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Publishing JMX Notifications The Spring IoC container supports the beans that are going to be exported as MBeans to publish JMX notifications. These beans must implement the NotificationPublisherAware interface to get access to NotificationPublisher so that they can publish notifications. package com.apress.springrecipes.replicator; ... import javax.management.Notification; import org.springframework.jmx.export.notification.NotificationPublisher; import org.springframework.jmx.export.notification.NotificationPublisherAware; public class FileReplicatorImpl implements FileReplicator, NotificationPublisherAware { ... private int sequenceNumber; private NotificationPublisher notificationPublisher; public void setNotificationPublisher( NotificationPublisher notificationPublisher) { this.notificationPublisher = notificationPublisher; } public void replicate() throws IOException { notificationPublisher.sendNotification( new Notification("replication.start", this, sequenceNumber)); ... notificationPublisher.sendNotification( new Notification("replication.complete", this, sequenceNumber));

sequenceNumber++; } } In this file replicator, you send a JMX notification whenever a replication starts or completes. The first argument in the Notification constructor is the notification type, while the second is the notification source. Each notification requires a sequence number. You can use the same sequence for a notification pair to keep track of them. Listening to JMX Notifications Now let s create a notification listener to listen to JMX notifications. As a listener will be notified of many different types of notifications, such as AttributeChangeNotification when an MBean s attribute has changed, you have to filter those notifications that you are interested in handling. package com.apress.springrecipes.replicator; import javax.management.Notification; import javax.management.NotificationListener; public class ReplicationNotificationListener implements NotificationListener { public void handleNotification(Notification notification, Object handback) { if (notification.getType().startsWith("replication")) { System.out.println( notification.getSource() + " " + notification.getType() + " #" + notification.getSequenceNumber()); } } } Then you can register this notification listener with your MBean exporter to listen to notifications emitted from certain MBeans. <bean id="mbeanExporter" class="org.springframework.jmx.export.annotation.AnnotationMBeanExporter"> <property name="defaultDomain" value="bean" /> <property name="notificationListenerMappings"> <map> <entry key="bean:name=documentReplicator,type=FileReplicatorImpl"> <bean class="com.apress.springrecipes.replicator. ReplicationNotificationListener" /> </entry> </map> </property> </bean>

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Figure 4-2. Common implementations of the PlatformTransactionManager interface A transaction manager is declared in the Spring IoC container as a normal bean. For example, the following bean configuration declares a DataSourceTransactionManager instance. It requires the dataSource property to be set so that it can manage transactions for connections made by this data source. <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource"ref="dataSource"/> </bean>

You would like to access JMX MBeans running on a remote MBean server exposed by a JMX connector. When accessing remote MBeans directly with the JMX API, you have to write complex JMX-specific code.

You need to precisely control when to commit and roll back transactions in your business methods, but you don t want to deal with the underlying transaction API directly.

Spring offers two approaches to simplify your remote MBean access. First, it provides a factory bean for you to create an MBean server connection declaratively. With this server connection, you can query and update an MBean s attributes, as well as invoke its operations. Second, Spring provides another factory bean that allows you to create a proxy for a remote MBean. With this proxy, you can operate a remote MBean as if it were a local bean.

Spring s transaction manager provides a technology-independent API that allows you to start a new transaction (or obtain the currently active transaction) by calling the getTransaction() method and manage it by calling the commit() and rollback() methods. Because PlatformTransactionManager is an abstract unit for transaction management, the methods you called for transaction management are guaranteed to be technology independent.

Some people exhibit prodigious talent, whereas others, who may be just as motivated and hardworking, continue to struggle Moreover, individuals usually exhibit their ability in specific areas, such as detail work or client communication Barry Boehm [1981] makes the following recommendations in his seminal book Software Engineering Economics: Top talent Use better and fewer people Job matching Fit the tasks to the skills and motivation of the people available Team balance Select people who will complement and harmonize with each other A naive project manager who saw developers as equivalent to each other would be tempted to use the so-called Mongolian Horde approach, which uses a large number of cheap and inexperienced developers Just as with the original Horde, the end result is chaos Even allowing for their limited design and programming skills, the developers just don t have the experience to organize and deliver a system of this scale.

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