001/*
002 * jPOS Project [http://jpos.org]
003 * Copyright (C) 2000-2026 jPOS Software SRL
004 *
005 * This program is free software: you can redistribute it and/or modify
006 * it under the terms of the GNU Affero General Public License as
007 * published by the Free Software Foundation, either version 3 of the
008 * License, or (at your option) any later version.
009 *
010 * This program is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013 * GNU Affero General Public License for more details.
014 *
015 * You should have received a copy of the GNU Affero General Public License
016 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
017 */
018
019package org.jpos.q2.cli;
020
021import org.jpos.q2.CLICommand;
022import org.jpos.q2.CLIContext;
023
024/** CLI command that prints JVM heap usage statistics; supports {@code --gc}. */
025public class MEM implements CLICommand
026{
027    /** Default constructor; no instance state to initialise. */
028    public MEM() {}
029    public void exec(CLIContext cli, String[] args) throws Exception
030    {
031        if (args.length > 1 && "--gc".equals(args[1]))
032        {
033            System.gc();
034        }
035        Runtime r = Runtime.getRuntime();
036        StringBuilder sb = new StringBuilder();
037        sb.append("total=");
038        sb.append(r.totalMemory());
039        sb.append(" free=");
040        sb.append(r.freeMemory());
041        sb.append(" in-use=");
042        sb.append(r.totalMemory() - r.freeMemory());
043        cli.println(sb.toString());
044    }
045}
046