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view src/org/eclipse/jetty/server/AsyncHttpConnection.java @ 895:49ff91097d6c
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author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Thu, 06 Oct 2016 23:43:36 -0600 |
parents | 8e9db0bbf4f9 |
children | 3268ddf919d4 |
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// // ======================================================================== // Copyright (c) 1995-2014 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; import java.io.IOException; import org.eclipse.jetty.http.HttpException; import org.eclipse.jetty.http.HttpStatus; import org.eclipse.jetty.io.AsyncEndPoint; 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.slf4j.Logger; import org.slf4j.LoggerFactory; /* ------------------------------------------------------------ */ /** Asychronous Server HTTP connection * */ public class AsyncHttpConnection extends AbstractHttpConnection implements AsyncConnection { private final static int NO_PROGRESS_INFO = Integer.getInteger("org.mortbay.jetty.NO_PROGRESS_INFO",100); private final static int NO_PROGRESS_CLOSE = Integer.getInteger("org.mortbay.jetty.NO_PROGRESS_CLOSE",200); private static final Logger LOG = LoggerFactory.getLogger(AsyncHttpConnection.class); private int _total_no_progress; private final AsyncEndPoint _asyncEndp; private boolean _readInterested = true; public AsyncHttpConnection(Connector connector, EndPoint endpoint, Server server) { super(connector,endpoint,server); _asyncEndp=(AsyncEndPoint)endpoint; } @Override public Connection handle() throws IOException { Connection connection = this; boolean some_progress=false; boolean progress=true; try { setCurrentConnection(this); // don't check for idle while dispatched (unless blocking IO is done). _asyncEndp.setCheckForIdle(false); // While progress and the connection has not changed while (progress && connection==this) { progress=false; try { // Handle resumed request if (_request._async.isAsync()) { if (_request._async.isDispatchable()) handleRequest(); } // else Parse more input else if (!_parser.isComplete() && _parser.parseAvailable()) progress=true; // Generate more output if (_generator.isCommitted() && !_generator.isComplete() && !_endp.isOutputShutdown() && !_request.getAsyncContinuation().isAsyncStarted()) if (_generator.flushBuffer()>0) progress=true; // Flush output _endp.flush(); // Has any IO been done by the endpoint itself since last loop if (_asyncEndp.hasProgressed()) progress=true; } catch (HttpException e) { if (LOG.isDebugEnabled()) { LOG.debug("uri="+_uri); LOG.debug("fields="+_requestFields); LOG.debug("",e); } progress=true; _generator.sendError(e.getStatus(), e.getReason(), null, true); } finally { some_progress|=progress; // Is this request/response round complete and are fully flushed? boolean parserComplete = _parser.isComplete(); boolean generatorComplete = _generator.isComplete(); boolean complete = parserComplete && generatorComplete; if (parserComplete) { if (generatorComplete) { // Reset the parser/generator progress=true; // look for a switched connection instance? if (_response.getStatus()==HttpStatus.SWITCHING_PROTOCOLS_101) { Connection switched=(Connection)_request.getAttribute("org.eclipse.jetty.io.Connection"); if (switched!=null) connection=switched; } reset(); // TODO Is this still required? if (!_generator.isPersistent() && !_endp.isOutputShutdown()) { LOG.warn("Safety net oshut!!! IF YOU SEE THIS, PLEASE RAISE BUGZILLA"); _endp.shutdownOutput(); } } else { // We have finished parsing, but not generating so // we must not be interested in reading until we // have finished generating and we reset the generator _readInterested = false; LOG.debug("Disabled read interest while writing response {}", _endp); } } if (!complete && _request.getAsyncContinuation().isAsyncStarted()) { // The request is suspended, so even though progress has been made, // exit the while loop by setting progress to false LOG.debug("suspended {}",this); progress=false; } } } } finally { setCurrentConnection(null); // If we are not suspended if (!_request.getAsyncContinuation().isAsyncStarted()) { // return buffers _parser.returnBuffers(); _generator.returnBuffers(); // reenable idle checking unless request is suspended _asyncEndp.setCheckForIdle(true); } // Safety net to catch spinning if (some_progress) _total_no_progress=0; else { _total_no_progress++; if (NO_PROGRESS_INFO>0 && _total_no_progress%NO_PROGRESS_INFO==0 && (NO_PROGRESS_CLOSE<=0 || _total_no_progress< NO_PROGRESS_CLOSE)) LOG.info("EndPoint making no progress: "+_total_no_progress+" "+_endp+" "+this); if (NO_PROGRESS_CLOSE>0 && _total_no_progress==NO_PROGRESS_CLOSE) { LOG.warn("Closing EndPoint making no progress: "+_total_no_progress+" "+_endp+" "+this); if (_endp instanceof SelectChannelEndPoint) ((SelectChannelEndPoint)_endp).getChannel().close(); } } } return connection; } public void onInputShutdown() throws IOException { // If we don't have a committed response and we are not suspended if (_generator.isIdle() && !_request.getAsyncContinuation().isSuspended()) { // then no more can happen, so close. _endp.close(); } // Make idle parser seek EOF if (_parser.isIdle()) _parser.setPersistent(false); } @Override public void reset() { _readInterested = true; LOG.debug("Enabled read interest {}", _endp); super.reset(); } @Override public boolean isSuspended() { return !_readInterested || super.isSuspended(); } }