// --- BEGIN COPYRIGHT BLOCK ---
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package com.netscape.certsrv.logging;

import java.util.Hashtable;
import java.util.Vector;

import com.netscape.certsrv.base.ISubsystem;

/**
 * An interface that represents a logging component. The logging
 * component is a framework that handles different types of log types,
 * each represented by an ILogEventListener, and each implements a log
 * plugin. CMS comes
 * with three standard log types: "signedAudit", "system", and
 * "transaction". Each log plugin can be instantiated into log
 * instances. Each log instance can be individually configured and is
 * associated with its own configuration entries in the configuration file.
 * <P>
 * 
 * @version $Revision$, $Date$
 */
public interface ILogSubsystem extends ISubsystem {

    /**
     * The ID of this component
     */
    public static final String ID = "log";

    /**
     * Retrieve plugin name (implementation name) of the log event
     * listener. If no plug name found, an empty string is returned
     * 
     * @param log the log event listener
     * @return the log event listener's plugin name
     */
    public String getLogPluginName(ILogEventListener log);

    /**
     * Retrieve the log event listener by instance name
     * 
     * @param insName the log instance name in String
     * @return the log instance in ILogEventListener
     */
    public ILogEventListener getLogInstance(String insName);

    /**
     * get the list of log plugins that are available
     * 
     * @return log plugins in a Hashtable. Each entry in the
     *         Hashtable contains the name/value pair of pluginName/LogPlugin
     * @see LogPlugin
     */
    public Hashtable<String, LogPlugin> getLogPlugins();

    /**
     * get the list of log instances that are available
     * 
     * @return log instances in a Hashtable. Each entry in the
     *         Hashtable contains the name/value pair of instName/ILogEventListener
     * @see LogPlugin
     */
    public Hashtable<String, ILogEventListener> getLogInsts();

    /**
     * Get the default configuration parameter names associated with a
     * plugin. It is used by
     * administration servlet to handle log configuration when a new
     * log instance is added.
     * 
     * @param implName The implementation name for which the
     *            configuration parameters are to be configured
     * @return a Vector of default configuration paramter names
     *         associated with this log plugin
     * @exception ELogException when instantiation of the plugin
     *                implementation fails.
     */
    public Vector<String> getLogDefaultParams(String implName) throws
            ELogException;

    /**
     * Get the default configuration parameter names associated with a
     * log instance. It is used by administration servlet to handle
     * log instance configuration.
     * 
     * @param insName The instance name for which the configuration
     *            parameters are to be configured
     * @return a Vector of default configuration paramter names
     *         associated with this log instance.
     */
    public Vector<String> getLogInstanceParams(String insName)
            throws ELogException;
}