Criando e Configurando um Provedor JDBC e uma Origem de Dados Usando a API JMX

Usando o JMX API para criar os objetos de configuração necessários para acessar os bancos de dados relacionais. Esta amostra de código demonstra como utilizar os MBeans do WebSphere® Application Server para criar e configurar os objetos necessários para acessar um banco de dados relacional a partir de um aplicativo corporativo. Esses objetos incluem: um provedor JDBC, apto para XA ou não XA, uma origem de dados, um alias de autenticação e, opcionalmente, um connexction factory da Persistência Gerenciada por Contêiner (CMP). Os detalhes da configuração dessas opções podem ser localizados nos comentários do cabeçalho do seguinte código de origem. A amostra também demonstra como usar o MBean de origem de dados para recarregar as mudanças na configuração no servidor em execução.

/**
 * COPYRIGHT LICENSE: This information contains sample code provided in
 * source code form. You may copy, modify, and distribute this sample
 * program in any form without payment to IBM for the purposes of
 * developing, using, marketing or distributing application programs
 * conforming to the application programming interface for the operating
 * platform for which the sample code is written. Notwithstanding anything
 * to the contrary, IBM PROVIDES THE SAMPLE SOURCE CODE ON AN "AS IS" BASIS
 * AND IBM DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT
 * LIMITED TO, ANY IMPLIED WARRANTIES OR CONDITIONS OF MERCHANTABILITY,
 * SATISFACTORY QUALITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND ANY
 * WARRANTY OR CONDITION OF NON-INFRINGEMENT. IBM SHALL NOT BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES ARISING
 * OUT OF THE USE OR OPERATION OF THE SAMPLE SOURCE CODE. IBM HAS NO
 * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS OR
 * MODIFICATIONS TO THE SAMPLE SOURCE CODE.
 * 
 * Copyright IBM Corp. 2011.
 * All Rights Reserved. Licensed Materials - Property of IBM.
 */

import java.util.Properties;
import java.util.Set;

import javax.management.Attribute;
import javax.management.AttributeList;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;

import com.ibm.websphere.management.AdminClient;
import com.ibm.websphere.management.AdminClientFactory;
import com.ibm.websphere.management.Session;
import com.ibm.websphere.management.configservice.ConfigServiceHelper;
import com.ibm.websphere.management.configservice.SystemAttributes;
import com.ibm.websphere.management.exception.ConnectorException;

/**
 * This sample code demonstrates the use of the WebSphere JMX APIs to create
 * a DB2 jdbc provider and data source with an authentication alias. 
 * This sample code may be configured to:
 * - Create either node or server scoped objects
 * - Create either an XA or non-XA jdbc provider
 * - Create a connection factory so the data source may be used by CMP beans,
 * otherwise the data source may be used by BMP beans, session beans, or
 * servlets
 * These are configured by setting the value of class constants
 * (see "Program configuration settings")
 * The jdbc provider, data source and CMP connection factory (if configured)
 * are created using predefined templates, which is a best practice.  
 * Note: there are templates which will create both the jdbc provider and a
 * data source at once, this sample intentionally creates both objects
 * separately for thoroughness
 * 
 * To compile and run this program, put the admin client bundle
 * was_install_root\runtimes\com.ibm.ws.admin.client_8.0.0.jar
 * on the classpath in addition to the classfile that was obtained when 
 * this source file was built. 
 * 
 * Once compiled, this program is run in it's own JVM and
 * uses the WebSphere Admin Client API to interact with a WebSphere
 * Application Server either locally or remotely to create the
 * previously discussed JDBC resources.
 */

public class JDBCResourcesWithJMX {

    // program configuration settings
    // if true, an XA capable jdbc provider is created, otherwise non-XA
    private static final boolean createXAJDBCProvider = true;
    // if true, a CMP connection factory will be created for use by CMP beans,
    // otherwise the data source created can be used with BMP beans, session
    // beans, or servlets
    private static final boolean createCMPConnectionFactory = true;
    // if true, create node-scoped objects, otherwise create server
    private static final boolean createNodeScopedCfgObjs = true;
    // end program configuration settings
    
