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/*
* @(#)MapEntry.java 1.8 06/29/07
*/
package com.sun.messaging.jmq.jmsserver.service.imq.group;
import java.util.*;
import java.lang.reflect.*;
import java.io.*;
import java.nio.channels.spi.*;
import java.nio.channels.*;
import com.sun.messaging.jmq.util.log.*;
import com.sun.messaging.jmq.jmsserver.Globals;
import com.sun.messaging.jmq.jmsserver.service.imq.*;
import com.sun.messaging.jmq.jmsserver.service.*;
import com.sun.messaging.jmq.jmsserver.resources.*;
import com.sun.messaging.jmq.jmsserver.pool.*;
import com.sun.messaging.jmq.jmsserver.util.BrokerException;
import com.sun.messaging.jmq.jmsserver.net.Protocol;
import com.sun.messaging.jmq.jmsserver.net.ProtocolStreams;
import com.sun.messaging.jmq.jmsserver.data.PacketRouter;
class MapEntry {
Logger logger = Globals.getLogger();
int min = 0;
List l = null;
Class selectClass = null;
int mask = 0;
int limit = 0;
GroupService svc = null;
public MapEntry(GroupService svc, int min, int limit, Class selectClass, int mask) {
this.svc = svc;
this.min = min;
this.limit = limit;
this.selectClass = selectClass;
this.mask = mask;
l = new ArrayList();
}
public Hashtable getDebugState() {
Hashtable ht = new Hashtable();
try {
ht.put("MapEntry", String.valueOf(this.hashCode()));
ArrayList mylist = null;
synchronized(this) {
if (l != null)
mylist = new ArrayList(l);
}
logger.log(Logger.INFO,"... ... ... Dumping MapEntry" + this.hashCode());
Hashtable thrInfo = new Hashtable();
for (int i =0; mylist != null && i < mylist.size(); i ++) {
SelectThread thr = (SelectThread)mylist.get(i);
logger.log(Logger.INFO,"... ... ... .... thread info " + thr.toString());
thrInfo.put(String.valueOf(i), thr.getDebugState());
}
ht.put("SelectThreads", thrInfo);
if (mylist != null)
ht.put("SelectThreadCnt", String.valueOf( mylist.size()));
if (svc != null)
ht.put("Service", svc.getName());
ht.put("min", String.valueOf(min));
ht.put("limit", String.valueOf(limit));
ht.put("mask", String.valueOf(mask));
} catch (Exception ex) {
ht.put("Exception ", ex.toString());
logger.log(Logger.INFO,"Error dumping ", ex);
}
return ht;
}
public synchronized void destroy(String reason) {
for (int i =0; i < l.size(); i ++) {
SelectThread thr = (SelectThread)l.get(i);
thr.destroy(reason);
}
l.clear();
}
public boolean checkRemoveThread(SelectThread thr, boolean force) {
boolean free = false;
synchronized (this) {
int indx = l.indexOf(thr);
if (force || (thr != null && !thr.isValid()) || (indx == -1 || indx > min)) {
l.remove(thr);
free = true;
}
}
if (free) {
GroupRunnable grp= thr.getParent();
if (grp != null)
grp.freeThread();
else if (thr.isValid())
thr.destroy("Unused thread");
return true;
}
return false;
}
public synchronized SelectThread findThread() {
// find the best in list, cleaning up any old entries
Iterator itr = l.iterator();
SelectThread selthr = null;
int size = 0;
while (itr.hasNext()) {
SelectThread thr = (SelectThread)itr.next();
if (!thr.isValid()) {
itr.remove();
continue;
}
if (limit == GroupService.UNLIMITED || thr.size() < limit) {
if (selthr == null || thr.size() < size) {
selthr = thr;
size = thr.totalSize();
size = thr.size();
}
}
}
if ((selthr != null && selthr.totalSize() > 0 && l.size() < min) || selthr == null) { // create a new one !!!
boolean finished = false;
int attempt = 0;
int max_attempt=5;
while (!finished && attempt < max_attempt) {
try {
Class [] args={Service.class, MapEntry.class};
Object [] objs={svc, this};
GroupRunnable runner = null;
synchronized (svc) {
runner = (GroupRunnable)
svc.getPool().getAvailRunnable(false);
if (runner != null ) { // threads are available
Constructor con = selectClass.getConstructor(args);
selthr = (SelectThread) con.newInstance(objs);
l.add(selthr);
runner.assignThread(selthr, mask);
finished = true;
} else {
finished = true;
throw new Exception("no threads available from pool " + l.size());
}
}
} catch (Exception ex) {
// something internal went wrong, try to recover
Globals.getLogger().logStack(Logger.ERROR,
BrokerResources.E_INTERNAL_BROKER_ERROR,
"error creating a selector.", ex);
attempt ++;
}
}
}
return selthr;
}
}
