master/pt/examples/dynamic-proxy-to-access-mbean.html - tomee-site-pub - Git at Google

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             <div class='page-header'>

               <h1>Proxy dinâmico para acessar o MBean</h1>
             </div>
           </div>
         </div>
         <div class="row">

             <div class="col-md-12">
                 <div class="sect1">
 <h2 id="_exemplo">Exemplo</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>Acessar o MBean é algo simples por meio da API JMX, mas geralmente é
 técnico e não muito interessante.</p>
 </div>
 <div class="paragraph">
 <p>Este exemplo simplifica este trabalho simplesmente fazendo isso genericamente em um proxy.</p>
 </div>
 <div class="paragraph">
 <p>Portanto, do lado do usuário, você simplesmente declara uma interface para acessar seus
 MBeans.</p>
 </div>
 <div class="paragraph">
 <p>Nota: A implementação de exemplo usa um MBeanServer local, mas aprimorando
 a API de exemplo, é fácil imaginar uma conexão remota com
 usuário / senha, se necessário.</p>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_api_objectname_anotação">API ObjectName (anotação)</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>Simplesmente uma anotação para obter o objeto</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.dynamic.mbean;

 import java.lang.annotation.Retention;
 import java.lang.annotation.Target;

 import static java.lang.annotation.ElementType.TYPE;
 import static java.lang.annotation.ElementType.METHOD;
 import static java.lang.annotation.RetentionPolicy.RUNTIME;

 @Target({TYPE, METHOD})
 @Retention(RUNTIME)
 public @interface ObjectName {
     String value();

     // apenas para uso remoto
     String url() default "";
     String user() default "";
     String password() default "";
 }</code></pre>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_dynamicmbean_handler_a_implementação_de_proxy">DynamicMBean Handler (a implementação de proxy)</h2>
 <div class="sectionbody">
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.dynamic.mbean;

 import javax.annotation.PreDestroy;
 import javax.management.Attribute;
 import javax.management.MBeanAttributeInfo;
 import javax.management.MBeanInfo;
 import javax.management.MBeanServer;
 import javax.management.MBeanServerConnection;
 import javax.management.ObjectName;
 import javax.management.remote.JMXConnector;
 import javax.management.remote.JMXConnectorFactory;
 import javax.management.remote.JMXServiceURL;
 import java.io.IOException;
 import java.lang.management.ManagementFactory;
 import java.lang.reflect.InvocationHandler;
 import java.lang.reflect.Method;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;

 /**
  * Precisa de um método @PreDestroy para desconectar o host remoto quando usado no modo remoto.
  */
 public class DynamicMBeanHandler implements InvocationHandler {
     private final Map&lt;Method, ConnectionInfo&gt; infos = new ConcurrentHashMap&lt;Method, ConnectionInfo&gt;();

     @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
         final String methodName = method.getName();
         if (method.getDeclaringClass().equals(Object.class) &amp;&amp; "toString".equals(methodName)) {
             return getClass().getSimpleName() + " Proxy";
         }
         if (method.getAnnotation(PreDestroy.class) != null) {
             return destroy();
         }

         final ConnectionInfo info = getConnectionInfo(method);
         final MBeanInfo infos = info.getMBeanInfo();
         if (methodName.startsWith("set") &amp;&amp; methodName.length() &gt; 3 &amp;&amp; args != null &amp;&amp; args.length == 1
             &amp;&amp; (Void.TYPE.equals(method.getReturnType()) || Void.class.equals(method.getReturnType()))) {
             final String attributeName = attributeName(infos, methodName, method.getParameterTypes()[0]);
             info.setAttribute(new Attribute(attributeName, args[0]));
             return null;
         } else if (methodName.startsWith("get") &amp;&amp; (args == null || args.length == 0) &amp;&amp; methodName.length() &gt; 3) {
             final String attributeName = attributeName(infos, methodName, method.getReturnType());
             return info.getAttribute(attributeName);
         }
         // Operação
         return info.invoke(methodName, args, getSignature(method));
     }

     public Object destroy() {
         for (ConnectionInfo info : infos.values()) {
             info.clean();
         }
         infos.clear();
         return null;
     }

     private String[] getSignature(Method method) {
         String[] args = new String[method.getParameterTypes().length];
         for (int i = 0; i &lt; method.getParameterTypes().length; i++) {
             args[i] = method.getParameterTypes()[i].getName();
         }
         return args; // note: null geralmente deve funcionar...
     }

     private String attributeName(MBeanInfo infos, String methodName, Class&lt;?&gt; type) {
         String found = null;
         String foundBackUp = null; // sem verificar o tipo
         final String attributeName = methodName.substring(3, methodName.length());
         final String lowerName = Character.toLowerCase(methodName.charAt(3)) + methodName.substring(4, methodName.length());

         for (MBeanAttributeInfo attribute : infos.getAttributes()) {
             final String name = attribute.getName();
             if (attributeName.equals(name)) {
                 foundBackUp = attributeName;
                 if (attribute.getType().equals(type.getName())) {
                     found = name;
                 }
             } else if (found == null &amp;&amp; ((lowerName.equals(name) &amp;&amp; !attributeName.equals(name))
                 || lowerName.equalsIgnoreCase(name))) {
                 foundBackUp = name;
                 if (attribute.getType().equals(type.getName())) {
                     found = name;
                 }
             }
         }

