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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tomcat.util.net;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.SocketTimeoutException;
import java.nio.ByteBuffer;
import java.nio.channels.CancelledKeyException;
import java.nio.channels.FileChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.nio.channels.WritableByteChannel;
import java.security.KeyStore;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executor;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import javax.net.ssl.KeyManager;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLSessionContext;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509KeyManager;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.IntrospectionUtils;
import org.apache.tomcat.util.net.SecureNioChannel.ApplicationBufferHandler;
import org.apache.tomcat.util.net.jsse.NioX509KeyManager;
import org.apache.tomcat.util.res.StringManager;
/**
* NIO tailored thread pool, providing the following services:
*
*
Socket acceptor thread
*
Socket poller thread
*
Worker threads pool
*
*
* When switching to Java 5, there's an opportunity to use the virtual
* machine's thread pool.
*
* @author Mladen Turk
* @author Remy Maucherat
* @author Filip Hanik
*/
public class NioEndpoint {
// -------------------------------------------------------------- Constants
protected static Log log = LogFactory.getLog(NioEndpoint.class);
protected static StringManager sm =
StringManager.getManager("org.apache.tomcat.util.net.res");
/**
* The Request attribute key for the cipher suite.
*/
public static final String CIPHER_SUITE_KEY = "javax.servlet.request.cipher_suite";
/**
* The Request attribute key for the key size.
*/
public static final String KEY_SIZE_KEY = "javax.servlet.request.key_size";
/**
* The Request attribute key for the client certificate chain.
*/
public static final String CERTIFICATE_KEY = "javax.servlet.request.X509Certificate";
/**
* The Request attribute key for the session id.
* This one is a Tomcat extension to the Servlet spec.
*/
public static final String SESSION_ID_KEY = "javax.servlet.request.ssl_session";
public static final int OP_REGISTER = 0x100; //register interest op
public static final int OP_CALLBACK = 0x200; //callback interest op
// ----------------------------------------------------------------- Fields
/**
* Available workers.
*/
protected WorkerStack workers = null;
/**
* Running state of the endpoint.
*/
protected volatile boolean running = false;
/**
* Will be set to true whenever the endpoint is paused.
*/
protected volatile boolean paused = false;
/**
* Track the initialization state of the endpoint.
*/
protected boolean initialized = false;
/**
* Current worker threads busy count.
*/
protected int curThreadsBusy = 0;
/**
* Current worker threads count.
*/
protected int curThreads = 0;
/**
* Sequence number used to generate thread names.
*/
protected int sequence = 0;
protected NioSelectorPool selectorPool = new NioSelectorPool();
/**
* Server socket "pointer".
*/
protected ServerSocketChannel serverSock = null;
/**
* use send file
*/
protected boolean useSendfile = true;
/**
* The size of the OOM parachute.
*/
protected int oomParachute = 1024*1024;
/**
* The oom parachute, when an OOM error happens,
* will release the data, giving the JVM instantly
* a chunk of data to be able to recover with.
*/
protected byte[] oomParachuteData = null;
/**
* Make sure this string has already been allocated
*/
protected static final String oomParachuteMsg =
"SEVERE:Memory usage is low, parachute is non existent, your system may start failing.";
/**
* Keep track of OOM warning messages.
*/
long lastParachuteCheck = System.currentTimeMillis();
/**
* Keep track of how many threads are in use
*/
protected AtomicInteger activeSocketProcessors = new AtomicInteger(0);
/**
*
*/
protected volatile CountDownLatch stopLatch = null;
/**
* Cache for SocketProcessor objects
*/
protected ConcurrentLinkedQueue processorCache = new ConcurrentLinkedQueue() {
protected AtomicInteger size = new AtomicInteger(0);
public boolean offer(SocketProcessor sc) {
sc.reset(null,null);
boolean offer = socketProperties.getProcessorCache()==-1?true:size.get() keyCache = new ConcurrentLinkedQueue() {
protected AtomicInteger size = new AtomicInteger(0);
public boolean offer(KeyAttachment ka) {
ka.reset();
boolean offer = socketProperties.getKeyCache()==-1?true:size.get() eventCache = new ConcurrentLinkedQueue() {
protected AtomicInteger size = new AtomicInteger(0);
public boolean offer(PollerEvent pe) {
pe.reset();
boolean offer = socketProperties.getEventCache()==-1?true:size.get() nioChannels = new ConcurrentLinkedQueue() {
protected AtomicInteger size = new AtomicInteger(0);
protected AtomicInteger bytes = new AtomicInteger(0);
public boolean offer(NioChannel socket) {
boolean offer = socketProperties.getBufferPool()==-1?true:size.get() 0) this.backlog = backlog; }
public int getBacklog() { return backlog; }
protected SocketProperties socketProperties = new SocketProperties();
/**
* Socket TCP no delay.
*/
public boolean getTcpNoDelay() { return socketProperties.getTcpNoDelay();}
public void setTcpNoDelay(boolean tcpNoDelay) { socketProperties.setTcpNoDelay(tcpNoDelay); }
/**
* Socket linger.
*/
public int getSoLinger() { return socketProperties.getSoLingerTime(); }
public void setSoLinger(int soLinger) {
socketProperties.setSoLingerTime(soLinger);
socketProperties.setSoLingerOn(soLinger>=0);
}
/**
* Socket timeout.
*/
public int getSoTimeout() { return socketProperties.getSoTimeout(); }
public void setSoTimeout(int soTimeout) { socketProperties.setSoTimeout(soTimeout); }
/**
* The default is true - the created threads will be
* in daemon mode. If set to false, the control thread
* will not be daemon - and will keep the process alive.
*/
protected boolean daemon = true;
public void setDaemon(boolean b) { daemon = b; }
public boolean getDaemon() { return daemon; }
/**
* Name of the thread pool, which will be used for naming child threads.