    private static final String jdbcProviderName =
        "Sample DB2 JDBC Provider";
    private static final String jdbcProviderTemplateNameXA =
        "DB2 Using IBM JCC Driver Provider Only (XA)";
    private static final String jdbcProviderTemplateName =
        "DB2 Using IBM JCC Driver Provider Only";
    // an alias for authentication data
    private static final String authDataAlias = "db2admin";
    private static final String authAliasDescription =
        "Sample authentication alias";
    private static final String authAliasUserID = "db2admin"; // user ID
    private static final String authAliasPassword = "db2admin"; // password
    private static final String dataSourceProviderTemplateNameXA =
        "DB2 Using IBM JCC Driver - XA DataSource";
    private static final String dataSourceHelperClassName =
        "com.ibm.websphere.rsadapter.DB2DataStoreHelper";
    private static final String cmpConnFactTemplateName =
        "CMPConnectorFactory";
    // display name for data source(DS)and connection factory(CF)
    private static final String dataSourceName = "SampleDataSource";
    private static final String dataSourceTemplateName =
        "DB2 Using IBM JCC Driver - DataSource";

    @SuppressWarnings("unused")
    private static final String dbName = "SamplesDB"; // the database name

    public static void main(String[] args) {
        JDBCResourcesWithJMX cds = new JDBCResourcesWithJMX();

        try {
            cds.run(args);
        }
        catch (Exception ex) {
            System.out.println("Caught exception: " + ex);
            ex.printStackTrace();
        }
    }

    /**
     * Creates a jdbc provider, data source, authentication alias and connection
     * factory, if so configured. Neither the data source or conn factory, if
     * created, is bound into namespace until the server is restarted or an
     * application using it is started
     */
    private void run(String[] args) throws Exception {

        // Initialize the AdminClient.
        Properties adminProps = new Properties();
        adminProps.setProperty(AdminClient.CONNECTOR_TYPE,
            AdminClient.CONNECTOR_TYPE_SOAP);
        adminProps.setProperty(AdminClient.CONNECTOR_HOST, "localhost");
        adminProps.setProperty(AdminClient.CONNECTOR_PORT, "8880");
        AdminClient adminClient =
            AdminClientFactory.createAdminClient(adminProps);

        Session session = new Session();

        // use node scope to create config objects
        ObjectName scope = null;
        if (createNodeScopedCfgObjs) {
            scope = ConfigServiceHelper.createObjectName(null, "Node", null);
        }
        else { // unless server scope is configured
            scope = ConfigServiceHelper.createObjectName(null, "Server",
                "server1");
        }
        
        // retrieve the ConfigService MBean
        ObjectName configServiceMBean =
            retrieveJMXMBean(adminClient, "ConfigService");

        // invoke mbean queryConfigObjects operation
        // to find either a server or node
        ObjectName[] matches = (ObjectName[])adminClient.invoke(
            configServiceMBean,
            "queryConfigObjects",
            // parameters for operation
            new Object[] {session, null, scope, null},
            // signature of bean method to invoke
            new String[] {"com.ibm.websphere.management.Session",
                "javax.management.ObjectName",
                "javax.management.ObjectName",
                "javax.management.QueryExp"});
        scope = matches[0]; // use the first server or node object found

        // create a jdbc provider at the specified scope
        ObjectName jdbcProv =
            createJDBCProvider(adminClient, session, scope, 
            configServiceMBean);

        // create an authentication alias for the data source
        createAuthAlias(adminClient, session, configServiceMBean);

        // Retrieve built-in WebSphere Relational Resource Adapter (RRA) at
        // same scope as previous
        ObjectName rra =
            ConfigServiceHelper.createObjectName(null, "J2CResourceAdapter",
                null);

