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| <h1 class="page">Example 7 - Spell Checker Client Bundle</h1> |
| <div class="paragraph"> |
| <p>In this example we create a client for the spell checker service we implemented in Example 6. |
| This client monitors the dynamic availability of the spell checker service using the Service Tracker and is very similar in structure to the dictionary client we implemented in Example 5. |
| The functionality of the spell checker client reads passages from standard input and spell checks them using the spell checker service. |
| Our bundle uses its bundle context to create a <code>ServiceTracker</code> object to monitor spell checker services. |
| The source code for our bundle is as follows in a file called <code>Activator.java</code>:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>/* |
| * Apache Felix OSGi tutorial. |
| **/ |
| |
| package tutorial.example7; |
| |
| import java.io.BufferedReader; |
| import java.io.InputStreamReader; |
| import java.io.IOException; |
| |
| import org.osgi.framework.BundleActivator; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.util.tracker.ServiceTracker; |
| |
| import tutorial.example6.service.SpellChecker; |
| |
| /** |
| * This class implements a bundle that uses a spell checker |
| * service to check the spelling of a passage. This bundle |
| * is essentially identical to Example 5, in that it uses the |
| * Service Tracker to monitor the dynamic availability of the |
| * spell checker service. When starting this bundle, the thread |
| * calling the start() method is used to read passages from |
| * standard input. You can stop spell checking passages by |
| * entering an empty line, but to start spell checking again |
| * you must stop and then restart the bundle. |
| **/ |
| public class Activator implements BundleActivator |
| { |
| // Bundle's context. |
| private BundleContext m_context = null; |
| // The service tacker object. |
| private ServiceTracker m_tracker = null; |
| |
| /** |
| * Implements BundleActivator.start(). Creates a Service |
| * Tracker object to monitor spell checker services. Enters |
| * a spell check loop where it reads passages from standard |
| * input and checks their spelling using the spell checker service. |
| * (NOTE: It is very bad practice to use the calling thread |
| * to perform a lengthy process like this; this is only done |
| * for the purpose of the tutorial.) |
| * @param context the framework context for the bundle. |
| **/ |
| public void start(BundleContext context) throws Exception |
| { |
| m_context = context; |
| |
| // Create a service tracker to monitor dictionary services. |
| m_tracker = new ServiceTracker( |
| m_context, |
| m_context.createFilter( |
| "(objectClass=" + SpellChecker.class.getName() + ")"), |
| null); |
| m_tracker.open(); |
| |
| try |
| { |
| System.out.println("Enter a blank line to exit."); |
| String passage = ""; |
| BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); |
| |
| // Loop endlessly. |
| while (true) |
| { |
| // Ask the user to enter a passage. |
| System.out.print("Enter passage: "); |
| passage = in.readLine(); |
| |
| // Get the selected dictionary service, if available. |
| SpellChecker checker = (SpellChecker) m_tracker.getService(); |
| |
| // If the user entered a blank line, then |
| // exit the loop. |
| if (passage.length() == 0) |
| { |
| break; |
| } |
| // If there is no spell checker, then say so. |
| else if (checker == null) |
| { |
| System.out.println("No spell checker available."); |
| } |
| // Otherwise check passage and print misspelled words. |
| else |
| { |
| String[] errors = checker.check(passage); |
| |
| if (errors == null) |
| { |
| System.out.println("Passage is correct."); |
| } |
| else |
| { |
| System.out.println("Incorrect word(s):"); |
| for (int i = 0; i < errors.length; i++) |
| { |
| System.out.println(" " + errors[i]); |
| } |
| } |
| } |
| } |
| } catch (Exception ex) { } |
| } |
| |
| /** |
| * Implements BundleActivator.stop(). Does nothing since |
| * the framework will automatically unget any used services. |
| * @param context the framework context for the bundle. |
| **/ |
| public void stop(BundleContext context) |
| { |
| } |
| }</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The client uses the Service Tracker to listen for spell checker services. |
| Like normal, we must create a <code>manifest.mf</code> file that contains the meta-data for our bundle; |
| the manifest file contains the following:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>Bundle-Name: Spell checker client |
| Bundle-Description: A bundle that uses the spell checker service |
