diff options
Diffstat (limited to 'qpid/java/common/src/main/java/org/apache/mina/transport/socket/nio/MultiThreadSocketIoProcessor.java')
| -rw-r--r-- | qpid/java/common/src/main/java/org/apache/mina/transport/socket/nio/MultiThreadSocketIoProcessor.java | 1026 |
1 files changed, 1026 insertions, 0 deletions
diff --git a/qpid/java/common/src/main/java/org/apache/mina/transport/socket/nio/MultiThreadSocketIoProcessor.java b/qpid/java/common/src/main/java/org/apache/mina/transport/socket/nio/MultiThreadSocketIoProcessor.java new file mode 100644 index 0000000000..c23ad8686f --- /dev/null +++ b/qpid/java/common/src/main/java/org/apache/mina/transport/socket/nio/MultiThreadSocketIoProcessor.java @@ -0,0 +1,1026 @@ +/* + * 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.mina.transport.socket.nio; + +import edu.emory.mathcs.backport.java.util.concurrent.Executor; +import edu.emory.mathcs.backport.java.util.concurrent.locks.ReentrantLock; +import org.apache.mina.common.ByteBuffer; +import org.apache.mina.common.ExceptionMonitor; +import org.apache.mina.common.IdleStatus; +import org.apache.mina.common.IoFilter.WriteRequest; +import org.apache.mina.common.WriteTimeoutException; +import org.apache.mina.util.IdentityHashSet; +import org.apache.mina.util.NamePreservingRunnable; +import org.apache.mina.util.Queue; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.IOException; +import java.nio.channels.SelectionKey; +import java.nio.channels.Selector; +import java.nio.channels.SocketChannel; +import java.util.Iterator; +import java.util.Set; +import java.util.concurrent.BlockingQueue; +import java.util.concurrent.LinkedBlockingQueue; + +/** + * Performs all I/O operations for sockets which is connected or bound. This class is used by MINA internally. + * + * @author The Apache Directory Project (mina-dev@directory.apache.org) + * @version $Rev: 619823 $, $Date: 2008-02-08 10:09:37 +0000 (Fri, 08 Feb 2008) $, + */ +class MultiThreadSocketIoProcessor extends SocketIoProcessor +{ + Logger _logger = LoggerFactory.getLogger(MultiThreadSocketIoProcessor.class); + Logger _loggerRead = LoggerFactory.getLogger(MultiThreadSocketIoProcessor.class + ".Reader"); + Logger _loggerWrite = LoggerFactory.getLogger(MultiThreadSocketIoProcessor.class + ".Writer"); + + private static final long SELECTOR_TIMEOUT = 1000L; + + private int MAX_READ_BYTES_PER_SESSION = 524288; //512K + private int MAX_FLUSH_BYTES_PER_SESSION = 524288; //512K + + private final Object readLock = new Object(); + private final Object writeLock = new Object(); + + private final String threadName; + private final Executor executor; + + private ReentrantLock trafficMaskUpdateLock = new ReentrantLock(); + + /** @noinspection FieldAccessedSynchronizedAndUnsynchronized */ + private volatile Selector selector, writeSelector; + + private final Queue newSessions = new Queue(); + private final Queue removingSessions = new Queue(); + private final BlockingQueue flushingSessions = new LinkedBlockingQueue(); + private final IdentityHashSet flushingSessionsSet = new IdentityHashSet(); + + private final Queue trafficControllingSessions = new Queue(); + + private ReadWorker readWorker; + private WriteWorker writeWorker; + private long lastIdleReadCheckTime = System.currentTimeMillis(); + private long lastIdleWriteCheckTime = System.currentTimeMillis(); + + MultiThreadSocketIoProcessor(String threadName, Executor executor) + { + super(threadName, executor); + this.threadName = threadName; + this.executor = executor; + } + + void addNew(SocketSessionImpl session) throws IOException + { + synchronized (newSessions) + { + newSessions.push(session); + } + + startupWorker(); + + selector.wakeup(); + writeSelector.wakeup(); + } + + void remove(SocketSessionImpl session) throws