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By Richard Monson-Haefel, David Chappell
This booklet is an intensive advent to Java Message carrier (JMS) from sunlight Microsystems. It indicates tips on how to construct functions utilizing the point-to-point and publish-andsubscribe types; use positive factors like transactions and sturdy subscriptions to make purposes trustworthy; and use messaging inside of firm JavaBeans. It additionally introduces a brand new EJB variety, the MessageDrivenBean, that's a part of EJB 2.0, and discusses integration of messaging into J2EE.
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Catch (JMSException jmse){ ... } The ObjectMessage is the most modern of message types. In order for this message type to be useful, however, the consumers and producers of the message must be Java programs. 3 IIOP protocol, which can handle ObjectMessage types consumed by non-Java, non-JMS clients. The class definition of the object payload has to be available to both the JMS producer and JMS consumer. ClassNotFoundException. Some JMS providers may provide dynamic class loading capabilities, but that would be a vendor-specific quality of service.
If the business scenario requires a simple notification without a payload, then the lightweight Message type is the most efficient way to implement it. String as its payload. jms; public interface TextMessage extends Message { public String getText( ) throws JMSException; public void setText(String payload) throws JMSException, MessageNotWriteableException; } Text messages can be created with one of two factory methods defined in the Session interface. One factory method takes no arguments, resulting in a TextMessage object with an empty payload - the payload is added using the setText( ) method defined in the TextMessage interface.
Publish(message); ); As an application specific-property, username is not meaningful outside the Chat application; it is used exclusively by the application to filter messages based on the identity of the publisher. Property values can be any boolean, byte, short, int, long, float, double, or String. Message interface provides accessor and mutator methods for each of these property value types. jms; public interface Message { public String getStringProperty(String name) throws JMSException, MessageFormatException; public void setStringProperty(String name, String value) throws JMSException, MessageNotWriteableException; public int getIntProperty(String name) throws JMSException, MessageFormatException; public void setIntProperty(String name, int value) throws JMSException, MessageNotWriteableException; public boolean getBooleanProperty(String name) throws JMSException, MessageFormatException; public void setBooleanProperty(String name, boolean value) throws JMSException, MessageNotWriteableException; public double getDoubleProperty(String name) throws JMSException, MessageFormatException; public void setDoubleProperty(String name, double value) throws JMSException, MessageNotWriteableException; public float getFloatProperty(String name) throws JMSException, MessageFormatException; 38 Java Message Service public void setFloatProperty(String name, float value) throws JMSException, MessageNotWriteableException; public byte getByteProperty(String name) throws JMSException, MessageFormatException; public void setByteProperty(String name, byte value) throws JMSException, MessageNotWriteableException; public long getLongProperty(String name) throws JMSException, MessageFormatException; public void setLongProperty(String name, long value) throws JMSException, MessageNotWriteableException; public short getShortProperty(String name) throws JMSException, MessageFormatException; public void setShortProperty(String name, short value) throws JMSException, MessageNotWriteableException; public Object getObjectProperty(String name) throws JMSException, MessageFormatException; public void setObjectProperty(String name, Object value) throws JMSException, MessageNotWriteableException; public void clearProperties( ) throws JMSException; public Enumeration getPropertyNames( ) throws JMSException; public boolean propertyExists(String name) throws JMSException; ...