*/
protected String name = "TP";
public void setName(String name) { this.name = name; }
public String getName() { return name; }
/**
* Allow comet request handling.
*/
protected boolean useComet = true;
public void setUseComet(boolean useComet) { this.useComet = useComet; }
public boolean getUseComet() { return useComet; }
/**
* Acceptor thread count.
*/
protected int acceptorThreadCount = 1;
public void setAcceptorThreadCount(int acceptorThreadCount) { this.acceptorThreadCount = acceptorThreadCount; }
public int getAcceptorThreadCount() { return acceptorThreadCount; }
/**
* Poller thread count.
*/
protected int pollerThreadCount = Runtime.getRuntime().availableProcessors();
public void setPollerThreadCount(int pollerThreadCount) { this.pollerThreadCount = pollerThreadCount; }
public int getPollerThreadCount() { return pollerThreadCount; }
protected long selectorTimeout = 1000;
public void setSelectorTimeout(long timeout){ this.selectorTimeout = timeout;}
public long getSelectorTimeout(){ return this.selectorTimeout; }
/**
* The socket poller.
*/
protected Poller[] pollers = null;
protected AtomicInteger pollerRotater = new AtomicInteger(0);
/**
* Return an available poller in true round robin fashion
* @return
*/
public Poller getPoller0() {
int idx = Math.abs(pollerRotater.incrementAndGet()) % pollers.length;
return pollers[idx];
}
/**
* Dummy maxSpareThreads property.
*/
public int getMaxSpareThreads() { return Math.min(getMaxThreads(),5); }
/**
* Dummy minSpareThreads property.
*/
public int getMinSpareThreads() { return Math.min(getMaxThreads(),5); }
/**
* Generic properties, introspected
*/
public boolean setProperty(String name, String value) {
final String selectorPoolName = "selectorPool.";
final String socketName = "socket.";
try {
if (name.startsWith(selectorPoolName)) {
return IntrospectionUtils.setProperty(selectorPool, name.substring(selectorPoolName.length()), value);
} else if (name.startsWith(socketName)) {
return IntrospectionUtils.setProperty(socketProperties, name.substring(socketName.length()), value);
} else {
return IntrospectionUtils.setProperty(this,name,value,false);
}
}catch ( Exception x ) {
log.error("Unable to set attribute \""+name+"\" to \""+value+"\"",x);
return false;
}
}
public String adjustRelativePath(String path, String relativeTo) {
File f = new File(path);
if ( !f.isAbsolute()) {
path = relativeTo + File.separator + path;
f = new File(path);
}
if (!f.exists()) {
log.warn("configured file:["+path+"] does not exist.");
}
return path;
}
public String defaultIfNull(String val, String defaultValue) {
if (val==null) return defaultValue;
else return val;
}
// -------------------- SSL related properties --------------------
protected String truststoreFile = System.getProperty("javax.net.ssl.trustStore");
public void setTruststoreFile(String s) {
s = adjustRelativePath(s,System.getProperty("catalina.base"));
this.truststoreFile = s;
}
public String getTruststoreFile() {return truststoreFile;}
protected String truststorePass = System.getProperty("javax.net.ssl.trustStorePassword");
public void setTruststorePass(String truststorePass) {this.truststorePass = truststorePass;}
public String getTruststorePass() {return truststorePass;}
protected String truststoreType = System.getProperty("javax.net.ssl.trustStoreType");
public void setTruststoreType(String truststoreType) {this.truststoreType = truststoreType;}
public String getTruststoreType() {return truststoreType;}
protected String keystoreFile = System.getProperty("user.home")+"/.keystore";
public String getKeystoreFile() { return keystoreFile;}
public void setKeystoreFile(String s ) {
s = adjustRelativePath(s,System.getProperty("catalina.base"));
this.keystoreFile = s;
}
public void setKeystore(String s ) { setKeystoreFile(s);}
public String getKeystore() { return getKeystoreFile();}
String keyAlias = null;
public String getKeyAlias() { return keyAlias;}
public void setKeyAlias(String s ) { keyAlias = s;}
protected String algorithm = "SunX509";
public String getAlgorithm() { return algorithm;}
public void setAlgorithm(String s ) { this.algorithm = s;}
protected String clientAuth = "false";
public String getClientAuth() { return clientAuth;}
public void setClientAuth(String s ) { this.clientAuth = s;}
protected String keystorePass = "changeit";
public String getKeystorePass() { return keystorePass;}
public void setKeystorePass(String s ) { this.keystorePass = s;}
protected String keystoreType = "JKS";
public String getKeystoreType() { return keystoreType;}
public void setKeystoreType(String s ) { this.keystoreType = s;}
protected String sslProtocol = "TLS";
public String getSslProtocol() { return sslProtocol;}
public void setSslProtocol(String s) { sslProtocol = s;}
protected String sslEnabledProtocols=null; //"TLSv1,SSLv3,SSLv2Hello"
protected String[] sslEnabledProtocolsarr = new String[0];
public void setSslEnabledProtocols(String s) {
this.sslEnabledProtocols = s;
StringTokenizer t = new StringTokenizer(s,",");
sslEnabledProtocolsarr = new String[t.countTokens()];
for (int i=0; i10000) {
try {
log.fatal(oomParachuteMsg);
}catch (Throwable t) {
System.err.println(oomParachuteMsg);
}
lastParachuteCheck = System.currentTimeMillis();
}
}
protected boolean reclaimParachute(boolean force) {
if ( oomParachuteData != null ) return true;
if ( oomParachute > 0 && ( force || (Runtime.getRuntime().freeMemory() > (oomParachute*2))) )
oomParachuteData = new byte[oomParachute];
return oomParachuteData != null;
}
protected void releaseCaches() {
this.keyCache.clear();
this.nioChannels.clear();
this.processorCache.clear();
if ( handler != null ) handler.releaseCaches();
}
// --------------------------------------------------------- Public Methods
/**
* Number of keepalive sockets.
