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 <div class="page-header">
     <small><a href="./index.html">Home</a></small><br>
     <h1>Service Locator

         <div style="float: right; position: relative; bottom: -10px; ">
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 </div>

 <p>The functionality of the <a href="jndi-names.html">openejb.jndiname.format</a>
  allows for writing some really fun service locator code.  Creating the
 exact layout you want using the exact data you want means you can create
 robust libraries for pulling things out of JNDI.</p>

 <p><a name="ServiceLocator-Lookupexamples"></a></p>

 <h1>Lookup examples</h1>

 <p>To get the creative juices flowing here are a few examples of lookup
 methods you could create for your service locator, the jndi name formats
 that would work with those lookups, and examples of client code using the
 service locator.  For simplicity, we'll assume all the lookup examples
 start with this basic class that has a built-in lookup allowing for a
 common prefix to be optionally applied to the beginning of all lookup
 strings.</p>

 <pre><code>public class MyLocator {
     private final Context context;

     public MyLocator() throws NamingException {
         this(null);
     }

     public MyLocator(String commonPrefix) throws NamingException {
         Properties properties = new Properties();
         properties.put(Context.INITIAL_CONTEXT_FACTORY, "org.apache.openejb.client.RemoteInitialContextFactory");
         properties.put(Context.PROVIDER_URL, "ejbd://localhost:4201/");
         this.context = new InitialContext(properties);
     }

     public Object lookup(String name) {
         try {
             if (commonPrefix != null) name = commonPrefix + "/" +name;
             return context.lookup(name);
         } catch (NamingException e) {
             throw new IllegalArgumentException(e);
         }
     }
 }
 </code></pre>

 <p><a name="ServiceLocator-Justtheinterface"></a></p>

 <h2>Just the interface</h2>

 <p>Usable with JNDI name formats ending in the full class name of the
 interface such as:
  - {interfaceClass}</p>

 <pre><code>public &lt;T&gt; T lookup(Class&lt;T&gt; type) {
     return (T) lookup(type.getName());
 }


 MyLocator locator = new MyLocator();
 Widget widget = locator.lookup(Widget.class);
 </code></pre>

 <p>Or with a common prefix or with a common prefix supplied in constructor
 such as:
  - {moduleId}/{interfaceClass}
  - ejb/{moduleId}/{interfaceClass}</p>

 <pre><code>MyLocator locator = new MyLocator("ejb/superbiz");
 Widget widget = locator.lookup(Widget.class);
 Store store = locator.lookup(Store.class);
 </code></pre>

 <p><a name="ServiceLocator-Interfaceclassandaprefix"></a></p>

 <h2>Interface class and a prefix</h2>

 <p>Usable with JNDI name formats including a varying prefix such as ejbName or
 deploymentID
 and ending in the full class name of the interface</p>

 <ul>
 <li>{ejbName}/{interfaceClass}</li>
 <li>{deploymentId}/{interfaceClass}</p>

 <p>public <T> T lookup(String prefix, Class<T> type) {
     return (T) lookup(prefix + "/" + type.getName());
 }</p>

 <p>MyLocator locator = new MyLocator();
 Widget redWidget = locator.lookup("RedWidgetBean", Widget.class); <br />
 Widget blueWidget = locator.lookup("BlueWidgetBean", Widget.class);   </li>
 </ul>

 <p>Or with a common prefix or with a common prefix supplied in constructor
 such as:
  - {moduleId}/{ejbName}/{interfaceClass}
  - ejb/{moduleId}/{deploymentId}/{interfaceClass}</p>

 <pre><code>MyLocator locator = new MyLocator("accountingApp");
 Widget widget = locator.lookup("RedWidgetBean", Widget.class);
 Store store = locator.lookup("StoreBean", Store.class);
 </code></pre>

 <p><a name="ServiceLocator-Interfaceclassandejbclass"></a></p>

 <h2>Interface class and ejb class</h2>

 <p>Usable with JNDI name formats comprised of the interfaceClass and ejbClass</p>

 <p>For variation, the interface class is the prefix and the ejb class is the
 suffix.  This is neat as the the prefix (the interface class name) becomes
 a jndi context with one binding in it for each implementing ejb class.</p>