| Bundle-Vendor: Richard Hall |
| Bundle-Version: 1.0.0 |
| Bundle-Activator: tutorial.example7.Activator |
| Import-Package: org.osgi.framework, |
| org.osgi.util.tracker, |
| tutorial.example6.service</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>We specify which class is used to activate the bundle via the <code>Bundle-Activator</code> attribute and also specify that our bundle imports the OSGi core, OSGi Service Tracker, and spell checker service interface packages with the <code>Import-Package</code> attribute. |
| The OSGi framework will automatically handle the details of resolving import packages. |
| (Note: Make sure your manifest file ends in a trailing carriage return or else the last line will be ignored.)</p> |
| </div> |
| <div class="paragraph"> |
| <p>To compile our source code, we need to have the <code>felix.jar</code> file (found in Felix' <code>bin</code> directory) and the <code>example6.jar</code> file in our class path. |
| We compile the source file using a command like:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>javac -d c:\classes *.java</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>This command compiles all source files and outputs the generated classes into a subdirectory of the <code>c:\classes</code> directory; |
| this subdirectory is <code>tutorial\example7</code>, named after the package we specified in the source file. |
| For the above command to work, the <code>c:\classes</code> directory must exist. |
| After compiling, we need to create a JAR file containing the generated package directories. |
| We will also add our manifest file that contains the bundle’s meta-data to the JAR file. |
| To create the JAR file, we issue the command:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>jar cfm example7.jar manifest.mf -C c:\classes tutorial\example7</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>This command creates a JAR file using the manifest file we created and includes all of the classes in the tutorial\example6 directory inside of the <code>c:\classes</code> directory. |
| Once the JAR file is created, we are ready to install and start the bundle.</p> |
| </div> |
| <div class="paragraph"> |
| <p>To run Felix, we follow the instructions described in usage.html. |
| When we start Felix, it asks for a profile name, we will put all of our bundles in a profile named <code>tutorial</code>. |
| After running Felix, we should stop all tutorial bundles except for the service bundles. |
| Use the <code>lb</code> command to make sure that only the bundles from Example 2, Example 2b, and Example 6 are active; |
| use the <code>start</code> and <code>stop</code> commands as appropriate to start and stop the various tutorial bundles, respectively. |
| (Note: Felix uses some bundles to provide its command shell, so do not stop these bundles.) Now we can install and start our spell checker client bundle. |
| Assuming that we created our bundle in the directory <code>c:\tutorial</code>, we can install and start it in Felix' shell using the following command:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>start file:/c:/tutorial/example7.jar</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The above command installs and starts the bundle in a single step; |
| it is also possible to install and start the bundle in two steps by using the Felix <code>install</code> and <code>start</code> shell commands. |
| When we start the bundle, it will use the shell thread to prompt us for passages; |
| a passage is a collection or words separate by spaces, commas, periods, exclamation points, question marks, colons, or semi-colons. |
| Enter a passage and press the enter key to spell check the passage or enter a blank line to stop spell checking passages. |
| To restart the bundle, we must use the Felix shell <code>lb</code> command to get the bundle identifier number for the bundle and first use the <code>stop</code> command to stop the bundle, then the <code>start</code> command to restart it.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Since this client uses the Service Tracker to monitor the dynamic availability of the spell checker service, it is robust in the scenario where the spell checker service suddenly departs. |
| Further, when a spell checker service arrives, it automatically gets the service if it needs it and continues to function. |
| These capabilities are a little difficult to demonstrate since we are using a simple single-threaded approach, but in a multi-threaded or GUI-oriented application this robustness is very useful.</p> |
| </div> |
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