Chapter 6. Interoperability

6.1. 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 JavaScript 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.

JavaScript has fewer native types than AMQP can encode. To send messages containing specific AMQP types, use the wrap_ functions from the rhea/types.js module.

Table 6.1. AMQ JavaScript and AMQP Types
AMQ JavaScript Type	AMQP Type	Description
`null`	null	An empty value
`boolean`	boolean	A true or false value
`string`	string	A sequence of Unicode characters
`wrap_binary(string)`	binary	A sequence of bytes
`wrap_byte(number)`	byte	A signed 8-bit integer
`wrap_short(number)`	short	A signed 16-bit integer
`wrap_int(number)`	int	A signed 32-bit integer
`wrap_long(number)`	long	A signed 64-bit integer
`wrap_ubyte(number)`	ubyte	An unsigned 8-bit integer
`wrap_ushort(number)`	ushort	An unsigned 16-bit integer
`wrap_uint(number)`	uint	An unsigned 32-bit integer
`wrap_ulong(number)`	ulong	An unsigned 64-bit integer
`wrap_float(number)`	float	A 32-bit floating point number
`wrap_double(number)`	double	A 64-bit floating point number
`wrap_array(Array, code)`	array	A sequence of values of a single type
`wrap_list(Array)`	list	A sequence of values of variable type
`wrap_map(object)`	map	A mapping from distinct keys to values
`wrap_symbol(string)`	symbol	A 7-bit ASCII string from a constrained domain
`wrap_timestamp(number)`	timestamp	An absolute point in time

Table 6.2. AMQ JavaScript and Other AMQ Client Types
AMQ JavaScript	AMQ C++	AMQ Python	AMQ .NET
`null`	`nullptr`	`None`	`null`
`boolean`	`bool`	`bool`	`System.Boolean`
`string`	`std::string`	`unicode`	`System.String`
`wrap_binary(string)`	`proton::binary`	`bytes`	`System.Byte[]`
`wrap_byte(number)`	`int8_t`	`proton.byte`	`System.SByte`
`wrap_short(number)`	`int16_t`	`proton.short`	`System.Int16`
`wrap_int(number)`	`int32_t`	`proton.int32`	`System.Int32`
`wrap_long(number)`	`int64_t`	`long`	`System.Int64`
`wrap_ubyte(number)`	`uint8_t`	`proton.ubyte`	`System.Byte`
`wrap_ushort(number)`	`uint16_t`	`proton.ushort`	`System.UInt16`
`wrap_uint(number)`	`uint32_t`	`proton.uint`	`System.UInt32`
`wrap_ulong(number)`	`uint64_t`	`proton.ulong`	`System.UInt64`
`wrap_float(number)`	`float`	`proton.float32`	`System.Single`
`wrap_double(number)`	`double`	`float`	`System.Double`
`wrap_array(Array, code)`	-	`proton.Array`	-
`wrap_list(Array)`	`std::vector`	`list`	`Amqp.List`
`wrap_map(object)`	`std::map`	`dict`	`Amqp.Map`
`wrap_symbol(string)`	`proton::symbol`	`proton.symbol`	`Amqp.Symbol`
`wrap_timestamp(number)`	`proton::timestamp`	`proton.timestamp`	`System.DateTime`

6.2. 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 JavaScript 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 6.3. AMQ JavaScript and JMS Message Types
AMQ JavaScript Body Type	JMS Message Type
`string`	`TextMessage`
`null`	`TextMessage`
`wrap_binary(string)`	`BytesMessage`
Any other type	`ObjectMessage`

6.3. 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 Configuring Network Access.
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.

6.4. 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.

6.1. Interoperating with Other AMQP Clients

6.2. Interoperating with AMQ JMS

JMS Message Types

6.3. Connecting to AMQ Broker

6.4. Connecting to AMQ Interconnect

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