*/
public int getKeepAliveCount() {
if (pollers == null) {
return 0;
} else {
int sum = 0;
for (int i=0; i0) reclaimParachute(true);
selectorPool.open();
initialized = true;
}
public KeyManager[] wrap(KeyManager[] managers) {
if (managers==null) return null;
KeyManager[] result = new KeyManager[managers.length];
for (int i=0; i 0 ) engine.setEnabledCipherSuites(ciphersarr);
if ( sslEnabledProtocolsarr.length > 0 ) engine.setEnabledProtocols(sslEnabledProtocolsarr);
return engine;
}
/**
* Returns true if a worker thread is available for processing.
* @return boolean
*/
protected boolean isWorkerAvailable() {
if ( executor != null ) {
return true;
} else {
if (workers.size() > 0) {
return true;
}
if ( (maxThreads > 0) && (curThreads < maxThreads)) {
return true;
} else {
if (maxThreads < 0) {
return true;
} else {
return false;
}
}
}
}
/**
* Create (or allocate) and return an available processor for use in
* processing a specific HTTP request, if possible. If the maximum
* allowed processors have already been created and are in use, return
* null instead.
*/
protected Worker createWorkerThread() {
synchronized (workers) {
if (workers.size() > 0) {
curThreadsBusy++;
return (workers.pop());
}
if ((maxThreads > 0) && (curThreads < maxThreads)) {
curThreadsBusy++;
if (curThreadsBusy == maxThreads) {
log.info(sm.getString("endpoint.info.maxThreads",
Integer.toString(maxThreads), address,
Integer.toString(port)));
}
return (newWorkerThread());
} else {
if (maxThreads < 0) {
curThreadsBusy++;
return (newWorkerThread());
} else {
return (null);
}
}
}
}
/**
* Create and return a new processor suitable for processing HTTP
* requests and returning the corresponding responses.
*/
protected Worker newWorkerThread() {
Worker workerThread = new Worker();
workerThread.start();
return (workerThread);
}
/**
* Return a new worker thread, and block while to worker is available.
*/
protected Worker getWorkerThread() {
// Allocate a new worker thread
Worker workerThread = createWorkerThread();
while (workerThread == null) {
try {
synchronized (workers) {
workerThread = createWorkerThread();
if ( workerThread == null ) workers.wait();
}
} catch (InterruptedException e) {
// Ignore
}
if ( workerThread == null ) workerThread = createWorkerThread();
}
return workerThread;
}
/**
* Recycle the specified Processor so that it can be used again.
*
* @param workerThread The processor to be recycled
*/
protected void recycleWorkerThread(Worker workerThread) {
synchronized (workers) {
workers.push(workerThread);
curThreadsBusy--;
workers.notify();
}
}
/**
* Process given socket.
*/
protected boolean processSocket(NioChannel socket) {
return processSocket(socket,null);
}
/**
* Process given socket for an event.
*/
protected boolean processSocket(NioChannel socket, SocketStatus status) {
return processSocket(socket,status,true);
}
protected boolean processSocket(NioChannel socket, SocketStatus status, boolean dispatch) {
try {
KeyAttachment attachment = (KeyAttachment)socket.getAttachment(false);
attachment.setCometNotify(false); //will get reset upon next reg
if (executor == null) {
getWorkerThread().assign(socket, status);
} else {
SocketProcessor sc = processorCache.poll();
if ( sc == null ) sc = new SocketProcessor(socket,status);
else sc.reset(socket,status);
if ( dispatch ) executor.execute(sc);
else sc.run();
}
} catch (Throwable t) {
// This means we got an OOM or similar creating a thread, or that
// the pool and its queue are full
log.error(sm.getString("endpoint.process.fail"), t);
return false;
}
return true;
}
// --------------------------------------------------- Acceptor Inner Class
/**
* Server socket acceptor thread.
*/
protected class Acceptor implements Runnable {
/**
* The background thread that listens for incoming TCP/IP connections and
* hands them off to an appropriate processor.
*/
public void run() {
// Loop until we receive a shutdown command
while (running) {
// Loop if endpoint is paused
while (paused) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// Ignore
}
}
try {
// Accept the next incoming connection from the server socket
SocketChannel socket = serverSock.accept();
// Hand this socket off to an appropriate processor
//TODO FIXME - this is currently a blocking call, meaning we will be blocking
//further accepts until there is a thread available.
if ( running && (!paused) && socket != null ) {
//processSocket(socket);
if (!setSocketOptions(socket)) {
try {
socket.socket().close();
socket.close();
} catch (IOException ix) {
if (log.isDebugEnabled())
log.debug("", ix);
}
}
}
}catch (SocketTimeoutException sx) {
//normal condition
}catch ( IOException x ) {
if ( running ) log.error(sm.getString("endpoint.accept.fail"), x);
} catch (OutOfMemoryError oom) {
try {
oomParachuteData = null;
releaseCaches();
log.error("", oom);
}catch ( Throwable oomt ) {
try {
try {
System.err.println(oomParachuteMsg);
oomt.printStackTrace();
}catch (Throwable letsHopeWeDontGetHere){}
}catch (Throwable letsHopeWeDontGetHere){}
}
} catch (Throwable t) {
log.error(sm.getString("endpoint.accept.fail"), t);
}
}//while
}//run
}
// ----------------------------------------------------- Poller Inner Classes
/**
*
* PollerEvent, cacheable object for poller events to avoid GC
*/
public class PollerEvent implements Runnable {
protected NioChannel socket;
protected int interestOps;
protected KeyAttachment key;
public PollerEvent(NioChannel ch, KeyAttachment k, int intOps) {
reset(ch, k, intOps);
}
public void reset(NioChannel ch, KeyAttachment k, int intOps) {
socket = ch;
interestOps = intOps;
key = k;
}
public void reset() {
reset(null, null, 0);
}
public void run() {
if ( interestOps == OP_REGISTER ) {
try {
socket.getIOChannel().register(socket.getPoller().getSelector(), SelectionKey.OP_READ, key);
} catch (Exception x) {
log.error("", x);
}
} else {
final SelectionKey key = socket.getIOChannel().keyFor(socket.getPoller().getSelector());
try {
boolean cancel = false;
if (key != null) {
final KeyAttachment att = (KeyAttachment) key.attachment();
if ( att!=null ) {
//handle callback flag
if (att.getComet() && (interestOps & OP_CALLBACK) == OP_CALLBACK ) {
att.setCometNotify(true);
} else {
att.setCometNotify(false);
}
interestOps = (interestOps & (~OP_CALLBACK));//remove the callback flag
att.access();//to prevent timeout
//we are registering the key to start with, reset the fairness counter.