IOException + { + scheduleRemove(session); + startupWorker(); + selector.wakeup(); + } + + private void startupWorker() throws IOException + { + synchronized (readLock) + { + if (readWorker == null) + { + selector = Selector.open(); + readWorker = new ReadWorker(); + executor.execute(new NamePreservingRunnable(readWorker)); + } + } + + synchronized (writeLock) + { + if (writeWorker == null) + { + writeSelector = Selector.open(); + writeWorker = new WriteWorker(); + executor.execute(new NamePreservingRunnable(writeWorker)); + } + } + + } + + void flush(SocketSessionImpl session) + { + scheduleFlush(session); + Selector selector = this.writeSelector; + + if (selector != null) + { + selector.wakeup(); + } + } + + void updateTrafficMask(SocketSessionImpl session) + { + scheduleTrafficControl(session); + Selector selector = this.selector; + if (selector != null) + { + selector.wakeup(); + } + } + + private void scheduleRemove(SocketSessionImpl session) + { + synchronized (removingSessions) + { + removingSessions.push(session); + } + } + + private void scheduleFlush(SocketSessionImpl session) + { + synchronized (flushingSessionsSet) + { + //if flushingSessions grows to contain Integer.MAX_VALUE sessions + // then this will fail. + if (flushingSessionsSet.add(session)) + { + flushingSessions.offer(session); + } + } + } + + private void scheduleTrafficControl(SocketSessionImpl session) + { + synchronized (trafficControllingSessions) + { + trafficControllingSessions.push(session); + } + } + + private void doAddNewReader() throws InterruptedException + { + if (newSessions.isEmpty()) + { + return; + } + + for (; ;) + { + MultiThreadSocketSessionImpl session; + + synchronized (newSessions) + { + session = (MultiThreadSocketSessionImpl) newSessions.peek(); + } + + if (session == null) + { + break; + } + + SocketChannel ch = session.getChannel(); + + + try + { + + ch.configureBlocking(false); + session.setSelectionKey(ch.register(selector, + SelectionKey.OP_READ, + session)); + + //System.out.println("ReadDebug:"+"Awaiting Registration"); + session.awaitRegistration(); + sessionCreated(session); + } + catch (IOException e) + { + // Clear the AbstractIoFilterChain.CONNECT_FUTURE attribute + // and call ConnectFuture.setException(). + session.getFilterChain().fireExceptionCaught(session, e); + } + } + } + + + private void doAddNewWrite() throws InterruptedException + { + if (newSessions.isEmpty()) + { + return; + } + + for (; ;) + { + MultiThreadSocketSessionImpl session; + + synchronized (newSessions) + { + session = (MultiThreadSocketSessionImpl) newSessions.peek(); + } + + if (session == null) + { + break; + } + + SocketChannel ch = session.getChannel(); + + try + { + ch.configureBlocking(false); + synchronized (flushingSessionsSet) + { + flushingSessionsSet.add(session); + } + + session.setWriteSelectionKey(ch.register(writeSelector, + SelectionKey.OP_WRITE, + session)); + + //System.out.println("WriteDebug:"+"Awaiting Registration"); + session.awaitRegistration(); + sessionCreated(session); + } + catch (IOException e) + { + + // Clear the AbstractIoFilterChain.CONNECT_FUTURE attribute + // and call ConnectFuture.setException(). + session.getFilterChain().fireExceptionCaught(session, e); + } + } + } + + + private void sessionCreated(SocketSessionImpl sessionParam) throws InterruptedException + { + MultiThreadSocketSessionImpl session = (MultiThreadSocketSessionImpl) sessionParam; + synchronized (newSessions) + { + if (!session.created()) + { + _logger.debug("Popping new session"); + newSessions.pop(); + + // AbstractIoFilterChain.CONNECT_FUTURE is cleared inside here + // in AbstractIoFilterChain.fireSessionOpened(). + session.getServiceListeners().fireSessionCreated(session); + + session.doneCreation(); + } + } + } + + private