| /* |
| * 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 at most 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; |
| } |
| } |