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/**
* Copyright 2007-2015, Kaazing Corporation. All rights reserved.
*
* Licensed 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.
*/
/** The copyright above pertains to portions created by Kaazing */
package org.apache.mina.core.polling;
import java.io.IOException;
import java.net.PortUnreachableException;
import java.nio.channels.ClosedSelectorException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.Executor;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.file.FileRegion;
import org.apache.mina.core.filterchain.IoFilterChain;
import org.apache.mina.core.future.DefaultIoFuture;
import org.apache.mina.core.service.AbstractIoService;
import org.apache.mina.core.service.IoProcessor;
import org.apache.mina.core.session.AbstractIoSession;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.core.session.IoSessionConfig;
import org.apache.mina.core.session.SessionState;
import org.apache.mina.core.write.WriteRequest;
import org.apache.mina.core.write.WriteRequestQueue;
import org.apache.mina.core.write.WriteToClosedSessionException;
import org.apache.mina.transport.socket.AbstractDatagramSessionConfig;
import org.apache.mina.util.ExceptionMonitor;
import org.apache.mina.util.NamePreservingRunnable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* An abstract implementation of {@link IoProcessor} which helps
* transport developers to write an {@link IoProcessor} easily.
* This class is in charge of active polling a set of {@link IoSession}
* and trigger events when some I/O operation is possible.
*
* @author Apache MINA Project
*/
public abstract class AbstractPollingIoProcessor
implements IoProcessor {
/** A logger for this class */
private final static Logger LOG = LoggerFactory.getLogger(IoProcessor.class);
/**
* The maximum loop count for a write operation until
* {@link #write(AbstractIoSession, IoBuffer, int)} returns non-zero value.
* It is similar to what a spin lock is for in concurrency programming.
* It improves memory utilization and write throughput significantly.
*/
private static final int WRITE_SPIN_COUNT = 256;
/** A timeout used for the select, as we need to get out to deal with idle sessions */
private static final long SELECT_TIMEOUT = 10L;
/** A map containing the last Thread ID for each class */
private static final Map, AtomicInteger> threadIds = new HashMap, AtomicInteger>();
private final String threadName;
private final Executor executor;
/** A Session queue containing the newly created sessions */
private final Queue newSessions = new ConcurrentLinkedQueue();
/** A queue used to store the sessions to be removed */
private final Queue removingSessions = new ConcurrentLinkedQueue();
/** A queue used to store the sessions to be flushed */
private final Queue flushingSessions = new ConcurrentLinkedQueue();
/** A queue used to store the sessions which have a trafficControl to be updated */
private final Queue trafficControllingSessions = new ConcurrentLinkedQueue();
/** The processor thread : it handles the incoming messages */
private final AtomicReference processorRef = new AtomicReference();
private long lastIdleCheckTime;
private final Object disposalLock = new Object();
private volatile boolean disposing;
private volatile boolean disposed;
private final DefaultIoFuture disposalFuture = new DefaultIoFuture(null);
/**
* Create an {@link AbstractPollingIoProcessor} with the given {@link Executor}
* for handling I/Os events.
*
* @param executor the {@link Executor} for handling I/O events
*/
protected AbstractPollingIoProcessor(Executor executor) {
if (executor == null) {
throw new NullPointerException("executor");
}
this.threadName = nextThreadName();
this.executor = executor;
}
/**
* Compute the thread ID for this class instance. As we may have different
* classes, we store the last ID number into a Map associating the class
* name to the last assigned ID.
*
* @return a name for the current thread, based on the class name and
* an incremental value, starting at 1.
*/
private String nextThreadName() {
Class cls = getClass();
int newThreadId;
// We synchronize this block to avoid a concurrent access to
// the actomicInteger (it can be modified by another thread, while
// being seen as null by another thread)
synchronized (threadIds) {
// Get the current ID associated to this class' name
AtomicInteger threadId = threadIds.get(cls);
if (threadId == null) {
// We never have seen this class before, just create a
// new ID starting at 1 for it, and associate this ID
// with the class name in the map.
newThreadId = 1;
threadIds.put(cls, new AtomicInteger(newThreadId));
} else {
// Just increment the lat ID, and get it.
