/* * Copyright (c) 1999, 2011, 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 * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.jndi.ldap; import java.io.IOException;import java.util.concurrent.BlockingQueue;import java.util.concurrent.LinkedBlockingQueue;import javax.naming.CommunicationException; final class LdapRequest {     LdapRequest next;   // Set/read in synchronized Connection methods    int msgId;          // read-only     private int gotten = 0;    private BlockingQueue<BerDecoder> replies;    private int highWatermark = -1;    private boolean cancelled = false;    private boolean pauseAfterReceipt = false;    private boolean completed = false;     LdapRequest(int msgId, boolean pause) {        this(msgId, pause, -1);    }     LdapRequest(int msgId, boolean pause, int replyQueueCapacity) {        this.msgId = msgId;        this.pauseAfterReceipt = pause;        if (replyQueueCapacity == -1) {            this.replies = new LinkedBlockingQueue<BerDecoder>();        } else {            this.replies =                new LinkedBlockingQueue<BerDecoder>(replyQueueCapacity);            highWatermark = (replyQueueCapacity * 80) / 100; // 80% capacity        }    }     synchronized void cancel() {        cancelled = true;         // Unblock reader of pending request        // Should only ever have atmost one waiter        notify();    }     synchronized boolean addReplyBer(BerDecoder ber) {        if (cancelled) {            return false;        }         // Add a new reply to the queue of unprocessed replies.        try {            replies.put(ber);        } catch (InterruptedException e) {            // ignore        }         // peek at the BER buffer to check if it is a SearchResultDone PDU        try {            ber.parseSeq(null);            ber.parseInt();            completed = (ber.peekByte() == LdapClient.LDAP_REP_RESULT);        } catch (IOException e) {            // ignore        }        ber.reset();         notify(); // notify anyone waiting for reply        /*         * If a queue capacity has been set then trigger a pause when the         * queue has filled to 80% capacity. Later, when the queue has drained         * then the reader gets unpaused.         */        if (highWatermark != -1 && replies.size() >= highWatermark) {            return true; // trigger the pause        }        return pauseAfterReceipt;    }     synchronized BerDecoder getReplyBer() throws CommunicationException {        if (cancelled) {            throw new CommunicationException("Request: " + msgId +                " cancelled");        }         /*         * Remove a reply if the queue is not empty.         * poll returns null if queue is empty.         */        BerDecoder reply = replies.poll();        return reply;    }     synchronized boolean hasSearchCompleted() {        return completed;    }}