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JMS can participate in transactions with other J2EE services such as EJB In addition to this capability, JMS can also provide transactional support within aJMS session When JMS participates in a transaction that goes beyond the scope of a JMS session, the transactional support of JMS cannot be used since the whole transaction is handled by the Java Transaction API (JTA) AJMS transaction is one that is considered a single unit from the moment a message is produced to when it is consumed Transacted messages are buffered until committed For messages that have been consumed, an acknowledgement will not be issued until a commit has occurred For messages that are produced, they will not be sent to the WebLogic server until the transaction commits Transactions can rollback If this happens, the consumed messages are recovered and the produced messages are destroyed When a rollback is performed a session is recovered That is, a session will be stopped and restarted with the first unacknowledged message Transactions in JMS transacted sessions are chained; once a transaction has been committed or rolled back, another transaction begins automatically When a session is transacted, message acknowledgement is automatic If a session is not transacted there are three options that define the condition under which the session will acknowledge the receipt of a message to the JMS server: Q DUP_OK_ACKNOWLEDGE - The session will acknowledge the delivery of messages, but it is lazy If the JMS server fails there is a possibility of delivering some duplicate messages Use this option only if the consumer can handle duplicate messages This is the option with the lowest overhead, as the session does not have to work on preventing duplicates AUTO_ACKNOWLEDGE - The session will automatically acknowledge the receipt of the message when the consumer has completed the execution of the receive () method, in the synchronous case, or the asynchronous message handler CLIENT_ACKNOWLEDGE - The client is responsible for acknowledging the receipt of a message The client uses the acknowledge () method of the message object to do this Calling this method will acknowledge all consumed messages that have not been acknowledged.

or each request from a Web client, the Web server must return to the client an HTTP status code, which consists of a three-digit number A Web client can attempt to understand the server s response by looking at this status code, sent in the HTTP Status-Line header The code is accompanied by a short phrase, called a reason phrase, which is intended to provide a brief explanation for the user For example, an HTTP Status-Line header might look like this:

Here, 404 is the status code and Not Found is the reason phrase On a typical Web client, a Web browser will display the Not Found phrase in the browser window Five different classes of status codes are available from the latest HTTP 11 specifications; these classes are discussed in the following sections

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When talking about producers and consumers, there are a couple of special cases that have to be considered in the Publish and Subscribe model Topic Subscribers can be durable or non-durable A nondurable Topic Subscriber will only receive messages sent when its session is active; the subscriber will never see any other messages A durable Topic Subscriber will receive all the messages it is subscribed to, even those that are sent while its session is not active The latter will be received when the session becomes active again The WebLogic server stores messages in a database until the message has been delivered to all durable subscribers or it has expired according to the predefined lifetime of the message A special note has to be made regarding multithreading When using JMS API the session, message producer, and message consumer objects cannot be used concurrently JMS Connections, connection factories, and destinations can be used in a multithreaded fashion

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Informational Status Codes (100 199)

To summarize, the steps required for a client to set up a connection with a JMS server are the following: Q Use JNDI to locate a Connection Factory object Q Use the Connection Factory to create a Connection to the server Q Use the Connection to create one or more Sessions Q Use JNDI to locate one or more Destination objects Q Use the Sessions and Destinations to create the Message Producers and Message Consumers as needed

The purpose of this type of status code is to let the client know that the server is in the process of fulfilling a request These status codes are only informational; the client does not have to act on any of them Note that HTTP 10 does not define 1xx status codes, so 1xx status codes must not be sent to HTTP 10 clients The currently defined 1xx status codes are:

100 Continue The server sends this code to let the client know it is ready to receive the rest of the request 101 Switching Protocols The server sends this code when it is willing to switch the application protocol

Independent of which model is used, within JMS the messages are the same A JMS message consists of three parts: Header, Property Fields, and Body

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to one specified in an Upgrade request header provided by the client Switching should take place only if the new protocol provides an advantage over the existing one For example, the client may request that the server use a newer HTTP protocol than what it is currently using In such a case, the server should switch if possible

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