newThreadId = threadId.incrementAndGet();
}
}
// Now we can compute the name for this thread
return cls.getSimpleName() + '-' + newThreadId;
}
/**
* {@inheritDoc}
*/
public final boolean isDisposing() {
return disposing;
}
/**
* {@inheritDoc}
*/
public final boolean isDisposed() {
return disposed;
}
/**
* {@inheritDoc}
*/
public final void dispose() {
if (disposed) {
return;
}
synchronized (disposalLock) {
if (!disposing) {
disposing = true;
startupProcessor();
}
}
disposalFuture.awaitUninterruptibly();
disposed = true;
}
/**
* Dispose the resources used by this {@link IoProcessor} for polling
* the client connections
* @throws Exception if some low level IO error occurs
*/
protected abstract void dispose0() throws Exception;
/**
* poll those sessions for the given timeout
* @param timeout milliseconds before the call timeout if no event appear
* @return The number of session ready for read or for write
* @throws Exception if some low level IO error occurs
*/
protected abstract int select(long timeout) throws Exception;
/**
* poll those sessions forever
* @return The number of session ready for read or for write
* @throws Exception if some low level IO error occurs
*/
protected abstract int select() throws Exception;
/**
* Say if the list of {@link IoSession} polled by this {@link IoProcessor}
* is empty
* @return true if at least a session is managed by this {@link IoProcessor}
*/
protected abstract boolean isSelectorEmpty();
/**
* Interrupt the {@link AbstractPollingIoProcessor#select(int) call.
*/
protected abstract void wakeup();
/**
* Get an {@link Iterator} for the list of {@link IoSession} polled by this
* {@link IoProcessor}
* @return {@link Iterator} of {@link IoSession}
*/
protected abstract Iterator allSessions();
/**
* Get an {@link Iterator} for the list of {@link IoSession} found selected
* by the last call of {@link AbstractPollingIoProcessor#select(int)
* @return {@link Iterator} of {@link IoSession} read for I/Os operation
*/
protected abstract Iterator selectedSessions();
/**
* Get the state of a session (preparing, open, closed)
* @param session the {@link IoSession} to inspect
* @return the state of the session
*/
protected abstract SessionState getState(T session);
/**
* Determines the message (IoBuffer) that will actually get written
*/
protected Object getWriteRequestMessage(T session, WriteRequest writeRequest) {
return writeRequest.getMessage();
}
/**
* Is the session ready for writing
* @param session the session queried
* @return true is ready, false if not ready
*/
protected abstract boolean isWritable(T session);
/**
* Is the session ready for reading
* @param session the session queried
* @return true is ready, false if not ready
*/
protected abstract boolean isReadable(T session);
/**
* register a session for writing
* @param session the session registered
* @param isInterested true for registering, false for removing
*/
protected abstract void setInterestedInWrite(T session, boolean isInterested)
throws Exception;
/**
* register a session for reading
* @param session the session registered
* @param isInterested true for registering, false for removing
*/
protected abstract void setInterestedInRead(T session, boolean isInterested)
throws Exception;
/**
* is this session registered for reading
* @param session the session queried
* @return true is registered for reading
*/
protected abstract boolean isInterestedInRead(T session);
/**
* is this session registered for writing
* @param session the session queried
* @return true is registered for writing
*/
protected abstract boolean isInterestedInWrite(T session);
/**
* Initialize the polling of a session. Add it to the polling process.
* @param session the {@link IoSession} to add to the polling
* @throws Exception any exception thrown by the underlying system calls
*/
protected abstract void init(T session) throws Exception;
/**
* Destroy the underlying client socket handle
* @param session the {@link IoSession}
* @throws Exception any exception thrown by the underlying system calls
*/
protected abstract void destroy(T session) throws Exception;
/**
* Reads a sequence of bytes from a {@link IoSession} into the given {@link IoBuffer}.
* Is called when the session was found ready for reading.
* @param session the session to read
* @param buf the buffer to fill
* @return the number of bytes read
* @throws Exception any exception thrown by the underlying system calls
*/
protected abstract int read(T session, IoBuffer buf) throws Exception;
/**
* Write a sequence of bytes to a {@link IoSession}, means to be called when a session
* was found ready for writing.