void doRemove() + { + if (removingSessions.isEmpty()) + { + return; + } + + for (; ;) + { + MultiThreadSocketSessionImpl session; + + synchronized (removingSessions) + { + session = (MultiThreadSocketSessionImpl) removingSessions.pop(); + } + + if (session == null) + { + break; + } + + SocketChannel ch = session.getChannel(); + SelectionKey key = session.getReadSelectionKey(); + SelectionKey writeKey = session.getWriteSelectionKey(); + + // Retry later if session is not yet fully initialized. + // (In case that Session.close() is called before addSession() is processed) + if (key == null || writeKey == null) + { + scheduleRemove(session); + break; + } + // skip if channel is already closed + if (!key.isValid() || !writeKey.isValid()) + { + continue; + } + + try + { + //System.out.println("ReadDebug:"+"Removing Session: " + System.identityHashCode(session)); + synchronized (readLock) + { + key.cancel(); + } + synchronized (writeLock) + { + writeKey.cancel(); + } + ch.close(); + } + catch (IOException e) + { + session.getFilterChain().fireExceptionCaught(session, e); + } + finally + { + releaseWriteBuffers(session); + session.getServiceListeners().fireSessionDestroyed(session); + } + } + } + + private void processRead(Set selectedKeys) + { + Iterator it = selectedKeys.iterator(); + + while (it.hasNext()) + { + SelectionKey key = (SelectionKey) it.next(); + MultiThreadSocketSessionImpl session = (MultiThreadSocketSessionImpl) key.attachment(); + + synchronized (readLock) + { + if (key.isValid() && key.isReadable() && session.getTrafficMask().isReadable()) + { + read(session); + } + } + + } + + selectedKeys.clear(); + } + + private void processWrite(Set selectedKeys) + { + Iterator it = selectedKeys.iterator(); + + while (it.hasNext()) + { + SelectionKey key = (SelectionKey) it.next(); + SocketSessionImpl session = (SocketSessionImpl) key.attachment(); + + synchronized (writeLock) + { + if (key.isValid() && key.isWritable() && session.getTrafficMask().isWritable()) + { + + // Clear OP_WRITE + key.interestOps(key.interestOps() & (~SelectionKey.OP_WRITE)); + + synchronized (flushingSessionsSet) + { + flushingSessions.offer(session); + } + } + } + } + + selectedKeys.clear(); + } + + private void read(SocketSessionImpl session) + { + + //if (_loggerWrite.isDebugEnabled()) + { + //System.out.println("WriteDebug:"+"Starting read for Session:" + System.identityHashCode(session)); + } + + int totalReadBytes = 0; + + while (totalReadBytes <= MAX_READ_BYTES_PER_SESSION) + { + ByteBuffer buf = ByteBuffer.allocate(session.getReadBufferSize()); + SocketChannel ch = session.getChannel(); + + try + { + buf.clear(); + + int readBytes = 0; + int ret; + + try + { + while ((ret = ch.read(buf.buf())) > 0) + { + readBytes += ret; + totalReadBytes += ret; + } + } + finally + { + buf.flip(); + } + + + if (readBytes > 0) + { + session.increaseReadBytes(readBytes); + + session.getFilterChain().fireMessageReceived(session, buf); + buf = null; + } + + if (ret <= 0) + { + if (ret == 0) + { + if (readBytes == session.getReadBufferSize()) + { + continue; + } + } + else + { + scheduleRemove(session); + } + + break; + } + } + catch (Throwable e) + { + if (e instanceof IOException) + { + scheduleRemove(session); + } + session.getFilterChain().fireExceptionCaught(session, e); + + //Stop Reading this session. + return; + } + finally + { + if (buf != null) + { + buf.release(); + } + } + }//for + + // if (_loggerWrite.isDebugEnabled()) + { + //System.out.println("WriteDebug:"+"Read for Session:" + System.identityHashCode(session) + " got: " + totalReadBytes); + } + } + + + private void notifyReadIdleness() + { + // process idle sessions + long currentTime = System.currentTimeMillis(); + if ((currentTime - lastIdleReadCheckTime) >= 