1 /* 2 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.jndi.ldap; 27 28 import java.io.IOException; 29 import java.util.concurrent.BlockingQueue; 30 import java.util.concurrent.LinkedBlockingQueue; 31 import javax.naming.CommunicationException; 32 import java.util.concurrent.TimeUnit; 33 34 final class LdapRequest { 35 36 private final static BerDecoder EOF = new BerDecoder(new byte[]{}, -1, 0); 37 38 LdapRequest next; // Set/read in synchronized Connection methods 39 final int msgId; // read-only 40 41 private final BlockingQueue<BerDecoder> replies; 42 private volatile boolean cancelled; 43 private volatile boolean closed; 44 private volatile boolean completed; 45 private final boolean pauseAfterReceipt; 46 47 LdapRequest(int msgId, boolean pause, int replyQueueCapacity) { 48 this.msgId = msgId; 49 this.pauseAfterReceipt = pause; 50 if (replyQueueCapacity == -1) { 51 this.replies = new LinkedBlockingQueue<>(); 52 } else { 53 this.replies = new LinkedBlockingQueue<>(8 * replyQueueCapacity / 10); 54 } 55 } 56 57 void cancel() { 58 cancelled = true; 59 replies.offer(EOF); 60 } 61 62 synchronized void close() { 63 closed = true; 64 replies.offer(EOF); 65 } 66 67 private boolean isClosed() { 68 return closed && (replies.size() == 0 || replies.peek() == EOF); 69 } 70 71 synchronized boolean addReplyBer(BerDecoder ber) { 72 // check the closed boolean value here as we don't want anything 73 // to be added to the queue after close() has been called. 74 if (cancelled || closed) { 75 return false; 76 } 77 78 // peek at the BER buffer to check if it is a SearchResultDone PDU 79 try { 80 ber.parseSeq(null); 81 ber.parseInt(); 82 completed = (ber.peekByte() == LdapClient.LDAP_REP_RESULT); 83 } catch (IOException e) { 84 // ignore 85 } 86 ber.reset(); 87 88 // Add a new reply to the queue of unprocessed replies. 89 try { 90 replies.put(ber); 91 } catch (InterruptedException e) { 92 // ignore 93 } 94 95 return pauseAfterReceipt; 96 } 97 98 BerDecoder getReplyBer(long millis) throws CommunicationException, 99 InterruptedException { 100 if (cancelled) { 101 throw new CommunicationException("Request: " + msgId + 102 " cancelled"); 103 } 104 if (isClosed()) { 105 return null; 106 } 107 108 BerDecoder result = millis > 0 ? 109 replies.poll(millis, TimeUnit.MILLISECONDS) : replies.take(); 110 111 if (cancelled) { 112 throw new CommunicationException("Request: " + msgId + 113 " cancelled"); 114 } 115 116 return result == EOF ? null : result; 117 } 118 119 boolean hasSearchCompleted() { 120 return completed; 121 } 122 }