int ops = key.interestOps() | interestOps;
att.interestOps(ops);
key.interestOps(ops);
att.setCometOps(ops);
} else {
cancel = true;
}
} else {
cancel = true;
}
if ( cancel ) socket.getPoller().cancelledKey(key,SocketStatus.ERROR,false);
}catch (CancelledKeyException ckx) {
try {
socket.getPoller().cancelledKey(key,SocketStatus.DISCONNECT,true);
}catch (Exception ignore) {}
}
}//end if
}//run
public String toString() {
return super.toString()+"[intOps="+this.interestOps+"]";
}
}
/**
* Poller class.
*/
public class Poller implements Runnable {
protected Selector selector;
protected ConcurrentLinkedQueue events = new ConcurrentLinkedQueue();
protected volatile boolean close = false;
protected long nextExpiration = 0;//optimize expiration handling
protected AtomicLong wakeupCounter = new AtomicLong(0l);
protected CountDownLatch stopLatch = new CountDownLatch(1);
public Poller() throws IOException {
this.selector = Selector.open();
}
public Selector getSelector() { return selector;}
/**
* Destroy the poller.
*/
protected void destroy() {
// Wait for polltime before doing anything, so that the poller threads
// exit, otherwise parallel closure of sockets which are still
// in the poller can cause problems
close = true;
events.clear();
selector.wakeup();
}
public void addEvent(Runnable event) {
events.offer(event);
if ( wakeupCounter.incrementAndGet() == 0 ) selector.wakeup();
}
public void cometInterest(NioChannel socket) {
KeyAttachment att = (KeyAttachment)socket.getAttachment(false);
add(socket,att.getCometOps());
if ( (att.getCometOps()&OP_CALLBACK) == OP_CALLBACK ) {
nextExpiration = 0; //force the check for faster callback
selector.wakeup();
}
}
public void wakeup() {
selector.wakeup();
}
/**
* Add specified socket and associated pool to the poller. The socket will
* be added to a temporary array, and polled first after a maximum amount
* of time equal to pollTime (in most cases, latency will be much lower,
* however).
*
* @param socket to add to the poller
*/
public void add(final NioChannel socket) {
add(socket,SelectionKey.OP_READ);
}
public void add(final NioChannel socket, final int interestOps) {
PollerEvent r = eventCache.poll();
if ( r==null) r = new PollerEvent(socket,null,interestOps);
else r.reset(socket,null,interestOps);
addEvent(r);
}
public boolean events() {
boolean result = false;
//synchronized (events) {
Runnable r = null;
result = (events.size() > 0);
while ( (r = (Runnable)events.poll()) != null ) {
try {
r.run();
if ( r instanceof PollerEvent ) {
((PollerEvent)r).reset();
eventCache.offer((PollerEvent)r);
}
} catch ( Throwable x ) {
log.error("",x);
}
}
//events.clear();
//}
return result;
}
public void register(final NioChannel socket)
{
socket.setPoller(this);
KeyAttachment key = keyCache.poll();
final KeyAttachment ka = key!=null?key:new KeyAttachment();
ka.reset(this,socket,getSocketProperties().getSoTimeout());
PollerEvent r = eventCache.poll();
ka.interestOps(SelectionKey.OP_READ);//this is what OP_REGISTER turns into.
if ( r==null) r = new PollerEvent(socket,ka,OP_REGISTER);
else r.reset(socket,ka,OP_REGISTER);
addEvent(r);
}
public void cancelledKey(SelectionKey key, SocketStatus status, boolean dispatch) {
try {
if ( key == null ) return;//nothing to do
KeyAttachment ka = (KeyAttachment) key.attachment();
if (ka != null && ka.getComet() && status != null) {
//the comet event takes care of clean up
//processSocket(ka.getChannel(), status, dispatch);
ka.setComet(false);//to avoid a loop
if (status == SocketStatus.TIMEOUT ) {
processSocket(ka.getChannel(), status, true);
return; // don't close on comet timeout
} else {
processSocket(ka.getChannel(), status, false); //don't dispatch if the lines below are cancelling the key
}
}
key.attach(null);
if (ka!=null) handler.release(ka.getChannel());
if (key.isValid()) key.cancel();
if (key.channel().isOpen()) try {key.channel().close();}catch (Exception ignore){}
try {if (ka!=null) ka.channel.close(true);}catch (Exception ignore){}
try {if (ka!=null && ka.getSendfileData()!=null && ka.getSendfileData().fchannel!=null && ka.getSendfileData().fchannel.isOpen()) ka.getSendfileData().fchannel.close();}catch (Exception ignore){}
if (ka!=null) ka.reset();
} catch (Throwable e) {
if ( log.isDebugEnabled() ) log.error("",e);
// Ignore
}
}
/**
* The background thread that listens for incoming TCP/IP connections and
* hands them off to an appropriate processor.
