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CHAPTER 10 ADDITIONAL TOPICS
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Figure 10-4. Viewing adviced methods On a method in an advised class, the gutter decoration is a straight arrow pointing to the right. Hovering over the decoration reveals once again the number of AspectJ markers, as shown in Figure 10-5.
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Figure 10-5. Gutter decorations on an adviced method Right-clicking on the gutter decoration reveals the Advised By context menu choice, which reveals that the method is being advised by the three advices provided by the LoggingAndTracing aspect.
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The second aspect that we will explore is an aspect used in the implementation of the DAO pattern in 5. The premise is that the methods can throw one of the many child classes of the Hibernate exception. In our design of the DAO layer will throw customized exceptions. The idea is to map the one or more fine-grained Hibernate exceptions to our simpler custom DAO exceptions. The custom DAO exception hierarchy is shown in Figure 10-6.
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Figure 10-6. Custom DAO exceptions To accomplish this without AOP, you would wrap each method call to Hibernate that could result in a Hibernate Exception in order to catch the thrown exception and throw one of the custom DAO exceptions. It is easy to see how this can result in a great amount of redundant code that would pollute the DAO code. Instead, the code shown in Listing 10-3 shows an aspect that can accomplish this transformation.
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Listing 10-3. HibernateExceptionConverter Aspect package com.integrallis.techconf.dao; import import import import import import org.hibernate.HibernateException; org.hibernate.ObjectDeletedException; org.hibernate.ObjectNotFoundException; org.hibernate.UnresolvableObjectException; org.hibernate.WrongClassException; org.hibernate.QueryException;
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import com.integrallis.techconf.dao.exception.*; public aspect HibernateExceptionConverterAspect { pointcut daoClasses() : call(* com.integrallis.techconf.ejb.dao.hibernate.*DAO*.*(..)); pointcut testClasses() : call(* com.integrallis.techconf.dao.hibernate.*Test.*(..)); Object around() : daoClasses() || testClasses() { try { return proceed(); } catch (Throwable t) { convertAndThrow(t); } return null; } /** * Converts a HibernateException to a custom DAO exception * @param t */ public static void convertAndThrow(Throwable t) { /** * Catch any Hibernate QueryExceptions and retrow * the as ObjectQueryException */ if (t instanceof QueryException) { QueryException ex = (QueryException)t; ObjectQueryException oqe = new ObjectQueryException(t); oqe.setQueryString(ex.getQueryString()); throw oqe; } /** * Catch Hibernate's Object retrieval exceptions and retrow * as ObjectRetrievalException */
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else if (t instanceof UnresolvableObjectException) { UnresolvableObjectException ex = (UnresolvableObjectException)t; throw new ObjectRetrievalFailureException(ex.getEntityName(), ex.getIdentifier(), ex.getMessage(), ex); } else if (t instanceof ObjectNotFoundException) { ObjectNotFoundException ex = (ObjectNotFoundException)t; throw new ObjectRetrievalFailureException(ex.getEntityName(), ex.getIdentifier(), ex.getMessage(), ex); } else if (t instanceof ObjectDeletedException) { ObjectDeletedException ex = (ObjectDeletedException)t; throw new ObjectRetrievalFailureException(ex.getEntityName(), ex.getIdentifier(), ex.getMessage(), ex); } else if (t instanceof WrongClassException) { WrongClassException ex = (WrongClassException)t; throw new ObjectRetrievalFailureException(ex.getEntityName(), ex.getIdentifier(), ex.getMessage(), ex); } /** * Catch any HibernateException */ else if (t instanceof HibernateException) { throw new DataAccessSystemException(t); } /** * If hibernate throws anything else that is not a HibernateException * or a child of it, then retrow it as a RuntimeException */ else { throw new RuntimeException(t); } } } The aspect defines two pointcuts, the daoClasses and the testClasses pointcuts. The daoClasses pointcut defines all the classes in the DAO packages, while the testClasses pointcut is used to cover testing classes. In this aspect we use the around advice, which is used to wrap the implementation of the advised methods in a try-catch block used to trap the Hibernate Exceptions and throw the equivalent DAO custom exception as determined by the convertAndThrow method.
Other Applications of AOP
In this chapter we explored some very basic applications of AOP in the context of the TechConf application. Both of the problems tackled involved non-business system concerns, logging, and exception mapping. AOP techniques can also be used to enhance and improve the design of business concerns in an application.
CHAPTER 10 ADDITIONAL TOPICS
RSS with Informa
Today, one of the features that seem prevalent in most websites is the addition of syndicated materials from blogs, news sites, and any other newslike feed. The RSS (Rich Site Summary/RDF Site Summary) and Atom protocols specify how to format XML documents for syndicating and aggregating list-oriented information. Using RSS you can create a data feed of headline, article, or blog entries summaries for a website, and you can also consume other sites feeds to enhance the content of your website or application. The XML syndication protocols allow systems to process, transform, or format the information from a feed in a consistent manner. (Remember the old days of HTML screen scrapping ) A website feed or channel is available via HTTP just like any other resource on a Web server. The feed provides metadata about several aspects of the data such as update frequency. The Informa RSS library is a pure Java open source API for producing and handling RSS and Atom feeds. Informa emerged as the result of the merging of the underlying libraries of two Java RSS aggregator programs. One of the problems posed by feed producers and consumers is the different protocols available. With RSS we have three different flavors: RSS 0.9x, RSS 1.0, and RSS 2.0. Informa aims at providing a unified object model for a feed channel object model regardless of the format of the feed. Informa can be used to create a feed in any of the supported formats by using the Informa object model. Informa can also be used to aggregate feeds from different sources efficiently. Informa s object model can be persisted via Hibernate, and integration with the Lucene search engine is provided for efficient full-text searching of a feed s content. Figure 10-7 shows a partial view of Informa s object model showing the FeedManager, which is used to serve instances of the FeedIF interface, which in turn is used to create instances of ChannelIF interface. From a ChannelIF, you can get the objects representing the feed items that are instances of the interface ItemIF. Figure 10-7 also shows some of the classes involved in the caching and refreshing of a feed.
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