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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * 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 a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * If you wish your version of this file to be governed by only the CDDL or
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 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
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 */

package com.sun.enterprise.management.support;


import java.util.Map;
import java.util.HashMap;
import java.util.Collections;

/**
    See also com.sun.enterprise.management.support.SystemInfoImpl
    
    @see com.sun.appserv.management.base.SystemInfo
    @see com.sun.enterprise.management.support.SystemInfoImpl
 */
public final class SystemInfoData {
    private static final SystemInfoData INSTANCE = new SystemInfoData();
    
    private final Map      mPerformanceMillis;
    private final Map      mUnmodifiablePerformanceMillis;
    
    private SystemInfoData() {
        mPerformanceMillis  = Collections.synchronizedMap( new HashMap() );
        mUnmodifiablePerformanceMillis  = Collections.unmodifiableMap( mPerformanceMillis );
    }
    
        public static SystemInfoData
    getInstance() {
        return INSTANCE;
    }
    
    /**
        Add a performance metric.
     */
        public synchronized void
    addPerformanceMillis( final String name, final long millis ) {
        if ( mPerformanceMillis.containsKey( name ) ) {
            throw new IllegalStateException();
        }
        mPerformanceMillis.put( name, millis );
    }
    
    /**
       @return unmodifiable Map of performance data
     */
        public Map
    getPerformanceMillis() {
        return mUnmodifiablePerformanceMillis;
    }
}