/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2008 Sun Microsystems, Inc.
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*/
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package org.opends.server.extensions;
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import java.io.Serializable;
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import java.util.Map;
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import java.util.HashMap;
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import java.util.LinkedHashMap;
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import java.util.concurrent.ConcurrentHashMap;
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/**
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* This class represents serializable entry cache index structures
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* and supporting data types used for the entry cache persistence.
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* Structurally it should be an inner class of FileSystemEntryCache
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* however due to serialization constraints it has been separated.
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*/
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class FileSystemEntryCacheIndex implements Serializable {
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static final long serialVersionUID = 4537634108673038611L;
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/**
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* The file system entry cache instance this index belongs to.
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*/
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transient private FileSystemEntryCache fsEntryCacheInstance;
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/**
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* Backend to checksum/id map for offline state.
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*/
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public Map<String, Long> offlineState;
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/**
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* The mapping between backends and ID to DN maps.
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*/
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public Map<String, Map<Long, String>> backendMap;
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/**
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* The mapping between DNs and IDs.
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*/
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public Map<String, Long> dnMap;
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/**
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* Index constructor.
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* @param fsEntryCacheInstance The File System Entry Cache instance
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* this index is associated with.
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* @param accessOrder The ordering mode for the index map
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* {@code true} for access-order,
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* {@code false} for insertion-order.
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*/
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protected FileSystemEntryCacheIndex(
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FileSystemEntryCache fsEntryCacheInstance, boolean accessOrder) {
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this.fsEntryCacheInstance = fsEntryCacheInstance;
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offlineState =
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new ConcurrentHashMap<String, Long>();
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backendMap =
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new HashMap<String, Map<Long, String>>();
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dnMap =
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new LinkedHashMapRotator<String,Long>(
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16, (float) 0.75, accessOrder);
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}
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/**
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* This inner class exist solely to override <CODE>removeEldestEntry()</CODE>
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* method of the LinkedHashMap.
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*
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* @see java.util.LinkedHashMap
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*/
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private class LinkedHashMapRotator<K,V> extends LinkedHashMap<K,V> {
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static final long serialVersionUID = 5271482121415968435L;
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/**
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* Linked Hash Map Rotator constructor.
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* @param initialCapacity The initial capacity.
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* @param loadFactor The load factor.
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* @param accessOrder The ordering mode - {@code true} for
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* access-order, {@code false} for
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* insertion-order.
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*/
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public LinkedHashMapRotator(int initialCapacity,
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float loadFactor,
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boolean accessOrder) {
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super(initialCapacity, loadFactor, accessOrder);
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}
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/**
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* This method will get called each time we add a new key/value
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* pair to the map. The eldest entry will be selected by the
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* underlying LinkedHashMap implementation based on the access
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* order configured and will follow either FIFO implementation
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* by default or LRU implementation if configured so explicitly.
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* @param eldest The least recently inserted entry in the map,
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* or if this is an access-ordered map, the least
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* recently accessed entry.
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* @return boolean {@code true} if the eldest entry should be
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* removed from the map; {@code false} if it
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* should be retained.
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*/
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@Override protected boolean removeEldestEntry(Map.Entry eldest) {
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return fsEntryCacheInstance.removeEldestEntry(eldest);
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}
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}
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}
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