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/* |
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Copyright @ 1999-2003, The Institute for Genomic Research (TIGR). |
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All rights reserved. |
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*/ |
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/* |
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* $RCSfile: MEVPollAcceptStrategy.java,v $ |
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* $Revision: 1.4 $ |
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* $Date: 2005/03/10 15:34:10 $ |
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* $Author: braistedj $ |
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*/ |
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package org.tigr.remote.gateway; |
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|
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import java.io.BufferedInputStream; |
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import java.io.BufferedOutputStream; |
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import java.io.IOException; |
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import java.io.PrintWriter; |
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|
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import javax.servlet.http.HttpServletRequest; |
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import javax.servlet.http.HttpServletResponse; |
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|
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import org.tigr.util.ConfMap; |
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|
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class MEVPollAcceptStrategy { |
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|
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/** |
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* Construct a <code>MEVPollAcceptStrategy</code> with specified session. |
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*/ |
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public MEVPollAcceptStrategy( SessionState session, ConfMap cfg ) { |
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m_session = session; |
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} |
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|
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/** |
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* Accepts a polling request. |
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*/ |
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public void acceptPollRequest( HttpServletRequest req, HttpServletResponse resp ) throws IOException { |
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if (!m_session.isLocked()) { // no PVM waiting for this poll |
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PrintWriter p = new PrintWriter( resp.getOutputStream() ); |
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if (m_session.getMessageQueue().getSize() > 0) { // message queue is not empty |
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String response = (String)m_session.getMessageQueue().getHead(); |
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p.print( response ); |
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} else { |
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p.println("<response/>"); |
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} |
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p.flush(); |
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p = null; |
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} else { // PVM response arrived |
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// need to clear message queue |
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m_session.getMessageQueue().clear(); |
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synchronized( m_session ) { |
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m_session.connect(); |
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m_session.notify(); |
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} |
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m_session.releaseMonitor(); |
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BufferedInputStream in = new BufferedInputStream( m_session.getInputPipe() ); |
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BufferedOutputStream out = new BufferedOutputStream( resp.getOutputStream() ); |
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|
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byte[] b = new byte[1024*100]; |
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int cnt; |
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while ((cnt = in.read(b)) >= 0) { |
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out.write(b, 0, cnt); |
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} |
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out.flush(); |
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out = null; |
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in.close(); |
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m_session.getInputPipe().close(); |
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m_session.free(); |
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} |
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} |
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|
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SessionState m_session; |
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} |