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The GEvent object, introduced in 3, lets you run code when specific events are triggered on particular objects. You can attach events to markers, the map, DOM objects, info windows, overlays, and any other object on your map. In earlier chapters, you ve used the click event to create markers and the zoomend event to load data from the server. These work great if your users are interacting with the map, but what happens if they re interacting with some other part of the web application and you want those objects to trigger these events In those cases, you can use the trigger() method of the GEvent class to force the event to run. For example, suppose you create an event that runs when the zoom level is changed on your map using the zoomend event, and it s logged to the GLog window:

transactionTemplate.execute(new TransactionCallbackWithoutResult() { protected void doInTransactionWithoutResult(TransactionStatus status) { Number newId = insertProduct.executeAndReturnKey( new BeanPropertySqlParameterSource(product)); product.setProductID(newId.intValue()); } }); } } The insertProduct() method resides in a DAO class. To make this database call transactional, we wrap the executeAndReturnkey method of the SimpleJdbcInsert call in the TransactionTemplate. Since we had no result to be returned from the query, we implemented the TransactionCallbackWithoutResult interface. If you are expecting to return data from the database call, use TransactionCallback instead. There are two ways a rollback will occur: by calling the setRollbackOnly() method on the TransactionalStatus object or by throwing an exception from the call. Otherwise, the data will be committed when the transaction completes.

GEvent.addListener(map,'zoomend',function(oldLevel, newLevel) { //some other code GLog.write('Zoom changed from ' + oldLevel + ' to ' + newLevel); }); If you adjust the zoom level of your map, you ll get a log entry that looks something like Figure 9-4.

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Spring s support for declarative transaction management is applied through the Spring AOP framework. It provides three ways to support declarative transactions. The first is to declare transactions by proxying beans using Spring AOP. This has always been supported by Spring. The other two ways were introduced with Spring 2.0, which allows annotation-driven and XML-declared transactions. To create a transaction using a proxy template, you need to use the TransactionProxyFactoryBean. This creates lengthy Spring configuration files that are difficult to maintain. Therefore, we ll avoid that approach, and look at XML-declared and annotationdriven transactions.

Figure 9-4. GLog entry after changing zoom levels using the zoom control Notice in Figure 9-4 how the old and new zoom levels are specified. From elsewhere in your web application, you can force the zoomend event to execute by calling GEvent.trigger(map,'zoomend'); Executing this method will cause the zoomend event to run as normal. The problem is that you ll get undefined values for both oldLevel and newLevel, as shown in Figure 9-5.

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With Spring 2.0, some new configuration elements were added to support declaring transactions. The new elements are in the tx namespace and can be added to the XSD schema in your applicationContext.xml configuration file. I have highlighted the new elements in Listing 8-2. Spring 2.0 also shipped with an AspectJ aspects library, which can be used to make most objects transactional. AspectJ allows you to annotate objects that use aspects to address modularization of concerns across many objects.

Figure 9-5. GLog entries after triggering zoomend using GEvent.trigger(map,'zoomend') The same applies for any event that passes arguments into its trigger function. If the API can t determine what to pass, you ll get an undefined value. To overcome this problem, you can pass additional arguments after the trigger() event argument, and they ll be passed as the arguments to the event handler function. For example, calling GEvent.trigger(map,'zoomend',3,5); would pass 3 as the oldLevel and 5 as the newLevel. But unless you changed the zoom level of the map some other way, the zoom level wouldn t actually change, since you ve manually forced the zoomend event without calling any of the zoom-related methods of the map.

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