*/
public void run() {
// Loop until we receive a shutdown command
while (running) {
try {
// Loop if endpoint is paused
while (paused && (!close) ) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// Ignore
}
}
boolean hasEvents = false;
hasEvents = (hasEvents | events());
// Time to terminate?
if (close) {
timeout(0, false);
break;
}
int keyCount = 0;
try {
if ( !close ) {
if (wakeupCounter.get()>0) {
//if we are here, means we have other stuff to do
//do a non blocking select
keyCount = selector.selectNow();
}else {
wakeupCounter.set( -1);
keyCount = selector.select(selectorTimeout);
}
wakeupCounter.set(0);
}
if (close) {
timeout(0, false);
selector.close();
break;
}
} catch ( NullPointerException x ) {
//sun bug 5076772 on windows JDK 1.5
if ( log.isDebugEnabled() ) log.debug("Possibly encountered sun bug 5076772 on windows JDK 1.5",x);
if ( wakeupCounter == null || selector == null ) throw x;
continue;
} catch ( CancelledKeyException x ) {
//sun bug 5076772 on windows JDK 1.5
if ( log.isDebugEnabled() ) log.debug("Possibly encountered sun bug 5076772 on windows JDK 1.5",x);
if ( wakeupCounter == null || selector == null ) throw x;
continue;
} catch (Throwable x) {
log.error("",x);
continue;
}
//either we timed out or we woke up, process events first
if ( keyCount == 0 ) hasEvents = (hasEvents | events());
Iterator iterator = keyCount > 0 ? selector.selectedKeys().iterator() : null;
// Walk through the collection of ready keys and dispatch
// any active event.
while (iterator != null && iterator.hasNext()) {
SelectionKey sk = (SelectionKey) iterator.next();
KeyAttachment attachment = (KeyAttachment)sk.attachment();
attachment.access();
iterator.remove();
processKey(sk, attachment);
}//while
//process timeouts
timeout(keyCount,hasEvents);
if ( oomParachute > 0 && oomParachuteData == null ) checkParachute();
} catch (OutOfMemoryError oom) {
try {
oomParachuteData = null;
releaseCaches();
log.error("", oom);
}catch ( Throwable oomt ) {
try {
System.err.println(oomParachuteMsg);
oomt.printStackTrace();
}catch (Throwable letsHopeWeDontGetHere){}
}
}
}//while
synchronized (this) {
this.notifyAll();
}
stopLatch.countDown();
}
protected boolean processKey(SelectionKey sk, KeyAttachment attachment) {
boolean result = true;
try {
if ( close ) {
cancelledKey(sk, SocketStatus.STOP, false);
} else if ( sk.isValid() && attachment != null ) {
attachment.access();//make sure we don't time out valid sockets
sk.attach(attachment);//cant remember why this is here
NioChannel channel = attachment.getChannel();
if (sk.isReadable() || sk.isWritable() ) {
if ( attachment.getSendfileData() != null ) {
processSendfile(sk,attachment,true, false);
} else if ( attachment.getComet() ) {
//check if thread is available
if ( isWorkerAvailable() ) {
//set interest ops to 0 so we don't get multiple
//invokations for both read and write on separate threads
reg(sk, attachment, 0);
//read goes before write
if (sk.isReadable()) {
//read notification
if (!processSocket(channel, SocketStatus.OPEN))
processSocket(channel, SocketStatus.DISCONNECT);
} else {
//future placement of a WRITE notif
if (!processSocket(channel, SocketStatus.OPEN))
processSocket(channel, SocketStatus.DISCONNECT);
}
} else {
result = false;
}
} else {
//later on, improve latch behavior
if ( isWorkerAvailable() ) {
unreg(sk, attachment,sk.readyOps());
boolean close = (!processSocket(channel));
if (close) {
cancelledKey(sk,SocketStatus.DISCONNECT,false);
}
} else {
result = false;
}
}
}
} else {
//invalid key
cancelledKey(sk, SocketStatus.ERROR,false);
}
} catch ( CancelledKeyException ckx ) {
cancelledKey(sk, SocketStatus.ERROR,false);
} catch (Throwable t) {
log.error("",t);
}
return result;
}
public boolean processSendfile(SelectionKey sk, KeyAttachment attachment, boolean reg, boolean event) {
NioChannel sc = null;
try {
//unreg(sk,attachment);//only do this if we do process send file on a separate thread
SendfileData sd = attachment.getSendfileData();
if ( sd.fchannel == null ) {
File f = new File(sd.fileName);
if ( !f.exists() ) {
cancelledKey(sk,SocketStatus.ERROR,false);
return false;
}
sd.fchannel = new FileInputStream(f).getChannel();
}
sc = attachment.getChannel();
sc.setSendFile(true);
WritableByteChannel wc =(WritableByteChannel) ((sc instanceof SecureNioChannel)?sc:sc.getIOChannel());
if (sc.getOutboundRemaining()>0) {
if (sc.flushOutbound()) {
attachment.access();
}
} else {
long written = sd.fchannel.transferTo(sd.pos,sd.length,wc);
if ( written > 0 ) {
sd.pos += written;
sd.length -= written;
attachment.access();
}
}
if ( sd.length <= 0 && sc.getOutboundRemaining()<=0) {
if (log.isDebugEnabled()) {
log.debug("Send file complete for:"+sd.fileName);
}
attachment.setSendfileData(null);
try {sd.fchannel.close();}catch(Exception ignore){}
if ( sd.keepAlive ) {
if (reg) {
if (log.isDebugEnabled()) {
log.debug("Connection is keep alive, registering back for OP_READ");
}
if (event) {
this.add(attachment.getChannel(),SelectionKey.OP_READ);
} else {
reg(sk,attachment,SelectionKey.OP_READ);
}
}
} else {
if (log.isDebugEnabled()) {
log.debug("Send file connection is being closed");
}
cancelledKey(sk,SocketStatus.STOP,false);
}
} else if ( attachment.interestOps() == 0 && reg ) {
if (log.isDebugEnabled()) {
log.debug("OP_WRITE for sendilfe:"+sd.fileName);
}
if (event) {
add(attachment.getChannel(),SelectionKey.OP_WRITE);
} else {
reg(sk,attachment,SelectionKey.OP_WRITE);
}
}
}catch ( IOException x ) {
if ( log.isDebugEnabled() ) log.debug("Unable to complete sendfile request:", x);
cancelledKey(sk,SocketStatus.ERROR,false);
return false;
}catch ( Throwable t ) {
