/jetty-8.1.5.v20120716/jetty-server/src/main/java/org/eclipse/jetty/server/nio/SelectChannelConnector.java
Java | 329 lines | 202 code | 37 blank | 90 comment | 10 complexity | f1560c1041ad5ae790ec4e28b37de201 MD5 | raw file
Possible License(s): Apache-2.0
- // ========================================================================
- // Copyright (c) 2003-2009 Mort Bay Consulting Pty. Ltd.
- // ------------------------------------------------------------------------
- // All rights reserved. This program and the accompanying materials
- // are made available under the terms of the Eclipse Public License v1.0
- // and Apache License v2.0 which accompanies this distribution.
- // The Eclipse Public License is available at
- // http://www.eclipse.org/legal/epl-v10.html
- // The Apache License v2.0 is available at
- // http://www.opensource.org/licenses/apache2.0.php
- // You may elect to redistribute this code under either of these licenses.
- // ========================================================================
- package org.eclipse.jetty.server.nio;
- import java.io.IOException;
- import java.net.InetSocketAddress;
- import java.net.Socket;
- import java.nio.channels.SelectionKey;
- import java.nio.channels.ServerSocketChannel;
- import java.nio.channels.SocketChannel;
- import org.eclipse.jetty.continuation.Continuation;
- import org.eclipse.jetty.io.AsyncEndPoint;
- import org.eclipse.jetty.io.ConnectedEndPoint;
- import org.eclipse.jetty.io.Connection;
- import org.eclipse.jetty.io.EndPoint;
- import org.eclipse.jetty.io.nio.AsyncConnection;
- import org.eclipse.jetty.io.nio.SelectChannelEndPoint;
- import org.eclipse.jetty.io.nio.SelectorManager;
- import org.eclipse.jetty.io.nio.SelectorManager.SelectSet;
- import org.eclipse.jetty.server.AsyncHttpConnection;
- import org.eclipse.jetty.server.Request;
- import org.eclipse.jetty.util.thread.ThreadPool;
- /* ------------------------------------------------------------------------------- */
- /**
- * Selecting NIO connector.
- * <p>
- * This connector uses efficient NIO buffers with a non blocking threading model. Direct NIO buffers
- * are used and threads are only allocated to connections with requests. Synchronization is used to
- * simulate blocking for the servlet API, and any unflushed content at the end of request handling
- * is written asynchronously.
- * </p>
- * <p>
- * This connector is best used when there are a many connections that have idle periods.
- * </p>
- * <p>
- * When used with {@link org.eclipse.jetty.continuation.Continuation}, threadless waits are supported.
- * If a filter or servlet returns after calling {@link Continuation#suspend()} or when a
- * runtime exception is thrown from a call to {@link Continuation#undispatch()}, Jetty will
- * will not send a response to the client. Instead the thread is released and the Continuation is
- * placed on the timer queue. If the Continuation timeout expires, or it's
- * resume method is called, then the request is again allocated a thread and the request is retried.
- * The limitation of this approach is that request content is not available on the retried request,
- * thus if possible it should be read after the continuation or saved as a request attribute or as the
- * associated object of the Continuation instance.
- * </p>
- *
- * @org.apache.xbean.XBean element="nioConnector" description="Creates an NIO based socket connector"
- */
- public class SelectChannelConnector extends AbstractNIOConnector
- {
- protected ServerSocketChannel _acceptChannel;
- private int _lowResourcesConnections;
- private int _lowResourcesMaxIdleTime;
- private int _localPort=-1;
- private final SelectorManager _manager = new ConnectorSelectorManager();
- /* ------------------------------------------------------------------------------- */
- /**
- * Constructor.
- *
- */
- public SelectChannelConnector()
- {
- _manager.setMaxIdleTime(getMaxIdleTime());
- addBean(_manager,true);
- setAcceptors(Math.max(1,(Runtime.getRuntime().availableProcessors()+3)/4));
- }
-
- @Override
- public void setThreadPool(ThreadPool pool)
- {
- super.setThreadPool(pool);
- // preserve start order
- removeBean(_manager);
- addBean(_manager,true);
- }
-
- /* ------------------------------------------------------------ */
- @Override
- public void accept(int acceptorID) throws IOException
- {
- ServerSocketChannel server;
- synchronized(this)
- {
- server = _acceptChannel;
- }
- if (server!=null && server.isOpen() && _manager.isStarted())
- {
- SocketChannel channel = server.accept();
- channel.configureBlocking(false);
- Socket socket = channel.socket();
- configure(socket);
- _manager.register(channel);
- }
- }
- /* ------------------------------------------------------------ */
- public void close() throws IOException
- {
- synchronized(this)
- {
- if (_acceptChannel != null)
- {
- removeBean(_acceptChannel);
- if (_acceptChannel.isOpen())
- _acceptChannel.close();
- }
- _acceptChannel = null;
- _localPort=-2;
- }
- }
- /* ------------------------------------------------------------------------------- */
- @Override
- public void customize(EndPoint endpoint, Request request) throws IOException
- {
- request.setTimeStamp(System.currentTimeMillis());
- endpoint.setMaxIdleTime(_maxIdleTime);
- super.customize(endpoint, request);
- }
- /* ------------------------------------------------------------------------------- */
- @Override
- public void persist(EndPoint endpoint) throws IOException
- {
- AsyncEndPoint aEndp = ((AsyncEndPoint)endpoint);
- aEndp.setCheckForIdle(true);
- super.persist(endpoint);
- }
- /* ------------------------------------------------------------ */
- public SelectorManager getSelectorManager()
- {
- return _manager;
- }
- /* ------------------------------------------------------------ */
- public synchronized Object getConnection()
- {
- return _acceptChannel;
- }
- /* ------------------------------------------------------------------------------- */
- public int getLocalPort()
- {
- synchronized(this)
- {
- return _localPort;
- }
- }
- /* ------------------------------------------------------------ */
- public void open() throws IOException
- {
- synchronized(this)
- {
- if (_acceptChannel == null)
- {
- // Create a new server socket
- _acceptChannel = ServerSocketChannel.open();
- // Set to blocking mode
- _acceptChannel.configureBlocking(true);
- // Bind the server socket to the local host and port
- _acceptChannel.socket().setReuseAddress(getReuseAddress());
- InetSocketAddress addr = getHost()==null?new InetSocketAddress(getPort()):new InetSocketAddress(getHost(),getPort());
- _acceptChannel.socket().bind(addr,getAcceptQueueSize());
- _localPort=_acceptChannel.socket().getLocalPort();
- if (_localPort<=0)
- throw new IOException("Server channel not bound");
- addBean(_acceptChannel);
- }
- }
- }
- /* ------------------------------------------------------------ */
- @Override
- public void setMaxIdleTime(int maxIdleTime)
- {
- _manager.setMaxIdleTime(maxIdleTime);
- super.setMaxIdleTime(maxIdleTime);
- }
- /* ------------------------------------------------------------ */
- /**
- * @return the lowResourcesConnections
- */
- public int getLowResourcesConnections()
- {
- return _lowResourcesConnections;
- }
- /* ------------------------------------------------------------ */
- /**
- * Set the number of connections, which if exceeded places this manager in low resources state.
