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    1   /***
    2    *
    3    * Copyright 2004 Hiram Chirino
    4    *
    5    * Licensed under the Apache License, Version 2.0 (the "License");
    6    * you may not use this file except in compliance with the License.
    7    * You may obtain a copy of the License at
    8    *
    9    * http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   *
    17   **/
    18  package org.codehaus.activemq.journal;
    19
    20  /***
    21   * Defines an object which listens for Journal Events.
    22   *
    23   * @version $Revision: 1.1 $
    24   */
    25  public interface JournalEventListener {
    26
    27  	/***
    28  	 * This event is issues when a Journal implementations wants to recover
    29  	 * disk space used by old records.  If journal space is not reliquised
    30  	 * by setting the Journal's mark at or past the <code>safeLocation</code>
    31  	 * further write opperations against the Journal may casuse IOExceptions
    32  	 * to occur due to a log overflow condition.
    33  	 *
    34  	 * @param safeLocation the oldest location that the journal recomends the mark to be set.
    35  	 */
    36  	void overflowNotification(RecordLocation safeLocation);
    37
    38  }