1000) + { + lastIdleReadCheckTime = currentTime; + Set keys = selector.keys(); + if (keys != null) + { + for (Iterator it = keys.iterator(); it.hasNext();) + { + SelectionKey key = (SelectionKey) it.next(); + SocketSessionImpl session = (SocketSessionImpl) key.attachment(); + notifyReadIdleness(session, currentTime); + } + } + } + } + + private void notifyWriteIdleness() + { + // process idle sessions + long currentTime = System.currentTimeMillis(); + if ((currentTime - lastIdleWriteCheckTime) >= 1000) + { + lastIdleWriteCheckTime = currentTime; + Set keys = writeSelector.keys(); + if (keys != null) + { + for (Iterator it = keys.iterator(); it.hasNext();) + { + SelectionKey key = (SelectionKey) it.next(); + SocketSessionImpl session = (SocketSessionImpl) key.attachment(); + notifyWriteIdleness(session, currentTime); + } + } + } + } + + private void notifyReadIdleness(SocketSessionImpl session, long currentTime) + { + notifyIdleness0( + session, currentTime, + session.getIdleTimeInMillis(IdleStatus.BOTH_IDLE), + IdleStatus.BOTH_IDLE, + Math.max(session.getLastIoTime(), session.getLastIdleTime(IdleStatus.BOTH_IDLE))); + notifyIdleness0( + session, currentTime, + session.getIdleTimeInMillis(IdleStatus.READER_IDLE), + IdleStatus.READER_IDLE, + Math.max(session.getLastReadTime(), session.getLastIdleTime(IdleStatus.READER_IDLE))); + + notifyWriteTimeout(session, currentTime, session + .getWriteTimeoutInMillis(), session.getLastWriteTime()); + } + + private void notifyWriteIdleness(SocketSessionImpl session, long currentTime) + { + notifyIdleness0( + session, currentTime, + session.getIdleTimeInMillis(IdleStatus.BOTH_IDLE), + IdleStatus.BOTH_IDLE, + Math.max(session.getLastIoTime(), session.getLastIdleTime(IdleStatus.BOTH_IDLE))); + notifyIdleness0( + session, currentTime, + session.getIdleTimeInMillis(IdleStatus.WRITER_IDLE), + IdleStatus.WRITER_IDLE, + Math.max(session.getLastWriteTime(), session.getLastIdleTime(IdleStatus.WRITER_IDLE))); + + notifyWriteTimeout(session, currentTime, session + .getWriteTimeoutInMillis(), session.getLastWriteTime()); + } + + private void notifyIdleness0(SocketSessionImpl session, long currentTime, + long idleTime, IdleStatus status, + long lastIoTime) + { + if (idleTime > 0 && lastIoTime != 0 + && (currentTime - lastIoTime) >= idleTime) + { + session.increaseIdleCount(status); + session.getFilterChain().fireSessionIdle(session, status); + } + } + + private void notifyWriteTimeout(SocketSessionImpl session, + long currentTime, + long writeTimeout, long lastIoTime) + { + + MultiThreadSocketSessionImpl sesh = (MultiThreadSocketSessionImpl) session; + SelectionKey key = sesh.getWriteSelectionKey(); + + synchronized (writeLock) + { + if (writeTimeout > 0 + && (currentTime - lastIoTime) >= writeTimeout + && key != null && key.isValid() + && (key.interestOps() & SelectionKey.OP_WRITE) != 0) + { + session.getFilterChain().fireExceptionCaught(session, new WriteTimeoutException()); + } + } + } + + private SocketSessionImpl getNextFlushingSession() + { + return (SocketSessionImpl) flushingSessions.poll(); + } + + private void releaseSession(SocketSessionImpl session) + { + synchronized (session.getWriteRequestQueue()) + { + synchronized (flushingSessionsSet) + { + if (session.getScheduledWriteRequests() > 0) + { + if (_loggerWrite.isDebugEnabled()) + { + //System.out.println("WriteDebug:"+"Reflush" + System.identityHashCode(session)); + } + flushingSessions.offer(session); + } + else + { + if (_loggerWrite.isDebugEnabled()) + { + //System.out.println("WriteDebug:"+"Releasing session " + System.identityHashCode(session)); + } + flushingSessionsSet.remove(session); + } + } + } + } + + private void releaseWriteBuffers(SocketSessionImpl session) + { + Queue writeRequestQueue = session.getWriteRequestQueue(); + WriteRequest req; + + //Should this be synchronized? + synchronized (writeRequestQueue) + { + while ((req = (WriteRequest) writeRequestQueue.pop()) != null) + { + try + { + ((ByteBuffer) req.getMessage()).release(); + } + catch (IllegalStateException e) + { + session.getFilterChain().fireExceptionCaught(session, e); + } + finally + { + req.getFuture().setWritten(false); + } + } + } + } + + private void doFlush() + { + MultiThreadSocketSessionImpl session; + + while ((session = (MultiThreadSocketSessionImpl) getNextFlushingSession()) != null) + { + if (!session.isConnected()) + { + releaseWriteBuffers(session); + releaseSession(session); + continue; + } + + SelectionKey key = session.getWriteSelectionKey(); + // Retry later if session is not yet fully initialized. + // (In case that Session.write() is called before addSession() is processed) + if (key == null) + { + scheduleFlush(session); + releaseSession(session); + continue; + } + // skip if channel is already closed + if (!key.isValid()) + { + releaseSession(session); + continue; + } + + try + { + if (doFlush(session)) + { + releaseSession(session); + } + } + catch (IOException e) + { + releaseSession(session); + scheduleRemove(session); + session.getFilterChain().fireExceptionCaught(session, e); + } + + } + + } + + private boolean doFlush(SocketSessionImpl sessionParam) throws IOException + { + MultiThreadSocketSessionImpl session = (MultiThreadSocketSessionImpl) sessionParam; + // Clear OP_WRITE + SelectionKey key = session.getWriteSelectionKey(); + synchronized (writeLock) + { + key.interestOps(key.interestOps() & (~SelectionKey.OP_WRITE)); + } + SocketChannel ch = session.getChannel(); + Queue writeRequestQueue = session.getWriteRequestQueue(); + + long totalFlushedBytes = 0; + while (true) + { + WriteRequest req; + + synchronized (writeRequestQueue) + { + req = (WriteRequest) writeRequestQueue.first(); + } + + if (req == null) + { + break; + } + + ByteBuffer buf = (ByteBuffer) req.getMessage(); + if (buf.remaining() == 0) + { + synchronized (writeRequestQueue) + { + writeRequestQueue.pop(); + } + + session.increaseWrittenMessages(); + + buf.reset(); + session.getFilterChain().fireMessageSent(session, req); + continue; + } + + + int writtenBytes = 0; + + // Reported as DIRMINA-362 + //note: todo: fixme: Not sure it is important but if we see NoyYetConnected exceptions or 100% CPU in the kernel then this is it. + if (key.isWritable()) + { + writtenBytes = ch.write(buf.buf()); + totalFlushedBytes += writtenBytes; + } + + if (writtenBytes > 0) + { + session.increaseWrittenBytes(writtenBytes); + } + + if (buf.hasRemaining() || (totalFlushedBytes <= MAX_FLUSH_BYTES_PER_SESSION)) + { + // Kernel buffer is full + synchronized (writeLock) + { + key.interestOps(key.interestOps() | SelectionKey.OP_WRITE); + } + if (_loggerWrite.isDebugEnabled()) + { + //System.out.println("WriteDebug:"+"Written BF: " + (session.getWrittenBytes() - totalFlushedBytes) + " bytes"); + } + return false; + } + } + + if (_loggerWrite.isDebugEnabled()) + { + //System.out.println("WriteDebug:"+"Written : " + (session.getWrittenBytes() - totalFlushedBytes) + " bytes"); + } + return true; + } + + private void doUpdateTrafficMask() + { + if (trafficControllingSessions.isEmpty() || trafficMaskUpdateLock.isLocked()) + { + return; + } + + // Synchronize over entire operation as this method should be called + // from both read and write thread and we don't want the order of the + // updates to get changed. + trafficMaskUpdateLock.lock(); + try + { + for (; ;) + { + MultiThreadSocketSessionImpl session; + + session = (MultiThreadSocketSessionImpl) trafficControllingSessions.pop(); + + if (session == null) + { + break; + } + + SelectionKey key = session.getReadSelectionKey(); + // Retry later if session is not yet fully initialized. + // (In case that Session.suspend??