- * This is not an exact measure as the connection count is averaged over the select sets.
- * @param lowResourcesConnections the number of connections
- * @see #setLowResourcesMaxIdleTime(int)
- */
- public void setLowResourcesConnections(int lowResourcesConnections)
- {
- _lowResourcesConnections=lowResourcesConnections;
- }
- /* ------------------------------------------------------------ */
- /**
- * @return the lowResourcesMaxIdleTime
- */
- @Override
- public int getLowResourcesMaxIdleTime()
- {
- return _lowResourcesMaxIdleTime;
- }
- /* ------------------------------------------------------------ */
- /**
- * Set the period in ms that a connection is allowed to be idle when this there are more
- * than {@link #getLowResourcesConnections()} connections. This allows the server to rapidly close idle connections
- * in order to gracefully handle high load situations.
- * @param lowResourcesMaxIdleTime the period in ms that a connection is allowed to be idle when resources are low.
- * @see #setMaxIdleTime(int)
- */
- @Override
- public void setLowResourcesMaxIdleTime(int lowResourcesMaxIdleTime)
- {
- _lowResourcesMaxIdleTime=lowResourcesMaxIdleTime;
- super.setLowResourcesMaxIdleTime(lowResourcesMaxIdleTime);
- }
- /* ------------------------------------------------------------ */
- /*
- * @see org.eclipse.jetty.server.server.AbstractConnector#doStart()
- */
- @Override
- protected void doStart() throws Exception
- {
- _manager.setSelectSets(getAcceptors());
- _manager.setMaxIdleTime(getMaxIdleTime());
- _manager.setLowResourcesConnections(getLowResourcesConnections());
- _manager.setLowResourcesMaxIdleTime(getLowResourcesMaxIdleTime());
- super.doStart();
- }
- /* ------------------------------------------------------------ */
- protected SelectChannelEndPoint newEndPoint(SocketChannel channel, SelectSet selectSet, SelectionKey key) throws IOException
- {
- SelectChannelEndPoint endp= new SelectChannelEndPoint(channel,selectSet,key, SelectChannelConnector.this._maxIdleTime);
- endp.setConnection(selectSet.getManager().newConnection(channel,endp, key.attachment()));
- return endp;
- }
- /* ------------------------------------------------------------------------------- */
- protected void endPointClosed(SelectChannelEndPoint endpoint)
- {
- connectionClosed(endpoint.getConnection());
- }
- /* ------------------------------------------------------------------------------- */
- protected AsyncConnection newConnection(SocketChannel channel,final AsyncEndPoint endpoint)
- {
- return new AsyncHttpConnection(SelectChannelConnector.this,endpoint,getServer());
- }
- /* ------------------------------------------------------------ */
- /* ------------------------------------------------------------ */
- /* ------------------------------------------------------------ */
- private final class ConnectorSelectorManager extends SelectorManager
- {
- @Override
- public boolean dispatch(Runnable task)
- {
- ThreadPool pool=getThreadPool();
- if (pool==null)
- pool=getServer().getThreadPool();
- return pool.dispatch(task);
- }
- @Override
- protected void endPointClosed(final SelectChannelEndPoint endpoint)
- {
- SelectChannelConnector.this.endPointClosed(endpoint);
- }
- @Override
- protected void endPointOpened(SelectChannelEndPoint endpoint)
- {
- // TODO handle max connections and low resources
- connectionOpened(endpoint.getConnection());
- }
- @Override
- protected void endPointUpgraded(ConnectedEndPoint endpoint, Connection oldConnection)
- {
- connectionUpgraded(oldConnection,endpoint.getConnection());
- }
- @Override
- public AsyncConnection newConnection(SocketChannel channel,AsyncEndPoint endpoint, Object attachment)
- {
- return SelectChannelConnector.this.newConnection(channel,endpoint);
- }
- @Override
- protected SelectChannelEndPoint newEndPoint(SocketChannel channel, SelectSet selectSet, SelectionKey sKey) throws IOException
- {
- return SelectChannelConnector.this.newEndPoint(channel,selectSet,sKey);
- }
- }
- }