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Generate QR Code in Font A SURVEY OF COMMERCIAL SYSTEMS

CHAPTER 5 A SURVEY OF COMMERCIAL SYSTEMS
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JMS doesn t support a disconnected model for clients, because clients don t have their own local queues. The JMS server implements all queues, so if clients disconnect from the server, they lose access to all queues. Clients access their queues through a lightweight API, so JMS clients incur little overhead when incorporating messaging. Although generic disconnected clients aren t supported, there is support for a special kind of disconnected scenario based on something called durable subscribers. The idea is to allow producers to continue sending messages to consumers that are temporarily disconnected. Consumers register with the server as durable subscribers if they want the server to buffer their messages while they are temporarily disconnected. When the JMS server receives messages destined to disconnected durable subscribers, the server puts the messages in a persistent store. When the consumer reconnects, it is sent all the filtered topic-based messages posted to the recipient s queue while the consumer was disconnected.
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Interoperability
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The JMS specification doesn t define a way to support interoperability directly with non-Java systems. Since JMS delivers messages solely using procedure calls, only Java clients are supported. A bridging component is necessary at the provider level to allow JMS to interoperate with non-Java clients. The task of creating a bridge between JMS servers or between JMS and non-Java messaging systems is left for vendors to implement.
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Interfaces
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The only way to interact with a JMS system is via its Java interfaces, making JMS reachable only by Java components. Internet access, using protocols such as HTTP and SOAP, is not defined in the JMS specification. Vendors are left the task of implementing their own strategies for accessing JMS using Web or Internet protocols.
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Message Structure
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All JMS messages are serialized Java objects of type javax.jms.Message. The basic structure of a JMS message is shown in Figure 5-39.
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JMS Message Header Properties Body Properties Standard Properties Provider Properties Custom Properties
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Figure 5-39. The basic layout of JMS messages The Message class interface contains methods for accessing all three parts of the message. The message fields are defined as follows: Header: This field contains information regarding how to deliver the message, including QoS settings. Properties: This area contains a list of name-value properties. Standard properties are used to identify sender and recipient information, such as the sender s UserID and GroupID. Provider properties contain provider-specific properties. Custom properties hold name-pair values defined by the message sender.
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CHAPTER 5 A SURVEY OF COMMERCIAL SYSTEMS
Body: This field contains the actual payload of the message and can contain text, byte arrays, or other entities, depending on the message type being used. To support commonly used types, JMS defines the following specialized message classes: TextMessage: The message carries a string payload. BytesMessage: The message carries a byte-array payload. MapMessage: The message carries a list of name-value pairs. StreamMessage: The message contains a stream of values. ObjectMessage: The message contains a serialized Java object. The message types are part of a standard message hierarchy shown in Figure 5-40.
interface Message
interface TextMessage
interface BytesMessage
interface interface MapMessage StreamMessage
interface ObjectMessage
Figure 5-40. The type space of JMS message payloads The sender creates a message that implements one of the interfaces and passes it to the JMS server in a method call. The message is serialized and sent over the wire to the server. The JMS spec doesn t define wire-specific protocols, so individual JMS providers can use any protocol they wish. Receivers can use run-time type identification (with the Java keyword instanceof) to determine the type of arriving messages.
Although JMS incorporates a number of CORBA Notification Service features, it is somewhat lighter than CORBA in its support for QoS. JMS QoS options can be set only at the message level, not at the queue level. There are no standard ways to set QoS options that apply to all messages associated with a given queue. At the message level, QoS options are specified using message properties. The following options are available: Reliability: Using the JMSDeliveryMode header field, the sender can specify whether a message should be handled persistently or not by the server. A persistent message must be kept in a safe store by the server, which promises to deliver it once-and-only-once. If a system failure occurs before the message is delivered, the server can recover it from the store and retry delivery until it succeeds. Nonpersistent messages are delivered at-most-once, so if a failure occurs before delivery, the message is lost. Priority: The sender can set the priority as a number in the range 0..9, with 9 being the highest priority. Priorities become important only when traffic starts backing up and messages can t be delivered as fast as they are sent. In these conditions, the server must try to deliver the higher priority messages first.
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