* @param session the session to write
* @param buf the buffer to write
* @param length the number of bytes to write can be superior to the number of bytes remaining
* in the buffer
* @return the number of byte written
* @throws Exception any exception thrown by the underlying system calls
*/
protected abstract int write(T session, IoBuffer buf, int length)
throws Exception;
/**
* Write a part of a file to a {@link IoSession}, if the underlying API isn't supporting
* system calls like sendfile(), you can throw a {@link UnsupportedOperationException} so
* the file will be send using usual {@link #write(AbstractIoSession, IoBuffer, int)} call.
* @param session the session to write
* @param region the file region to write
* @param length the length of the portion to send
* @return the number of written bytes
* @throws Exception any exception thrown by the underlying system calls
*/
protected abstract int transferFile(T session, FileRegion region, int length)
throws Exception;
/**
* {@inheritDoc}
*/
public final void add(T session) {
if (isDisposing()) {
throw new IllegalStateException("Already disposed.");
}
// Adds the session to the newSession queue and starts the worker
// newSessions.add must precede startupProcessor
// for nSessions==0 case in Processor main loop
newSessions.add(session);
startupProcessor();
}
/**
* {@inheritDoc}
*/
public final void remove(T session) {
scheduleRemove(session);
startupProcessor();
}
private void scheduleRemove(T session) {
removingSessions.add(session);
}
/**
* {@inheritDoc}
*/
public final void flush(T session) {
if (scheduleFlush(session)) {
wakeup();
}
}
private boolean scheduleFlush(T session) {
if (session.setScheduledForFlush(true)) {
// add the session to the queue
flushingSessions.add(session);
return true;
}
return false;
}
/**
* {@inheritDoc}
*/
public final void updateTrafficMask(T session) {
scheduleTrafficControl(session);
wakeup();
}
private void scheduleTrafficControl(T session) {
trafficControllingSessions.add(session);
}
/**
* Starts the inner Processor, asking the executor to pick a thread in its
* pool. The Runnable will be renamed
*/
private void startupProcessor() {
Processor processor = processorRef.get();
if (processor == null) {
processor = new Processor();
if (processorRef.compareAndSet(null, processor)) {
executor.execute(new NamePreservingRunnable(processor,
threadName));
}
}
// Just stop the select() and start it again, so that the processor
// can be activated immediately.
wakeup();
}
/**
* Loops over the new sessions blocking queue and returns
* the number of sessions which are effectively created
*
* @return The number of new sessions
*/
private int handleNewSessions() {
int addedSessions = 0;
for (;;) {
T session = newSessions.poll();
if (session == null) {
// All new sessions have been handled
break;
}
if (addNow(session)) {
// A new session has been created
addedSessions++;
}
}
return addedSessions;
}
private boolean addNow(T session) {
boolean registered = false;
boolean notified = false;
try {
init(session);
registered = true;
// Build the filter chain of this session.
session.getService().getFilterChainBuilder().buildFilterChain(
session.getFilterChain());
// DefaultIoFilterChain.CONNECT_FUTURE is cleared inside here
// in AbstractIoFilterChain.fireSessionOpened().
((AbstractIoService) session.getService()).getListeners()
.fireSessionCreated(session);
notified = true;
} catch (Throwable e) {
if (notified) {
// Clear the DefaultIoFilterChain.CONNECT_FUTURE attribute
// and call ConnectFuture.setException().
scheduleRemove(session);
IoFilterChain filterChain = session.getFilterChain();
filterChain.fireExceptionCaught(e);
wakeup();
} else {
ExceptionMonitor.getInstance().exceptionCaught(e);
try {
destroy(session);
} catch (Exception e1) {
ExceptionMonitor.getInstance().exceptionCaught(e1);
} finally {
registered = false;
}
}
}
return registered;
}
private int removeSessions() {
int removedSessions = 0;
for (;;) {
T session = removingSessions.poll();
if (session == null) {
// No session to remove. Get out.
