May 2009
Intermediate to advanced
330 pages
10h 34m
English
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Appendix C. Message Properties
Message properties are additional headers that can be assigned to a
message. They provide the application developer or JMS vendor with the
ability to attach more information to a message. The Message interface provides several accessor and
mutator methods for reading and writing properties. Properties can have a
String value, or one of several
primitive (boolean, byte, short,
int, long, float,
double) values. The naming of
properties, together with their values and conversion rules, are strictly
defined by JMS.
Property Names
Properties are name-value pairs. The name, called the identifier,
can be just about any String that is
a valid identifier in the Java language. With a couple of exceptions,
the rules that apply to naming a property are the same as those that
apply to the naming of variables. One difference between a JMS property
name and a Java variable name is that a property name can be any length.
In addition, property names are prohibited from using one of the message
selector reserved words. These words include NOT, AND,
OR, BETWEEN, LIKE, IN,
IS, NULL, TRUE,
and FALSE.
The property names used in JMS-defined properties and
provider-specific properties use predefined prefixes. These prefixes
(JMSX and JMS_) may not be used for application
property names.
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