72 lines
2.8 KiB
Java
72 lines
2.8 KiB
Java
/*
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* Copyright (c) 2003, 2011, 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 com.sun.jndi.ldap.pool;
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import java.lang.ref.WeakReference;
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import java.lang.ref.ReferenceQueue;
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/*
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* This class defines a WeakReference to the ConnectionRef (the referent).
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*
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* The ConnectionRef enables to break the reference
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* cycle between Connection, LdapClient, Connections and ConnectionDesc,
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* shown in the figure below.
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*
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* -------> Connections -----> ConnectionDesc
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* | ^ |
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* | | |
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* | | |
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* ConnectionsRef LdapClient <------------
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* ^ | ^
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* : | |
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* : v |
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* ConnectionsWeakRef Connection
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*
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* The ConnectionsRef is for cleaning up the resources held by the
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* Connection thread by making them available to the GC. The pool
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* uses ConnectionRef to hold the pooled resources.
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*
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* This class in turn holds a WeakReference with a ReferenceQueue to the
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* ConnectionRef to track when the ConnectionRef becomes ready
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* for getting GC'ed. It extends from WeakReference in order to hold a
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* reference to Connections used for closing (which in turn terminates
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* the Connection thread) it by monitoring the ReferenceQueue.
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*/
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class ConnectionsWeakRef extends WeakReference<ConnectionsRef> {
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private final Connections conns;
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ConnectionsWeakRef (ConnectionsRef connsRef,
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ReferenceQueue<? super ConnectionsRef> queue) {
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super(connsRef, queue);
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this.conns = connsRef.getConnections();
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}
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Connections getConnections() {
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return conns;
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}
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}
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