return removedSessions;
}
SessionState state = getState(session);
switch (state) {
case OPENED:
if (removeNow(session)) {
removedSessions++;
}
break;
case CLOSING:
// Skip if channel is already closed
break;
case OPENING:
// Remove session from the newSessions queue and
// remove it
newSessions.remove(session);
if (removeNow(session)) {
removedSessions++;
}
break;
default:
throw new IllegalStateException(String.valueOf(state));
}
}
}
private boolean removeNow(T session) {
clearWriteRequestQueue(session);
try {
destroy(session);
return true;
} catch (Exception e) {
IoFilterChain filterChain = session.getFilterChain();
filterChain.fireExceptionCaught(e);
} finally {
clearWriteRequestQueue(session);
((AbstractIoService) session.getService()).getListeners()
.fireSessionDestroyed(session);
}
return false;
}
private void clearWriteRequestQueue(T session) {
WriteRequestQueue writeRequestQueue = session.getWriteRequestQueue();
WriteRequest req;
List failedRequests = new ArrayList();
if ((req = writeRequestQueue.poll(session)) != null) {
Object m = req.getMessage();
if (m instanceof IoBuffer) {
IoBuffer buf = (IoBuffer) req.getMessage();
// The first unwritten empty buffer must be
// forwarded to the filter chain.
if (buf.hasRemaining()) {
buf.reset();
failedRequests.add(req);
} else {
IoFilterChain filterChain = session.getFilterChain();
filterChain.fireMessageSent(req);
}
} else {
failedRequests.add(req);
}
// Discard others.
while ((req = writeRequestQueue.poll(session)) != null) {
failedRequests.add(req);
}
}
// Create an exception and notify.
if (!failedRequests.isEmpty()) {
WriteToClosedSessionException cause = new WriteToClosedSessionException(
failedRequests);
for (WriteRequest r : failedRequests) {
session.decreaseScheduledBytesAndMessages(r);
r.getFuture().setException(cause);
}
IoFilterChain filterChain = session.getFilterChain();
filterChain.fireExceptionCaught(cause);
}
}
private void process() throws Exception {
for (Iterator i = selectedSessions(); i.hasNext();) {
T session = i.next();
process(session);
i.remove();
}
}
/**
* Deal with session ready for the read or write operations, or both.
*/
private void process(T session) {
// Process Reads
if (isReadable(session) && !session.isReadSuspended()) {
read(session);
}
// Process writes
if (isWritable(session) && !session.isWriteSuspended()) {
scheduleFlush(session);
}
}
private void read(T session) {
IoSessionConfig config = session.getConfig();
IoBuffer buf = newReadBuffer(config.getReadBufferSize());
final boolean hasFragmentation = session.getTransportMetadata()
.hasFragmentation();
try {
int readBytes = 0;
int ret;
try {
if (hasFragmentation) {
while ((ret = read(session, buf)) > 0) {
readBytes += ret;
if (!buf.hasRemaining()) {
break;
}
}
} else {
ret = read(session, buf);
if (ret > 0) {
readBytes = ret;
}
}
} finally {
buf.flip();
}
if (readBytes > 0) {
IoFilterChain filterChain = session.getFilterChain();
filterChain.fireMessageReceived(buf);
buf = null;
if (hasFragmentation) {
if (readBytes << 1 < config.getReadBufferSize()) {
session.decreaseReadBufferSize();
} else if (readBytes == config.getReadBufferSize()) {
session.increaseReadBufferSize();
}
}
}
if (ret < 0) {
scheduleRemove(session);
}
} catch (Throwable e) {
if (e instanceof IOException) {
if (!(e instanceof PortUnreachableException)
|| !AbstractDatagramSessionConfig.class
.isAssignableFrom(config.getClass())
|| ((AbstractDatagramSessionConfig) config)
.isCloseOnPortUnreachable())
scheduleRemove(session);
}
IoFilterChain filterChain = session.getFilterChain();
filterChain.fireExceptionCaught(e);
}
}
protected IoBuffer newReadBuffer(int readBufferSize) {
return IoBuffer.allocate(readBufferSize);
}
private void notifyIdleSessions(long currentTime) throws Exception {
// process idle sessions
if (currentTime - lastIdleCheckTime >= SELECT_TIMEOUT) {
lastIdleCheckTime = currentTime;
AbstractIoSession.notifyIdleness(allSessions(), currentTime);
}
}
private void flush(long currentTime) {
final T firstSession = flushingSessions.peek();
if (firstSession == null) {
return;
}
T session = flushingSessions.poll(); // the same one with firstSession
for (;;) {
session.setScheduledForFlush(false);
SessionState state = getState(session);
switch (state) {
case OPENED:
try {
boolean flushedAll = flushNow(session, currentTime);
if (flushedAll
&& !session.getWriteRequestQueue().isEmpty(session)
&& !session.isScheduledForFlush()) {
scheduleFlush(session);
}
} catch (Exception e) {
scheduleRemove(session);
IoFilterChain filterChain = session.getFilterChain();
filterChain.fireExceptionCaught(e);
}
break;
case CLOSING:
// Skip if the channel is already closed.
break;
case OPENING:
// Retry later if session is not yet fully initialized.
