com.sun.grizzly.suspendable.SuspendableMonitor Maven / Gradle / Ivy
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package com.sun.grizzly.suspendable;
import com.sun.grizzly.Controller;
import java.io.IOException;
import java.nio.channels.CancelledKeyException;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.util.Iterator;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.sun.grizzly.suspendable.SuspendableFilter.KeyHandler;
import com.sun.grizzly.util.LinkedTransferQueue;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.SelectableChannel;
/**
* A secondary {@link Selector} used to keep the state of a suspended
* connection ({@link SelectionKey}). See {@link SuspendableFilter} for more info.
*
* TODO: Add Pipelining/Multiplexing support.
* @author Jeanfrancois Arcand
*/
public class SuspendableMonitor {
/**
* The {@link Selector}
*/
private Selector selector;
private LinkedTransferQueue keysToRegister
= new LinkedTransferQueue();
/**
* Logger.
*/
private Logger logger = Controller.logger();
/**
* Start a new Thread with a Selector running.
*/
public SuspendableMonitor() {
start();
}
public void start() {
new Thread("GrizzlySuspendableMonitor") {
{
setDaemon(true);
}
@SuppressWarnings("empty-statement")
@Override
public void run() {
try {
selector = Selector.open();
} catch (IOException ex) {
// Most probably a fd leak.
logger.log(Level.SEVERE, "SuspendableMonitor.open()", ex);
return;
}
while (true) {
SelectionKey foreignKey = null;
KeyHandler kh = null;
int selectorState = 0;
try {
try {
selectorState = selector.select(1000);
} catch (CancelledKeyException ex) {
;
}
Iterator keys =
keysToRegister.iterator();
SelectableChannel channel;
while (keys.hasNext()){
kh = keys.next();
channel = kh.getKey().channel();
if (kh.getKey().isValid() && channel.isOpen()) {
foreignKey = channel
.register(selector,SelectionKey.OP_READ,kh);
kh.setForeignKey(foreignKey);
keys.remove();
}
}
/* readyKeys = selector.selectedKeys();
iterator = readyKeys.iterator();
// TODO: Support pipelining
/* while (iterator.hasNext()) {
key = iterator.next();
if (key.isReadable()) {
//SuspendableMonitor.this.interrupted(key);
}
}*/
expireIdleKeys();
if (selectorState <= 0) {
selector.selectedKeys().clear();
}
} catch (Throwable t) {
logger.log(Level.SEVERE,"SuspendableMonitor",t);
try{
if (kh != null) {
try {
interrupted(kh.getKey());
} catch (Throwable t2) {
logger.log(Level.SEVERE, "SuspendableMonitor", t2);
}
}
if (selectorState <= 0) {
selector.selectedKeys().clear();
}
} catch (Throwable t2){
logger.log(Level.SEVERE, "SuspendableMonitor", t2);
}
}
}
}
/**
* Expire the SelectionKey?
*/
protected void expireIdleKeys() {
Set readyKeys = selector.keys();
if (readyKeys.isEmpty()) {
return;
}
long current = System.currentTimeMillis();
Iterator iterator = readyKeys.iterator();
SelectionKey key;
while (iterator.hasNext()) {
key = iterator.next();
KeyHandler kh = (KeyHandler) key.attachment();
if (kh == null) {
return;
}
long expire = kh.getRegistrationTime();
if (expire == -1){
continue;
}
if (current - expire >= kh.getSuspendableHandler().getExpireTime()) {
kh.setRegistrationTime(-1);
if (logger.isLoggable(Level.FINE)) {
logger.log(Level.FINE, "Expiring: "
+ key + " attachment: " + key.attachment());
}
try {
kh.getSuspendableHandler().getSuspendableHandler()
.expired(kh.getSuspendableHandler().getAttachment());
} catch (Throwable t) {
if (logger.isLoggable(Level.FINE) && kh != null) {
logger.log(Level.FINE, "Interrupting: " + t);
}
}
kh.getSuspendableHandler().getSuspendableFilter()
.resume(kh.getKey());
}
}
}
/**
* Interrupt a suspended SelectionKey that have timed out.
*/
protected void interrupted(SelectionKey key) {
key.cancel();
KeyHandler kh = (KeyHandler) key.attachment();
kh.getSuspendableHandler().getSelectorHandler()
.getSelectionKeyHandler().cancel(kh.getKey());
if (logger.isLoggable(Level.FINE) && kh != null) {
logger.log(Level.FINE, "Interrupting: " + kh.getKey());
}
if (kh != null) {
kh.getSuspendableHandler().getSuspendableHandler().
interupted(kh.getSuspendableHandler().getAttachment());
kh.getSuspendableHandler().getSuspendableFilter()
.suspendedKeys.remove(kh.getKey());
}
}
}.start();
}
/**
* Suspend the {@link ReadableChannel} represented by this {@link SuspendableFilter.KeyHandler}
* by registering it on secondary Selector.
* @param kh The KeyHandler which hold the current SelectionKey.
*/
protected void suspend(KeyHandler kh)
throws ClosedChannelException {
try{
kh.setRegistrationTime(System.currentTimeMillis());
if (kh.getForeignKey() == null){
keysToRegister.offer(kh);
selector.wakeup();
}
} catch (Throwable ex){
logger.log(Level.SEVERE,"suspend exception: " + kh.getKey(), ex);
}
}
}
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