118 lines
4.8 KiB
Java
118 lines
4.8 KiB
Java
/*
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* Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.management.snmp.util;
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import com.sun.jmx.snmp.SnmpOid;
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import java.io.Serializable;
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import java.util.Comparator;
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import java.util.Arrays;
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import java.util.TreeMap;
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import java.util.List;
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import java.util.Iterator;
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import java.lang.ref.WeakReference;
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/**
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* This abstract class implements a weak cache for a table whose data
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* is obtained from a {@link List}.
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*
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* <p><b>NOTE: This class is not synchronized, subclasses must implement
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* the appropriate synchronization whwn needed.</b></p>
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**/
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public abstract class SnmpListTableCache extends SnmpTableCache {
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/**
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* The index of the entry corresponding to the given <var>item</var>.
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* <br>This method is called by {@link #updateCachedDatas(Object,List)}.
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* The given <var>item</var> is expected to be always associated with
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* the same index.
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* @param context The context passed to
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* {@link #updateCachedDatas(Object,List)}.
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* @param rawDatas Raw table datas passed to
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* {@link #updateCachedDatas(Object,List)}.
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* @param rank Rank of the given <var>item</var> in the
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* <var>rawDatas</var> list iterator.
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* @param item The raw data object for which an index must be determined.
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**/
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protected abstract SnmpOid getIndex(Object context, List<?> rawDatas,
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int rank, Object item);
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/**
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* The data for the entry corresponding to the given <var>item</var>.
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* <br>This method is called by {@link #updateCachedDatas(Object,List)}.
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* @param context The context passed to
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* {@link #updateCachedDatas(Object,List)}.
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* @param rawDatas Raw table datas passed to
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* {@link #updateCachedDatas(Object,List)}.
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* @param rank Rank of the given <var>item</var> in the
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* <var>rawDatas</var> list iterator.
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* @param item The raw data object from which the entry data must be
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* extracted.
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* @return By default <var>item</var> is returned.
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**/
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protected Object getData(Object context, List<?> rawDatas,
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int rank, Object item) {
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return item;
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}
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/**
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* Recompute cached data.
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* @param context A context object, valid during the duration of
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* of the call to this method, and that will be passed to
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* {@link #getIndex} and {@link #getData}. <br>
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* This method is intended to be called by
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* {@link #updateCachedDatas(Object)}. It is assumed that
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* the context is be allocated by before this method is called,
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* and released just after this method has returned.<br>
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* This class does not use the context object: it is a simple
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* hook for subclassed.
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* @param rawDatas The table datas from which the cached data will be
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* computed.
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* @return the computed cached data.
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**/
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protected SnmpCachedData updateCachedDatas(Object context, List<?> rawDatas) {
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final int size = ((rawDatas == null)?0:rawDatas.size());
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if (size == 0) return null;
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final long time = System.currentTimeMillis();
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final Iterator<?> it = rawDatas.iterator();
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final TreeMap<SnmpOid, Object> map =
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new TreeMap<>(SnmpCachedData.oidComparator);
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for (int rank=0; it.hasNext() ; rank++) {
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final Object item = it.next();
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final SnmpOid index = getIndex(context, rawDatas, rank, item);
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final Object data = getData(context, rawDatas, rank, item);
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if (index == null) continue;
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map.put(index,data);
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}
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return new SnmpCachedData(time,map);
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}
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}
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