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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2001 by Sun Microsystems, Inc.
* All rights reserved.
*
*/
// PermSARegTable.java: Periodically reregister registrations.
// Author: James Kempf
// Created On: Thu May 14 14:11:49 1998
// Last Modified By: James Kempf
// Last Modified On: Thu Jan 28 14:53:43 1999
// Update Count: 36
//
package com.sun.slp;
import java.net.*;
import java.io.*;
import java.util.*;
/**
* Periodically reregister advertisments in the SA client.
*
* @author Erik Guttman, James Kempf
*/
class PermSARegTable extends Thread {
private Hashtable htRegs;
private SLPConfig config;
private final static long INCREMENT = Defaults.lMaxSleepTime / 2L;
// 9 hours...
private final static long SLEEPY_TIME = INCREMENT / 2L;
// 4 hours, more or less...
// We use these indicies for record access. We should use a class
// here, but it's another 1K!
private final static int TIME = 0;
private final static int REG = 1;
PermSARegTable(SLPConfig config) {
htRegs = new Hashtable();
this.config = config;
start();
}
// We just lock the hashtable when we need to update. Otherwise, we
// get into deadlock if an outgoing request is being made when
// somebody else wants to get into this class to look something
// up.
void reg(ServiceURL URL, CSrvReg sr) {
// Make up a record for the table.
Object[] rec =
new Object[] {
new Long(System.currentTimeMillis() + INCREMENT),
sr};
// Note that we do not account for multiple nonservice: URLs under
// separate type names, because that is disallowed by the protocol.
htRegs.put(URL, rec);
}
// Remove
void dereg(ServiceURL URL) {
htRegs.remove(URL);
}
// Send off the vector of registations for expired advertisements.
private void send(SrvLocMsg reg) {
InetAddress addr = config.getLoopback();
try {
Transact.transactTCPMsg(addr, reg, true);
} catch (ServiceLocationException ex) {
config.writeLog("periodic_exception",
new Object[] {new Short(ex.getErrorCode()),
ex.getMessage()});
} catch (IllegalArgumentException iae) {
Assert.slpassert(false, "reregister_bug", new Object[0]);
}
}
// Walk the registration table, collecting registrations
// to reregister. We synchronize on this method to close
// the window between when the table is walked and
// when the registration is sent
// during which the client may deregister the URL but
// it is reregistered anyway.
private synchronized void walk() {
Enumeration e;
long lnow = System.currentTimeMillis();
e = htRegs.keys();
while (e.hasMoreElements()) {
ServiceURL url = (ServiceURL)e.nextElement();
Object[] rec = (Object[])htRegs.get(url);
long xtime = ((Long)rec[TIME]).longValue();
// If the deadline to refresh passed, then do it.
if (xtime <= lnow) {
send((SrvLocMsg)rec[REG]);
rec[TIME] = new Long(lnow + INCREMENT);
}
}
}
public void run() {
setName("SLP PermSARegTable");
while (true) {
try {
// Sleep for half the reregistration interval (which itself
// is half the lifetime of the URLs.
sleep(SLEEPY_TIME);
} catch (InterruptedException ie) {
}
walk();
}
}
}
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