February 2002
Beginner to intermediate
544 pages
10h 23m
English
book
Java™ Message Service API Tutorial and Reference: Messaging for the J2EE™ Platform
by Mark Hapner, Rich Burridge, Rahul Sharma, Joseph Fialli, Kim Haase
Content preview from Java™ Message Service API Tutorial and Reference: Messaging for the J2EE™ Platform
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15.3. Fields
Two fields are defined in the interface javax.jms.DeliveryMode.
NON_PERSISTENT
public static final int NON_PERSISTENT
This is the lowest-overhead delivery mode because it does not require that the message be logged to stable storage. The level of JMS provider failure that causes a NON_PERSISTENT message to be lost is not defined.
A JMS provider must deliver a NON_PERSISTENT message with an at-most-once guarantee. This means that it may lose the message, but it must not deliver it twice.
PERSISTENT
public static final int PERSISTENT
This delivery mode instructs the JMS provider to log the message to stable storage as part of the client's send operation. Only a hard media failure should cause a PERSISTENT message to be lost.
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