/*
* 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.
*
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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;
}
}