log.error("",t);
cancelledKey(sk, SocketStatus.ERROR, false);
return false;
}finally {
if (sc!=null) sc.setSendFile(false);
}
return true;
}
protected void unreg(SelectionKey sk, KeyAttachment attachment, int readyOps) {
//this is a must, so that we don't have multiple threads messing with the socket
reg(sk,attachment,sk.interestOps()& (~readyOps));
}
protected void reg(SelectionKey sk, KeyAttachment attachment, int intops) {
sk.interestOps(intops);
attachment.interestOps(intops);
//attachment.setCometOps(intops);
}
protected void timeout(int keyCount, boolean hasEvents) {
long now = System.currentTimeMillis();
//don't process timeouts too frequently, but if the selector simply timed out
//then we can check timeouts to avoid gaps
if ( ((keyCount>0 || hasEvents) ||(now < nextExpiration)) && (!close) ) {
return;
}
long prevExp = nextExpiration; //for logging purposes only
nextExpiration = now + socketProperties.getTimeoutInterval();
//timeout
Set keys = selector.keys();
int keycount = 0;
for (Iterator iter = keys.iterator(); iter.hasNext(); ) {
SelectionKey key = iter.next();
keycount++;
try {
KeyAttachment ka = (KeyAttachment) key.attachment();
if ( ka == null ) {
cancelledKey(key, SocketStatus.ERROR,false); //we don't support any keys without attachments
} else if ( ka.getError() ) {
cancelledKey(key, SocketStatus.ERROR,true);//TODO this is not yet being used
} else if (ka.getComet() && ka.getCometNotify() ) {
ka.setCometNotify(false);
reg(key,ka,0);//avoid multiple calls, this gets reregistered after invokation
//if (!processSocket(ka.getChannel(), SocketStatus.OPEN_CALLBACK)) processSocket(ka.getChannel(), SocketStatus.DISCONNECT);
if (!processSocket(ka.getChannel(), SocketStatus.OPEN)) processSocket(ka.getChannel(), SocketStatus.DISCONNECT);
}else if ((ka.interestOps()&SelectionKey.OP_READ) == SelectionKey.OP_READ ||
(ka.interestOps()&SelectionKey.OP_WRITE) == SelectionKey.OP_WRITE) {
//only timeout sockets that we are waiting for a read from - or write (send file)
long delta = now - ka.getLastAccess();
long timeout = (ka.getTimeout()==-1)?((long) socketProperties.getSoTimeout()):(ka.getTimeout());
boolean isTimedout = delta > timeout;
if ( close ) {
key.interestOps(0);
ka.interestOps(0); //avoid duplicate stop calls
processKey(key,ka);
} else if (isTimedout) {
key.interestOps(0);
ka.interestOps(0); //avoid duplicate timeout calls
cancelledKey(key, SocketStatus.TIMEOUT,true);
} else {
long nextTime = now+(timeout-delta);
nextExpiration = (nextTime < nextExpiration)?nextTime:nextExpiration;
}
}//end if
}catch ( CancelledKeyException ckx ) {
cancelledKey(key, SocketStatus.ERROR,false);
}
}//for
if ( log.isDebugEnabled() ) log.debug("timeout completed: keys processed="+keycount+"; now="+now+"; nextExpiration="+prevExp+"; "+
"keyCount="+keyCount+"; hasEvents="+hasEvents +"; eval="+( (now < prevExp) && (keyCount>0 || hasEvents) && (!close) ));
}
}
// ----------------------------------------------------- Key Attachment Class
public static class KeyAttachment {
public KeyAttachment() {
}
public void reset(Poller poller, NioChannel channel, long soTimeout) {
this.channel = channel;
this.poller = poller;
lastAccess = System.currentTimeMillis();
currentAccess = false;
comet = false;
timeout = soTimeout;
error = false;
lastRegistered = 0;
sendfileData = null;
if ( readLatch!=null ) try {for (int i=0; i<(int)readLatch.getCount();i++) readLatch.countDown();}catch (Exception ignore){}
readLatch = null;
if ( writeLatch!=null ) try {for (int i=0; i<(int)writeLatch.getCount();i++) writeLatch.countDown();}catch (Exception ignore){}
writeLatch = null;
cometNotify = false;
cometOps = SelectionKey.OP_READ;
sendfileData = null;
}
public void reset() {
reset(null,null,-1);
}
public Poller getPoller() { return poller;}
public void setPoller(Poller poller){this.poller = poller;}
public long getLastAccess() { return lastAccess; }
public void access() { access(System.currentTimeMillis()); }
public void access(long access) { lastAccess = access; }
public void setComet(boolean comet) { this.comet = comet; }
public boolean getComet() { return comet; }
public void setCometNotify(boolean notify) { this.cometNotify = notify; }
public boolean getCometNotify() { return cometNotify; }
public void setCometOps(int ops) { this.cometOps = ops; }
public int getCometOps() { return cometOps; }
public boolean getCurrentAccess() { return currentAccess; }
public void setCurrentAccess(boolean access) { currentAccess = access; }
public void setTimeout(long timeout) {this.timeout = timeout;}
public long getTimeout() {return this.timeout;}
public boolean getError() { return error; }
public void setError(boolean error) { this.error = error; }
public NioChannel getChannel() { return channel;}
public void setChannel(NioChannel channel) { this.channel = channel;}
protected Poller poller = null;
protected int interestOps = 0;
public int interestOps() { return interestOps;}
public int interestOps(int ops) { this.interestOps = ops; return ops; }
public CountDownLatch getReadLatch() { return readLatch; }
public CountDownLatch getWriteLatch() { return writeLatch; }
protected CountDownLatch resetLatch(CountDownLatch latch) {
if ( latch==null || latch.getCount() == 0 ) return null;
else throw new IllegalStateException("Latch must be at count 0");
}
public void resetReadLatch() { readLatch = resetLatch(readLatch); }
public void resetWriteLatch() { writeLatch = resetLatch(writeLatch); }
protected CountDownLatch startLatch(CountDownLatch latch, int cnt) {
if ( latch == null || latch.getCount() == 0 ) {
return new CountDownLatch(cnt);
}
