functionenvvar.java

High performance DB query

/*
 * @(#)$Id: FunctionEnvvar.java,v 1.12 2005/07/16 20:08:19 huebsch Exp $
 *
 * Copyright (c) 2001-2004 Regents of the University of California.
 * All rights reserved.
 *
 * This file is distributed under the terms in the attached BERKELEY-LICENSE
 * file. If you do not find these files, copies can be found by writing to:
 * Computer Science Division, Database Group, Universite of California,
 * 617 Soda Hall #1776, Berkeley, CA 94720-1776. Attention: Berkeley License
 *
 * Copyright (c) 2003-2004 Intel Corporation. All rights reserved.
 *
 * This file is distributed under the terms in the attached INTEL-LICENSE file.
 * If you do not find these files, copies can be found by writing to:
 * Intel Research Berkeley, 2150 Shattuck Avenue, Suite 1300,
 * Berkeley, CA, 94704.  Attention:  Intel License Inquiry.
 */


package pier.helpers.functions;

import applications.overlay.OverlayNodeMaker;
import java.net.InetSocketAddress;
import overlay.provider.Provider;
import pier.components.PierFrontend;
import services.LocalNode;

/**
 * Class FunctionEnvvar
 *
 */
public class FunctionEnvvar implements Function {

    /**
     * Method evaluate
     *
     * @param parameters
     * @return
     */
    public Object evaluate(Object[] parameters) {
        int params = parameters.length;

        if (params == 1) {
            if (parameters[0].toString().equalsIgnoreCase("IPADDR")) {
                return LocalNode.myIPAddress.getHostAddress().toString();
            }

            if (parameters[0].toString().equalsIgnoreCase("IPADDRT")) {
                return LocalNode.myIPAddress;
            }

            if (parameters[0].toString().equalsIgnoreCase("PIERPORT")) {
                return String.valueOf(PierFrontend.pierPort);
            }

            if (parameters[0].toString().equalsIgnoreCase("PIERPORTT")) {
                return new Integer(PierFrontend.pierPort);
            }

            if (parameters[0].toString().equalsIgnoreCase("IPSOCK")) {
                return LocalNode.myIPAddress.getHostAddress().toString() + ":"
                       + String.valueOf(PierFrontend.pierPort);
            }

            if (parameters[0].toString().equalsIgnoreCase("IPSOCKT")) {
                return new InetSocketAddress(LocalNode.myIPAddress,
                                             PierFrontend.pierPort);
            }

            if (parameters[0].toString().equalsIgnoreCase("TIME")) {
                return String.valueOf(LocalNode.myTimer.getCurrentTime());
            }

            if (parameters[0].toString().equalsIgnoreCase("TIMET")) {
                return new Double(LocalNode.myTimer.getCurrentTime());
            }

            if (parameters[0].toString().equalsIgnoreCase("NODEID")) {
                return ((Provider) LocalNode.myGlobals[OverlayNodeMaker.PROVIDER_POS]).getNodeID();
            }

            if (parameters[0].toString().equalsIgnoreCase("MEMFREEGC")) {
                System.gc();

                return new Long(Runtime.getRuntime().freeMemory());
            }

            if (parameters[0].toString().equalsIgnoreCase("MEMFREE")) {
                return new Long(Runtime.getRuntime().freeMemory());
            }

            if (parameters[0].toString().equalsIgnoreCase("MEMUSEDGC")) {
                System.gc();

                return new Long(Runtime.getRuntime().totalMemory()
                                - Runtime.getRuntime().freeMemory());
            }

            if (parameters[0].toString().equalsIgnoreCase("MEMUSED")) {
                return new Long(Runtime.getRuntime().totalMemory()
                                - Runtime.getRuntime().freeMemory());
            }

            return null;
        } else {
            return null;
        }
    }

    /**
     * Method cacheable
     * @return
     */
    public boolean cacheable() {
        return false;
    }
}