JDK8/Java8源码在线阅读

/*
 * Copyright (c) 2002, 2003, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.sun.jndi.ldap.pool;

/**
 * Is a reference to Connections that is stored in Pool.
 * This is an intermediate object that is outside of the circular
 * reference loop of
 *  com.sun.jndi.ldap.Connection <-> com.sun.jndi.ldap.LdapClient
 *    <-> com.sun.jndi.ldap.pool.Connections
 *
 * Because Connection is a daemon thread, it will keep LdapClient
 * alive until LdapClient closes Connection. This will in turn
 * keep Connections alive. So even when Connections is removed
 * from (the WeakHashMap of) Pool, it won't be finalized.
 * ConnectionsRef acts as Connections's finalizer.
 *
 * Without connection pooling, com.sun.jndi.ldap.LdapCtx's finalize()
 * closes LdapClient, which in turn closes Connection.
 * With connection pooling, ConnectionsRef's finalize() calls
 * Connections.close(), which in turn will close all idle connections
 * and mark Connections such that in-use connections will be closed

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