.0 client. Check the following to ensure the components are configured correctly.

  • Port 5672 in the network firewall is open.
  • The router is configured to permit access from your client, and the client is configured to send the required credentials. See Interconnect Security.