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*
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* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
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package org.glassfish.grizzly.util;
import java.io.IOException;
import java.util.Iterator;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import org.glassfish.grizzly.Connection;
import org.glassfish.grizzly.Grizzly;
import org.glassfish.grizzly.TransportFactory;
import org.glassfish.grizzly.attributes.Attribute;
import org.glassfish.grizzly.filterchain.FilterAdapter;
import org.glassfish.grizzly.filterchain.FilterChainContext;
import org.glassfish.grizzly.filterchain.NextAction;
/**
*
* @author oleksiys
*/
public class IdleTimeoutFilter extends FilterAdapter {
public static final long UNLIMITED_TIMEOUT = -1;
public static final long UNSET_TIMEOUT = 0;
public static final String IDLE_ATTRIBUTE_NAME = "connection-idle-attribute";
public static Attribute idleAttribute =
Grizzly.DEFAULT_ATTRIBUTE_BUILDER.createAttribute(
IDLE_ATTRIBUTE_NAME, UNLIMITED_TIMEOUT);
private boolean isHandleAccepted;
private boolean isHandleConnected;
private volatile ScheduledFuture scheduledFuture;
private long timeoutMillis;
private ScheduledExecutorService scheduledThreadPool;
private LinkedTransferQueue connections;
private volatile TimeoutChecker checker;
public IdleTimeoutFilter(long timeout, TimeUnit timeunit) {
this(timeout, timeunit,
TransportFactory.getInstance().getDefaultScheduledThreadPool());
}
public IdleTimeoutFilter(long timeout, TimeUnit timeunit,
ScheduledExecutorService scheduledThreadPool) {
this.timeoutMillis = TimeUnit.MILLISECONDS.convert(timeout, timeunit);
this.scheduledThreadPool = scheduledThreadPool;
connections = new LinkedTransferQueue();
isHandleAccepted = true;
isHandleConnected = false;
}
public ScheduledExecutorService getScheduledThreadPool() {
return scheduledThreadPool;
}
public void setScheduledThreadPool(
ScheduledExecutorService scheduledThreadPool) {
this.scheduledThreadPool = scheduledThreadPool;
}
public long getTimeout(TimeUnit timeunit) {
return timeunit.convert(timeoutMillis, TimeUnit.MILLISECONDS);
}
public void setTimeout(long timeout, TimeUnit timeunit) {
timeoutMillis = TimeUnit.MILLISECONDS.convert(timeout, timeunit);
if (scheduledFuture == null) {
scheduledFuture.cancel(false);
registerChecker();
}
}
public boolean isHandleAccepted() {
return isHandleAccepted;
}
public void setHandleAccepted(boolean isHandleAccepted) {
this.isHandleAccepted = isHandleAccepted;
}
public boolean isHandleConnected() {
return isHandleConnected;
}
public void setHandleConnected(boolean isHandleConnected) {
this.isHandleConnected = isHandleConnected;
}
@Override
public NextAction handleRead(FilterChainContext ctx, NextAction nextAction) throws IOException {
clearTimeout(ctx.getConnection());
return nextAction;
}
@Override
public NextAction handleWrite(FilterChainContext ctx, NextAction nextAction) throws IOException {
clearTimeout(ctx.getConnection());
return nextAction;
}
@Override
public NextAction postRead(FilterChainContext ctx, NextAction nextAction) throws IOException {
resetTimeout(ctx.getConnection());
return nextAction;
}
@Override
public NextAction postWrite(FilterChainContext ctx, NextAction nextAction) throws IOException {
resetTimeout(ctx.getConnection());
return nextAction;
}
@Override
public NextAction postAccept(FilterChainContext ctx,
NextAction nextAction) throws IOException {
if (isHandleAccepted) {
Connection connection = ctx.getConnection();
resetTimeout(connection);
addConnection(connection);
}
return nextAction;
}
@Override
public NextAction postConnect(FilterChainContext ctx, NextAction nextAction)
throws IOException {
if (isHandleConnected()) {
Connection connection = ctx.getConnection();
resetTimeout(connection);
addConnection(connection);
}
return nextAction;
}
public synchronized void initialize() {
if (scheduledFuture != null) {
throw new IllegalStateException(
"IdleTimeoutFilter was already initialized!");
}
registerChecker();
}
public synchronized void release() {
checker = null;
scheduledFuture.cancel(false);
scheduledFuture = null;
connections.clear();
}
protected void registerChecker() {
if (timeoutMillis > 0) {
checker = new TimeoutChecker();
scheduledFuture = scheduledThreadPool.schedule(checker,
timeoutMillis, TimeUnit.MILLISECONDS);
}
}
protected void addConnection(Connection connection) {
connections.add(connection);
}
protected void clearTimeout(Connection connection) {
long currentTimeout = getConnectionTimeout(connection);
if (currentTimeout > 0) {
setConnectionTimeout(connection, UNSET_TIMEOUT);
}
}
protected void resetTimeout(Connection connection) {
long currentTimeout = getConnectionTimeout(connection);
if (currentTimeout >= 0) {
setExpirationTime(connection, timeoutMillis, TimeUnit.MILLISECONDS);
}
}
protected long getConnectionTimeout(Connection connection) {
return idleAttribute.get(connection);
}
protected void setConnectionTimeout(Connection connection, long timeout) {
idleAttribute.set(connection, timeout);
}
public Long getExpirationTime(Connection connection, TimeUnit timeunit) {
long expirationTime = getConnectionTimeout(connection);
if (expirationTime > 0 && timeunit != TimeUnit.MILLISECONDS) {
return timeunit.convert(expirationTime, TimeUnit.MILLISECONDS);
}
return expirationTime;
}
public void setExpirationTime(Connection connection, long timeout,
TimeUnit timeunit) {
if (timeout > 0 && timeunit != TimeUnit.MILLISECONDS) {
setConnectionTimeout(connection,
TimeUnit.MILLISECONDS.convert(timeout, timeunit));
} else {
setConnectionTimeout(connection, timeout);
}
}
public class TimeoutChecker implements Runnable {
public void run() {
long currentTimeMillis = System.currentTimeMillis();
long nextTimeout = timeoutMillis;
try {
for (Iterator it = connections.iterator(); it.hasNext();) {
Connection connection = it.next();
if (!connection.isOpen()) {
it.remove();
continue;
}
Long expirationTime = getExpirationTime(connection,
TimeUnit.MILLISECONDS);
if (expirationTime == 0) {
continue;
}
long diff = currentTimeMillis - expirationTime;
if (diff >= 0) {
try {
connection.close();
} catch (IOException e) {
Grizzly.logger.log(Level.FINE, "IdleTimeoutFilter:" +
"unexpected exception, when trying " +
"to close connection", e);
} finally {
it.remove();
}
} else {
diff = -diff;
if (nextTimeout > diff) {
nextTimeout = diff;
}
}
}
} catch (Exception e) {
Grizzly.logger.log(Level.WARNING,
"IdleTimeoutFilter: unexpected exception", e);
} finally {
if (this == checker) {
scheduledFuture = scheduledThreadPool.schedule(checker,
nextTimeout, TimeUnit.MILLISECONDS);
}
}
}
}
}