        // invoke mbean queryConfigObjects operation
        matches = (ObjectName[])adminClient.invoke(
            configServiceMBean,
            "queryConfigObjects",
            // parameters for operation
            new Object[] {session, scope, rra, null},
            // signature of bean method to invoke
            new String[] {"com.ibm.websphere.management.Session",
                "javax.management.ObjectName",
                "javax.management.ObjectName",
                "javax.management.QueryExp"});
        rra = matches[0]; // use the first object found at this scope

        // create a data source using the jdbc provider
        ObjectName dataSource =
            createDataSource(adminClient, session, scope, jdbcProv, rra,
                configServiceMBean);

        // if configured to do so, create a Connection Factory on the
        // built-in WebSphere RRA for use by CMP beans
        if (createCMPConnectionFactory) {
            createConnectionFactory(adminClient, session, rra, dataSource,
                configServiceMBean);
        }

        // invoke mbean save operation to persist the changes
        // to the configuration repository, if platform is ND
        // will also need to perform a node sync
        adminClient.invoke(
            configServiceMBean,
            "save",
            // parameters for operation
            new Object[] {session, false},
            // signature of bean method to invoke
            new String[] {"com.ibm.websphere.management.Session",
                "boolean"});
        
        System.out.println("Configuration changes saved");

        // reload data source MBean
        reload(adminClient, session);
    }

    /**
     * Use the ConfigService MBean to create an authentication alias
     */
    private void createAuthAlias(AdminClient adminClient, Session session,
        ObjectName configServiceMBean) throws Exception {

        // Find the parent security object
        ObjectName security =
            ConfigServiceHelper.createObjectName(null, "Security", null);
        // invoke mbean queryConfigObjects operation
        Object result = adminClient.invoke(
            configServiceMBean,
            "queryConfigObjects",
            // parameters for operation
            new Object[] {session, null, security, null},
            // signature of bean method to invoke
            new String[] {"com.ibm.websphere.management.Session",
                "javax.management.ObjectName",
                "javax.management.ObjectName",
                "javax.management.QueryExp"});
        security = ((ObjectName[])result)[0];
        
        // Prepare the attribute list
        AttributeList authAliasAttrs = new AttributeList();
        authAliasAttrs.add(new Attribute("alias", authDataAlias));
        authAliasAttrs.add(new Attribute("userId", authAliasUserID));
        authAliasAttrs.add(new Attribute("password", authAliasPassword));
        authAliasAttrs.add(
            new Attribute("description", authAliasDescription));

        // invoke jmx createConfigData operation
        result = adminClient.invoke(configServiceMBean, "createConfigData",
            // parameters for operation
            new Object[] {session, security, "authDataEntries",
            "JAASAuthData", authAliasAttrs},
            // signature of bean method to invoke
            new String[] {"com.ibm.websphere.management.Session",
                "javax.management.ObjectName",
                "java.lang.String",
                "java.lang.String",
                "javax.management.AttributeList"});
        
        System.out.println("Created authorization alias: " + authDataAlias);
    }

    /*
     * Use the ConfigService MBean to create a CMP connection factory
     * on the built-in WebSphere RRA
     */
    private void createConnectionFactory(AdminClient adminClient,
        Session session, ObjectName rra, ObjectName dataSource,
        ObjectName configServiceMBean)
        throws Exception {
        
        // Prepare the attribute list
        AttributeList cfAttrs = new AttributeList();
        cfAttrs.add(new Attribute("name", dataSourceName + "_CF"));
        cfAttrs .add(new Attribute("authMechanismPreference",
            "BASIC_PASSWORD"));
        cfAttrs.add(new Attribute("authDataAlias", authDataAlias));
        cfAttrs.add(new Attribute("cmpDatasource", dataSource));
        
