com.bt.aloha.util.CollectionHelper.java Source code

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Here is the source code for com.bt.aloha.util.CollectionHelper.java

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/*
 * Aloha Open Source SIP Application Server- https://trac.osmosoft.com/Aloha
 *
 * Copyright (c) 2008, British Telecommunications plc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation; either version 3.0 of the License, or (at your option) any later
 * version.
 *
 * This library 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along
 * with this library; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

package com.bt.aloha.util;

import java.util.Map;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public final class CollectionHelper {

    private static Log log = LogFactory.getLog(CollectionHelper.class);
    private static final int ONE_THOUSAND = 1000;
    private static final int THREE = 3;
    private static final int ONE_HUNDRED = 100;

    private CollectionHelper() {
    }

    public static void destroy(ConcurrentMap<String, Map<String, Object>> transients, String classname) {
        log.debug(String.format("Destroy method called on collection: %s", classname));
        for (Map<String, Object> element : transients.values()) {
            ScheduledFuture<?> future = (ScheduledFuture<?>) element.get("future");
            if (future == null || future.isCancelled() || future.isDone())
                continue;
            if (future.getDelay(TimeUnit.MILLISECONDS) > ONE_HUNDRED) {
                future.cancel(true);
                continue;
            }
            int counter = 0;
            while (!future.isDone() && counter++ < THREE) {
                try {
                    log.debug("Waiting for future to get done for some call...");
                    Thread.sleep(ONE_THOUSAND);
                } catch (InterruptedException e) {
                    log.warn(e.getMessage());
                    continue;
                }
            }
        }
    }
}