else throw new IllegalStateException("Latch must be at count 0 or null.");
}
public void startReadLatch(int cnt) { readLatch = startLatch(readLatch,cnt);}
public void startWriteLatch(int cnt) { writeLatch = startLatch(writeLatch,cnt);}
protected void awaitLatch(CountDownLatch latch, long timeout, TimeUnit unit) throws InterruptedException {
if ( latch == null ) throw new IllegalStateException("Latch cannot be null");
latch.await(timeout,unit);
}
public void awaitReadLatch(long timeout, TimeUnit unit) throws InterruptedException { awaitLatch(readLatch,timeout,unit);}
public void awaitWriteLatch(long timeout, TimeUnit unit) throws InterruptedException { awaitLatch(writeLatch,timeout,unit);}
public long getLastRegistered() { return lastRegistered; };
public void setLastRegistered(long reg) { lastRegistered = reg; }
public void setSendfileData(SendfileData sf) { this.sendfileData = sf;}
public SendfileData getSendfileData() { return this.sendfileData;}
protected long lastAccess = -1;
protected boolean currentAccess = false;
protected boolean comet = false;
protected int cometOps = SelectionKey.OP_READ;
protected boolean cometNotify = false;
protected long timeout = -1;
protected boolean error = false;
protected NioChannel channel = null;
protected CountDownLatch readLatch = null;
protected CountDownLatch writeLatch = null;
protected long lastRegistered = 0;
protected SendfileData sendfileData = null;
}
// ----------------------------------------------------- Worker Inner Class
/**
* Server processor class.
*/
protected class Worker implements Runnable {
protected Thread thread = null;
protected boolean available = false;
protected Object socket = null;
protected SocketStatus status = null;
/**
* Process an incoming TCP/IP connection on the specified socket. Any
* exception that occurs during processing must be logged and swallowed.
* NOTE: This method is called from our Connector's thread. We
* must assign it to our own thread so that multiple simultaneous
* requests can be handled.
*
* @param socket TCP socket to process
*/
protected synchronized void assign(Object socket) {
// Wait for the Processor to get the previous Socket
while (available) {
try {
wait();
} catch (InterruptedException e) {
}
}
// Store the newly available Socket and notify our thread
this.socket = socket;
status = null;
available = true;
notifyAll();
}
protected synchronized void assign(Object socket, SocketStatus status) {
// Wait for the Processor to get the previous Socket
while (available) {
try {
wait();
} catch (InterruptedException e) {
}
}
// Store the newly available Socket and notify our thread
this.socket = socket;
this.status = status;
available = true;
notifyAll();
}
/**
* Await a newly assigned Socket from our Connector, or null
* if we are supposed to shut down.
*/
protected synchronized Object await() {
// Wait for the Connector to provide a new Socket
while (!available) {
try {
wait();
} catch (InterruptedException e) {
}
}
// Notify the Connector that we have received this Socket
Object socket = this.socket;
available = false;
notifyAll();
return (socket);
}
/**
* The background thread that listens for incoming TCP/IP connections and
* hands them off to an appropriate processor.
*/
public void run() {
// Process requests until we receive a shutdown signal
while (running) {
NioChannel socket = null;
SelectionKey key = null;
try {
// Wait for the next socket to be assigned
Object channel = await();
if (channel == null)
continue;
if ( channel instanceof SocketChannel) {
SocketChannel sc = (SocketChannel)channel;
if ( !setSocketOptions(sc) ) {
try {
sc.socket().close();
sc.close();
}catch ( IOException ix ) {
if ( log.isDebugEnabled() ) log.debug("",ix);
}
} else {
//now we have it registered, remove it from the cache
}
} else {
socket = (NioChannel)channel;
SocketProcessor sc = processorCache.poll();
if ( sc == null ) sc = new SocketProcessor(socket,status);
else sc.reset(socket,status);
sc.run();
}
}catch(CancelledKeyException cx) {
if (socket!=null && key!=null) socket.getPoller().cancelledKey(key,null,false);
} catch (OutOfMemoryError oom) {
try {
oomParachuteData = null;
releaseCaches();
log.error("", oom);
}catch ( Throwable oomt ) {
try {
System.err.println(oomParachuteMsg);
oomt.printStackTrace();
}catch (Throwable letsHopeWeDontGetHere){}
}
} finally {
//dereference socket to let GC do its job
socket = null;
// Finish up this request
recycleWorkerThread(this);
}
}
}
/**
* Start the background processing thread.
*/
public void start() {
thread = new Thread(this);
thread.setName(getName() + "-" + (++curThreads));
thread.setDaemon(true);
thread.setPriority(getThreadPriority());
thread.start();
}
}
// ------------------------------------------------ Application Buffer Handler
public class NioBufferHandler implements ApplicationBufferHandler {
protected ByteBuffer readbuf = null;
protected ByteBuffer writebuf = null;
public NioBufferHandler(int readsize, int writesize, boolean direct) {
if ( direct ) {
readbuf = ByteBuffer.allocateDirect(readsize);
writebuf = ByteBuffer.allocateDirect(writesize);
}else {
readbuf = ByteBuffer.allocate(readsize);
writebuf = ByteBuffer.allocate(writesize);
}
}
public ByteBuffer expand(ByteBuffer buffer, int remaining) {return buffer;}
public ByteBuffer getReadBuffer() {return readbuf;}
public ByteBuffer getWriteBuffer() {return writebuf;}
}
// ------------------------------------------------ Handler Inner Interface
/**
* Bare bones interface used for socket processing. Per thread data is to be
* stored in the ThreadWithAttributes extra folders, or alternately in
* thread local fields.