() or session.resume??() is + // called before addSession() is processed) + if (key == null) + { + scheduleTrafficControl(session); + break; + } + // skip if channel is already closed + if (!key.isValid()) + { + continue; + } + + // The normal is OP_READ and, if there are write requests in the + // session's write queue, set OP_WRITE to trigger flushing. + + //Sset to Read and Write if there is nothing then the cost + // is one loop through the flusher. + int ops = SelectionKey.OP_READ; + + // Now mask the preferred ops with the mask of the current session + int mask = session.getTrafficMask().getInterestOps(); + synchronized (readLock) + { + key.interestOps(ops & mask); + } + //Change key to the WriteSelection Key + key = session.getWriteSelectionKey(); + if (key != null && key.isValid()) + { + Queue writeRequestQueue = session.getWriteRequestQueue(); + synchronized (writeRequestQueue) + { + if (!writeRequestQueue.isEmpty()) + { + ops = SelectionKey.OP_WRITE; + synchronized (writeLock) + { + key.interestOps(ops & mask); + } + } + } + } + } + } + finally + { + trafficMaskUpdateLock.unlock(); + } + + } + + private class WriteWorker implements Runnable + { + + public void run() + { + Thread.currentThread().setName(MultiThreadSocketIoProcessor.this.threadName + "Writer"); + + //System.out.println("WriteDebug:"+"Startup"); + for (; ;) + { + try + { + int nKeys = writeSelector.select(SELECTOR_TIMEOUT); + + doAddNewWrite(); + doUpdateTrafficMask(); + + if (nKeys > 0) + { + //System.out.println("WriteDebug:"+nKeys + " keys from writeselector"); + processWrite(writeSelector.selectedKeys()); + } + else + { + //System.out.println("WriteDebug:"+"No keys from writeselector"); + } + + doRemove(); + notifyWriteIdleness(); + + if (flushingSessionsSet.size() > 0) + { + doFlush(); + } + + if (writeSelector.keys().isEmpty()) + { + synchronized (writeLock) + { + + if (writeSelector.keys().isEmpty() && newSessions.isEmpty()) + { + writeWorker = null; + try + { + writeSelector.close(); + } + catch (IOException e) + { + ExceptionMonitor.getInstance().exceptionCaught(e); + } + finally + { + writeSelector = null; + } + + break; + } + } + } + + } + catch (Throwable t) + { + ExceptionMonitor.getInstance().exceptionCaught(t); + + try + { + Thread.sleep(1000); + } + catch (InterruptedException e1) + { + ExceptionMonitor.getInstance().exceptionCaught(e1); + } + } + } + //System.out.println("WriteDebug:"+"Shutdown"); + } + + } + + private class ReadWorker implements Runnable + { + + public void run() + { + Thread.currentThread().setName(MultiThreadSocketIoProcessor.this.threadName + "Reader"); + + //System.out.println("ReadDebug:"+"Startup"); + for (; ;) + { + try + { + int nKeys = selector.select(SELECTOR_TIMEOUT); + + doAddNewReader(); + doUpdateTrafficMask(); + + if (nKeys > 0) + { + //System.out.println("ReadDebug:"+nKeys + " keys from selector"); + + processRead(selector.selectedKeys()); + } + else + { + //System.out.println("ReadDebug:"+"No keys from selector"); + } + + + doRemove(); + notifyReadIdleness(); + + if (selector.keys().isEmpty()) + { + + synchronized (readLock) + { + if (selector.keys().isEmpty() && newSessions.isEmpty()) + { + readWorker = null; + try + { + selector.close(); + } + catch (IOException e) + { + ExceptionMonitor.getInstance().exceptionCaught(e); + } + finally + { + selector = null; + } + + break; + } + } + } + } + catch (Throwable t) + { + ExceptionMonitor.getInstance().exceptionCaught(t); + + try + { + Thread.sleep(1000); + } + catch (InterruptedException e1) + { + ExceptionMonitor.getInstance().exceptionCaught(e1); + } + } + } + //System.out.println("ReadDebug:"+"Shutdown"); + } + + } +} |