Using ActiveMQ > Configuring Transports > ActiveMQ Connection URIs > Configuring Wire Format
OpenWire is the default wire format used by ActiveMQ. It provides a highly efficient binary format for high speed messaging. OpenWire options can be configured on a JMS client‘s connection URI or on a broker’s transport bind URI.
| Option | Default | Description |
|---|---|---|
cacheEnabled | true | Should commonly repeated values be cached so that less marshaling occurs? |
cacheSize | 1024 | When cacheEnabled=true then this parameter is used to specify the number of values to be cached. |
maxInactivityDuration | 30000 | The maximum inactivity duration (before which the socket is considered dead) in milliseconds. On some platforms it can take a long time for a socket to die. Therefore allow the broker to kill connections when they have been inactive for the configured period of time. Used by some transports to enable a keep alive heart beat feature. Inactivity monitoring is disabled when set to a value <= 0. |
maxInactivityDurationInitalDelay | 10000 | The initial delay before starting inactivity checks. Yes, the word 'Inital' is supposed to be misspelled like that. |
maxFrameSize | MAX_LONG | Maximum allowed frame size. Can help help prevent OOM DOS attacks. |
sizePrefixDisabled | false | Should the size of the packet be prefixed before each packet is marshaled? |
stackTraceEnabled | true | Should the stack trace of exception that occur on the broker be sent to the client? |
tcpNoDelayEnabled | true | Does not affect the wire format, but provides a hint to the peer that TCP_NODELAY should be enabled on the communications Socket. |
tightEncodingEnabled | true | Should wire size be optimized over CPU usage? |
Use the Correct Prefix!
Wire format options must have the prefix
wireFormat.to take effect, e.g.,wireFormat.maxInactivityDuration=10000. Options missing this prefix will be ignored.
Java:
ActiveMQConnectionFactory cf = new ActiveMQConnectionFactory("tcp://localhost:61616?wireFormat.cacheEnabled=false&wireFormat.tightEncodingEnabled=false");
Spring:
<bean class="org.apache.activemq.ActiveMQConnectionFactory"> <property name="brokerURL" value="failover:(tcp://localhost:61616?jms.optimizeAcknowledge=false&wireFormat.maxInactivityDuration=30000)"/> <!-- other options... --> </bean>