/*

 * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package gc.g1.unloading.check;

import java.util.*;

/**

 * This is the storage for assertions. Here assertions are stored until required number of garbage collections happen.

 * This container isn't thread-safe.

 */

public class AssertionContainer {

    private SortedMap<Long, List<Assertion>> sortedMap = new TreeMap<>();

    /**

     * Enqueue assertion to storage.

     * @param assertions

     * @param gcCounter - gc counter value as of assertion created

     */

    public void enqueue(Collection<Assertion> assertions, Long gcCounter) {

        if (sortedMap.get(gcCounter) != null) {

            sortedMap.get(gcCounter).addAll(assertions);

        } else {

            List<Assertion> newList = new LinkedList<>();

            newList.addAll(assertions);

            sortedMap.put(gcCounter, newList);

        }

    }

    /**

     * Get assertions that are ready for check. That means they where created when gc counter was less then

     * specified value.

     * @param bound - value of gc counter

     * @return - collection of assertions. It can be empty if no assertions are mature yet.

     */

    public Collection<Assertion> getElder(Long bound) {

        Collection<Assertion> returnValue = new LinkedList<>();

        SortedMap<Long, List<Assertion>> filteredView = sortedMap.headMap(bound);

        for (Long l : filteredView.keySet()) {

            List<Assertion> list = filteredView.remove(l);

            returnValue.addAll(list);

        }

        return returnValue;

    }

}