// (In case that Session.write() is called before addSession() is processed)
scheduleFlush(session);
return;
default:
throw new IllegalStateException(String.valueOf(state));
}
session = flushingSessions.peek();
if (session == null || session == firstSession) {
break;
}
session = flushingSessions.poll();
}
}
private boolean flushNow(T session, long currentTime) {
if (!session.isConnected()) {
scheduleRemove(session);
return false;
}
final boolean hasFragmentation = session.getTransportMetadata()
.hasFragmentation();
final WriteRequestQueue writeRequestQueue = session
.getWriteRequestQueue();
// Set limitation for the number of written bytes for read-write
// fairness. I used maxReadBufferSize * 3 / 2, which yields best
// performance in my experience while not breaking fairness much.
final int maxWrittenBytes = session.getConfig().getMaxReadBufferSize()
+ (session.getConfig().getMaxReadBufferSize() >>> 1);
int writtenBytes = 0;
WriteRequest req = null;
try {
// Clear OP_WRITE
setInterestedInWrite(session, false);
do {
// Check for pending writes.
req = session.getCurrentWriteRequest();
if (req == null) {
req = writeRequestQueue.poll(session);
if (req == null) {
break;
}
session.setCurrentWriteRequest(req);
}
int localWrittenBytes = 0;
Object message = getWriteRequestMessage(session, req);
if (message instanceof IoBuffer) {
localWrittenBytes = writeBuffer(session, req, (IoBuffer)message,
hasFragmentation, maxWrittenBytes - writtenBytes,
currentTime);
if (localWrittenBytes > 0 && ((IoBuffer)getWriteRequestMessage(session, req)).hasRemaining()) {
// the buffer isn't empty, we re-interest it in writing
writtenBytes += localWrittenBytes;
setInterestedInWrite(session, true);
return false;
}
} else if (message instanceof FileRegion) {
localWrittenBytes = writeFile(session, req,
hasFragmentation, maxWrittenBytes - writtenBytes,
currentTime);
// Fix for Java bug on Linux http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5103988
// If there's still data to be written in the FileRegion, return 0 indicating that we need
// to pause until writing may resume.
if (localWrittenBytes > 0
&& ((FileRegion) message).getRemainingBytes() > 0) {
writtenBytes += localWrittenBytes;
setInterestedInWrite(session, true);
return false;
}
} else {
throw new IllegalStateException(
"Don't know how to handle message of type '"
+ message.getClass().getName()
+ "'. Are you missing a protocol encoder?");
}
if (localWrittenBytes == 0) {
// Kernel buffer is full.
setInterestedInWrite(session, true);
return false;
}
writtenBytes += localWrittenBytes;
if (writtenBytes >= maxWrittenBytes) {
// Wrote too much
scheduleFlush(session);
return false;
}
} while (writtenBytes < maxWrittenBytes);
} catch (Exception e) {
if (req != null) {
req.getFuture().setException(e);
}
IoFilterChain filterChain = session.getFilterChain();
filterChain.fireExceptionCaught(e);
return false;
}
return true;
}
protected int writeBuffer(T session, WriteRequest req, IoBuffer buf,
boolean hasFragmentation, int maxLength, long currentTime)
throws Exception {
int localWrittenBytes = 0;
if (buf.hasRemaining()) {
int length;
if (hasFragmentation) {
length = Math.min(buf.remaining(), maxLength);
} else {
length = buf.remaining();
}
for (int i = WRITE_SPIN_COUNT; i > 0; i--) {
localWrittenBytes = write(session, buf, length);
if (localWrittenBytes != 0) {
break;
}
}
}
session.increaseWrittenBytes(localWrittenBytes, currentTime);
if (!buf.hasRemaining() || !hasFragmentation && localWrittenBytes != 0) {
// Buffer has been sent, clear the current request.