        // invoke jmx queryTemplates operation
        Object result = adminClient.invoke(
            configServiceMBean,
            "queryTemplates",
            // parameters for operation
            new Object[] {session, "CMPConnectorFactory",},
            // signature of bean method to invoke
            new String[] {"com.ibm.websphere.management.Session",
                "java.lang.String"});

        // find the template with the display name attribute that you want
        ObjectName connFactTemplate = null;
        if (result != null) {
            ObjectName[] templates = (ObjectName[])result;
            for (ObjectName template: templates) {
                if (cmpConnFactTemplateName.equals(template.getKeyProperty(
                    SystemAttributes._WEBSPHERE_CONFIG_DATA_DISPLAY_NAME))) {
                    connFactTemplate = template;
               }
            }
        }

        // use the previous template to create the CMP connection factory
        // invoke jmx createConfigDataByTemplate operation
        adminClient.invoke(
            configServiceMBean,
            "createConfigDataByTemplate",
            // parameters for operation
            new Object[] {session, rra, "CMPConnectorFactory",
                cfAttrs, connFactTemplate},
            // signature of bean method to invoke
            new String[] {"com.ibm.websphere.management.Session",
                "javax.management.ObjectName",
                "java.lang.String",
                "javax.management.AttributeList",
                "javax.management.ObjectName"
                });

        System.out.println("Created CMP Connection factory: " +
            dataSourceName + "_CF");
    }

    /**
     * Use the ConfigService MBean to create a data source at the
     * specified scope from one of the predefined templates
     */
    private ObjectName createDataSource(AdminClient adminClient,
        Session session, ObjectName scope, ObjectName jdbcProv,
        ObjectName rra, ObjectName configServiceMBean)
        throws Exception {

        // the template name to use based on whether this example is
        // configured to use an XA data source or not
        String templateName = dataSourceProviderTemplateNameXA;
        if (!createXAJDBCProvider) {
            templateName = dataSourceTemplateName;
        }
        
        // the attribute DataSource.relationResourceAdapter is required
        // in addition to the attributes in the template
        AttributeList dsAttrs = new AttributeList();
        dsAttrs.add(new Attribute("name", dataSourceName));
        // override some other props in the template
        dsAttrs.add(new Attribute("description", dataSourceName));
        dsAttrs.add(new Attribute("jndiName", "jdbc/" + dataSourceName));
        dsAttrs.add(new Attribute("datasourceHelperClassname",
            dataSourceHelperClassName));
        // link to the built-in WebSphere RRA
        dsAttrs.add(new Attribute("relationalResourceAdapter", rra));
        dsAttrs.add(new Attribute("authDataAlias", authDataAlias));

        // invoke jmx queryTemplates operation
        Object result = adminClient.invoke(
            configServiceMBean,
            "queryTemplates",
            // parameters for operation
            new Object[] {session, "DataSource"},
            // signature of bean method to invoke
            new String[] {"com.ibm.websphere.management.Session",
                "java.lang.String"});

        // find the template with the display name attribute that you want
        ObjectName db2Template = null;
        if (result != null) {
            ObjectName[] templates = (ObjectName[])result;
            for (ObjectName template: templates) {
                if (templateName.equals(template.getKeyProperty(
                    SystemAttributes._WEBSPHERE_CONFIG_DATA_DISPLAY_NAME))) {
                    db2Template = template;
               }
            }
        }

        // use the previous template to create the data source
        // invoke jmx createConfigDataByTemplate operation
        ObjectName dataSource = (ObjectName)adminClient.invoke(
            configServiceMBean,
            "createConfigDataByTemplate",
            // parameters for operation
            new Object[] {session, jdbcProv, "DataSource",
                dsAttrs, db2Template},
            // signature of bean method to invoke
            new String[] {"com.ibm.websphere.management.Session",
                "javax.management.ObjectName",
                "java.lang.String",
                "javax.management.AttributeList",
                "javax.management.ObjectName"
                });

        System.out.println("Created data source: " + dataSourceName +
            " at " + (createNodeScopedCfgObjs ? "node" : "server") +
            " scope");
        return dataSource;
    }

