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| <div id="ConfluenceContent"><p>Invokers allow you to customise how a particular method is executed. This is particular useful if your underlying service objects are not plain javabeans and instead need to be created or looked up via a custom factory.</p> |
| |
| <p>CXF does provide a number of bundled invokers to handle simple cases. One of these simple cases is when it is desirable to have a singleton for the service object. In this case, you would like to provide a single object instance that should be used for all service invocations. The provided BeanInvoker covers this functionality, and would be used as follows:</p> |
| <div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> |
| <pre class="brush: java; gutter: false; theme: Default"> |
| Service service = ...; |
| service.setInvoker(new BeanInvoker(new MyCustomBean(someParams))); |
| </pre> |
| </div></div> |
| |
| <p>You can access the underlying Service object in two ways. If you've created your service using a ServerFactoryBean, this will yield a Server object which can be used to gain access to the Service:</p> |
| <div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> |
| <pre class="brush: java; gutter: false; theme: Default"> |
| ServerFactoryBean factory = new ServerFactoryBean(); |
| .... |
| Server server = factory.create() |
| Service service = server.getEndpoint().getService(); |
| </pre> |
| </div></div> |
| <p>If you've created a JAX-WS Endpoint object, you can access the Service like this:</p> |
| <div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> |
| <pre class="brush: java; gutter: false; theme: Default"> |
| EndpointImpl endpoint = (EndpointImpl) Endpoint.publish("http://host/service", new MyService()); |
| .... |
| Server server = endpoint.getServer(); |
| Service service = server.getEndpoint().getService(); |
| </pre> |
| </div></div> |
| |
| <p>The following example illustrates how an invoker can be used to allow CXF to expose remote stateless session beans as a webservice. Given the method to invoke, this invoker will create a stateless session bean instance to invoke the method on. The same technique can be used to enable service calls to any object that requires custom creation/lookup.</p> |
| |
| <p>The invoker implementation is as follows:</p> |
| <div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> |
| <pre class="brush: java; gutter: false; theme: Default"> |
| public class EJBInvoker extends AbstractInvoker |
| { |
| private EJBHome home; |
| private Method createMethod; |
| private static final Object[] EMPTY_OBJECT = new Object[0]; |
| |
| public EJBInvoker(EJBHome home) |
| { |
| this.home = home; |
| try |
| { |
| if(!home.getEJBMetaData().isSession() || !home.getEJBMetaData().isStatelessSession()) |
| { |
| throw new IllegalArgumentException("home must be for a stateless session bean"); |
| } |
| createMethod = home.getClass().getMethod("create", new Class[0]); |
| } |
| catch(Exception ex) |
| { |
| throw new IllegalArgumentException("Unable to initialize invoker: " + ex); |
| } |
| } |
| |
| public Object getServiceObject(final Exchange context) |
| { |
| return createMethod.invoke(home, EMPTY_OBJECT); |
| } |
| } |
| </pre> |
| </div></div> |
| <p>Invokers, once defined, need to be registered with the Service. Once a handle onto a Service object has been obtained, the example invoker above can be registered on the binding like this:</p> |
| <div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> |
| <pre class="brush: java; gutter: false; theme: Default"> |
| Service ejbService = ....; |
| ejbService.setInvoker(new EJBInvoker(ejbHome)); |
| </pre> |
| </div></div> |
| <p>If you are using an EJB3 container you can use the following invoker, which is just a simplified version of the above:</p> |
| <div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> |
| <pre class="brush: java; gutter: false; theme: Default"> |
| public class EJB3Invoker extends AbstractInvoker { |
| private Object ejb; |
| |
| public EJB3Invoker(String jndiName) throws NamingException { |
| ejb = new InitialContext().lookup(jndiName); |
| } |
| |
| public Object getServiceObject(final Exchange context) { |
| return ejb; |
| } |
| } |
| </pre> |
| </div></div> |
| |
| <h2 id="Invokers-Executors">Executors</h2> |
| <p>In addition to providing your own Invokers, you can also supply Executors for your service. Executors are a way to control scheduling for your service. To supply your own executor for a service just do:</p> |
| <div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> |
| <pre class="brush: java; gutter: false; theme: Default"> |
| Service service = ....; // look up the service from CXF, or create it |
| service.setExecutor(new MyExecutor()); |
| </pre> |
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