buf.reset();
fireMessageSent(session, req);
}
return localWrittenBytes;
}
private int writeFile(T session, WriteRequest req,
boolean hasFragmentation, int maxLength, long currentTime)
throws Exception {
int localWrittenBytes;
FileRegion region = (FileRegion) req.getMessage();
if (region.getRemainingBytes() > 0) {
int length;
if (hasFragmentation) {
length = (int) Math.min(region.getRemainingBytes(), maxLength);
} else {
length = (int) Math.min(Integer.MAX_VALUE, region
.getRemainingBytes());
}
localWrittenBytes = transferFile(session, region, length);
region.update(localWrittenBytes);
} else {
localWrittenBytes = 0;
}
session.increaseWrittenBytes(localWrittenBytes, currentTime);
if (region.getRemainingBytes() <= 0 || !hasFragmentation
&& localWrittenBytes != 0) {
fireMessageSent(session, req);
}
return localWrittenBytes;
}
private void fireMessageSent(T session, WriteRequest req) {
session.setCurrentWriteRequest(null);
IoFilterChain filterChain = session.getFilterChain();
filterChain.fireMessageSent(req);
}
/**
* Update the trafficControl for all the session which has
* just been opened.
*/
private void updateTrafficMask() {
int queueSize = trafficControllingSessions.size();
while (queueSize > 0) {
T session = trafficControllingSessions.poll();
if (session == null) {
return;
}
SessionState state = getState(session);
switch (state) {
case OPENED:
updateTrafficControl(session);
break;
case CLOSING:
break;
case OPENING:
// Retry later if session is not yet fully initialized.
// (In case that Session.suspend??() or session.resume??() is
// called before addSession() is processed)
// We just put back the session at the end of the queue.
trafficControllingSessions.add(session);
break;
default:
throw new IllegalStateException(String.valueOf(state));
}
// As we have handled one session, decrement the number of
// remaining sessions.
queueSize--;
}
}
/**
* {@inheritDoc}
*/
public void updateTrafficControl(T session) {
try {
setInterestedInRead(session, !session.isReadSuspended());
} catch (Exception e) {
IoFilterChain filterChain = session.getFilterChain();
filterChain.fireExceptionCaught(e);
}
try {
setInterestedInWrite(session,
!session.getWriteRequestQueue().isEmpty(session) &&
!session.isWriteSuspended());
} catch (Exception e) {
IoFilterChain filterChain = session.getFilterChain();
filterChain.fireExceptionCaught(e);
}
}
private class Processor implements Runnable {
public void run() {
assert (processorRef.get() == this);
int nSessions = 0;
lastIdleCheckTime = System.currentTimeMillis();
for (;;) {
try {
// This select has a timeout so that we can manage
// idle session when we get out of the select every
// second. (note : this is a hack to avoid creating
// a dedicated thread).
int selected = select(SELECT_TIMEOUT);
nSessions += handleNewSessions();
updateTrafficMask();
// Now, if we have had some incoming or outgoing events,
// deal with them
if (selected > 0) {
process();
}
long currentTime = System.currentTimeMillis();
flush(currentTime);
nSessions -= removeSessions();
notifyIdleSessions(currentTime);
if (nSessions == 0) {
processorRef.set(null);
if (newSessions.isEmpty() && isSelectorEmpty()) {
// newSessions.add() precedes startupProcessor
assert (processorRef.get() != this);
break;
}
assert (processorRef.get() != this);
if (!processorRef.compareAndSet(null, this)) {
// startupProcessor won race, so must exit processor
assert (processorRef.get() != this);
break;
}
assert (processorRef.get() == this);
}
// Disconnect all sessions immediately if disposal has been
// requested so that we exit this loop eventually.
if (isDisposing()) {
for (Iterator i = allSessions(); i.hasNext();) {
scheduleRemove(i.next());
}
wakeup();
}
} catch (ClosedSelectorException e) {
// make sure that throwing a SelectorClosedException (or similar)
// from select(SELECT_TIMEOUT) or allSessions() cannot prevent processor disposal
processorRef.set(null);
break;
} catch (Throwable t) {
ExceptionMonitor.getInstance().exceptionCaught(t);
try {
Thread.sleep(1000);
} catch (InterruptedException e1) {
ExceptionMonitor.getInstance().exceptionCaught(e1);
}
}
}
try {
synchronized (disposalLock) {
if (isDisposing()) {
dispose0();
}
}
} catch (Throwable t) {
ExceptionMonitor.getInstance().exceptionCaught(t);
} finally {
disposalFuture.setValue(true);
}
}
}
}
