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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gemstone.gemfire.cache;

/**
 * This is the contract that a custom-expiry element must honor.
 * It determines the expiration characteristics for a specific entry in a region.
 * Note that if you wish to refer to an implementation of this interface in XML,
 * the implementation must also implement the Declarable interface.
 * 
 * @author jpenney
 *
 */
public interface CustomExpiry extends CacheCallback {

  /**
   * Calculate the expiration for a given entry.
   * Returning null indicates that the
   * default for the region should be used.
   * 
   * The entry parameter should not be used after this method invocation completes.
   * @param entry the entry to calculate the expiration for
   * @return the expiration to be used, null if the region's defaults should be
   * used.
   */
  public ExpirationAttributes getExpiry(Region.Entry entry);
}