Java Message Service Broker

[Putul-Doll]

JMS has been integrated into the J2EE platform from version 1.3 , but there is no official implementation of this API prior to version 1.3 of J2EE. JMS can be used with earlier versions but it requires the use of an external tool that implements the API. The message broker or MOM ( Message Oriented Middleware ) ensure the exchange of messages between two components named customers. These exchanges can take place in a domestic setting ( for EAI ) or an external environment ( for B2B ). Can any body know moreabout about the Java Message Service Broker? Please help.

[MindSpace]

The two clients do not exchange messages directly , a client sending a message and the receiving client must request the receipt of the message. The transfer of the message and its persistence is provided by the broker.
The message exchanges are:
* asynchronous:
* reliable : messages are delivered only once and

[Zecho]

MOMs are the only way to make an exchange of asynchronous messages . They can also be very useful for the synchronous exchange of messages rather than using other more complicated mechanisms to implement (sockets , RMI , CORBA ...). The message broker can operate in two modes :
* the point to point ( point to point)
* how publish / subscribe ( publish / subscribe ).

[opaper]

The messages are encapsulated in an object type javax.jms.Message : they are required to implement the Message interface or one of those subclasses. A message consists of three parts :

* The header ( header ) : contains technical data
* The properties ( properties ) : Contains Functional Data
* Message body ( body ) : contains the message data

[Reegan]

The Session interface provides several methods createXXXMessage () to create messages containing data in the format XXX . There are also interfaces for each format girls Interface Message :

* BytesMessage : message consists of bytes
* MapMessage : message consisting of key / value pair
* ObjectMessage : message containing a serialized object
* StreamMessage : message from a stream
* TextMessage : message containing the text

[absolute55]

The syntax of the JMS Message Selector is a subset of the SQL standard. In addition , it is not possible to make selection on the payload of the message ( or payload data ) .The JMS Message Selector can make selections on the following fields in the Header :
JMSDeliveryMode , JMSPriority , JMSMessageID , JMSCorrelationID , and JMSType JMSTimestamp.