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Chapter 1. OpenWire over TCP
URI syntax
A vanilla TCP URI has the syntax shown in Example 1.1, “Syntax for a vanilla TCP Connection”.
Example 1.1. Syntax for a vanilla TCP Connection
tcp://Host[:Port]?transportOptions
An NIO URI has the syntax shown in Example 1.2, “Syntax for NIO Connection”.
Example 1.2. Syntax for NIO Connection
nio://Host[:Port]?transportOptions
Setting transport options
OpenWire transport options, transportOptions, are specified as a list of matrix parameters. How you specify the options to use differs between a client-side URI and a broker-side URI:
- When using a URI to open a connection between a client and a broker, you just specify the name of the option as shown.
Example 1.3. Setting an Option on a Client-Side TCP URI
tcp://fusesource.com:61616?trace=true - When using a URI to open a broker listener socket, you prefix the option name with
transport.as shown.Example 1.4. Specifying Transport Options for a Listener Socket
tcp://fusesource.com:61616?transport.trace=true - When using a URI to open a broker connection socket, you just specify the name of the option as shown.
Example 1.5. Setting an Option on a Client-Side TCP URI
tcp://fusesource.com:61616?trace=true
Important
In XML configuration, you must escape the
& symbol, replacing it with & as shown.
Example 1.6. Transport Options in XML
?option=value&option=value&...
Transport options
Table 1.1, “TCP and NIO Transport Options” shows the options supported by the TCP and the NIO URIs.
| Option | Default | Description |
|---|---|---|
minmumWireFormatVersion | 0 | Specifies the minimum wire format version that is allowed. |
trace | false | Causes all commands sent over the transport to be logged. |
daemon | false | Specifies whether the transport thread runs as a daemon or not. Useful to enable when embedding in a Spring container or in a web container, to allow the container to shut down properly. |
useLocalHost | true | When true, causes the local machine's name to resolve to localhost. |
socketBufferSize | 64*1024 | Sets the socket buffer size in bytes. |
keepAlive | false | When true, enables TCP KeepAlive on the broker connection. Useful to ensure that inactive consumers do not time out. |
soTimeout | 0 | Specifies, in milliseconds, the socket timeout. |
soWriteTimeout | 0 | Specifies, in milliseconds, the timeout for socket write operations. |
connectionTimeout | 30000 | Specifies, in milliseconds, the connection timeout. Zero means wait forever for the connection to be established. |
closeAsync | true | The false value causes all sockets to be closed synchronously. |
soLinger | MIN_INTEGER | When > -1, enables the SoLinger socket option with this value. When equal to -1, disables SoLinger. |
maximumConnections | MAX_VALUE | The maximum number of sockets the broker is allowed to create. |
diffServ | 0 | (Client only) The preferred Differentiated Services traffic class to be set on outgoing packets, as described in RFC 2475. Valid integer values are [0,64). Valid string values are EF, AF[1-3][1-4] or CS[0-7]. With JDK 6, only works when the Java Runtime uses the IPv4 stack, which can be done by setting the java.net.preferIPv4Stack system property to true. Cannot be used at the same time as the typeOfService option. |
typeOfService | 0 | (Client only) The preferred type of service value to be set on outgoing packets. Valid integer values are [0,256). With JDK 6, only works when the Java Runtime uses the IPv4 stack, which can be done by setting the java.net.preferIPv4Stack system property to true. Cannot be used at the same time as the diffServ option. |
wireFormat | The name of the wire format to use. | |
wireFormat.* | All the properties with this prefix are used to configure the wireFormat. See Table A.1, “Wire Format Options Supported by OpenWire Protocol” for more information. | |
jms.* | All the properties with this prefix are used to configure client connections to a broker. See Appendix B, Client Connection Options for more information. |