         if (found == null &amp;&amp; foundBackUp == null) {
             throw new UnsupportedOperationException("cannot find attribute " + attributeName);
         }

         if (found != null) {
             return found;
         }
         return foundBackUp;
     }

     private synchronized ConnectionInfo getConnectionInfo(Method method) throws Exception {
         if (!infos.containsKey(method)) {
             synchronized (infos) {
                 if (!infos.containsKey(method)) { // verifica novamente se há sincronização
                     org.superbiz.dynamic.mbean.ObjectName on = method.getAnnotation(org.superbiz.dynamic.mbean.ObjectName.class);
                     if (on == null) {
                         Class&lt;?&gt; current = method.getDeclaringClass();
                         do {
                             on = method.getDeclaringClass().getAnnotation(org.superbiz.dynamic.mbean.ObjectName.class);
                             current = current.getSuperclass();
                         } while (on == null &amp;&amp; current != null);
                         if (on == null) {
                             throw new UnsupportedOperationException("classe ou método deve definir o objectName a ser usado para invocação: " + method.toGenericString());
                         }
                     }
                     final ConnectionInfo info;
                     if (on.url().isEmpty()) {
                         info = new LocalConnectionInfo();
                         ((LocalConnectionInfo) info).server = ManagementFactory.getPlatformMBeanServer(); //poderia usar um id ...
                     } else {
                         info = new RemoteConnectionInfo();
                         final Map&lt;String, String[]&gt; environment = new HashMap&lt;String, String[]&gt;();
                         if (!on.user().isEmpty()) {
                             environment.put(JMXConnector.CREDENTIALS, new String[]{ on.user(), on.password() });
                         }
                         // ((RemoteConnectionInfo) info).connector = JMXConnectorFactory.newJMXConnector(new JMXServiceURL(on.url()), environment);
                         ((RemoteConnectionInfo) info).connector = JMXConnectorFactory.connect(new JMXServiceURL(on.url()), environment);

                     }
                     info.objectName = new ObjectName(on.value());

                     infos.put(method, info);
                 }
             }
         }
         return infos.get(method);
     }

     private abstract static class ConnectionInfo {
         protected ObjectName objectName;

         public abstract void setAttribute(Attribute attribute) throws Exception;
         public abstract Object getAttribute(String attribute) throws Exception;
         public abstract Object invoke(String operationName, Object params[], String signature[]) throws Exception;
         public abstract MBeanInfo getMBeanInfo() throws Exception;
         public abstract void clean();
     }

     private static class LocalConnectionInfo extends ConnectionInfo {
         private MBeanServer server;

         @Override public void setAttribute(Attribute attribute) throws Exception {
             server.setAttribute(objectName, attribute);
         }

         @Override public Object getAttribute(String attribute) throws Exception {
             return server.getAttribute(objectName, attribute);
         }

         @Override
         public Object invoke(String operationName, Object[] params, String[] signature) throws Exception {
             return server.invoke(objectName, operationName, params, signature);
         }

         @Override public MBeanInfo getMBeanInfo() throws Exception {
             return server.getMBeanInfo(objectName);
         }

         @Override public void clean() {
             // no-op
         }
     }

     private static class RemoteConnectionInfo extends ConnectionInfo {
         private JMXConnector connector;
         private MBeanServerConnection connection;

         private void before() throws IOException {
             connection = connector.getMBeanServerConnection();
         }

         private void after() throws IOException {
             // no-op
         }

         @Override public void setAttribute(Attribute attribute) throws Exception {
             before();
             connection.setAttribute(objectName, attribute);
             after();
         }

         @Override public Object getAttribute(String attribute) throws Exception {
             before();
             try {
                 return connection.getAttribute(objectName, attribute);
             } finally {
                 after();
             }
         }

         @Override
         public Object invoke(String operationName, Object[] params, String[] signature) throws Exception {
             before();
             try {
                 return connection.invoke(objectName, operationName, params, signature);
             } finally {
                 after();
             }
         }

         @Override public MBeanInfo getMBeanInfo() throws Exception {
             before();
             try {
                 return connection.getMBeanInfo(objectName);
             } finally {
                 after();
             }
         }

         @Override public void clean() {
             try {
                 connector.close();
             } catch (IOException e) {
                 // no-op
             }
         }
     }
 }</code></pre>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_proxies_dinâmicos">Proxies dinâmicos</h2>
 <div class="sectionbody">
 <div class="sect2">
 <h3 id="_dynamicmbeanclient_o_cliente_jmx_dinâmico">DynamicMBeanClient (o cliente JMX dinâmico)</h3>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.dynamic.mbean;

 import org.apache.openejb.api.Proxy;
 import org.superbiz.dynamic.mbean.DynamicMBeanHandler;
 import org.superbiz.dynamic.mbean.ObjectName;

 import javax.ejb.Singleton;