    /**
     * Get the DataSourceCfgHelper MBean and call reload() on it
     * This causes the newly created configuration objects to
     * be available.
     */
    private void reload(AdminClient adminClient, Session session)
        throws Exception {

        // retrieve the DataSourceCfgHelper MBean
        ObjectName mBean =
            retrieveJMXMBean(adminClient, "DataSourceCfgHelper");

        // call the reload operation
        Object result =
            adminClient.invoke(
                mBean,
                "reload",
                new Object[] {},
                new String[] {});

        if (result != null) {
            System.err.println(
                "DataSourceCfgHelper MBean reload operation failed: "
                + result);
        }
        else {
            System.out.println("Reloaded DataSourceCfgHelper MBean");
        }
    }
    
    /**
     * Use the ConfigService MBean to create a jdbc provider at the specified
     * scope from one of the predefined templates
     */
    private ObjectName createJDBCProvider(
        AdminClient adminClient, Session session, ObjectName scope,
        ObjectName configServiceMBean) throws Exception {

        // the template name to use based on whether this example is
        // configured to use an XA jdbc provider or not
        String templateName = jdbcProviderTemplateNameXA;
        if (!createXAJDBCProvider) {
            templateName = jdbcProviderTemplateName;
        }
                    
        // invoke jmx queryTemplates operation
        Object result = adminClient.invoke(
            configServiceMBean,
            "queryTemplates",
            // parameters for operation
            new Object[] {session, "JDBCProvider"},
            // signature of bean method to invoke
            new String[] {"com.ibm.websphere.management.Session",
                "java.lang.String"});

        // find the template with the display name attribute that you want
        ObjectName db2Template = null;
        if (result != null) {
            ObjectName[] templates = (ObjectName[])result;
            for (ObjectName template: templates) {
                if (templateName.equals(template.getKeyProperty(
                    SystemAttributes._WEBSPHERE_CONFIG_DATA_DISPLAY_NAME))) {
                    db2Template = template;
                }
            }
        }

        // the attribute JDBCProvider.name is required in addition
        // to the attributes in the template
        AttributeList provAttrs = new AttributeList();
        provAttrs.add(new Attribute("name", jdbcProviderName
            + (createXAJDBCProvider ? " (XA)" : "")));
        // override the description in the template
        provAttrs.add(new Attribute("description", jdbcProviderName
            + (createXAJDBCProvider ? " (XA)" : "")));
        
        // use the previous template to create the jdbc provider
        // invoke jmx createConfigDataByTemplate operation
        ObjectName jdbcProvider = (ObjectName)adminClient.invoke(
            configServiceMBean,
            "createConfigDataByTemplate",
            // parameters for operation
            new Object[] {session, scope, "JDBCProvider",
                provAttrs, db2Template},
            // signature of bean method to invoke
            new String[] {"com.ibm.websphere.management.Session",
                "javax.management.ObjectName",
                "java.lang.String",
                "javax.management.AttributeList",
                "javax.management.ObjectName"
                });
        
        System.out.println("Created JDBC provider: " + jdbcProviderName
            + (createXAJDBCProvider ? " (XA)" : "")  +
            " at " + (createNodeScopedCfgObjs ? "node" : "server") +
            " scope");
        return jdbcProvider;
    }

    // find the specified MBean
    @SuppressWarnings("unchecked")
    private ObjectName retrieveJMXMBean(AdminClient adminClient,
        String beanName)
        throws MalformedObjectNameException, ConnectorException {
        // retrieve the ConfigService MBean
        ObjectName mBean = null;
        ObjectName queryName =
            new ObjectName("WebSphere:type=" + beanName + ",*");
        Set names = adminClient.queryNames(queryName, null);
        if (!names.isEmpty()) {
            mBean = (ObjectName) names.iterator().next();
        }
        return mBean;
    }
}