/*
*
* Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
// Copyright (c) 1995-96 by Cisco Systems, Inc.
package com.sun.jmx.snmp.daemon;
import java.util.Enumeration;
import java.util.logging.Level;
import java.util.Vector;
// import debug stuff
//
import static com.sun.jmx.defaults.JmxProperties.SNMP_ADAPTOR_LOGGER;
/**
* This class starts a thread which picks up a session from the queue
* and prepares the inform request protocol data unit (PDU) packet and sends
* it to the manager. The request is then added to the wait queue and
* marked as one that is waiting for a response.
*/
final class SnmpSendServer extends Thread {
// VARIABLES
//----------
private int intervalRange = 5 * 1000 ;
private Vector readyPool ;
SnmpQManager snmpq = null ;
// This boolean is used to stop handling requests while the corresponding SnmpQManager
// is being destroyed.
//
boolean isBeingDestroyed = false;
// CONSTRUCTORS
//-------------
public SnmpSendServer(ThreadGroup grp, SnmpQManager q) {
super(grp, "SnmpSendServer") ;
snmpq = q ;
start() ;
}
public synchronized void stopSendServer() {
if (isAlive()) {
interrupt();
try {
// Wait until the thread die.
//
join();
} catch (InterruptedException e) {
// Ignore...
}
}
}
public void run() {
Thread.currentThread().setPriority(Thread.NORM_PRIORITY);
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
SNMP_ADAPTOR_LOGGER.logp(Level.FINER, SnmpSendServer.class.getName(),
"run", "Thread Started");
}
while (true) {
try {
prepareAndSendRequest() ;
if (isBeingDestroyed == true)
break;
} catch (Exception anye) {
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(Level.FINEST, SnmpSendServer.class.getName(),
"run", "Exception in send server", anye);
}
} catch (ThreadDeath td) {
// This is not good but Netscape does kill all threads when
// the pagecontext changes.
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(Level.FINEST, SnmpSendServer.class.getName(),
"run", "Exiting... Fatal error");
}
throw td ;
} catch (OutOfMemoryError ome) {
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(Level.FINEST, SnmpSendServer.class.getName(),
"run", "Out of memory");
}
} catch (Error err) {
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(Level.FINEST, SnmpSendServer.class.getName(),
"run", "Got unexpected error", err);
}
throw err ;
}
}
}
private void prepareAndSendRequest() {
if (readyPool == null || readyPool.isEmpty()) {
// wait to be signaled by the an active request.
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
SNMP_ADAPTOR_LOGGER.logp(Level.FINER, SnmpSendServer.class.getName(),
"prepareAndSendRequest", "Blocking for inform requests");
}
readyPool = snmpq.getAllOutstandingRequest(intervalRange) ;
if (isBeingDestroyed == true)
return;
} else {
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(Level.FINEST, SnmpSendServer.class.getName(),
"prepareAndSendRequest", "Inform requests from a previous block left unprocessed. Will try again");
}
}
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
SNMP_ADAPTOR_LOGGER.logp(Level.FINER, SnmpSendServer.class.getName(),
"prepareAndSendRequest", "List of inform requests to send : " + reqListToString(readyPool));
}
synchronized(this) {
if (readyPool.size() < 2) {
// Fire all requests as independent requests.
fireRequestList(readyPool) ;
return ;
}
while (!readyPool.isEmpty()) {
SnmpInformRequest req = (SnmpInformRequest) readyPool.lastElement() ;
if (req != null && req.inProgress()) {
fireRequest(req) ;
}
readyPool.removeElementAt(readyPool.size() - 1) ;
}
readyPool.removeAllElements() ;
}
}
/**
* This will fire the specified request.
*/
void fireRequest(SnmpInformRequest req) {
if (req != null && req.inProgress()) {
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
SNMP_ADAPTOR_LOGGER.logp(Level.FINER, SnmpSendServer.class.getName(),
"fireRequest", "Firing inform request directly. -> " + req.getRequestId());
}
req.action() ;
}
}
void fireRequestList(Vector reqList) {
// Fire all requests as independent requests.
while (!reqList.isEmpty()) {
SnmpInformRequest req = (SnmpInformRequest) reqList.lastElement() ;
if (req != null && req.inProgress())
fireRequest(req) ;
reqList.removeElementAt(reqList.size() - 1) ;
}
}
final String reqListToString(Vector vec) {
StringBuffer s = new StringBuffer(vec.size() * 100) ;
Enumeration dbge = vec.elements() ;
while (dbge.hasMoreElements()) {
SnmpInformRequest reqc = (SnmpInformRequest) dbge.nextElement() ;
s.append("InformRequestId -> ") ;
s.append(reqc.getRequestId()) ;
s.append(" / Destination -> ") ;
s.append(reqc.getAddress()) ;
s.append(". ") ;
}
String str = s.toString() ;
s = null ;
return str ;
}
}