*/
public interface Handler {
public enum SocketState {
OPEN, CLOSED, LONG
}
public SocketState process(NioChannel socket);
public SocketState event(NioChannel socket, SocketStatus status);
public void releaseCaches();
public void release(NioChannel socket);
}
// ------------------------------------------------- WorkerStack Inner Class
public class WorkerStack {
protected Worker[] workers = null;
protected int end = 0;
public WorkerStack(int size) {
workers = new Worker[size];
}
/**
* Put the object into the queue. If the queue is full (for example if
* the queue has been reduced in size) the object will be dropped.
*
* @param object the object to be appended to the queue (first
* element).
*/
public void push(Worker worker) {
if (end < workers.length) {
workers[end++] = worker;
} else {
curThreads--;
}
}
/**
* Get the first object out of the queue. Return null if the queue
* is empty.
*/
public Worker pop() {
if (end > 0) {
return workers[--end];
}
return null;
}
/**
* Get the first object out of the queue, Return null if the queue
* is empty.
*/
public Worker peek() {
return workers[end];
}
/**
* Is the queue empty?
*/
public boolean isEmpty() {
return (end == 0);
}
/**
* How many elements are there in this queue?
*/
public int size() {
return (end);
}
/**
* Resize the queue. If there are too many objects in the queue for the
* new size, drop the excess.
*
* @param newSize
*/
public void resize(int newSize) {
Worker[] newWorkers = new Worker[newSize];
int len = workers.length;
if (newSize < len) {
len = newSize;
}
System.arraycopy(workers, 0, newWorkers, 0, len);
workers = newWorkers;
}
}
// ---------------------------------------------- SocketProcessor Inner Class
/**
* This class is the equivalent of the Worker, but will simply use in an
* external Executor thread pool.
*/
protected class SocketProcessor implements Runnable {
protected NioChannel socket = null;
protected SocketStatus status = null;
public SocketProcessor(NioChannel socket, SocketStatus status) {
reset(socket,status);
}
public void reset(NioChannel socket, SocketStatus status) {
this.socket = socket;
this.status = status;
}
public void run() {
NioEndpoint.this.activeSocketProcessors.addAndGet(1);
SelectionKey key = null;
try {
key = socket.getIOChannel().keyFor(socket.getPoller().getSelector());
int handshake = -1;
try {
if (key!=null) handshake = socket.handshake(key.isReadable(), key.isWritable());
}catch ( IOException x ) {
handshake = -1;
if ( log.isDebugEnabled() ) log.debug("Error during SSL handshake",x);
}catch ( CancelledKeyException ckx ) {
handshake = -1;
}
if ( handshake == 0 ) {
// Process the request from this socket
boolean closed = (status==null)?(handler.process(socket)==Handler.SocketState.CLOSED) :
(handler.event(socket,status)==Handler.SocketState.CLOSED);
if (closed) {
// Close socket and pool
try {
KeyAttachment ka = null;
if (key!=null) {
ka = (KeyAttachment) key.attachment();
if (ka!=null) ka.setComet(false);
socket.getPoller().cancelledKey(key, SocketStatus.ERROR, false);
}
if (socket!=null) nioChannels.offer(socket);
socket = null;
if ( ka!=null ) keyCache.offer(ka);
ka = null;
}catch ( Exception x ) {
log.error("",x);
}
}
} else if (handshake == -1 ) {
KeyAttachment ka = null;
if (key!=null) {
ka = (KeyAttachment) key.attachment();
socket.getPoller().cancelledKey(key, SocketStatus.DISCONNECT, false);
}
if (socket!=null) nioChannels.offer(socket);
socket = null;
if ( ka!=null ) keyCache.offer(ka);
ka = null;
} else {
final SelectionKey fk = key;
final int intops = handshake;
final KeyAttachment ka = (KeyAttachment)fk.attachment();
ka.getPoller().add(socket,intops);
}
}catch(CancelledKeyException cx) {
socket.getPoller().cancelledKey(key,null,false);
} catch (OutOfMemoryError oom) {
try {
oomParachuteData = null;
socket.getPoller().cancelledKey(key,SocketStatus.ERROR,false);
releaseCaches();
log.error("", oom);
}catch ( Throwable oomt ) {
try {
System.err.println(oomParachuteMsg);
oomt.printStackTrace();
}catch (Throwable letsHopeWeDontGetHere){}
}
}catch ( Throwable t ) {
log.error("",t);
socket.getPoller().cancelledKey(key,SocketStatus.ERROR,false);
} finally {
socket = null;
status = null;
//return to cache
processorCache.offer(this);
NioEndpoint.this.activeSocketProcessors.addAndGet(-1); }
}
}
// ---------------------------------------------- TaskQueue Inner Class
public static class TaskQueue extends LinkedBlockingQueue {
ThreadPoolExecutor parent = null;
NioEndpoint endpoint = null;
public TaskQueue() {
super();
}
public TaskQueue(int initialCapacity) {
super(initialCapacity);
}
public TaskQueue(Collection c) {
super(c);
}
public void setParent(ThreadPoolExecutor tp, NioEndpoint ep) {
parent = tp;
this.endpoint = ep;
}
public boolean offer(Runnable o) {
//we can't do any checks
if (parent==null) return super.offer(o);
//we are maxed out on threads, simply queue the object
if (parent.getPoolSize() == parent.getMaximumPoolSize()) return super.offer(o);
//we have idle threads, just add it to the queue
//this is an approximation, so it could use some tuning
if (endpoint.activeSocketProcessors.get()<(parent.getPoolSize())) return super.offer(o);
//if we have less threads than maximum force creation of a new thread
if (parent.getPoolSize()