 <p>Works with:
  - {interfaceClass}/{ejbClass}</p>

 <pre><code>public &lt;T&gt; T lookup(Class&lt;T&gt; type, Class ejbClass) {
     return (T) lookup(type.getName() + "/" + ejbClass.getName());
 }


 MyLocator locator = new MyLocator();
 Widget widget = locator.lookup(Widget.class, BlueWidgetBean.class);
 </code></pre>

 <p>Or with a common prefix or with a common prefix supplied in constructor
 such as:
  - {moduleId}/{interfaceClass}/{ejbClass}
  - ejb/{moduleId}/{interfaceClass}/{ejbClass}</p>

 <pre><code>MyLocator locator = new MyLocator("ejb/purchasingApp");
 Widget widget = locator.lookup(Widget.class, RedWidgetBean.class);
 Store store = locator.lookup(Store.class, StoreBean.class);
 </code></pre>

 <p><a name="ServiceLocator-Interfaceclassandejbclasswithsimplenames"></a></p>

 <h2>Interface class and ejb class with simple names</h2>

 <p>Similar to the above example but using the simple name of the classes
 resulting
 in a JNDI tree that's a bit more human readable.
  - {ejbClass.simpleName}/{interfaceClass.simpleName}</p>

 <pre><code>public &lt;T&gt; T lookup(Class ejbClass, Class&lt;T&gt; type) {
     return (T) lookup(ejbClass.getSimpleName() + "" + type.getSimpleName());
 }
 </code></pre>

 <p>and</p>

 <pre><code>MyLocator locator = new MyLocator();
 Widget widget = locator.lookup(RedWidgetBean.class, Widget.class);
 </code></pre>

 <p>Or with a common prefix or with a common prefix supplied in constructor
 such as:
  - {moduleId}/{ejbClass.simpleName}/{interfaceClass.simpleName}
  - ejb/{moduleId}/{ejbClass.simpleName}/{interfaceClass.simpleName}</p>

 <pre><code>MyLocator locator = new MyLocator("shippingApp");
 Widget widget = locator.lookup(GreenWidgetBean.class, Widget.class);
 Store store = locator.lookup(SuperStoreBean.class, Store.class);
 </code></pre>


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	<small><a href="./index.html">Home</a></small><br>
	<h1>Service Locator

	<div style="float: right; position: relative; bottom: -10px; ">
	<a onclick="javascript:gpshare()" class="gp-share sprite" title="Share on Google+">share [gp]</a>
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	<a data-toggle="modal" href="#edit" class="edit-page" title="Contribute to this Page">contribute</a>
	</div>
	</h1>
	</div>

	<p>The functionality of the <a href="jndi-names.html">openejb.jndiname.format</a>
	allows for writing some really fun service locator code. Creating the
	exact layout you want using the exact data you want means you can create
	robust libraries for pulling things out of JNDI.</p>

	<p><a name="ServiceLocator-Lookupexamples"></a></p>

	<h1>Lookup examples</h1>

	<p>To get the creative juices flowing here are a few examples of lookup
	methods you could create for your service locator, the jndi name formats
	that would work with those lookups, and examples of client code using the
	service locator. For simplicity, we'll assume all the lookup examples
	start with this basic class that has a built-in lookup allowing for a
	common prefix to be optionally applied to the beginning of all lookup
	strings.</p>

	<pre><code>public class MyLocator {
	private final Context context;

	public MyLocator() throws NamingException {
	this(null);
	}

	public MyLocator(String commonPrefix) throws NamingException {
	Properties properties = new Properties();
	properties.put(Context.INITIAL_CONTEXT_FACTORY, "org.apache.openejb.client.RemoteInitialContextFactory");
	properties.put(Context.PROVIDER_URL, "ejbd://localhost:4201/");
	this.context = new InitialContext(properties);
	}

	public Object lookup(String name) {
	try {
	if (commonPrefix != null) name = commonPrefix + "/" +name;
	return context.lookup(name);
	} catch (NamingException e) {
	throw new IllegalArgumentException(e);
	}
	}
	}
	</code></pre>

	<p><a name="ServiceLocator-Justtheinterface"></a></p>

	<h2>Just the interface</h2>

	<p>Usable with JNDI name formats ending in the full class name of the
	interface such as:
	- {interfaceClass}</p>

	<pre><code>public <T> T lookup(Class<T> type) {
	return (T) lookup(type.getName());
	}



