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 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
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 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
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 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
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package com.sun.appserv.management.base;

import java.util.Map;


/**
	Provides information about the capabilities of the running server.
	Callers should check only for specific capabilities, never whether
	the server is PE/SE/EE, since the feature assortment could vary with
	release.
 */
public interface SystemInfo extends AMX
{
/** The j2eeType as returned by {@link com.sun.appserv.management.base.AMX#getJ2EEType}. */
	public static final String	J2EE_TYPE			= XTypes.SYSTEM_INFO;
	
	/**
		Call supportsFeature() with this value to determine if the server
		supports clusters.
	 */
	public final String	CLUSTERS_FEATURE	= "SupportsClusters";
	
	/**
		Call supportsFeature() with this value to determine if the server
		supports more than one server.
	 */
	public final String	MULTIPLE_SERVERS_FEATURE	= "SupportsMultipleServers";
	
	
	/**
		Call supportsFeature() with this value to determine if this MBean
		is running in the Domain Admin Server.
	 */
	public final String	RUNNING_IN_DAS_FEATURE		= "RunningInDomainAdminServer";
	
    
	/**
		Call supportsFeature() with this value to determine if the
        high availability feature (HADB) is available.
	 */
    public final String HADB_CONFIG_FEATURE    = "HighAvailabilityDatabase";
	
	
	/**
		Query whether a feature is supported.  Features require the use
		of a key, which may be any of:
		<ul>
		<li>CLUSTERS_FEATURE</li>
		<li>MULTIPLE_SERVERS_FEATURE</li>
		<li>RUNNING_IN_DAS_FEATURE</li>
		</ul>
		
		@param key	the feature to query
	 */
	public boolean	supportsFeature( String key );
	
	/**
		Return all features names.
		
		@return Set
	 */
	public String[]		getFeatureNames();
    
    

    /**
        Key for time for server to complete its startup sequence.  The presence of this item
        in the Map returned by {@link #getPerformanceMillis} indicates that the server has
        completed its startup sequence. However, some server features might still be initializing
        asynchronously, or might be lazily loaded.
        @see #getPerformanceMillis
     */
    public static final String  STARTUP_SEQUENCE_MILLIS_KEY    = "StartupMillis";

    /**
        Return a Map keyed by an arbitrary String denoting some feature.  The value
        is the time in milliseconds.  Code should not rely on the keys as they are subject to 
        changes, additions, or removal at any time, except as otherwise documented.
        Even documented items should be used only for informational purposes,
        such as assessing performance.
        
         @return Map<String,Long>
     */
    public Map<String,Long> getPerformanceMillis();
}