import org.apache.logging.log4j.core.appender.AbstractManager; //导入依赖的package包/类
@SuppressWarnings("resource") // actualJmsManager and jndiManager are managed by the JmsAppender
@Override
public JmsAppender build() {
    JmsManager actualJmsManager = jmsManager;
    JmsManagerConfiguration configuration = null;
    if (actualJmsManager == null) {
        final Properties jndiProperties = JndiManager.createProperties(factoryName, providerUrl, urlPkgPrefixes,
                securityPrincipalName, securityCredentials, null);
        configuration = new JmsManagerConfiguration(jndiProperties, factoryBindingName, destinationBindingName,
                userName, password, false, reconnectIntervalMillis);
        actualJmsManager = AbstractManager.getManager(name, JmsManager.FACTORY, configuration);
    }
    if (actualJmsManager == null) {
        // JmsManagerFactory has already logged an ERROR.
        return null;
    }
    if (layout == null) {
        LOGGER.error("No layout provided for JmsAppender");
        return null;
    }
    try {
        return new JmsAppender(name, filter, layout, ignoreExceptions, actualJmsManager);
    } catch (final JMSException e) {
        //  Never happens since the ctor no longer actually throws a JMSException.
        throw new IllegalStateException(e);
    }
}
 

import org.apache.logging.log4j.core.appender.AbstractManager; //导入依赖的package包/类
public static <T> HookableOutputStreamManager getHookableManager(final String name, final T data, final ManagerFactory<? extends HookableOutputStreamManager, T> factory) {
    return AbstractManager.getManager(name, factory, data);
}
 

import org.apache.logging.log4j.core.appender.AbstractManager; //导入依赖的package包/类
/**
 * Implementations should define their own getManager method and call this method from that to create or get
 * existing managers.
 *
 * @param name The manager name, which should include any configuration details that one might want to be able to
 *             reconfigure at runtime, such as database name, username, (hashed) password, etc.
 * @param data The concrete instance of {@link AbstractFactoryData} appropriate for the given manager.
 * @param factory A factory instance for creating the appropriate manager.
 * @param <M> The concrete manager type.
 * @param <T> The concrete {@link AbstractFactoryData} type.
 * @return a new or existing manager of the specified type and name.
 */
protected static <M extends AbstractDatabaseManager, T extends AbstractFactoryData> M getManager(
        final String name, final T data, final ManagerFactory<M, T> factory
) {
    return AbstractManager.getManager(name, factory, data);
}