	MyLocator locator = new MyLocator();
	Widget widget = locator.lookup(Widget.class);
	</code></pre>

	<p>Or with a common prefix or with a common prefix supplied in constructor
	such as:
	- {moduleId}/{interfaceClass}
	- ejb/{moduleId}/{interfaceClass}</p>

	<pre><code>MyLocator locator = new MyLocator("ejb/superbiz");
	Widget widget = locator.lookup(Widget.class);
	Store store = locator.lookup(Store.class);
	</code></pre>

	<p><a name="ServiceLocator-Interfaceclassandaprefix"></a></p>

	<h2>Interface class and a prefix</h2>

	<p>Usable with JNDI name formats including a varying prefix such as ejbName or
	deploymentID
	and ending in the full class name of the interface</p>

	<ul>
	<li>{ejbName}/{interfaceClass}</li>
	<li>{deploymentId}/{interfaceClass}</p>

	<p>public <T> T lookup(String prefix, Class<T> type) {
	return (T) lookup(prefix + "/" + type.getName());
	}</p>

	<p>MyLocator locator = new MyLocator();
	Widget redWidget = locator.lookup("RedWidgetBean", Widget.class); <br />
	Widget blueWidget = locator.lookup("BlueWidgetBean", Widget.class); </li>
	</ul>

	<p>Or with a common prefix or with a common prefix supplied in constructor
	such as:
	- {moduleId}/{ejbName}/{interfaceClass}
	- ejb/{moduleId}/{deploymentId}/{interfaceClass}</p>

	<pre><code>MyLocator locator = new MyLocator("accountingApp");
	Widget widget = locator.lookup("RedWidgetBean", Widget.class);
	Store store = locator.lookup("StoreBean", Store.class);
	</code></pre>

	<p><a name="ServiceLocator-Interfaceclassandejbclass"></a></p>

	<h2>Interface class and ejb class</h2>

	<p>Usable with JNDI name formats comprised of the interfaceClass and ejbClass</p>

	<p>For variation, the interface class is the prefix and the ejb class is the
	suffix. This is neat as the the prefix (the interface class name) becomes
	a jndi context with one binding in it for each implementing ejb class.</p>

	<p>Works with:
	- {interfaceClass}/{ejbClass}</p>

	<pre><code>public <T> T lookup(Class<T> type, Class ejbClass) {
	return (T) lookup(type.getName() + "/" + ejbClass.getName());
	}



	MyLocator locator = new MyLocator();
	Widget widget = locator.lookup(Widget.class, BlueWidgetBean.class);
	</code></pre>

	<p>Or with a common prefix or with a common prefix supplied in constructor
	such as:
	- {moduleId}/{interfaceClass}/{ejbClass}
	- ejb/{moduleId}/{interfaceClass}/{ejbClass}</p>

	<pre><code>MyLocator locator = new MyLocator("ejb/purchasingApp");
	Widget widget = locator.lookup(Widget.class, RedWidgetBean.class);
	Store store = locator.lookup(Store.class, StoreBean.class);
	</code></pre>

	<p><a name="ServiceLocator-Interfaceclassandejbclasswithsimplenames"></a></p>

	<h2>Interface class and ejb class with simple names</h2>

	<p>Similar to the above example but using the simple name of the classes
	resulting
	in a JNDI tree that's a bit more human readable.
	- {ejbClass.simpleName}/{interfaceClass.simpleName}</p>

	<pre><code>public <T> T lookup(Class ejbClass, Class<T> type) {
	return (T) lookup(ejbClass.getSimpleName() + "" + type.getSimpleName());
	}
	</code></pre>

	<p>and</p>

	<pre><code>MyLocator locator = new MyLocator();
	Widget widget = locator.lookup(RedWidgetBean.class, Widget.class);
	</code></pre>

	<p>Or with a common prefix or with a common prefix supplied in constructor
	such as:
	- {moduleId}/{ejbClass.simpleName}/{interfaceClass.simpleName}
	- ejb/{moduleId}/{ejbClass.simpleName}/{interfaceClass.simpleName}</p>

	<pre><code>MyLocator locator = new MyLocator("shippingApp");
	Widget widget = locator.lookup(GreenWidgetBean.class, Widget.class);
	Store store = locator.lookup(SuperStoreBean.class, Store.class);
	</code></pre>




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