 /**
  * @author rmannibucau
  */
 @Singleton
 @Proxy(DynamicMBeanHandler.class)
 @ObjectName(DynamicMBeanClient.OBJECT_NAME)
 public interface DynamicMBeanClient {
     static final String OBJECT_NAME = "test:group=DynamicMBeanClientTest";

     int getCounter();
     void setCounter(int i);
     int length(String aString);
 }</code></pre>
 </div>
 </div>
 </div>
 <div class="sect2">
 <h3 id="_dynamicremotembeanclient_o_cliente_jmx_dinâmico_remoto">DynamicRemoteMBeanClient (o Cliente JMX Dinâmico Remoto)</h3>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.dynamic.mbean;

 import org.apache.openejb.api.Proxy;

 import javax.annotation.PreDestroy;
 import javax.ejb.Singleton;


 @Singleton
 @Proxy(DynamicMBeanHandler.class)
 @ObjectName(value = DynamicRemoteMBeanClient.OBJECT_NAME, url = "service:jmx:rmi:///jndi/rmi://localhost:8243/jmxrmi")
 public interface DynamicRemoteMBeanClient {
     static final String OBJECT_NAME = "test:group=DynamicMBeanClientTest";

     int getCounter();
     void setCounter(int i);
     int length(String aString);

     @PreDestroy void clean();
 }</code></pre>
 </div>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_o_mbean_usado_para_o_teste">O MBean usado para o teste</h2>
 <div class="sectionbody">
 <div class="sect2">
 <h3 id="_simplembean">SimpleMBean</h3>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.dynamic.mbean.simple;

 public interface SimpleMBean {
     int length(String s);

     int getCounter();
     void setCounter(int c);
 }</code></pre>
 </div>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_simple">Simple</h2>
 <div class="sectionbody">
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.dynamic.mbean.simple;

 public class Simple implements SimpleMBean {
     private int counter = 0;

     @Override public int length(String s) {
         if (s == null) {
             return 0;
         }
         return s.length();
     }

     @Override public int getCounter() {
         return counter;
     }

     @Override public void setCounter(int c) {
         counter = c;
     }
 }</code></pre>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_dynamicmbeanclienttest_o_teste">DynamicMBeanClientTest (O teste)</h2>
 <div class="sectionbody">
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.dynamic.mbean;

 import org.junit.After;
 import org.junit.AfterClass;
 import org.junit.Before;
 import org.junit.BeforeClass;
 import org.junit.Test;
 import org.superbiz.dynamic.mbean.simple.Simple;

 import javax.ejb.EJB;
 import javax.ejb.embeddable.EJBContainer;
 import javax.management.Attribute;
 import javax.management.ObjectName;
 import java.lang.management.ManagementFactory;

 import static junit.framework.Assert.assertEquals;

 public class DynamicMBeanClientTest {
     private static ObjectName objectName;
     private static EJBContainer container;

     @EJB private DynamicMBeanClient localClient;
     @EJB private DynamicRemoteMBeanClient remoteClient;

     @BeforeClass public static void start() {
         container = EJBContainer.createEJBContainer();
     }

     @Before public void injectAndRegisterMBean() throws Exception {
         container.getContext().bind("inject", this);
         objectName = new ObjectName(DynamicMBeanClient.OBJECT_NAME);
         ManagementFactory.getPlatformMBeanServer().registerMBean(new Simple(), objectName);
     }

     @After public void unregisterMBean() throws Exception {
         if (objectName != null) {
             ManagementFactory.getPlatformMBeanServer().unregisterMBean(objectName);
         }
     }

     @Test public void localGet() throws Exception {
         assertEquals(0, localClient.getCounter());
         ManagementFactory.getPlatformMBeanServer().setAttribute(objectName, new Attribute("Counter", 5));
         assertEquals(5, localClient.getCounter());
     }

     @Test public void localSet() throws Exception {
         assertEquals(0, ((Integer) ManagementFactory.getPlatformMBeanServer().getAttribute(objectName, "Counter")).intValue());
         localClient.setCounter(8);
         assertEquals(8, ((Integer) ManagementFactory.getPlatformMBeanServer().getAttribute(objectName, "Counter")).intValue());
     }

     @Test public void localOperation() {
         assertEquals(7, localClient.length("openejb"));
     }

     @Test public void remoteGet() throws Exception {
         assertEquals(0, remoteClient.getCounter());
         ManagementFactory.getPlatformMBeanServer().setAttribute(objectName, new Attribute("Counter", 5));
         assertEquals(5, remoteClient.getCounter());
     }

     @Test public void remoteSet() throws Exception {
         assertEquals(0, ((Integer) ManagementFactory.getPlatformMBeanServer().getAttribute(objectName, "Counter")).intValue());
         remoteClient.setCounter(8);
         assertEquals(8, ((Integer) ManagementFactory.getPlatformMBeanServer().getAttribute(objectName, "Counter")).intValue());
     }

     @Test public void remoteOperation() {
         assertEquals(7, remoteClient.length("openejb"));
     }

     @AfterClass public static void close() {
         if (container != null) {
             container.close();
         }
     }
 }</code></pre>
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