qr code generator javascript example This example is covered in greater detail in Appendix D. in Java

Generation QR Code in Java This example is covered in greater detail in Appendix D.

This example is covered in greater detail in Appendix D.
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Value Objects
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As we ll be representing the RSS entries in some generic form, first we should define what information we ll expose to the client:
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public interface RssEntry { /** * Obtains the author of the entry * * @return */ String getAuthor(); /** * Obtains the title of the entry * * @return */ String getTitle(); /** * Obtains the URL linking to the entry * * @return */ URL getUrl(); /** * Obtains the short description of the entry * * @return */ String getDescription();
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This is a very simple definition of properties. One thing that s important to note is that the type java.net.URL is itself mutable. We must take care to protect the internal state from being exported in a read request. Otherwise, a local client, which uses pass-byreference, may change the contents of the URL returned from getURL(). To this end, we ll introduce a simple utility to copy the reference such that if a client writes back to it, only his view will be affected:
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class ProtectExportUtil { /** * Internal constructor; protects against instantiation */ private ProtectExportUtil() { } /** * Returns a copy of the specified URL; used to ensure that mutable
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* internal state is not leaked out to clients * @param url * @return */ static URL copyUrl(final URL url) { // If null, return if (url == null) { return url; } try {
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} catch (final MalformedURLException e) { throw new RuntimeException("Error in copying URL", e); }
// Copy return new URL(url.toExternalForm());
Project ROME (https://rome.dev.java.net/) is an open source framework for dealing with RSS feeds, and we ll use it to back our implementation of RssEntry. In returning URLs, it will leverage the ProtectExportUtil:
public class RomeRssEntry implements RssEntry { private private private private String author; String description; String title; URL url;
/** * Constructor * * @param entry The Rome API's RSS Entry representation * @throws IllegalArgumentException If the entry is not specified */ RomeRssEntry(final SyndEntry entry) throws IllegalArgumentException { // Set properties this.author = entry.getAuthor(); final SyndContent content = entry.getDescription(); this.description = content.getValue(); this.title = entry.getTitle(); final String urlString = entry.getLink(); URL url = null; try { url = new URL(urlString); }
catch (final MalformedURLException murle) { throw new RuntimeException("Obtained invalid URL from Rome RSS entry: " + entry, murle); } this.url = url; } @Override public String getAuthor() { return this.author; } @Override public String getDescription() { return this.description; } @Override public String getTitle() { return this.title; } @Override public URL getUrl() { return ProtectExportUtil.copyUrl(this.url); } /* (non-Javadoc) * @see java.lang.Object#toString() */ @Override public String toString() { final StringBuilder sb = new StringBuilder(); sb.append(this.getTitle()); sb.append(" - "); sb.append(this.url.toExternalForm()); return sb.toString(); }
}
That should cover the case of the value object our EJB will need in order to return some results to the client. Note that the ROME implementation is completely separated from the contracted interface. Should we choose to use another library in the future, our clients won t require any recompilation.
The Contract: Business Interfaces
Now we need to define methods to read the cache s contents, obtain the URL that hosts the RSS feed, and refresh the cache from the URL:
public interface RssCacheCommonBusiness { /** * Returns all entries in the RSS Feed represented by * {@link RssCacheCommonBusiness#getUrl()}. * This list will not support mutation and is read-only. */ List<RssEntry> getEntries(); /** * Returns the URL of the RSS Feed * * @return */ URL getUrl(); /** * Flushes the cache and refreshes the entries from the feed */ void refresh();
}
Again, we must take care to protect the internal cache state from being exported in a read request. The point in question here is the List returned from getEntries(). Therefore we note in the documentation that the reference return will be read-only. The refresh() operation will obtain the contents from the URL returned by getURL(), and parse these into the cache. The cache itself is a List of the RssEntry type.
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