Chapter 9. VM Transport
Abstract
The VM transport allows clients to connect to each other inside the Java Virtual Machine (JVM) without the overhead of network communication.
The URI used to specify the VM transport comes in two flavors to provide maximum control over how the embedded broker is configured:
- simple—specifies the name of the embedded broker to which the client connects and allows for some basic broker configuration
- advanced—uses a broker URI to configure the embedded broker
9.1. Simple VM URI Syntax
URI syntax
The simple VM URI is used in most situations. It allows you to specify the name of the embedded broker to which the client will connect. It also allows for some basic broker configuration.
Example 9.1, “Simple VM URI Syntax” shows the syntax for a simple VM URI.
Example 9.1. Simple VM URI Syntax
vm://BrokerName?TransportOptions
- BrokerName specifies the name of the embedded broker to which the client connects.
- TransportOptions specifies the configuration for the transport. They are specified in the form of a query list. Table 9.2, “VM Transport Options” lists the available options.
Broker options
In addition to the transport options listed in Table 9.2, “VM Transport Options”, the simple VM URI can use the options described in Table 9.1, “VM Transport Broker Configuration Options” to configure the embedded broker.
Important
The broker configuration options specified on the VM URI are only meaningful if the client is responsible for instantiating the embedded broker. If the embedded broker is already started, the transport will ignore the broker configuration properties.
Example
Example 9.2, “Basic VM URI” shows a basic VM URI that connects to an embedded broker named
broker1.
Example 9.2. Basic VM URI
vm://broker1
Example 9.3, “Simple URI with broker options” creates and connects to an embedded broker that uses a non-persistent message store.
Example 9.3. Simple URI with broker options
vm://broker1?broker.persistent=false
